kvm-s390.c 102.6 KB
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// SPDX-License-Identifier: GPL-2.0
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/*
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 * hosting IBM Z kernel virtual machines (s390x)
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 *
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 * Copyright IBM Corp. 2008, 2017
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 *
 *    Author(s): Carsten Otte <cotte@de.ibm.com>
 *               Christian Borntraeger <borntraeger@de.ibm.com>
 *               Heiko Carstens <heiko.carstens@de.ibm.com>
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 *               Christian Ehrhardt <ehrhardt@de.ibm.com>
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 *               Jason J. Herne <jjherne@us.ibm.com>
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 */

#include <linux/compiler.h>
#include <linux/err.h>
#include <linux/fs.h>
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#include <linux/hrtimer.h>
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#include <linux/init.h>
#include <linux/kvm.h>
#include <linux/kvm_host.h>
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#include <linux/mman.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <linux/timer.h>
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#include <linux/vmalloc.h>
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#include <linux/bitmap.h>
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#include <linux/sched/signal.h>
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#include <linux/string.h>
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#include <asm/asm-offsets.h>
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#include <asm/lowcore.h>
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#include <asm/stp.h>
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#include <asm/pgtable.h>
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#include <asm/gmap.h>
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#include <asm/nmi.h>
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#include <asm/switch_to.h>
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#include <asm/isc.h>
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#include <asm/sclp.h>
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#include <asm/cpacf.h>
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#include <asm/timex.h>
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#include "kvm-s390.h"
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#include "gaccess.h"

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#define KMSG_COMPONENT "kvm-s390"
#undef pr_fmt
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

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#define CREATE_TRACE_POINTS
#include "trace.h"
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#include "trace-s390.h"
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#define MEM_OP_MAX_SIZE 65536	/* Maximum transfer size for KVM_S390_MEM_OP */
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#define LOCAL_IRQS 32
#define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
			   (KVM_MAX_VCPUS + LOCAL_IRQS))
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#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU

struct kvm_stats_debugfs_item debugfs_entries[] = {
	{ "userspace_handled", VCPU_STAT(exit_userspace) },
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	{ "exit_null", VCPU_STAT(exit_null) },
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	{ "exit_validity", VCPU_STAT(exit_validity) },
	{ "exit_stop_request", VCPU_STAT(exit_stop_request) },
	{ "exit_external_request", VCPU_STAT(exit_external_request) },
	{ "exit_external_interrupt", VCPU_STAT(exit_external_interrupt) },
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	{ "exit_instruction", VCPU_STAT(exit_instruction) },
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	{ "exit_pei", VCPU_STAT(exit_pei) },
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	{ "exit_program_interruption", VCPU_STAT(exit_program_interruption) },
	{ "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) },
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	{ "exit_operation_exception", VCPU_STAT(exit_operation_exception) },
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	{ "halt_successful_poll", VCPU_STAT(halt_successful_poll) },
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	{ "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) },
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	{ "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) },
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	{ "halt_wakeup", VCPU_STAT(halt_wakeup) },
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	{ "instruction_lctlg", VCPU_STAT(instruction_lctlg) },
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	{ "instruction_lctl", VCPU_STAT(instruction_lctl) },
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	{ "instruction_stctl", VCPU_STAT(instruction_stctl) },
	{ "instruction_stctg", VCPU_STAT(instruction_stctg) },
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	{ "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) },
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	{ "deliver_external_call", VCPU_STAT(deliver_external_call) },
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	{ "deliver_service_signal", VCPU_STAT(deliver_service_signal) },
	{ "deliver_virtio_interrupt", VCPU_STAT(deliver_virtio_interrupt) },
	{ "deliver_stop_signal", VCPU_STAT(deliver_stop_signal) },
	{ "deliver_prefix_signal", VCPU_STAT(deliver_prefix_signal) },
	{ "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) },
	{ "deliver_program_interruption", VCPU_STAT(deliver_program_int) },
	{ "exit_wait_state", VCPU_STAT(exit_wait_state) },
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	{ "instruction_pfmf", VCPU_STAT(instruction_pfmf) },
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	{ "instruction_stidp", VCPU_STAT(instruction_stidp) },
	{ "instruction_spx", VCPU_STAT(instruction_spx) },
	{ "instruction_stpx", VCPU_STAT(instruction_stpx) },
	{ "instruction_stap", VCPU_STAT(instruction_stap) },
	{ "instruction_storage_key", VCPU_STAT(instruction_storage_key) },
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	{ "instruction_ipte_interlock", VCPU_STAT(instruction_ipte_interlock) },
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	{ "instruction_stsch", VCPU_STAT(instruction_stsch) },
	{ "instruction_chsc", VCPU_STAT(instruction_chsc) },
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	{ "instruction_essa", VCPU_STAT(instruction_essa) },
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	{ "instruction_stsi", VCPU_STAT(instruction_stsi) },
	{ "instruction_stfl", VCPU_STAT(instruction_stfl) },
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	{ "instruction_tprot", VCPU_STAT(instruction_tprot) },
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	{ "instruction_sthyi", VCPU_STAT(instruction_sthyi) },
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	{ "instruction_sie", VCPU_STAT(instruction_sie) },
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	{ "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) },
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	{ "instruction_sigp_sense_running", VCPU_STAT(instruction_sigp_sense_running) },
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	{ "instruction_sigp_external_call", VCPU_STAT(instruction_sigp_external_call) },
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	{ "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) },
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	{ "instruction_sigp_cond_emergency", VCPU_STAT(instruction_sigp_cond_emergency) },
	{ "instruction_sigp_start", VCPU_STAT(instruction_sigp_start) },
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	{ "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) },
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	{ "instruction_sigp_stop_store_status", VCPU_STAT(instruction_sigp_stop_store_status) },
	{ "instruction_sigp_store_status", VCPU_STAT(instruction_sigp_store_status) },
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	{ "instruction_sigp_store_adtl_status", VCPU_STAT(instruction_sigp_store_adtl_status) },
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	{ "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) },
	{ "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) },
	{ "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) },
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	{ "instruction_sigp_cpu_reset", VCPU_STAT(instruction_sigp_cpu_reset) },
	{ "instruction_sigp_init_cpu_reset", VCPU_STAT(instruction_sigp_init_cpu_reset) },
	{ "instruction_sigp_unknown", VCPU_STAT(instruction_sigp_unknown) },
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	{ "diagnose_10", VCPU_STAT(diagnose_10) },
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	{ "diagnose_44", VCPU_STAT(diagnose_44) },
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	{ "diagnose_9c", VCPU_STAT(diagnose_9c) },
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	{ "diagnose_258", VCPU_STAT(diagnose_258) },
	{ "diagnose_308", VCPU_STAT(diagnose_308) },
	{ "diagnose_500", VCPU_STAT(diagnose_500) },
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	{ NULL }
};

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struct kvm_s390_tod_clock_ext {
	__u8 epoch_idx;
	__u64 tod;
	__u8 reserved[7];
} __packed;

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/* allow nested virtualization in KVM (if enabled by user space) */
static int nested;
module_param(nested, int, S_IRUGO);
MODULE_PARM_DESC(nested, "Nested virtualization support");

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/* upper facilities limit for kvm */
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unsigned long kvm_s390_fac_list_mask[16] = { FACILITIES_KVM };
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unsigned long kvm_s390_fac_list_mask_size(void)
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{
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	BUILD_BUG_ON(ARRAY_SIZE(kvm_s390_fac_list_mask) > S390_ARCH_FAC_MASK_SIZE_U64);
	return ARRAY_SIZE(kvm_s390_fac_list_mask);
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}

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/* available cpu features supported by kvm */
static DECLARE_BITMAP(kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
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/* available subfunctions indicated via query / "test bit" */
static struct kvm_s390_vm_cpu_subfunc kvm_s390_available_subfunc;
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static struct gmap_notifier gmap_notifier;
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static struct gmap_notifier vsie_gmap_notifier;
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debug_info_t *kvm_s390_dbf;
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/* Section: not file related */
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int kvm_arch_hardware_enable(void)
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{
	/* every s390 is virtualization enabled ;-) */
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	return 0;
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}

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static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
			      unsigned long end);
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/*
 * This callback is executed during stop_machine(). All CPUs are therefore
 * temporarily stopped. In order not to change guest behavior, we have to
 * disable preemption whenever we touch the epoch of kvm and the VCPUs,
 * so a CPU won't be stopped while calculating with the epoch.
 */
static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val,
			  void *v)
{
	struct kvm *kvm;
	struct kvm_vcpu *vcpu;
	int i;
	unsigned long long *delta = v;

	list_for_each_entry(kvm, &vm_list, vm_list) {
		kvm->arch.epoch -= *delta;
		kvm_for_each_vcpu(i, vcpu, kvm) {
			vcpu->arch.sie_block->epoch -= *delta;
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			if (vcpu->arch.cputm_enabled)
				vcpu->arch.cputm_start += *delta;
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			if (vcpu->arch.vsie_block)
				vcpu->arch.vsie_block->epoch -= *delta;
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		}
	}
	return NOTIFY_OK;
}

static struct notifier_block kvm_clock_notifier = {
	.notifier_call = kvm_clock_sync,
};

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int kvm_arch_hardware_setup(void)
{
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	gmap_notifier.notifier_call = kvm_gmap_notifier;
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	gmap_register_pte_notifier(&gmap_notifier);
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	vsie_gmap_notifier.notifier_call = kvm_s390_vsie_gmap_notifier;
	gmap_register_pte_notifier(&vsie_gmap_notifier);
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	atomic_notifier_chain_register(&s390_epoch_delta_notifier,
				       &kvm_clock_notifier);
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	return 0;
}

void kvm_arch_hardware_unsetup(void)
{
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	gmap_unregister_pte_notifier(&gmap_notifier);
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	gmap_unregister_pte_notifier(&vsie_gmap_notifier);
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	atomic_notifier_chain_unregister(&s390_epoch_delta_notifier,
					 &kvm_clock_notifier);
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}

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static void allow_cpu_feat(unsigned long nr)
{
	set_bit_inv(nr, kvm_s390_available_cpu_feat);
}

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static inline int plo_test_bit(unsigned char nr)
{
	register unsigned long r0 asm("0") = (unsigned long) nr | 0x100;
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	int cc;
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	asm volatile(
		/* Parameter registers are ignored for "test bit" */
		"	plo	0,0,0,0(0)\n"
		"	ipm	%0\n"
		"	srl	%0,28\n"
		: "=d" (cc)
		: "d" (r0)
		: "cc");
	return cc == 0;
}

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static void kvm_s390_cpu_feat_init(void)
{
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	int i;

	for (i = 0; i < 256; ++i) {
		if (plo_test_bit(i))
			kvm_s390_available_subfunc.plo[i >> 3] |= 0x80 >> (i & 7);
	}

	if (test_facility(28)) /* TOD-clock steering */
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		ptff(kvm_s390_available_subfunc.ptff,
		     sizeof(kvm_s390_available_subfunc.ptff),
		     PTFF_QAF);
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	if (test_facility(17)) { /* MSA */
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		__cpacf_query(CPACF_KMAC, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kmac);
		__cpacf_query(CPACF_KMC, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kmc);
		__cpacf_query(CPACF_KM, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.km);
		__cpacf_query(CPACF_KIMD, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kimd);
		__cpacf_query(CPACF_KLMD, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.klmd);
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	}
	if (test_facility(76)) /* MSA3 */
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		__cpacf_query(CPACF_PCKMO, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.pckmo);
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	if (test_facility(77)) { /* MSA4 */
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		__cpacf_query(CPACF_KMCTR, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kmctr);
		__cpacf_query(CPACF_KMF, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kmf);
		__cpacf_query(CPACF_KMO, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kmo);
		__cpacf_query(CPACF_PCC, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.pcc);
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	}
	if (test_facility(57)) /* MSA5 */
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		__cpacf_query(CPACF_PRNO, (cpacf_mask_t *)
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			      kvm_s390_available_subfunc.ppno);
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	if (test_facility(146)) /* MSA8 */
		__cpacf_query(CPACF_KMA, (cpacf_mask_t *)
			      kvm_s390_available_subfunc.kma);

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	if (MACHINE_HAS_ESOP)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP);
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	/*
	 * We need SIE support, ESOP (PROT_READ protection for gmap_shadow),
	 * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing).
	 */
	if (!sclp.has_sief2 || !MACHINE_HAS_ESOP || !sclp.has_64bscao ||
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	    !test_facility(3) || !nested)
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		return;
	allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2);
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	if (sclp.has_64bscao)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO);
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	if (sclp.has_siif)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF);
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	if (sclp.has_gpere)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE);
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	if (sclp.has_gsls)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS);
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	if (sclp.has_ib)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB);
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	if (sclp.has_cei)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI);
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	if (sclp.has_ibs)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS);
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	if (sclp.has_kss)
		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_KSS);
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	/*
	 * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make
	 * all skey handling functions read/set the skey from the PGSTE
	 * instead of the real storage key.
	 *
	 * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make
	 * pages being detected as preserved although they are resident.
	 *
	 * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will
	 * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY.
	 *
	 * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and
	 * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be
	 * correctly shadowed. We can do that for the PGSTE but not for PTE.I.
	 *
	 * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We
	 * cannot easily shadow the SCA because of the ipte lock.
	 */
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}

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int kvm_arch_init(void *opaque)
{
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	kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long));
	if (!kvm_s390_dbf)
		return -ENOMEM;

	if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view)) {
		debug_unregister(kvm_s390_dbf);
		return -ENOMEM;
	}

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	kvm_s390_cpu_feat_init();

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	/* Register floating interrupt controller interface. */
	return kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC);
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}

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void kvm_arch_exit(void)
{
	debug_unregister(kvm_s390_dbf);
}

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/* Section: device related */
long kvm_arch_dev_ioctl(struct file *filp,
			unsigned int ioctl, unsigned long arg)
{
	if (ioctl == KVM_S390_ENABLE_SIE)
		return s390_enable_sie();
	return -EINVAL;
}

364
int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
365
{
366 367
	int r;

368
	switch (ext) {
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	case KVM_CAP_S390_PSW:
370
	case KVM_CAP_S390_GMAP:
371
	case KVM_CAP_SYNC_MMU:
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#ifdef CONFIG_KVM_S390_UCONTROL
	case KVM_CAP_S390_UCONTROL:
#endif
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	case KVM_CAP_ASYNC_PF:
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	case KVM_CAP_SYNC_REGS:
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	case KVM_CAP_ONE_REG:
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	case KVM_CAP_ENABLE_CAP:
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	case KVM_CAP_S390_CSS_SUPPORT:
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Cornelia Huck 已提交
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	case KVM_CAP_IOEVENTFD:
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	case KVM_CAP_DEVICE_CTRL:
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	case KVM_CAP_ENABLE_CAP_VM:
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	case KVM_CAP_S390_IRQCHIP:
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	case KVM_CAP_VM_ATTRIBUTES:
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	case KVM_CAP_MP_STATE:
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	case KVM_CAP_IMMEDIATE_EXIT:
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	case KVM_CAP_S390_INJECT_IRQ:
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	case KVM_CAP_S390_USER_SIGP:
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	case KVM_CAP_S390_USER_STSI:
390
	case KVM_CAP_S390_SKEYS:
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	case KVM_CAP_S390_IRQ_STATE:
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	case KVM_CAP_S390_USER_INSTR0:
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	case KVM_CAP_S390_CMMA_MIGRATION:
394
	case KVM_CAP_S390_AIS:
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	case KVM_CAP_S390_AIS_MIGRATION:
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		r = 1;
		break;
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	case KVM_CAP_S390_MEM_OP:
		r = MEM_OP_MAX_SIZE;
		break;
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	case KVM_CAP_NR_VCPUS:
	case KVM_CAP_MAX_VCPUS:
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		r = KVM_S390_BSCA_CPU_SLOTS;
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		if (!kvm_s390_use_sca_entries())
			r = KVM_MAX_VCPUS;
		else if (sclp.has_esca && sclp.has_64bscao)
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			r = KVM_S390_ESCA_CPU_SLOTS;
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		break;
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	case KVM_CAP_NR_MEMSLOTS:
		r = KVM_USER_MEM_SLOTS;
		break;
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	case KVM_CAP_S390_COW:
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		r = MACHINE_HAS_ESOP;
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		break;
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	case KVM_CAP_S390_VECTOR_REGISTERS:
		r = MACHINE_HAS_VX;
		break;
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	case KVM_CAP_S390_RI:
		r = test_facility(64);
		break;
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	case KVM_CAP_S390_GS:
		r = test_facility(133);
		break;
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	default:
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		r = 0;
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	}
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	return r;
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}

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static void kvm_s390_sync_dirty_log(struct kvm *kvm,
					struct kvm_memory_slot *memslot)
{
	gfn_t cur_gfn, last_gfn;
	unsigned long address;
	struct gmap *gmap = kvm->arch.gmap;

	/* Loop over all guest pages */
	last_gfn = memslot->base_gfn + memslot->npages;
	for (cur_gfn = memslot->base_gfn; cur_gfn <= last_gfn; cur_gfn++) {
		address = gfn_to_hva_memslot(memslot, cur_gfn);

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		if (test_and_clear_guest_dirty(gmap->mm, address))
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			mark_page_dirty(kvm, cur_gfn);
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		if (fatal_signal_pending(current))
			return;
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		cond_resched();
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	}
}

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/* Section: vm related */
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static void sca_del_vcpu(struct kvm_vcpu *vcpu);

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/*
 * Get (and clear) the dirty memory log for a memory slot.
 */
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
			       struct kvm_dirty_log *log)
{
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	int r;
	unsigned long n;
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	struct kvm_memslots *slots;
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	struct kvm_memory_slot *memslot;
	int is_dirty = 0;

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	if (kvm_is_ucontrol(kvm))
		return -EINVAL;

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	mutex_lock(&kvm->slots_lock);

	r = -EINVAL;
	if (log->slot >= KVM_USER_MEM_SLOTS)
		goto out;

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	slots = kvm_memslots(kvm);
	memslot = id_to_memslot(slots, log->slot);
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	r = -ENOENT;
	if (!memslot->dirty_bitmap)
		goto out;

	kvm_s390_sync_dirty_log(kvm, memslot);
	r = kvm_get_dirty_log(kvm, log, &is_dirty);
	if (r)
		goto out;

	/* Clear the dirty log */
	if (is_dirty) {
		n = kvm_dirty_bitmap_bytes(memslot);
		memset(memslot->dirty_bitmap, 0, n);
	}
	r = 0;
out:
	mutex_unlock(&kvm->slots_lock);
	return r;
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}

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static void icpt_operexc_on_all_vcpus(struct kvm *kvm)
{
	unsigned int i;
	struct kvm_vcpu *vcpu;

	kvm_for_each_vcpu(i, vcpu, kvm) {
		kvm_s390_sync_request(KVM_REQ_ICPT_OPEREXC, vcpu);
	}
}

506 507 508 509 510 511 512 513
static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
{
	int r;

	if (cap->flags)
		return -EINVAL;

	switch (cap->cap) {
514
	case KVM_CAP_S390_IRQCHIP:
515
		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP");
516 517 518
		kvm->arch.use_irqchip = 1;
		r = 0;
		break;
519
	case KVM_CAP_S390_USER_SIGP:
520
		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP");
521 522 523
		kvm->arch.user_sigp = 1;
		r = 0;
		break;
524
	case KVM_CAP_S390_VECTOR_REGISTERS:
525
		mutex_lock(&kvm->lock);
526
		if (kvm->created_vcpus) {
527 528
			r = -EBUSY;
		} else if (MACHINE_HAS_VX) {
529 530
			set_kvm_facility(kvm->arch.model.fac_mask, 129);
			set_kvm_facility(kvm->arch.model.fac_list, 129);
531 532 533 534
			if (test_facility(134)) {
				set_kvm_facility(kvm->arch.model.fac_mask, 134);
				set_kvm_facility(kvm->arch.model.fac_list, 134);
			}
535 536 537 538
			if (test_facility(135)) {
				set_kvm_facility(kvm->arch.model.fac_mask, 135);
				set_kvm_facility(kvm->arch.model.fac_list, 135);
			}
539 540 541
			r = 0;
		} else
			r = -EINVAL;
542
		mutex_unlock(&kvm->lock);
543 544
		VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s",
			 r ? "(not available)" : "(success)");
545
		break;
546 547 548
	case KVM_CAP_S390_RI:
		r = -EINVAL;
		mutex_lock(&kvm->lock);
549
		if (kvm->created_vcpus) {
550 551
			r = -EBUSY;
		} else if (test_facility(64)) {
552 553
			set_kvm_facility(kvm->arch.model.fac_mask, 64);
			set_kvm_facility(kvm->arch.model.fac_list, 64);
554 555 556 557 558 559
			r = 0;
		}
		mutex_unlock(&kvm->lock);
		VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s",
			 r ? "(not available)" : "(success)");
		break;
560 561 562 563 564 565 566 567 568 569 570 571 572
	case KVM_CAP_S390_AIS:
		mutex_lock(&kvm->lock);
		if (kvm->created_vcpus) {
			r = -EBUSY;
		} else {
			set_kvm_facility(kvm->arch.model.fac_mask, 72);
			set_kvm_facility(kvm->arch.model.fac_list, 72);
			r = 0;
		}
		mutex_unlock(&kvm->lock);
		VM_EVENT(kvm, 3, "ENABLE: AIS %s",
			 r ? "(not available)" : "(success)");
		break;
F
Fan Zhang 已提交
573 574 575 576 577 578 579 580 581 582 583 584 585 586
	case KVM_CAP_S390_GS:
		r = -EINVAL;
		mutex_lock(&kvm->lock);
		if (atomic_read(&kvm->online_vcpus)) {
			r = -EBUSY;
		} else if (test_facility(133)) {
			set_kvm_facility(kvm->arch.model.fac_mask, 133);
			set_kvm_facility(kvm->arch.model.fac_list, 133);
			r = 0;
		}
		mutex_unlock(&kvm->lock);
		VM_EVENT(kvm, 3, "ENABLE: CAP_S390_GS %s",
			 r ? "(not available)" : "(success)");
		break;
587
	case KVM_CAP_S390_USER_STSI:
588
		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI");
589 590 591
		kvm->arch.user_stsi = 1;
		r = 0;
		break;
592 593 594 595 596 597
	case KVM_CAP_S390_USER_INSTR0:
		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_INSTR0");
		kvm->arch.user_instr0 = 1;
		icpt_operexc_on_all_vcpus(kvm);
		r = 0;
		break;
598 599 600 601 602 603 604
	default:
		r = -EINVAL;
		break;
	}
	return r;
}

605 606 607 608 609 610 611
static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret;

	switch (attr->attr) {
	case KVM_S390_VM_MEM_LIMIT_SIZE:
		ret = 0;
612
		VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes",
613 614
			 kvm->arch.mem_limit);
		if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr))
615 616 617 618 619 620 621 622 623 624
			ret = -EFAULT;
		break;
	default:
		ret = -ENXIO;
		break;
	}
	return ret;
}

static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
625 626 627 628 629
{
	int ret;
	unsigned int idx;
	switch (attr->attr) {
	case KVM_S390_VM_MEM_ENABLE_CMMA:
630
		ret = -ENXIO;
631
		if (!sclp.has_cmma)
632 633
			break;

634
		ret = -EBUSY;
635
		VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support");
636
		mutex_lock(&kvm->lock);
637
		if (!kvm->created_vcpus) {
638 639 640 641 642 643
			kvm->arch.use_cmma = 1;
			ret = 0;
		}
		mutex_unlock(&kvm->lock);
		break;
	case KVM_S390_VM_MEM_CLR_CMMA:
644 645 646
		ret = -ENXIO;
		if (!sclp.has_cmma)
			break;
647 648 649 650
		ret = -EINVAL;
		if (!kvm->arch.use_cmma)
			break;

651
		VM_EVENT(kvm, 3, "%s", "RESET: CMMA states");
652 653
		mutex_lock(&kvm->lock);
		idx = srcu_read_lock(&kvm->srcu);
654
		s390_reset_cmma(kvm->arch.gmap->mm);
655 656 657 658
		srcu_read_unlock(&kvm->srcu, idx);
		mutex_unlock(&kvm->lock);
		ret = 0;
		break;
659 660 661 662 663 664 665 666 667
	case KVM_S390_VM_MEM_LIMIT_SIZE: {
		unsigned long new_limit;

		if (kvm_is_ucontrol(kvm))
			return -EINVAL;

		if (get_user(new_limit, (u64 __user *)attr->addr))
			return -EFAULT;

668 669
		if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT &&
		    new_limit > kvm->arch.mem_limit)
670 671
			return -E2BIG;

672 673 674
		if (!new_limit)
			return -EINVAL;

675
		/* gmap_create takes last usable address */
676 677 678
		if (new_limit != KVM_S390_NO_MEM_LIMIT)
			new_limit -= 1;

679 680
		ret = -EBUSY;
		mutex_lock(&kvm->lock);
681
		if (!kvm->created_vcpus) {
682 683
			/* gmap_create will round the limit up */
			struct gmap *new = gmap_create(current->mm, new_limit);
684 685 686 687

			if (!new) {
				ret = -ENOMEM;
			} else {
688
				gmap_remove(kvm->arch.gmap);
689 690 691 692 693 694
				new->private = kvm;
				kvm->arch.gmap = new;
				ret = 0;
			}
		}
		mutex_unlock(&kvm->lock);
695 696 697
		VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit);
		VM_EVENT(kvm, 3, "New guest asce: 0x%pK",
			 (void *) kvm->arch.gmap->asce);
698 699
		break;
	}
700 701 702 703 704 705 706
	default:
		ret = -ENXIO;
		break;
	}
	return ret;
}

707 708 709 710 711 712 713
static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu);

static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
{
	struct kvm_vcpu *vcpu;
	int i;

714
	if (!test_kvm_facility(kvm, 76))
715 716 717 718 719 720 721 722 723
		return -EINVAL;

	mutex_lock(&kvm->lock);
	switch (attr->attr) {
	case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
		get_random_bytes(
			kvm->arch.crypto.crycb->aes_wrapping_key_mask,
			sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
		kvm->arch.crypto.aes_kw = 1;
724
		VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support");
725 726 727 728 729 730
		break;
	case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
		get_random_bytes(
			kvm->arch.crypto.crycb->dea_wrapping_key_mask,
			sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
		kvm->arch.crypto.dea_kw = 1;
731
		VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support");
732 733 734 735 736
		break;
	case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
		kvm->arch.crypto.aes_kw = 0;
		memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0,
			sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
737
		VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support");
738 739 740 741 742
		break;
	case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
		kvm->arch.crypto.dea_kw = 0;
		memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0,
			sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
743
		VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support");
744 745 746 747 748 749 750 751 752 753 754 755 756 757
		break;
	default:
		mutex_unlock(&kvm->lock);
		return -ENXIO;
	}

	kvm_for_each_vcpu(i, vcpu, kvm) {
		kvm_s390_vcpu_crypto_setup(vcpu);
		exit_sie(vcpu);
	}
	mutex_unlock(&kvm->lock);
	return 0;
}

758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880
static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req)
{
	int cx;
	struct kvm_vcpu *vcpu;

	kvm_for_each_vcpu(cx, vcpu, kvm)
		kvm_s390_sync_request(req, vcpu);
}

/*
 * Must be called with kvm->srcu held to avoid races on memslots, and with
 * kvm->lock to avoid races with ourselves and kvm_s390_vm_stop_migration.
 */
static int kvm_s390_vm_start_migration(struct kvm *kvm)
{
	struct kvm_s390_migration_state *mgs;
	struct kvm_memory_slot *ms;
	/* should be the only one */
	struct kvm_memslots *slots;
	unsigned long ram_pages;
	int slotnr;

	/* migration mode already enabled */
	if (kvm->arch.migration_state)
		return 0;

	slots = kvm_memslots(kvm);
	if (!slots || !slots->used_slots)
		return -EINVAL;

	mgs = kzalloc(sizeof(*mgs), GFP_KERNEL);
	if (!mgs)
		return -ENOMEM;
	kvm->arch.migration_state = mgs;

	if (kvm->arch.use_cmma) {
		/*
		 * Get the last slot. They should be sorted by base_gfn, so the
		 * last slot is also the one at the end of the address space.
		 * We have verified above that at least one slot is present.
		 */
		ms = slots->memslots + slots->used_slots - 1;
		/* round up so we only use full longs */
		ram_pages = roundup(ms->base_gfn + ms->npages, BITS_PER_LONG);
		/* allocate enough bytes to store all the bits */
		mgs->pgste_bitmap = vmalloc(ram_pages / 8);
		if (!mgs->pgste_bitmap) {
			kfree(mgs);
			kvm->arch.migration_state = NULL;
			return -ENOMEM;
		}

		mgs->bitmap_size = ram_pages;
		atomic64_set(&mgs->dirty_pages, ram_pages);
		/* mark all the pages in active slots as dirty */
		for (slotnr = 0; slotnr < slots->used_slots; slotnr++) {
			ms = slots->memslots + slotnr;
			bitmap_set(mgs->pgste_bitmap, ms->base_gfn, ms->npages);
		}

		kvm_s390_sync_request_broadcast(kvm, KVM_REQ_START_MIGRATION);
	}
	return 0;
}

/*
 * Must be called with kvm->lock to avoid races with ourselves and
 * kvm_s390_vm_start_migration.
 */
static int kvm_s390_vm_stop_migration(struct kvm *kvm)
{
	struct kvm_s390_migration_state *mgs;

	/* migration mode already disabled */
	if (!kvm->arch.migration_state)
		return 0;
	mgs = kvm->arch.migration_state;
	kvm->arch.migration_state = NULL;

	if (kvm->arch.use_cmma) {
		kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION);
		vfree(mgs->pgste_bitmap);
	}
	kfree(mgs);
	return 0;
}

static int kvm_s390_vm_set_migration(struct kvm *kvm,
				     struct kvm_device_attr *attr)
{
	int idx, res = -ENXIO;

	mutex_lock(&kvm->lock);
	switch (attr->attr) {
	case KVM_S390_VM_MIGRATION_START:
		idx = srcu_read_lock(&kvm->srcu);
		res = kvm_s390_vm_start_migration(kvm);
		srcu_read_unlock(&kvm->srcu, idx);
		break;
	case KVM_S390_VM_MIGRATION_STOP:
		res = kvm_s390_vm_stop_migration(kvm);
		break;
	default:
		break;
	}
	mutex_unlock(&kvm->lock);

	return res;
}

static int kvm_s390_vm_get_migration(struct kvm *kvm,
				     struct kvm_device_attr *attr)
{
	u64 mig = (kvm->arch.migration_state != NULL);

	if (attr->attr != KVM_S390_VM_MIGRATION_STATUS)
		return -ENXIO;

	if (copy_to_user((void __user *)attr->addr, &mig, sizeof(mig)))
		return -EFAULT;
	return 0;
}

881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900
static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_tod_clock gtod;

	if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
		return -EFAULT;

	if (test_kvm_facility(kvm, 139))
		kvm_s390_set_tod_clock_ext(kvm, &gtod);
	else if (gtod.epoch_idx == 0)
		kvm_s390_set_tod_clock(kvm, gtod.tod);
	else
		return -EINVAL;

	VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx",
		gtod.epoch_idx, gtod.tod);

	return 0;
}

901 902 903 904 905 906 907 908 909 910
static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
{
	u8 gtod_high;

	if (copy_from_user(&gtod_high, (void __user *)attr->addr,
					   sizeof(gtod_high)))
		return -EFAULT;

	if (gtod_high != 0)
		return -EINVAL;
911
	VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high);
912 913 914 915 916 917

	return 0;
}

static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
{
918
	u64 gtod;
919 920 921 922

	if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
		return -EFAULT;

923
	kvm_s390_set_tod_clock(kvm, gtod);
924
	VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod);
925 926 927 928 929 930 931 932 933 934 935
	return 0;
}

static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret;

	if (attr->flags)
		return -EINVAL;

	switch (attr->attr) {
936 937 938
	case KVM_S390_VM_TOD_EXT:
		ret = kvm_s390_set_tod_ext(kvm, attr);
		break;
939 940 941 942 943 944 945 946 947 948 949 950 951
	case KVM_S390_VM_TOD_HIGH:
		ret = kvm_s390_set_tod_high(kvm, attr);
		break;
	case KVM_S390_VM_TOD_LOW:
		ret = kvm_s390_set_tod_low(kvm, attr);
		break;
	default:
		ret = -ENXIO;
		break;
	}
	return ret;
}

952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988
static void kvm_s390_get_tod_clock_ext(struct kvm *kvm,
					struct kvm_s390_vm_tod_clock *gtod)
{
	struct kvm_s390_tod_clock_ext htod;

	preempt_disable();

	get_tod_clock_ext((char *)&htod);

	gtod->tod = htod.tod + kvm->arch.epoch;
	gtod->epoch_idx = htod.epoch_idx + kvm->arch.epdx;

	if (gtod->tod < htod.tod)
		gtod->epoch_idx += 1;

	preempt_enable();
}

static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_tod_clock gtod;

	memset(&gtod, 0, sizeof(gtod));

	if (test_kvm_facility(kvm, 139))
		kvm_s390_get_tod_clock_ext(kvm, &gtod);
	else
		gtod.tod = kvm_s390_get_tod_clock_fast(kvm);

	if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
		return -EFAULT;

	VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x, TOD base: 0x%llx",
		gtod.epoch_idx, gtod.tod);
	return 0;
}

989 990 991 992 993 994 995
static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
{
	u8 gtod_high = 0;

	if (copy_to_user((void __user *)attr->addr, &gtod_high,
					 sizeof(gtod_high)))
		return -EFAULT;
996
	VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high);
997 998 999 1000 1001 1002

	return 0;
}

static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
{
1003
	u64 gtod;
1004

1005
	gtod = kvm_s390_get_tod_clock_fast(kvm);
1006 1007
	if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
		return -EFAULT;
1008
	VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod);
1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020

	return 0;
}

static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret;

	if (attr->flags)
		return -EINVAL;

	switch (attr->attr) {
1021 1022 1023
	case KVM_S390_VM_TOD_EXT:
		ret = kvm_s390_get_tod_ext(kvm, attr);
		break;
1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036
	case KVM_S390_VM_TOD_HIGH:
		ret = kvm_s390_get_tod_high(kvm, attr);
		break;
	case KVM_S390_VM_TOD_LOW:
		ret = kvm_s390_get_tod_low(kvm, attr);
		break;
	default:
		ret = -ENXIO;
		break;
	}
	return ret;
}

1037 1038 1039
static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_cpu_processor *proc;
1040
	u16 lowest_ibc, unblocked_ibc;
1041 1042 1043
	int ret = 0;

	mutex_lock(&kvm->lock);
1044
	if (kvm->created_vcpus) {
1045 1046 1047 1048 1049 1050 1051 1052 1053 1054
		ret = -EBUSY;
		goto out;
	}
	proc = kzalloc(sizeof(*proc), GFP_KERNEL);
	if (!proc) {
		ret = -ENOMEM;
		goto out;
	}
	if (!copy_from_user(proc, (void __user *)attr->addr,
			    sizeof(*proc))) {
1055
		kvm->arch.model.cpuid = proc->cpuid;
1056 1057
		lowest_ibc = sclp.ibc >> 16 & 0xfff;
		unblocked_ibc = sclp.ibc & 0xfff;
1058
		if (lowest_ibc && proc->ibc) {
1059 1060 1061 1062 1063 1064 1065
			if (proc->ibc > unblocked_ibc)
				kvm->arch.model.ibc = unblocked_ibc;
			else if (proc->ibc < lowest_ibc)
				kvm->arch.model.ibc = lowest_ibc;
			else
				kvm->arch.model.ibc = proc->ibc;
		}
1066
		memcpy(kvm->arch.model.fac_list, proc->fac_list,
1067
		       S390_ARCH_FAC_LIST_SIZE_BYTE);
1068 1069 1070 1071 1072 1073 1074
		VM_EVENT(kvm, 3, "SET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
			 kvm->arch.model.ibc,
			 kvm->arch.model.cpuid);
		VM_EVENT(kvm, 3, "SET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
			 kvm->arch.model.fac_list[0],
			 kvm->arch.model.fac_list[1],
			 kvm->arch.model.fac_list[2]);
1075 1076 1077 1078 1079 1080 1081 1082
	} else
		ret = -EFAULT;
	kfree(proc);
out:
	mutex_unlock(&kvm->lock);
	return ret;
}

1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105
static int kvm_s390_set_processor_feat(struct kvm *kvm,
				       struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_cpu_feat data;
	int ret = -EBUSY;

	if (copy_from_user(&data, (void __user *)attr->addr, sizeof(data)))
		return -EFAULT;
	if (!bitmap_subset((unsigned long *) data.feat,
			   kvm_s390_available_cpu_feat,
			   KVM_S390_VM_CPU_FEAT_NR_BITS))
		return -EINVAL;

	mutex_lock(&kvm->lock);
	if (!atomic_read(&kvm->online_vcpus)) {
		bitmap_copy(kvm->arch.cpu_feat, (unsigned long *) data.feat,
			    KVM_S390_VM_CPU_FEAT_NR_BITS);
		ret = 0;
	}
	mutex_unlock(&kvm->lock);
	return ret;
}

1106 1107 1108 1109 1110 1111 1112 1113 1114 1115
static int kvm_s390_set_processor_subfunc(struct kvm *kvm,
					  struct kvm_device_attr *attr)
{
	/*
	 * Once supported by kernel + hw, we have to store the subfunctions
	 * in kvm->arch and remember that user space configured them.
	 */
	return -ENXIO;
}

1116 1117 1118 1119 1120 1121 1122 1123
static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret = -ENXIO;

	switch (attr->attr) {
	case KVM_S390_VM_CPU_PROCESSOR:
		ret = kvm_s390_set_processor(kvm, attr);
		break;
1124 1125 1126
	case KVM_S390_VM_CPU_PROCESSOR_FEAT:
		ret = kvm_s390_set_processor_feat(kvm, attr);
		break;
1127 1128 1129
	case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
		ret = kvm_s390_set_processor_subfunc(kvm, attr);
		break;
1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143
	}
	return ret;
}

static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_cpu_processor *proc;
	int ret = 0;

	proc = kzalloc(sizeof(*proc), GFP_KERNEL);
	if (!proc) {
		ret = -ENOMEM;
		goto out;
	}
1144
	proc->cpuid = kvm->arch.model.cpuid;
1145
	proc->ibc = kvm->arch.model.ibc;
1146 1147
	memcpy(&proc->fac_list, kvm->arch.model.fac_list,
	       S390_ARCH_FAC_LIST_SIZE_BYTE);
1148 1149 1150 1151 1152 1153 1154
	VM_EVENT(kvm, 3, "GET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
		 kvm->arch.model.ibc,
		 kvm->arch.model.cpuid);
	VM_EVENT(kvm, 3, "GET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
		 kvm->arch.model.fac_list[0],
		 kvm->arch.model.fac_list[1],
		 kvm->arch.model.fac_list[2]);
1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
	if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc)))
		ret = -EFAULT;
	kfree(proc);
out:
	return ret;
}

static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_cpu_machine *mach;
	int ret = 0;

	mach = kzalloc(sizeof(*mach), GFP_KERNEL);
	if (!mach) {
		ret = -ENOMEM;
		goto out;
	}
	get_cpu_id((struct cpuid *) &mach->cpuid);
1173
	mach->ibc = sclp.ibc;
1174
	memcpy(&mach->fac_mask, kvm->arch.model.fac_mask,
1175
	       S390_ARCH_FAC_LIST_SIZE_BYTE);
1176
	memcpy((unsigned long *)&mach->fac_list, S390_lowcore.stfle_fac_list,
1177
	       sizeof(S390_lowcore.stfle_fac_list));
1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188
	VM_EVENT(kvm, 3, "GET: host ibc:  0x%4.4x, host cpuid:  0x%16.16llx",
		 kvm->arch.model.ibc,
		 kvm->arch.model.cpuid);
	VM_EVENT(kvm, 3, "GET: host facmask:  0x%16.16llx.%16.16llx.%16.16llx",
		 mach->fac_mask[0],
		 mach->fac_mask[1],
		 mach->fac_mask[2]);
	VM_EVENT(kvm, 3, "GET: host faclist:  0x%16.16llx.%16.16llx.%16.16llx",
		 mach->fac_list[0],
		 mach->fac_list[1],
		 mach->fac_list[2]);
1189 1190 1191 1192 1193 1194 1195
	if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach)))
		ret = -EFAULT;
	kfree(mach);
out:
	return ret;
}

1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220
static int kvm_s390_get_processor_feat(struct kvm *kvm,
				       struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_cpu_feat data;

	bitmap_copy((unsigned long *) data.feat, kvm->arch.cpu_feat,
		    KVM_S390_VM_CPU_FEAT_NR_BITS);
	if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
		return -EFAULT;
	return 0;
}

static int kvm_s390_get_machine_feat(struct kvm *kvm,
				     struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_cpu_feat data;

	bitmap_copy((unsigned long *) data.feat,
		    kvm_s390_available_cpu_feat,
		    KVM_S390_VM_CPU_FEAT_NR_BITS);
	if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
		return -EFAULT;
	return 0;
}

1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239
static int kvm_s390_get_processor_subfunc(struct kvm *kvm,
					  struct kvm_device_attr *attr)
{
	/*
	 * Once we can actually configure subfunctions (kernel + hw support),
	 * we have to check if they were already set by user space, if so copy
	 * them from kvm->arch.
	 */
	return -ENXIO;
}

static int kvm_s390_get_machine_subfunc(struct kvm *kvm,
					struct kvm_device_attr *attr)
{
	if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc,
	    sizeof(struct kvm_s390_vm_cpu_subfunc)))
		return -EFAULT;
	return 0;
}
1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250
static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret = -ENXIO;

	switch (attr->attr) {
	case KVM_S390_VM_CPU_PROCESSOR:
		ret = kvm_s390_get_processor(kvm, attr);
		break;
	case KVM_S390_VM_CPU_MACHINE:
		ret = kvm_s390_get_machine(kvm, attr);
		break;
1251 1252 1253 1254 1255 1256
	case KVM_S390_VM_CPU_PROCESSOR_FEAT:
		ret = kvm_s390_get_processor_feat(kvm, attr);
		break;
	case KVM_S390_VM_CPU_MACHINE_FEAT:
		ret = kvm_s390_get_machine_feat(kvm, attr);
		break;
1257 1258 1259 1260 1261 1262
	case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
		ret = kvm_s390_get_processor_subfunc(kvm, attr);
		break;
	case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
		ret = kvm_s390_get_machine_subfunc(kvm, attr);
		break;
1263 1264 1265 1266
	}
	return ret;
}

1267 1268 1269 1270 1271
static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret;

	switch (attr->group) {
1272
	case KVM_S390_VM_MEM_CTRL:
1273
		ret = kvm_s390_set_mem_control(kvm, attr);
1274
		break;
1275 1276 1277
	case KVM_S390_VM_TOD:
		ret = kvm_s390_set_tod(kvm, attr);
		break;
1278 1279 1280
	case KVM_S390_VM_CPU_MODEL:
		ret = kvm_s390_set_cpu_model(kvm, attr);
		break;
1281 1282 1283
	case KVM_S390_VM_CRYPTO:
		ret = kvm_s390_vm_set_crypto(kvm, attr);
		break;
1284 1285 1286
	case KVM_S390_VM_MIGRATION:
		ret = kvm_s390_vm_set_migration(kvm, attr);
		break;
1287 1288 1289 1290 1291 1292 1293 1294 1295 1296
	default:
		ret = -ENXIO;
		break;
	}

	return ret;
}

static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
1297 1298 1299 1300 1301 1302
	int ret;

	switch (attr->group) {
	case KVM_S390_VM_MEM_CTRL:
		ret = kvm_s390_get_mem_control(kvm, attr);
		break;
1303 1304 1305
	case KVM_S390_VM_TOD:
		ret = kvm_s390_get_tod(kvm, attr);
		break;
1306 1307 1308
	case KVM_S390_VM_CPU_MODEL:
		ret = kvm_s390_get_cpu_model(kvm, attr);
		break;
1309 1310 1311
	case KVM_S390_VM_MIGRATION:
		ret = kvm_s390_vm_get_migration(kvm, attr);
		break;
1312 1313 1314 1315 1316 1317
	default:
		ret = -ENXIO;
		break;
	}

	return ret;
1318 1319 1320 1321 1322 1323 1324
}

static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret;

	switch (attr->group) {
1325 1326 1327 1328
	case KVM_S390_VM_MEM_CTRL:
		switch (attr->attr) {
		case KVM_S390_VM_MEM_ENABLE_CMMA:
		case KVM_S390_VM_MEM_CLR_CMMA:
1329 1330
			ret = sclp.has_cmma ? 0 : -ENXIO;
			break;
1331
		case KVM_S390_VM_MEM_LIMIT_SIZE:
1332 1333 1334 1335 1336 1337 1338
			ret = 0;
			break;
		default:
			ret = -ENXIO;
			break;
		}
		break;
1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349
	case KVM_S390_VM_TOD:
		switch (attr->attr) {
		case KVM_S390_VM_TOD_LOW:
		case KVM_S390_VM_TOD_HIGH:
			ret = 0;
			break;
		default:
			ret = -ENXIO;
			break;
		}
		break;
1350 1351 1352 1353
	case KVM_S390_VM_CPU_MODEL:
		switch (attr->attr) {
		case KVM_S390_VM_CPU_PROCESSOR:
		case KVM_S390_VM_CPU_MACHINE:
1354 1355
		case KVM_S390_VM_CPU_PROCESSOR_FEAT:
		case KVM_S390_VM_CPU_MACHINE_FEAT:
1356
		case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
1357 1358
			ret = 0;
			break;
1359 1360
		/* configuring subfunctions is not supported yet */
		case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1361 1362 1363 1364 1365
		default:
			ret = -ENXIO;
			break;
		}
		break;
1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378
	case KVM_S390_VM_CRYPTO:
		switch (attr->attr) {
		case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
		case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
		case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
		case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
			ret = 0;
			break;
		default:
			ret = -ENXIO;
			break;
		}
		break;
1379 1380 1381
	case KVM_S390_VM_MIGRATION:
		ret = 0;
		break;
1382 1383 1384 1385 1386 1387 1388 1389
	default:
		ret = -ENXIO;
		break;
	}

	return ret;
}

1390 1391 1392 1393
static long kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
{
	uint8_t *keys;
	uint64_t hva;
1394
	int srcu_idx, i, r = 0;
1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406

	if (args->flags != 0)
		return -EINVAL;

	/* Is this guest using storage keys? */
	if (!mm_use_skey(current->mm))
		return KVM_S390_GET_SKEYS_NONE;

	/* Enforce sane limit on memory allocation */
	if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
		return -EINVAL;

1407
	keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL);
1408 1409 1410
	if (!keys)
		return -ENOMEM;

1411
	down_read(&current->mm->mmap_sem);
1412
	srcu_idx = srcu_read_lock(&kvm->srcu);
1413 1414 1415 1416
	for (i = 0; i < args->count; i++) {
		hva = gfn_to_hva(kvm, args->start_gfn + i);
		if (kvm_is_error_hva(hva)) {
			r = -EFAULT;
1417
			break;
1418 1419
		}

1420 1421
		r = get_guest_storage_key(current->mm, hva, &keys[i]);
		if (r)
1422
			break;
1423
	}
1424
	srcu_read_unlock(&kvm->srcu, srcu_idx);
1425 1426 1427 1428 1429 1430 1431
	up_read(&current->mm->mmap_sem);

	if (!r) {
		r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys,
				 sizeof(uint8_t) * args->count);
		if (r)
			r = -EFAULT;
1432 1433 1434 1435 1436 1437 1438 1439 1440 1441
	}

	kvfree(keys);
	return r;
}

static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
{
	uint8_t *keys;
	uint64_t hva;
1442
	int srcu_idx, i, r = 0;
1443 1444 1445 1446 1447 1448 1449 1450

	if (args->flags != 0)
		return -EINVAL;

	/* Enforce sane limit on memory allocation */
	if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
		return -EINVAL;

1451
	keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL);
1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462
	if (!keys)
		return -ENOMEM;

	r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr,
			   sizeof(uint8_t) * args->count);
	if (r) {
		r = -EFAULT;
		goto out;
	}

	/* Enable storage key handling for the guest */
1463 1464 1465
	r = s390_enable_skey();
	if (r)
		goto out;
1466

1467
	down_read(&current->mm->mmap_sem);
1468
	srcu_idx = srcu_read_lock(&kvm->srcu);
1469 1470 1471 1472
	for (i = 0; i < args->count; i++) {
		hva = gfn_to_hva(kvm, args->start_gfn + i);
		if (kvm_is_error_hva(hva)) {
			r = -EFAULT;
1473
			break;
1474 1475 1476 1477 1478
		}

		/* Lowest order bit is reserved */
		if (keys[i] & 0x01) {
			r = -EINVAL;
1479
			break;
1480 1481
		}

1482
		r = set_guest_storage_key(current->mm, hva, keys[i], 0);
1483
		if (r)
1484
			break;
1485
	}
1486
	srcu_read_unlock(&kvm->srcu, srcu_idx);
1487
	up_read(&current->mm->mmap_sem);
1488 1489 1490 1491 1492
out:
	kvfree(keys);
	return r;
}

1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574
/*
 * Base address and length must be sent at the start of each block, therefore
 * it's cheaper to send some clean data, as long as it's less than the size of
 * two longs.
 */
#define KVM_S390_MAX_BIT_DISTANCE (2 * sizeof(void *))
/* for consistency */
#define KVM_S390_CMMA_SIZE_MAX ((u32)KVM_S390_SKEYS_MAX)

/*
 * This function searches for the next page with dirty CMMA attributes, and
 * saves the attributes in the buffer up to either the end of the buffer or
 * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found;
 * no trailing clean bytes are saved.
 * In case no dirty bits were found, or if CMMA was not enabled or used, the
 * output buffer will indicate 0 as length.
 */
static int kvm_s390_get_cmma_bits(struct kvm *kvm,
				  struct kvm_s390_cmma_log *args)
{
	struct kvm_s390_migration_state *s = kvm->arch.migration_state;
	unsigned long bufsize, hva, pgstev, i, next, cur;
	int srcu_idx, peek, r = 0, rr;
	u8 *res;

	cur = args->start_gfn;
	i = next = pgstev = 0;

	if (unlikely(!kvm->arch.use_cmma))
		return -ENXIO;
	/* Invalid/unsupported flags were specified */
	if (args->flags & ~KVM_S390_CMMA_PEEK)
		return -EINVAL;
	/* Migration mode query, and we are not doing a migration */
	peek = !!(args->flags & KVM_S390_CMMA_PEEK);
	if (!peek && !s)
		return -EINVAL;
	/* CMMA is disabled or was not used, or the buffer has length zero */
	bufsize = min(args->count, KVM_S390_CMMA_SIZE_MAX);
	if (!bufsize || !kvm->mm->context.use_cmma) {
		memset(args, 0, sizeof(*args));
		return 0;
	}

	if (!peek) {
		/* We are not peeking, and there are no dirty pages */
		if (!atomic64_read(&s->dirty_pages)) {
			memset(args, 0, sizeof(*args));
			return 0;
		}
		cur = find_next_bit(s->pgste_bitmap, s->bitmap_size,
				    args->start_gfn);
		if (cur >= s->bitmap_size)	/* nothing found, loop back */
			cur = find_next_bit(s->pgste_bitmap, s->bitmap_size, 0);
		if (cur >= s->bitmap_size) {	/* again! (very unlikely) */
			memset(args, 0, sizeof(*args));
			return 0;
		}
		next = find_next_bit(s->pgste_bitmap, s->bitmap_size, cur + 1);
	}

	res = vmalloc(bufsize);
	if (!res)
		return -ENOMEM;

	args->start_gfn = cur;

	down_read(&kvm->mm->mmap_sem);
	srcu_idx = srcu_read_lock(&kvm->srcu);
	while (i < bufsize) {
		hva = gfn_to_hva(kvm, cur);
		if (kvm_is_error_hva(hva)) {
			r = -EFAULT;
			break;
		}
		/* decrement only if we actually flipped the bit to 0 */
		if (!peek && test_and_clear_bit(cur, s->pgste_bitmap))
			atomic64_dec(&s->dirty_pages);
		r = get_pgste(kvm->mm, hva, &pgstev);
		if (r < 0)
			pgstev = 0;
		/* save the value */
1575
		res[i++] = (pgstev >> 24) & 0x43;
1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652
		/*
		 * if the next bit is too far away, stop.
		 * if we reached the previous "next", find the next one
		 */
		if (!peek) {
			if (next > cur + KVM_S390_MAX_BIT_DISTANCE)
				break;
			if (cur == next)
				next = find_next_bit(s->pgste_bitmap,
						     s->bitmap_size, cur + 1);
		/* reached the end of the bitmap or of the buffer, stop */
			if ((next >= s->bitmap_size) ||
			    (next >= args->start_gfn + bufsize))
				break;
		}
		cur++;
	}
	srcu_read_unlock(&kvm->srcu, srcu_idx);
	up_read(&kvm->mm->mmap_sem);
	args->count = i;
	args->remaining = s ? atomic64_read(&s->dirty_pages) : 0;

	rr = copy_to_user((void __user *)args->values, res, args->count);
	if (rr)
		r = -EFAULT;

	vfree(res);
	return r;
}

/*
 * This function sets the CMMA attributes for the given pages. If the input
 * buffer has zero length, no action is taken, otherwise the attributes are
 * set and the mm->context.use_cmma flag is set.
 */
static int kvm_s390_set_cmma_bits(struct kvm *kvm,
				  const struct kvm_s390_cmma_log *args)
{
	unsigned long hva, mask, pgstev, i;
	uint8_t *bits;
	int srcu_idx, r = 0;

	mask = args->mask;

	if (!kvm->arch.use_cmma)
		return -ENXIO;
	/* invalid/unsupported flags */
	if (args->flags != 0)
		return -EINVAL;
	/* Enforce sane limit on memory allocation */
	if (args->count > KVM_S390_CMMA_SIZE_MAX)
		return -EINVAL;
	/* Nothing to do */
	if (args->count == 0)
		return 0;

	bits = vmalloc(sizeof(*bits) * args->count);
	if (!bits)
		return -ENOMEM;

	r = copy_from_user(bits, (void __user *)args->values, args->count);
	if (r) {
		r = -EFAULT;
		goto out;
	}

	down_read(&kvm->mm->mmap_sem);
	srcu_idx = srcu_read_lock(&kvm->srcu);
	for (i = 0; i < args->count; i++) {
		hva = gfn_to_hva(kvm, args->start_gfn + i);
		if (kvm_is_error_hva(hva)) {
			r = -EFAULT;
			break;
		}

		pgstev = bits[i];
		pgstev = pgstev << 24;
1653
		mask &= _PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT;
1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668
		set_pgste_bits(kvm->mm, hva, mask, pgstev);
	}
	srcu_read_unlock(&kvm->srcu, srcu_idx);
	up_read(&kvm->mm->mmap_sem);

	if (!kvm->mm->context.use_cmma) {
		down_write(&kvm->mm->mmap_sem);
		kvm->mm->context.use_cmma = 1;
		up_write(&kvm->mm->mmap_sem);
	}
out:
	vfree(bits);
	return r;
}

1669 1670 1671 1672 1673
long kvm_arch_vm_ioctl(struct file *filp,
		       unsigned int ioctl, unsigned long arg)
{
	struct kvm *kvm = filp->private_data;
	void __user *argp = (void __user *)arg;
1674
	struct kvm_device_attr attr;
1675 1676 1677
	int r;

	switch (ioctl) {
1678 1679 1680 1681 1682 1683 1684 1685 1686
	case KVM_S390_INTERRUPT: {
		struct kvm_s390_interrupt s390int;

		r = -EFAULT;
		if (copy_from_user(&s390int, argp, sizeof(s390int)))
			break;
		r = kvm_s390_inject_vm(kvm, &s390int);
		break;
	}
1687 1688 1689 1690 1691 1692 1693 1694
	case KVM_ENABLE_CAP: {
		struct kvm_enable_cap cap;
		r = -EFAULT;
		if (copy_from_user(&cap, argp, sizeof(cap)))
			break;
		r = kvm_vm_ioctl_enable_cap(kvm, &cap);
		break;
	}
1695 1696 1697 1698 1699 1700 1701
	case KVM_CREATE_IRQCHIP: {
		struct kvm_irq_routing_entry routing;

		r = -EINVAL;
		if (kvm->arch.use_irqchip) {
			/* Set up dummy routing. */
			memset(&routing, 0, sizeof(routing));
1702
			r = kvm_set_irq_routing(kvm, &routing, 0, 0);
1703 1704 1705
		}
		break;
	}
1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726
	case KVM_SET_DEVICE_ATTR: {
		r = -EFAULT;
		if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
			break;
		r = kvm_s390_vm_set_attr(kvm, &attr);
		break;
	}
	case KVM_GET_DEVICE_ATTR: {
		r = -EFAULT;
		if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
			break;
		r = kvm_s390_vm_get_attr(kvm, &attr);
		break;
	}
	case KVM_HAS_DEVICE_ATTR: {
		r = -EFAULT;
		if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
			break;
		r = kvm_s390_vm_has_attr(kvm, &attr);
		break;
	}
1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746
	case KVM_S390_GET_SKEYS: {
		struct kvm_s390_skeys args;

		r = -EFAULT;
		if (copy_from_user(&args, argp,
				   sizeof(struct kvm_s390_skeys)))
			break;
		r = kvm_s390_get_skeys(kvm, &args);
		break;
	}
	case KVM_S390_SET_SKEYS: {
		struct kvm_s390_skeys args;

		r = -EFAULT;
		if (copy_from_user(&args, argp,
				   sizeof(struct kvm_s390_skeys)))
			break;
		r = kvm_s390_set_skeys(kvm, &args);
		break;
	}
1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769
	case KVM_S390_GET_CMMA_BITS: {
		struct kvm_s390_cmma_log args;

		r = -EFAULT;
		if (copy_from_user(&args, argp, sizeof(args)))
			break;
		r = kvm_s390_get_cmma_bits(kvm, &args);
		if (!r) {
			r = copy_to_user(argp, &args, sizeof(args));
			if (r)
				r = -EFAULT;
		}
		break;
	}
	case KVM_S390_SET_CMMA_BITS: {
		struct kvm_s390_cmma_log args;

		r = -EFAULT;
		if (copy_from_user(&args, argp, sizeof(args)))
			break;
		r = kvm_s390_set_cmma_bits(kvm, &args);
		break;
	}
1770
	default:
1771
		r = -ENOTTY;
1772 1773 1774 1775 1776
	}

	return r;
}

1777 1778 1779
static int kvm_s390_query_ap_config(u8 *config)
{
	u32 fcn_code = 0x04000000UL;
1780
	u32 cc = 0;
1781

1782
	memset(config, 0, 128);
1783 1784 1785 1786
	asm volatile(
		"lgr 0,%1\n"
		"lgr 2,%2\n"
		".long 0xb2af0000\n"		/* PQAP(QCI) */
1787
		"0: ipm %0\n"
1788
		"srl %0,28\n"
1789 1790 1791
		"1:\n"
		EX_TABLE(0b, 1b)
		: "+r" (cc)
1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803
		: "r" (fcn_code), "r" (config)
		: "cc", "0", "2", "memory"
	);

	return cc;
}

static int kvm_s390_apxa_installed(void)
{
	u8 config[128];
	int cc;

1804
	if (test_facility(12)) {
1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825
		cc = kvm_s390_query_ap_config(config);

		if (cc)
			pr_err("PQAP(QCI) failed with cc=%d", cc);
		else
			return config[0] & 0x40;
	}

	return 0;
}

static void kvm_s390_set_crycb_format(struct kvm *kvm)
{
	kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb;

	if (kvm_s390_apxa_installed())
		kvm->arch.crypto.crycbd |= CRYCB_FORMAT2;
	else
		kvm->arch.crypto.crycbd |= CRYCB_FORMAT1;
}

1826
static u64 kvm_s390_get_initial_cpuid(void)
1827
{
1828 1829 1830 1831 1832
	struct cpuid cpuid;

	get_cpu_id(&cpuid);
	cpuid.version = 0xff;
	return *((u64 *) &cpuid);
1833 1834
}

1835
static void kvm_s390_crypto_init(struct kvm *kvm)
1836
{
1837
	if (!test_kvm_facility(kvm, 76))
1838
		return;
1839

1840
	kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb;
1841
	kvm_s390_set_crycb_format(kvm);
1842

1843 1844 1845 1846 1847 1848 1849
	/* Enable AES/DEA protected key functions by default */
	kvm->arch.crypto.aes_kw = 1;
	kvm->arch.crypto.dea_kw = 1;
	get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask,
			 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
	get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask,
			 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
1850 1851
}

1852 1853 1854
static void sca_dispose(struct kvm *kvm)
{
	if (kvm->arch.use_esca)
1855
		free_pages_exact(kvm->arch.sca, sizeof(struct esca_block));
1856 1857 1858 1859 1860
	else
		free_page((unsigned long)(kvm->arch.sca));
	kvm->arch.sca = NULL;
}

1861
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
1862
{
1863
	gfp_t alloc_flags = GFP_KERNEL;
1864
	int i, rc;
1865
	char debug_name[16];
1866
	static unsigned long sca_offset;
1867

1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878
	rc = -EINVAL;
#ifdef CONFIG_KVM_S390_UCONTROL
	if (type & ~KVM_VM_S390_UCONTROL)
		goto out_err;
	if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN)))
		goto out_err;
#else
	if (type)
		goto out_err;
#endif

1879 1880
	rc = s390_enable_sie();
	if (rc)
1881
		goto out_err;
1882

1883 1884
	rc = -ENOMEM;

1885
	kvm->arch.use_esca = 0; /* start with basic SCA */
1886 1887
	if (!sclp.has_64bscao)
		alloc_flags |= GFP_DMA;
1888
	rwlock_init(&kvm->arch.sca_lock);
1889
	kvm->arch.sca = (struct bsca_block *) get_zeroed_page(alloc_flags);
1890
	if (!kvm->arch.sca)
1891
		goto out_err;
1892
	spin_lock(&kvm_lock);
1893
	sca_offset += 16;
1894
	if (sca_offset + sizeof(struct bsca_block) > PAGE_SIZE)
1895
		sca_offset = 0;
1896 1897
	kvm->arch.sca = (struct bsca_block *)
			((char *) kvm->arch.sca + sca_offset);
1898
	spin_unlock(&kvm_lock);
1899 1900 1901

	sprintf(debug_name, "kvm-%u", current->pid);

1902
	kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long));
1903
	if (!kvm->arch.dbf)
1904
		goto out_err;
1905

1906 1907 1908
	kvm->arch.sie_page2 =
	     (struct sie_page2 *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!kvm->arch.sie_page2)
1909
		goto out_err;
1910

1911
	/* Populate the facility mask initially. */
1912
	memcpy(kvm->arch.model.fac_mask, S390_lowcore.stfle_fac_list,
1913
	       sizeof(S390_lowcore.stfle_fac_list));
1914 1915
	for (i = 0; i < S390_ARCH_FAC_LIST_SIZE_U64; i++) {
		if (i < kvm_s390_fac_list_mask_size())
1916
			kvm->arch.model.fac_mask[i] &= kvm_s390_fac_list_mask[i];
1917
		else
1918
			kvm->arch.model.fac_mask[i] = 0UL;
1919 1920
	}

1921
	/* Populate the facility list initially. */
1922 1923
	kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list;
	memcpy(kvm->arch.model.fac_list, kvm->arch.model.fac_mask,
1924 1925
	       S390_ARCH_FAC_LIST_SIZE_BYTE);

1926 1927 1928 1929
	/* we are always in czam mode - even on pre z14 machines */
	set_kvm_facility(kvm->arch.model.fac_mask, 138);
	set_kvm_facility(kvm->arch.model.fac_list, 138);
	/* we emulate STHYI in kvm */
J
Janosch Frank 已提交
1930 1931
	set_kvm_facility(kvm->arch.model.fac_mask, 74);
	set_kvm_facility(kvm->arch.model.fac_list, 74);
1932 1933 1934 1935
	if (MACHINE_HAS_TLB_GUEST) {
		set_kvm_facility(kvm->arch.model.fac_mask, 147);
		set_kvm_facility(kvm->arch.model.fac_list, 147);
	}
J
Janosch Frank 已提交
1936

1937
	kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid();
1938
	kvm->arch.model.ibc = sclp.ibc & 0x0fff;
1939

1940
	kvm_s390_crypto_init(kvm);
1941

1942 1943 1944
	mutex_init(&kvm->arch.float_int.ais_lock);
	kvm->arch.float_int.simm = 0;
	kvm->arch.float_int.nimm = 0;
1945
	spin_lock_init(&kvm->arch.float_int.lock);
1946 1947
	for (i = 0; i < FIRQ_LIST_COUNT; i++)
		INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
1948
	init_waitqueue_head(&kvm->arch.ipte_wq);
1949
	mutex_init(&kvm->arch.ipte_mutex);
1950

1951
	debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
1952
	VM_EVENT(kvm, 3, "vm created with type %lu", type);
1953

1954 1955
	if (type & KVM_VM_S390_UCONTROL) {
		kvm->arch.gmap = NULL;
1956
		kvm->arch.mem_limit = KVM_S390_NO_MEM_LIMIT;
1957
	} else {
1958
		if (sclp.hamax == U64_MAX)
1959
			kvm->arch.mem_limit = TASK_SIZE_MAX;
1960
		else
1961
			kvm->arch.mem_limit = min_t(unsigned long, TASK_SIZE_MAX,
1962
						    sclp.hamax + 1);
1963
		kvm->arch.gmap = gmap_create(current->mm, kvm->arch.mem_limit - 1);
1964
		if (!kvm->arch.gmap)
1965
			goto out_err;
1966
		kvm->arch.gmap->private = kvm;
1967
		kvm->arch.gmap->pfault_enabled = 0;
1968
	}
1969 1970

	kvm->arch.css_support = 0;
1971
	kvm->arch.use_irqchip = 0;
1972
	kvm->arch.epoch = 0;
1973

1974
	spin_lock_init(&kvm->arch.start_stop_lock);
1975
	kvm_s390_vsie_init(kvm);
1976
	KVM_EVENT(3, "vm 0x%pK created by pid %u", kvm, current->pid);
1977

1978
	return 0;
1979
out_err:
1980
	free_page((unsigned long)kvm->arch.sie_page2);
1981
	debug_unregister(kvm->arch.dbf);
1982
	sca_dispose(kvm);
1983
	KVM_EVENT(3, "creation of vm failed: %d", rc);
1984
	return rc;
1985 1986
}

1987 1988 1989 1990 1991 1992 1993 1994 1995 1996
bool kvm_arch_has_vcpu_debugfs(void)
{
	return false;
}

int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
{
	return 0;
}

1997 1998 1999
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
	VCPU_EVENT(vcpu, 3, "%s", "free cpu");
2000
	trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
2001
	kvm_s390_clear_local_irqs(vcpu);
2002
	kvm_clear_async_pf_completion_queue(vcpu);
2003
	if (!kvm_is_ucontrol(vcpu->kvm))
2004
		sca_del_vcpu(vcpu);
2005 2006

	if (kvm_is_ucontrol(vcpu->kvm))
2007
		gmap_remove(vcpu->arch.gmap);
2008

2009
	if (vcpu->kvm->arch.use_cmma)
2010
		kvm_s390_vcpu_unsetup_cmma(vcpu);
2011
	free_page((unsigned long)(vcpu->arch.sie_block));
2012

2013
	kvm_vcpu_uninit(vcpu);
2014
	kmem_cache_free(kvm_vcpu_cache, vcpu);
2015 2016 2017 2018 2019
}

static void kvm_free_vcpus(struct kvm *kvm)
{
	unsigned int i;
2020
	struct kvm_vcpu *vcpu;
2021

2022 2023 2024 2025 2026 2027 2028 2029 2030
	kvm_for_each_vcpu(i, vcpu, kvm)
		kvm_arch_vcpu_destroy(vcpu);

	mutex_lock(&kvm->lock);
	for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
		kvm->vcpus[i] = NULL;

	atomic_set(&kvm->online_vcpus, 0);
	mutex_unlock(&kvm->lock);
2031 2032
}

2033 2034
void kvm_arch_destroy_vm(struct kvm *kvm)
{
2035
	kvm_free_vcpus(kvm);
2036
	sca_dispose(kvm);
2037
	debug_unregister(kvm->arch.dbf);
2038
	free_page((unsigned long)kvm->arch.sie_page2);
2039
	if (!kvm_is_ucontrol(kvm))
2040
		gmap_remove(kvm->arch.gmap);
2041
	kvm_s390_destroy_adapters(kvm);
2042
	kvm_s390_clear_float_irqs(kvm);
2043
	kvm_s390_vsie_destroy(kvm);
2044 2045 2046 2047
	if (kvm->arch.migration_state) {
		vfree(kvm->arch.migration_state->pgste_bitmap);
		kfree(kvm->arch.migration_state);
	}
2048
	KVM_EVENT(3, "vm 0x%pK destroyed", kvm);
2049 2050 2051
}

/* Section: vcpu related */
2052 2053
static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu)
{
2054
	vcpu->arch.gmap = gmap_create(current->mm, -1UL);
2055 2056 2057 2058 2059 2060 2061
	if (!vcpu->arch.gmap)
		return -ENOMEM;
	vcpu->arch.gmap->private = vcpu->kvm;

	return 0;
}

2062 2063
static void sca_del_vcpu(struct kvm_vcpu *vcpu)
{
2064 2065
	if (!kvm_s390_use_sca_entries())
		return;
2066
	read_lock(&vcpu->kvm->arch.sca_lock);
2067 2068
	if (vcpu->kvm->arch.use_esca) {
		struct esca_block *sca = vcpu->kvm->arch.sca;
2069

2070
		clear_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
2071
		sca->cpu[vcpu->vcpu_id].sda = 0;
2072 2073 2074 2075
	} else {
		struct bsca_block *sca = vcpu->kvm->arch.sca;

		clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
2076
		sca->cpu[vcpu->vcpu_id].sda = 0;
2077
	}
2078
	read_unlock(&vcpu->kvm->arch.sca_lock);
2079 2080
}

2081
static void sca_add_vcpu(struct kvm_vcpu *vcpu)
2082
{
2083 2084 2085 2086 2087 2088 2089
	if (!kvm_s390_use_sca_entries()) {
		struct bsca_block *sca = vcpu->kvm->arch.sca;

		/* we still need the basic sca for the ipte control */
		vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
		vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
	}
2090 2091 2092
	read_lock(&vcpu->kvm->arch.sca_lock);
	if (vcpu->kvm->arch.use_esca) {
		struct esca_block *sca = vcpu->kvm->arch.sca;
2093

2094
		sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
2095 2096
		vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
		vcpu->arch.sie_block->scaol = (__u32)(__u64)sca & ~0x3fU;
2097
		vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
2098
		set_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
2099
	} else {
2100
		struct bsca_block *sca = vcpu->kvm->arch.sca;
2101

2102
		sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
2103 2104
		vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
		vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
2105
		set_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
2106
	}
2107
	read_unlock(&vcpu->kvm->arch.sca_lock);
2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150
}

/* Basic SCA to Extended SCA data copy routines */
static inline void sca_copy_entry(struct esca_entry *d, struct bsca_entry *s)
{
	d->sda = s->sda;
	d->sigp_ctrl.c = s->sigp_ctrl.c;
	d->sigp_ctrl.scn = s->sigp_ctrl.scn;
}

static void sca_copy_b_to_e(struct esca_block *d, struct bsca_block *s)
{
	int i;

	d->ipte_control = s->ipte_control;
	d->mcn[0] = s->mcn;
	for (i = 0; i < KVM_S390_BSCA_CPU_SLOTS; i++)
		sca_copy_entry(&d->cpu[i], &s->cpu[i]);
}

static int sca_switch_to_extended(struct kvm *kvm)
{
	struct bsca_block *old_sca = kvm->arch.sca;
	struct esca_block *new_sca;
	struct kvm_vcpu *vcpu;
	unsigned int vcpu_idx;
	u32 scaol, scaoh;

	new_sca = alloc_pages_exact(sizeof(*new_sca), GFP_KERNEL|__GFP_ZERO);
	if (!new_sca)
		return -ENOMEM;

	scaoh = (u32)((u64)(new_sca) >> 32);
	scaol = (u32)(u64)(new_sca) & ~0x3fU;

	kvm_s390_vcpu_block_all(kvm);
	write_lock(&kvm->arch.sca_lock);

	sca_copy_b_to_e(new_sca, old_sca);

	kvm_for_each_vcpu(vcpu_idx, vcpu, kvm) {
		vcpu->arch.sie_block->scaoh = scaoh;
		vcpu->arch.sie_block->scaol = scaol;
2151
		vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
2152 2153 2154 2155 2156 2157 2158 2159 2160
	}
	kvm->arch.sca = new_sca;
	kvm->arch.use_esca = 1;

	write_unlock(&kvm->arch.sca_lock);
	kvm_s390_vcpu_unblock_all(kvm);

	free_page((unsigned long)old_sca);

2161 2162
	VM_EVENT(kvm, 2, "Switched to ESCA (0x%pK -> 0x%pK)",
		 old_sca, kvm->arch.sca);
2163
	return 0;
2164 2165 2166 2167
}

static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
{
2168 2169
	int rc;

2170 2171 2172 2173 2174
	if (!kvm_s390_use_sca_entries()) {
		if (id < KVM_MAX_VCPUS)
			return true;
		return false;
	}
2175 2176
	if (id < KVM_S390_BSCA_CPU_SLOTS)
		return true;
2177
	if (!sclp.has_esca || !sclp.has_64bscao)
2178 2179 2180 2181 2182 2183 2184
		return false;

	mutex_lock(&kvm->lock);
	rc = kvm->arch.use_esca ? 0 : sca_switch_to_extended(kvm);
	mutex_unlock(&kvm->lock);

	return rc == 0 && id < KVM_S390_ESCA_CPU_SLOTS;
2185 2186
}

2187 2188
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
2189 2190
	vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
	kvm_clear_async_pf_completion_queue(vcpu);
2191 2192
	vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
				    KVM_SYNC_GPRS |
2193
				    KVM_SYNC_ACRS |
2194 2195 2196
				    KVM_SYNC_CRS |
				    KVM_SYNC_ARCH0 |
				    KVM_SYNC_PFAULT;
2197
	kvm_s390_set_prefix(vcpu, 0);
2198 2199
	if (test_kvm_facility(vcpu->kvm, 64))
		vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
F
Fan Zhang 已提交
2200 2201
	if (test_kvm_facility(vcpu->kvm, 133))
		vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB;
2202 2203 2204 2205
	/* fprs can be synchronized via vrs, even if the guest has no vx. With
	 * MACHINE_HAS_VX, (load|store)_fpu_regs() will work with vrs format.
	 */
	if (MACHINE_HAS_VX)
2206
		vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
2207 2208
	else
		vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS;
2209 2210 2211 2212

	if (kvm_is_ucontrol(vcpu->kvm))
		return __kvm_ucontrol_vcpu_init(vcpu);

2213 2214 2215
	return 0;
}

2216 2217 2218 2219
/* needs disabled preemption to protect from TOD sync and vcpu_load/put */
static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
	WARN_ON_ONCE(vcpu->arch.cputm_start != 0);
2220
	raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2221
	vcpu->arch.cputm_start = get_tod_clock_fast();
2222
	raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2223 2224 2225 2226 2227 2228
}

/* needs disabled preemption to protect from TOD sync and vcpu_load/put */
static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
	WARN_ON_ONCE(vcpu->arch.cputm_start == 0);
2229
	raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2230 2231
	vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start;
	vcpu->arch.cputm_start = 0;
2232
	raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264
}

/* needs disabled preemption to protect from TOD sync and vcpu_load/put */
static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
	WARN_ON_ONCE(vcpu->arch.cputm_enabled);
	vcpu->arch.cputm_enabled = true;
	__start_cpu_timer_accounting(vcpu);
}

/* needs disabled preemption to protect from TOD sync and vcpu_load/put */
static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
	WARN_ON_ONCE(!vcpu->arch.cputm_enabled);
	__stop_cpu_timer_accounting(vcpu);
	vcpu->arch.cputm_enabled = false;
}

static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
	preempt_disable(); /* protect from TOD sync and vcpu_load/put */
	__enable_cpu_timer_accounting(vcpu);
	preempt_enable();
}

static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
{
	preempt_disable(); /* protect from TOD sync and vcpu_load/put */
	__disable_cpu_timer_accounting(vcpu);
	preempt_enable();
}

2265 2266 2267
/* set the cpu timer - may only be called from the VCPU thread itself */
void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm)
{
2268
	preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2269
	raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2270 2271
	if (vcpu->arch.cputm_enabled)
		vcpu->arch.cputm_start = get_tod_clock_fast();
2272
	vcpu->arch.sie_block->cputm = cputm;
2273
	raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2274
	preempt_enable();
2275 2276
}

2277
/* update and get the cpu timer - can also be called from other VCPU threads */
2278 2279
__u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu)
{
2280
	unsigned int seq;
2281 2282 2283 2284 2285
	__u64 value;

	if (unlikely(!vcpu->arch.cputm_enabled))
		return vcpu->arch.sie_block->cputm;

2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299
	preempt_disable(); /* protect from TOD sync and vcpu_load/put */
	do {
		seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount);
		/*
		 * If the writer would ever execute a read in the critical
		 * section, e.g. in irq context, we have a deadlock.
		 */
		WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu);
		value = vcpu->arch.sie_block->cputm;
		/* if cputm_start is 0, accounting is being started/stopped */
		if (likely(vcpu->arch.cputm_start))
			value -= get_tod_clock_fast() - vcpu->arch.cputm_start;
	} while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1));
	preempt_enable();
2300
	return value;
2301 2302
}

2303 2304
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
2305

2306
	gmap_enable(vcpu->arch.enabled_gmap);
2307
	atomic_or(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
2308
	if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
2309
		__start_cpu_timer_accounting(vcpu);
2310
	vcpu->cpu = cpu;
2311 2312 2313 2314
}

void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
2315
	vcpu->cpu = -1;
2316
	if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
2317
		__stop_cpu_timer_accounting(vcpu);
2318
	atomic_andnot(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
2319 2320
	vcpu->arch.enabled_gmap = gmap_get_enabled();
	gmap_disable(vcpu->arch.enabled_gmap);
2321

2322 2323 2324 2325 2326 2327 2328
}

static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
{
	/* this equals initial cpu reset in pop, but we don't switch to ESA */
	vcpu->arch.sie_block->gpsw.mask = 0UL;
	vcpu->arch.sie_block->gpsw.addr = 0UL;
2329
	kvm_s390_set_prefix(vcpu, 0);
2330
	kvm_s390_set_cpu_timer(vcpu, 0);
2331 2332 2333 2334 2335
	vcpu->arch.sie_block->ckc       = 0UL;
	vcpu->arch.sie_block->todpr     = 0;
	memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64));
	vcpu->arch.sie_block->gcr[0]  = 0xE0UL;
	vcpu->arch.sie_block->gcr[14] = 0xC2000000UL;
2336 2337 2338
	/* make sure the new fpc will be lazily loaded */
	save_fpu_regs();
	current->thread.fpu.fpc = 0;
2339
	vcpu->arch.sie_block->gbea = 1;
2340
	vcpu->arch.sie_block->pp = 0;
2341 2342
	vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
	kvm_clear_async_pf_completion_queue(vcpu);
2343 2344
	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
		kvm_s390_vcpu_stop(vcpu);
2345
	kvm_s390_clear_local_irqs(vcpu);
2346 2347
}

2348
void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
2349
{
2350
	mutex_lock(&vcpu->kvm->lock);
2351
	preempt_disable();
2352
	vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch;
2353
	preempt_enable();
2354
	mutex_unlock(&vcpu->kvm->lock);
2355
	if (!kvm_is_ucontrol(vcpu->kvm)) {
2356
		vcpu->arch.gmap = vcpu->kvm->arch.gmap;
2357
		sca_add_vcpu(vcpu);
2358
	}
2359 2360
	if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0)
		vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
2361 2362
	/* make vcpu_load load the right gmap on the first trigger */
	vcpu->arch.enabled_gmap = vcpu->arch.gmap;
2363 2364
}

2365 2366
static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
{
2367
	if (!test_kvm_facility(vcpu->kvm, 76))
2368 2369
		return;

2370 2371 2372 2373 2374 2375 2376
	vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA);

	if (vcpu->kvm->arch.crypto.aes_kw)
		vcpu->arch.sie_block->ecb3 |= ECB3_AES;
	if (vcpu->kvm->arch.crypto.dea_kw)
		vcpu->arch.sie_block->ecb3 |= ECB3_DEA;

2377 2378 2379
	vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
}

2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391
void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)
{
	free_page(vcpu->arch.sie_block->cbrlo);
	vcpu->arch.sie_block->cbrlo = 0;
}

int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu)
{
	vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL);
	if (!vcpu->arch.sie_block->cbrlo)
		return -ENOMEM;

2392
	vcpu->arch.sie_block->ecb2 &= ~ECB2_PFMFI;
2393 2394 2395
	return 0;
}

2396 2397 2398 2399 2400
static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu)
{
	struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model;

	vcpu->arch.sie_block->ibc = model->ibc;
2401
	if (test_kvm_facility(vcpu->kvm, 7))
2402
		vcpu->arch.sie_block->fac = (u32)(u64) model->fac_list;
2403 2404
}

2405 2406
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
2407
	int rc = 0;
2408

2409 2410
	atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
						    CPUSTAT_SM |
2411 2412
						    CPUSTAT_STOPPED);

2413
	if (test_kvm_facility(vcpu->kvm, 78))
2414
		atomic_or(CPUSTAT_GED2, &vcpu->arch.sie_block->cpuflags);
2415
	else if (test_kvm_facility(vcpu->kvm, 8))
2416
		atomic_or(CPUSTAT_GED, &vcpu->arch.sie_block->cpuflags);
2417

2418 2419
	kvm_s390_vcpu_setup_model(vcpu);

2420 2421
	/* pgste_set_pte has special handling for !MACHINE_HAS_ESOP */
	if (MACHINE_HAS_ESOP)
2422
		vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT;
2423
	if (test_kvm_facility(vcpu->kvm, 9))
2424
		vcpu->arch.sie_block->ecb |= ECB_SRSI;
2425
	if (test_kvm_facility(vcpu->kvm, 73))
2426
		vcpu->arch.sie_block->ecb |= ECB_TE;
2427

2428
	if (test_kvm_facility(vcpu->kvm, 8) && sclp.has_pfmfi)
2429
		vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI;
2430
	if (test_kvm_facility(vcpu->kvm, 130))
2431 2432
		vcpu->arch.sie_block->ecb2 |= ECB2_IEP;
	vcpu->arch.sie_block->eca = ECA_MVPGI | ECA_PROTEXCI;
2433
	if (sclp.has_cei)
2434
		vcpu->arch.sie_block->eca |= ECA_CEI;
2435
	if (sclp.has_ib)
2436
		vcpu->arch.sie_block->eca |= ECA_IB;
2437
	if (sclp.has_siif)
2438
		vcpu->arch.sie_block->eca |= ECA_SII;
2439
	if (sclp.has_sigpif)
2440
		vcpu->arch.sie_block->eca |= ECA_SIGPI;
2441
	if (test_kvm_facility(vcpu->kvm, 129)) {
2442 2443
		vcpu->arch.sie_block->eca |= ECA_VX;
		vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
2444
	}
2445 2446 2447
	if (test_kvm_facility(vcpu->kvm, 139))
		vcpu->arch.sie_block->ecd |= ECD_MEF;

F
Fan Zhang 已提交
2448 2449
	vcpu->arch.sie_block->sdnxo = ((unsigned long) &vcpu->run->s.regs.sdnx)
					| SDNXC;
2450
	vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb;
2451 2452 2453 2454 2455

	if (sclp.has_kss)
		atomic_or(CPUSTAT_KSS, &vcpu->arch.sie_block->cpuflags);
	else
		vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
2456

2457
	if (vcpu->kvm->arch.use_cmma) {
2458 2459 2460
		rc = kvm_s390_vcpu_setup_cmma(vcpu);
		if (rc)
			return rc;
2461
	}
2462
	hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
2463
	vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
2464

2465 2466
	kvm_s390_vcpu_crypto_setup(vcpu);

2467
	return rc;
2468 2469 2470 2471 2472
}

struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
				      unsigned int id)
{
2473
	struct kvm_vcpu *vcpu;
2474
	struct sie_page *sie_page;
2475 2476
	int rc = -EINVAL;

2477
	if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id))
2478 2479 2480
		goto out;

	rc = -ENOMEM;
2481

2482
	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
2483
	if (!vcpu)
2484
		goto out;
2485

2486
	BUILD_BUG_ON(sizeof(struct sie_page) != 4096);
2487 2488
	sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL);
	if (!sie_page)
2489 2490
		goto out_free_cpu;

2491 2492 2493
	vcpu->arch.sie_block = &sie_page->sie_block;
	vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb;

2494 2495 2496 2497
	/* the real guest size will always be smaller than msl */
	vcpu->arch.sie_block->mso = 0;
	vcpu->arch.sie_block->msl = sclp.hamax;

2498
	vcpu->arch.sie_block->icpua = id;
2499 2500
	spin_lock_init(&vcpu->arch.local_int.lock);
	vcpu->arch.local_int.float_int = &kvm->arch.float_int;
2501
	vcpu->arch.local_int.wq = &vcpu->wq;
2502
	vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags;
2503
	seqcount_init(&vcpu->arch.cputm_seqcount);
2504

2505 2506
	rc = kvm_vcpu_init(vcpu, kvm, id);
	if (rc)
2507
		goto out_free_sie_block;
2508
	VM_EVENT(kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK", id, vcpu,
2509
		 vcpu->arch.sie_block);
2510
	trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);
2511 2512

	return vcpu;
2513 2514
out_free_sie_block:
	free_page((unsigned long)(vcpu->arch.sie_block));
2515
out_free_cpu:
2516
	kmem_cache_free(kvm_vcpu_cache, vcpu);
2517
out:
2518 2519 2520 2521 2522
	return ERR_PTR(rc);
}

int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
2523
	return kvm_s390_vcpu_has_irq(vcpu, 0);
2524 2525
}

2526 2527
bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
{
2528
	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE);
2529 2530
}

2531
void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu)
2532
{
2533
	atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
2534
	exit_sie(vcpu);
2535 2536
}

2537
void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu)
2538
{
2539
	atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
2540 2541
}

2542 2543
static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu)
{
2544
	atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
2545
	exit_sie(vcpu);
2546 2547 2548 2549
}

static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu)
{
2550
	atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
2551 2552
}

2553 2554 2555 2556 2557 2558
/*
 * Kick a guest cpu out of SIE and wait until SIE is not running.
 * If the CPU is not running (e.g. waiting as idle) the function will
 * return immediately. */
void exit_sie(struct kvm_vcpu *vcpu)
{
2559
	atomic_or(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags);
2560 2561 2562 2563
	while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE)
		cpu_relax();
}

2564 2565
/* Kick a guest cpu out of SIE to process a request synchronously */
void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu)
2566
{
2567 2568
	kvm_make_request(req, vcpu);
	kvm_s390_vcpu_request(vcpu);
2569 2570
}

2571 2572
static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
			      unsigned long end)
2573 2574 2575
{
	struct kvm *kvm = gmap->private;
	struct kvm_vcpu *vcpu;
2576 2577
	unsigned long prefix;
	int i;
2578

2579 2580
	if (gmap_is_shadow(gmap))
		return;
2581 2582 2583
	if (start >= 1UL << 31)
		/* We are only interested in prefix pages */
		return;
2584 2585
	kvm_for_each_vcpu(i, vcpu, kvm) {
		/* match against both prefix pages */
2586 2587 2588 2589
		prefix = kvm_s390_get_prefix(vcpu);
		if (prefix <= end && start <= prefix + 2*PAGE_SIZE - 1) {
			VCPU_EVENT(vcpu, 2, "gmap notifier for %lx-%lx",
				   start, end);
2590
			kvm_s390_sync_request(KVM_REQ_MMU_RELOAD, vcpu);
2591 2592 2593 2594
		}
	}
}

2595 2596 2597 2598 2599 2600 2601
int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
{
	/* kvm common code refers to this, but never calls it */
	BUG();
	return 0;
}

2602 2603 2604 2605 2606 2607
static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
					   struct kvm_one_reg *reg)
{
	int r = -EINVAL;

	switch (reg->id) {
2608 2609 2610 2611 2612 2613 2614 2615
	case KVM_REG_S390_TODPR:
		r = put_user(vcpu->arch.sie_block->todpr,
			     (u32 __user *)reg->addr);
		break;
	case KVM_REG_S390_EPOCHDIFF:
		r = put_user(vcpu->arch.sie_block->epoch,
			     (u64 __user *)reg->addr);
		break;
2616
	case KVM_REG_S390_CPU_TIMER:
2617
		r = put_user(kvm_s390_get_cpu_timer(vcpu),
2618 2619 2620 2621 2622 2623
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_CLOCK_COMP:
		r = put_user(vcpu->arch.sie_block->ckc,
			     (u64 __user *)reg->addr);
		break;
2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635
	case KVM_REG_S390_PFTOKEN:
		r = put_user(vcpu->arch.pfault_token,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_PFCOMPARE:
		r = put_user(vcpu->arch.pfault_compare,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_PFSELECT:
		r = put_user(vcpu->arch.pfault_select,
			     (u64 __user *)reg->addr);
		break;
2636 2637 2638 2639
	case KVM_REG_S390_PP:
		r = put_user(vcpu->arch.sie_block->pp,
			     (u64 __user *)reg->addr);
		break;
2640 2641 2642 2643
	case KVM_REG_S390_GBEA:
		r = put_user(vcpu->arch.sie_block->gbea,
			     (u64 __user *)reg->addr);
		break;
2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654
	default:
		break;
	}

	return r;
}

static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
					   struct kvm_one_reg *reg)
{
	int r = -EINVAL;
2655
	__u64 val;
2656 2657

	switch (reg->id) {
2658 2659 2660 2661 2662 2663 2664 2665
	case KVM_REG_S390_TODPR:
		r = get_user(vcpu->arch.sie_block->todpr,
			     (u32 __user *)reg->addr);
		break;
	case KVM_REG_S390_EPOCHDIFF:
		r = get_user(vcpu->arch.sie_block->epoch,
			     (u64 __user *)reg->addr);
		break;
2666
	case KVM_REG_S390_CPU_TIMER:
2667 2668 2669
		r = get_user(val, (u64 __user *)reg->addr);
		if (!r)
			kvm_s390_set_cpu_timer(vcpu, val);
2670 2671 2672 2673 2674
		break;
	case KVM_REG_S390_CLOCK_COMP:
		r = get_user(vcpu->arch.sie_block->ckc,
			     (u64 __user *)reg->addr);
		break;
2675 2676 2677
	case KVM_REG_S390_PFTOKEN:
		r = get_user(vcpu->arch.pfault_token,
			     (u64 __user *)reg->addr);
2678 2679
		if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
			kvm_clear_async_pf_completion_queue(vcpu);
2680 2681 2682 2683 2684 2685 2686 2687 2688
		break;
	case KVM_REG_S390_PFCOMPARE:
		r = get_user(vcpu->arch.pfault_compare,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_PFSELECT:
		r = get_user(vcpu->arch.pfault_select,
			     (u64 __user *)reg->addr);
		break;
2689 2690 2691 2692
	case KVM_REG_S390_PP:
		r = get_user(vcpu->arch.sie_block->pp,
			     (u64 __user *)reg->addr);
		break;
2693 2694 2695 2696
	case KVM_REG_S390_GBEA:
		r = get_user(vcpu->arch.sie_block->gbea,
			     (u64 __user *)reg->addr);
		break;
2697 2698 2699 2700 2701 2702
	default:
		break;
	}

	return r;
}
2703

2704 2705 2706 2707 2708 2709 2710 2711
static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
{
	kvm_s390_vcpu_initial_reset(vcpu);
	return 0;
}

int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
2712
	memcpy(&vcpu->run->s.regs.gprs, &regs->gprs, sizeof(regs->gprs));
2713 2714 2715 2716 2717
	return 0;
}

int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
2718
	memcpy(&regs->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
2719 2720 2721 2722 2723 2724
	return 0;
}

int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs)
{
2725
	memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
2726 2727 2728 2729 2730 2731 2732
	memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
	return 0;
}

int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs)
{
2733
	memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
2734 2735 2736 2737 2738 2739
	memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));
	return 0;
}

int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
2740 2741
	if (test_fp_ctl(fpu->fpc))
		return -EINVAL;
2742
	vcpu->run->s.regs.fpc = fpu->fpc;
2743
	if (MACHINE_HAS_VX)
2744 2745
		convert_fp_to_vx((__vector128 *) vcpu->run->s.regs.vrs,
				 (freg_t *) fpu->fprs);
2746
	else
2747
		memcpy(vcpu->run->s.regs.fprs, &fpu->fprs, sizeof(fpu->fprs));
2748 2749 2750 2751 2752
	return 0;
}

int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
2753 2754 2755
	/* make sure we have the latest values */
	save_fpu_regs();
	if (MACHINE_HAS_VX)
2756 2757
		convert_vx_to_fp((freg_t *) fpu->fprs,
				 (__vector128 *) vcpu->run->s.regs.vrs);
2758
	else
2759
		memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs));
2760
	fpu->fpc = vcpu->run->s.regs.fpc;
2761 2762 2763 2764 2765 2766 2767
	return 0;
}

static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
{
	int rc = 0;

2768
	if (!is_vcpu_stopped(vcpu))
2769
		rc = -EBUSY;
2770 2771 2772 2773
	else {
		vcpu->run->psw_mask = psw.mask;
		vcpu->run->psw_addr = psw.addr;
	}
2774 2775 2776 2777 2778 2779 2780 2781 2782
	return rc;
}

int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
				  struct kvm_translation *tr)
{
	return -EINVAL; /* not implemented yet */
}

2783 2784 2785 2786
#define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \
			      KVM_GUESTDBG_USE_HW_BP | \
			      KVM_GUESTDBG_ENABLE)

J
Jan Kiszka 已提交
2787 2788
int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
					struct kvm_guest_debug *dbg)
2789
{
2790 2791 2792 2793 2794
	int rc = 0;

	vcpu->guest_debug = 0;
	kvm_s390_clear_bp_data(vcpu);

2795
	if (dbg->control & ~VALID_GUESTDBG_FLAGS)
2796
		return -EINVAL;
2797 2798
	if (!sclp.has_gpere)
		return -EINVAL;
2799 2800 2801 2802

	if (dbg->control & KVM_GUESTDBG_ENABLE) {
		vcpu->guest_debug = dbg->control;
		/* enforce guest PER */
2803
		atomic_or(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2804 2805 2806 2807

		if (dbg->control & KVM_GUESTDBG_USE_HW_BP)
			rc = kvm_s390_import_bp_data(vcpu, dbg);
	} else {
2808
		atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2809 2810 2811 2812 2813 2814
		vcpu->arch.guestdbg.last_bp = 0;
	}

	if (rc) {
		vcpu->guest_debug = 0;
		kvm_s390_clear_bp_data(vcpu);
2815
		atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2816 2817 2818
	}

	return rc;
2819 2820
}

2821 2822 2823
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
				    struct kvm_mp_state *mp_state)
{
2824 2825 2826
	/* CHECK_STOP and LOAD are not supported yet */
	return is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED :
				       KVM_MP_STATE_OPERATING;
2827 2828 2829 2830 2831
}

int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
				    struct kvm_mp_state *mp_state)
{
2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851
	int rc = 0;

	/* user space knows about this interface - let it control the state */
	vcpu->kvm->arch.user_cpu_state_ctrl = 1;

	switch (mp_state->mp_state) {
	case KVM_MP_STATE_STOPPED:
		kvm_s390_vcpu_stop(vcpu);
		break;
	case KVM_MP_STATE_OPERATING:
		kvm_s390_vcpu_start(vcpu);
		break;
	case KVM_MP_STATE_LOAD:
	case KVM_MP_STATE_CHECK_STOP:
		/* fall through - CHECK_STOP and LOAD are not supported yet */
	default:
		rc = -ENXIO;
	}

	return rc;
2852 2853
}

2854 2855 2856 2857 2858
static bool ibs_enabled(struct kvm_vcpu *vcpu)
{
	return atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_IBS;
}

2859 2860
static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
{
2861
retry:
2862
	kvm_s390_vcpu_request_handled(vcpu);
R
Radim Krčmář 已提交
2863
	if (!kvm_request_pending(vcpu))
2864
		return 0;
2865 2866
	/*
	 * We use MMU_RELOAD just to re-arm the ipte notifier for the
2867
	 * guest prefix page. gmap_mprotect_notify will wait on the ptl lock.
2868 2869 2870 2871
	 * This ensures that the ipte instruction for this request has
	 * already finished. We might race against a second unmapper that
	 * wants to set the blocking bit. Lets just retry the request loop.
	 */
2872
	if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) {
2873
		int rc;
2874 2875 2876
		rc = gmap_mprotect_notify(vcpu->arch.gmap,
					  kvm_s390_get_prefix(vcpu),
					  PAGE_SIZE * 2, PROT_WRITE);
2877 2878
		if (rc) {
			kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
2879
			return rc;
2880
		}
2881
		goto retry;
2882
	}
2883

2884 2885 2886 2887 2888
	if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
		vcpu->arch.sie_block->ihcpu = 0xffff;
		goto retry;
	}

2889 2890 2891
	if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) {
		if (!ibs_enabled(vcpu)) {
			trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1);
2892
			atomic_or(CPUSTAT_IBS,
2893 2894 2895
					&vcpu->arch.sie_block->cpuflags);
		}
		goto retry;
2896
	}
2897 2898 2899 2900

	if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) {
		if (ibs_enabled(vcpu)) {
			trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0);
2901
			atomic_andnot(CPUSTAT_IBS,
2902 2903 2904 2905 2906
					  &vcpu->arch.sie_block->cpuflags);
		}
		goto retry;
	}

2907 2908 2909 2910 2911
	if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) {
		vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
		goto retry;
	}

2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932
	if (kvm_check_request(KVM_REQ_START_MIGRATION, vcpu)) {
		/*
		 * Disable CMMA virtualization; we will emulate the ESSA
		 * instruction manually, in order to provide additional
		 * functionalities needed for live migration.
		 */
		vcpu->arch.sie_block->ecb2 &= ~ECB2_CMMA;
		goto retry;
	}

	if (kvm_check_request(KVM_REQ_STOP_MIGRATION, vcpu)) {
		/*
		 * Re-enable CMMA virtualization if CMMA is available and
		 * was used.
		 */
		if ((vcpu->kvm->arch.use_cmma) &&
		    (vcpu->kvm->mm->context.use_cmma))
			vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
		goto retry;
	}

2933
	/* nothing to do, just clear the request */
2934
	kvm_clear_request(KVM_REQ_UNHALT, vcpu);
2935

2936 2937 2938
	return 0;
}

2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967
void kvm_s390_set_tod_clock_ext(struct kvm *kvm,
				 const struct kvm_s390_vm_tod_clock *gtod)
{
	struct kvm_vcpu *vcpu;
	struct kvm_s390_tod_clock_ext htod;
	int i;

	mutex_lock(&kvm->lock);
	preempt_disable();

	get_tod_clock_ext((char *)&htod);

	kvm->arch.epoch = gtod->tod - htod.tod;
	kvm->arch.epdx = gtod->epoch_idx - htod.epoch_idx;

	if (kvm->arch.epoch > gtod->tod)
		kvm->arch.epdx -= 1;

	kvm_s390_vcpu_block_all(kvm);
	kvm_for_each_vcpu(i, vcpu, kvm) {
		vcpu->arch.sie_block->epoch = kvm->arch.epoch;
		vcpu->arch.sie_block->epdx  = kvm->arch.epdx;
	}

	kvm_s390_vcpu_unblock_all(kvm);
	preempt_enable();
	mutex_unlock(&kvm->lock);
}

2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983
void kvm_s390_set_tod_clock(struct kvm *kvm, u64 tod)
{
	struct kvm_vcpu *vcpu;
	int i;

	mutex_lock(&kvm->lock);
	preempt_disable();
	kvm->arch.epoch = tod - get_tod_clock();
	kvm_s390_vcpu_block_all(kvm);
	kvm_for_each_vcpu(i, vcpu, kvm)
		vcpu->arch.sie_block->epoch = kvm->arch.epoch;
	kvm_s390_vcpu_unblock_all(kvm);
	preempt_enable();
	mutex_unlock(&kvm->lock);
}

2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994
/**
 * kvm_arch_fault_in_page - fault-in guest page if necessary
 * @vcpu: The corresponding virtual cpu
 * @gpa: Guest physical address
 * @writable: Whether the page should be writable or not
 *
 * Make sure that a guest page has been faulted-in on the host.
 *
 * Return: Zero on success, negative error code otherwise.
 */
long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable)
2995
{
2996 2997
	return gmap_fault(vcpu->arch.gmap, gpa,
			  writable ? FAULT_FLAG_WRITE : 0);
2998 2999
}

3000 3001 3002 3003
static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token,
				      unsigned long token)
{
	struct kvm_s390_interrupt inti;
3004
	struct kvm_s390_irq irq;
3005 3006

	if (start_token) {
3007 3008 3009
		irq.u.ext.ext_params2 = token;
		irq.type = KVM_S390_INT_PFAULT_INIT;
		WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq));
3010 3011
	} else {
		inti.type = KVM_S390_INT_PFAULT_DONE;
3012
		inti.parm64 = token;
3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058
		WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti));
	}
}

void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
				     struct kvm_async_pf *work)
{
	trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token);
	__kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token);
}

void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
				 struct kvm_async_pf *work)
{
	trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token);
	__kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token);
}

void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu,
			       struct kvm_async_pf *work)
{
	/* s390 will always inject the page directly */
}

bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)
{
	/*
	 * s390 will always inject the page directly,
	 * but we still want check_async_completion to cleanup
	 */
	return true;
}

static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu)
{
	hva_t hva;
	struct kvm_arch_async_pf arch;
	int rc;

	if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
		return 0;
	if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) !=
	    vcpu->arch.pfault_compare)
		return 0;
	if (psw_extint_disabled(vcpu))
		return 0;
3059
	if (kvm_s390_vcpu_has_irq(vcpu, 0))
3060 3061 3062 3063 3064 3065
		return 0;
	if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
		return 0;
	if (!vcpu->arch.gmap->pfault_enabled)
		return 0;

H
Heiko Carstens 已提交
3066 3067 3068
	hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr));
	hva += current->thread.gmap_addr & ~PAGE_MASK;
	if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8))
3069 3070 3071 3072 3073 3074
		return 0;

	rc = kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch);
	return rc;
}

3075
static int vcpu_pre_run(struct kvm_vcpu *vcpu)
3076
{
3077
	int rc, cpuflags;
3078

3079 3080 3081 3082 3083 3084 3085
	/*
	 * On s390 notifications for arriving pages will be delivered directly
	 * to the guest but the house keeping for completed pfaults is
	 * handled outside the worker.
	 */
	kvm_check_async_pf_completion(vcpu);

3086 3087
	vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14];
	vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15];
3088 3089 3090 3091

	if (need_resched())
		schedule();

3092
	if (test_cpu_flag(CIF_MCCK_PENDING))
3093 3094
		s390_handle_mcck();

3095 3096 3097 3098 3099
	if (!kvm_is_ucontrol(vcpu->kvm)) {
		rc = kvm_s390_deliver_pending_interrupts(vcpu);
		if (rc)
			return rc;
	}
C
Carsten Otte 已提交
3100

3101 3102 3103 3104
	rc = kvm_s390_handle_requests(vcpu);
	if (rc)
		return rc;

3105 3106 3107 3108 3109
	if (guestdbg_enabled(vcpu)) {
		kvm_s390_backup_guest_per_regs(vcpu);
		kvm_s390_patch_guest_per_regs(vcpu);
	}

3110
	vcpu->arch.sie_block->icptcode = 0;
3111 3112 3113
	cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
	VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags);
	trace_kvm_s390_sie_enter(vcpu, cpuflags);
3114

3115 3116 3117
	return 0;
}

3118 3119
static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu)
{
3120 3121 3122 3123
	struct kvm_s390_pgm_info pgm_info = {
		.code = PGM_ADDRESSING,
	};
	u8 opcode, ilen;
3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136
	int rc;

	VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
	trace_kvm_s390_sie_fault(vcpu);

	/*
	 * We want to inject an addressing exception, which is defined as a
	 * suppressing or terminating exception. However, since we came here
	 * by a DAT access exception, the PSW still points to the faulting
	 * instruction since DAT exceptions are nullifying. So we've got
	 * to look up the current opcode to get the length of the instruction
	 * to be able to forward the PSW.
	 */
3137
	rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1);
3138
	ilen = insn_length(opcode);
3139 3140 3141 3142 3143 3144 3145 3146 3147 3148
	if (rc < 0) {
		return rc;
	} else if (rc) {
		/* Instruction-Fetching Exceptions - we can't detect the ilen.
		 * Forward by arbitrary ilc, injection will take care of
		 * nullification if necessary.
		 */
		pgm_info = vcpu->arch.pgm;
		ilen = 4;
	}
3149 3150 3151
	pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID;
	kvm_s390_forward_psw(vcpu, ilen);
	return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
3152 3153
}

3154 3155
static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason)
{
3156 3157 3158
	struct mcck_volatile_info *mcck_info;
	struct sie_page *sie_page;

3159 3160 3161 3162
	VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
		   vcpu->arch.sie_block->icptcode);
	trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);

3163 3164 3165
	if (guestdbg_enabled(vcpu))
		kvm_s390_restore_guest_per_regs(vcpu);

3166 3167
	vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14;
	vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15;
3168

3169 3170 3171 3172 3173 3174 3175 3176 3177
	if (exit_reason == -EINTR) {
		VCPU_EVENT(vcpu, 3, "%s", "machine check");
		sie_page = container_of(vcpu->arch.sie_block,
					struct sie_page, sie_block);
		mcck_info = &sie_page->mcck_info;
		kvm_s390_reinject_machine_check(vcpu, mcck_info);
		return 0;
	}

3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190
	if (vcpu->arch.sie_block->icptcode > 0) {
		int rc = kvm_handle_sie_intercept(vcpu);

		if (rc != -EOPNOTSUPP)
			return rc;
		vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC;
		vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
		vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
		vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
		return -EREMOTE;
	} else if (exit_reason != -EFAULT) {
		vcpu->stat.exit_null++;
		return 0;
3191 3192 3193 3194 3195
	} else if (kvm_is_ucontrol(vcpu->kvm)) {
		vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL;
		vcpu->run->s390_ucontrol.trans_exc_code =
						current->thread.gmap_addr;
		vcpu->run->s390_ucontrol.pgm_code = 0x10;
3196
		return -EREMOTE;
3197
	} else if (current->thread.gmap_pfault) {
3198
		trace_kvm_s390_major_guest_pfault(vcpu);
3199
		current->thread.gmap_pfault = 0;
3200 3201 3202
		if (kvm_arch_setup_async_pf(vcpu))
			return 0;
		return kvm_arch_fault_in_page(vcpu, current->thread.gmap_addr, 1);
3203
	}
3204
	return vcpu_post_run_fault_in_sie(vcpu);
3205 3206 3207 3208 3209 3210
}

static int __vcpu_run(struct kvm_vcpu *vcpu)
{
	int rc, exit_reason;

3211 3212 3213 3214 3215 3216
	/*
	 * We try to hold kvm->srcu during most of vcpu_run (except when run-
	 * ning the guest), so that memslots (and other stuff) are protected
	 */
	vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);

3217 3218 3219 3220
	do {
		rc = vcpu_pre_run(vcpu);
		if (rc)
			break;
3221

3222
		srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
3223 3224 3225 3226
		/*
		 * As PF_VCPU will be used in fault handler, between
		 * guest_enter and guest_exit should be no uaccess.
		 */
3227
		local_irq_disable();
3228
		guest_enter_irqoff();
3229
		__disable_cpu_timer_accounting(vcpu);
3230
		local_irq_enable();
3231 3232
		exit_reason = sie64a(vcpu->arch.sie_block,
				     vcpu->run->s.regs.gprs);
3233
		local_irq_disable();
3234
		__enable_cpu_timer_accounting(vcpu);
3235
		guest_exit_irqoff();
3236
		local_irq_enable();
3237
		vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
3238 3239

		rc = vcpu_post_run(vcpu, exit_reason);
3240
	} while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc);
3241

3242
	srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
3243
	return rc;
3244 3245
}

3246 3247
static void sync_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
3248
	struct runtime_instr_cb *riccb;
F
Fan Zhang 已提交
3249
	struct gs_cb *gscb;
3250 3251

	riccb = (struct runtime_instr_cb *) &kvm_run->s.regs.riccb;
F
Fan Zhang 已提交
3252
	gscb = (struct gs_cb *) &kvm_run->s.regs.gscb;
3253 3254 3255 3256 3257 3258
	vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
	vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
	if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX)
		kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
	if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) {
		memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128);
3259 3260
		/* some control register changes require a tlb flush */
		kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
3261 3262
	}
	if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
3263
		kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm);
3264 3265 3266 3267 3268 3269 3270 3271 3272
		vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc;
		vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr;
		vcpu->arch.sie_block->pp = kvm_run->s.regs.pp;
		vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea;
	}
	if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) {
		vcpu->arch.pfault_token = kvm_run->s.regs.pft;
		vcpu->arch.pfault_select = kvm_run->s.regs.pfs;
		vcpu->arch.pfault_compare = kvm_run->s.regs.pfc;
3273 3274
		if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
			kvm_clear_async_pf_completion_queue(vcpu);
3275
	}
F
Fan Zhang 已提交
3276 3277 3278 3279 3280
	/*
	 * If userspace sets the riccb (e.g. after migration) to a valid state,
	 * we should enable RI here instead of doing the lazy enablement.
	 */
	if ((kvm_run->kvm_dirty_regs & KVM_SYNC_RICCB) &&
3281
	    test_kvm_facility(vcpu->kvm, 64) &&
3282
	    riccb->v &&
3283
	    !(vcpu->arch.sie_block->ecb3 & ECB3_RI)) {
3284
		VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (sync_regs)");
3285
		vcpu->arch.sie_block->ecb3 |= ECB3_RI;
F
Fan Zhang 已提交
3286
	}
F
Fan Zhang 已提交
3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298
	/*
	 * If userspace sets the gscb (e.g. after migration) to non-zero,
	 * we should enable GS here instead of doing the lazy enablement.
	 */
	if ((kvm_run->kvm_dirty_regs & KVM_SYNC_GSCB) &&
	    test_kvm_facility(vcpu->kvm, 133) &&
	    gscb->gssm &&
	    !vcpu->arch.gs_enabled) {
		VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (sync_regs)");
		vcpu->arch.sie_block->ecb |= ECB_GS;
		vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
		vcpu->arch.gs_enabled = 1;
F
Fan Zhang 已提交
3299
	}
3300 3301
	save_access_regs(vcpu->arch.host_acrs);
	restore_access_regs(vcpu->run->s.regs.acrs);
3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313
	/* save host (userspace) fprs/vrs */
	save_fpu_regs();
	vcpu->arch.host_fpregs.fpc = current->thread.fpu.fpc;
	vcpu->arch.host_fpregs.regs = current->thread.fpu.regs;
	if (MACHINE_HAS_VX)
		current->thread.fpu.regs = vcpu->run->s.regs.vrs;
	else
		current->thread.fpu.regs = vcpu->run->s.regs.fprs;
	current->thread.fpu.fpc = vcpu->run->s.regs.fpc;
	if (test_fp_ctl(current->thread.fpu.fpc))
		/* User space provided an invalid FPC, let's clear it */
		current->thread.fpu.fpc = 0;
F
Fan Zhang 已提交
3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327
	if (MACHINE_HAS_GS) {
		preempt_disable();
		__ctl_set_bit(2, 4);
		if (current->thread.gs_cb) {
			vcpu->arch.host_gscb = current->thread.gs_cb;
			save_gs_cb(vcpu->arch.host_gscb);
		}
		if (vcpu->arch.gs_enabled) {
			current->thread.gs_cb = (struct gs_cb *)
						&vcpu->run->s.regs.gscb;
			restore_gs_cb(current->thread.gs_cb);
		}
		preempt_enable();
	}
F
Fan Zhang 已提交
3328

3329 3330 3331 3332 3333 3334 3335 3336 3337
	kvm_run->kvm_dirty_regs = 0;
}

static void store_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
	kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
	kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu);
	memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
3338
	kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu);
3339 3340 3341 3342 3343 3344 3345
	kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc;
	kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr;
	kvm_run->s.regs.pp = vcpu->arch.sie_block->pp;
	kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea;
	kvm_run->s.regs.pft = vcpu->arch.pfault_token;
	kvm_run->s.regs.pfs = vcpu->arch.pfault_select;
	kvm_run->s.regs.pfc = vcpu->arch.pfault_compare;
3346 3347
	save_access_regs(vcpu->run->s.regs.acrs);
	restore_access_regs(vcpu->arch.host_acrs);
3348 3349 3350 3351 3352 3353
	/* Save guest register state */
	save_fpu_regs();
	vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
	/* Restore will be done lazily at return */
	current->thread.fpu.fpc = vcpu->arch.host_fpregs.fpc;
	current->thread.fpu.regs = vcpu->arch.host_fpregs.regs;
F
Fan Zhang 已提交
3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365
	if (MACHINE_HAS_GS) {
		__ctl_set_bit(2, 4);
		if (vcpu->arch.gs_enabled)
			save_gs_cb(current->thread.gs_cb);
		preempt_disable();
		current->thread.gs_cb = vcpu->arch.host_gscb;
		restore_gs_cb(vcpu->arch.host_gscb);
		preempt_enable();
		if (!vcpu->arch.host_gscb)
			__ctl_clear_bit(2, 4);
		vcpu->arch.host_gscb = NULL;
	}
3366

3367 3368
}

3369 3370
int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
3371
	int rc;
3372 3373
	sigset_t sigsaved;

3374 3375 3376
	if (kvm_run->immediate_exit)
		return -EINTR;

3377 3378 3379 3380 3381
	if (guestdbg_exit_pending(vcpu)) {
		kvm_s390_prepare_debug_exit(vcpu);
		return 0;
	}

3382 3383 3384
	if (vcpu->sigset_active)
		sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);

3385 3386 3387
	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) {
		kvm_s390_vcpu_start(vcpu);
	} else if (is_vcpu_stopped(vcpu)) {
3388
		pr_err_ratelimited("can't run stopped vcpu %d\n",
3389 3390 3391
				   vcpu->vcpu_id);
		return -EINVAL;
	}
3392

3393
	sync_regs(vcpu, kvm_run);
3394
	enable_cpu_timer_accounting(vcpu);
3395

3396
	might_fault();
3397
	rc = __vcpu_run(vcpu);
3398

3399 3400
	if (signal_pending(current) && !rc) {
		kvm_run->exit_reason = KVM_EXIT_INTR;
3401
		rc = -EINTR;
3402
	}
3403

3404 3405 3406 3407 3408
	if (guestdbg_exit_pending(vcpu) && !rc)  {
		kvm_s390_prepare_debug_exit(vcpu);
		rc = 0;
	}

3409
	if (rc == -EREMOTE) {
3410
		/* userspace support is needed, kvm_run has been prepared */
3411 3412
		rc = 0;
	}
3413

3414
	disable_cpu_timer_accounting(vcpu);
3415
	store_regs(vcpu, kvm_run);
3416

3417 3418 3419 3420
	if (vcpu->sigset_active)
		sigprocmask(SIG_SETMASK, &sigsaved, NULL);

	vcpu->stat.exit_userspace++;
3421
	return rc;
3422 3423 3424 3425 3426 3427 3428 3429
}

/*
 * store status at address
 * we use have two special cases:
 * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit
 * KVM_S390_STORE_STATUS_PREFIXED: -> prefix
 */
3430
int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa)
3431
{
3432
	unsigned char archmode = 1;
3433
	freg_t fprs[NUM_FPRS];
3434
	unsigned int px;
3435
	u64 clkcomp, cputm;
3436
	int rc;
3437

3438
	px = kvm_s390_get_prefix(vcpu);
3439 3440
	if (gpa == KVM_S390_STORE_STATUS_NOADDR) {
		if (write_guest_abs(vcpu, 163, &archmode, 1))
3441
			return -EFAULT;
3442
		gpa = 0;
3443 3444
	} else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) {
		if (write_guest_real(vcpu, 163, &archmode, 1))
3445
			return -EFAULT;
3446 3447 3448
		gpa = px;
	} else
		gpa -= __LC_FPREGS_SAVE_AREA;
3449 3450 3451

	/* manually convert vector registers if necessary */
	if (MACHINE_HAS_VX) {
3452
		convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
3453 3454 3455 3456
		rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
				     fprs, 128);
	} else {
		rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
3457
				     vcpu->run->s.regs.fprs, 128);
3458
	}
3459
	rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA,
3460
			      vcpu->run->s.regs.gprs, 128);
3461
	rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA,
3462
			      &vcpu->arch.sie_block->gpsw, 16);
3463
	rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA,
3464
			      &px, 4);
3465
	rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA,
3466
			      &vcpu->run->s.regs.fpc, 4);
3467
	rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA,
3468
			      &vcpu->arch.sie_block->todpr, 4);
3469
	cputm = kvm_s390_get_cpu_timer(vcpu);
3470
	rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA,
3471
			      &cputm, 8);
3472
	clkcomp = vcpu->arch.sie_block->ckc >> 8;
3473
	rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA,
3474
			      &clkcomp, 8);
3475
	rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA,
3476
			      &vcpu->run->s.regs.acrs, 64);
3477
	rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA,
3478 3479
			      &vcpu->arch.sie_block->gcr, 128);
	return rc ? -EFAULT : 0;
3480 3481
}

3482 3483 3484 3485
int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
{
	/*
	 * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy
3486
	 * switch in the run ioctl. Let's update our copies before we save
3487 3488
	 * it into the save area
	 */
3489
	save_fpu_regs();
3490
	vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
3491 3492 3493 3494 3495
	save_access_regs(vcpu->run->s.regs.acrs);

	return kvm_s390_store_status_unloaded(vcpu, addr);
}

3496 3497 3498
static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
{
	kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu);
3499
	kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu);
3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513
}

static void __disable_ibs_on_all_vcpus(struct kvm *kvm)
{
	unsigned int i;
	struct kvm_vcpu *vcpu;

	kvm_for_each_vcpu(i, vcpu, kvm) {
		__disable_ibs_on_vcpu(vcpu);
	}
}

static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
{
3514 3515
	if (!sclp.has_ibs)
		return;
3516
	kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu);
3517
	kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu);
3518 3519
}

3520 3521
void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu)
{
3522 3523 3524 3525 3526
	int i, online_vcpus, started_vcpus = 0;

	if (!is_vcpu_stopped(vcpu))
		return;

3527
	trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1);
3528
	/* Only one cpu at a time may enter/leave the STOPPED state. */
3529
	spin_lock(&vcpu->kvm->arch.start_stop_lock);
3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548
	online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);

	for (i = 0; i < online_vcpus; i++) {
		if (!is_vcpu_stopped(vcpu->kvm->vcpus[i]))
			started_vcpus++;
	}

	if (started_vcpus == 0) {
		/* we're the only active VCPU -> speed it up */
		__enable_ibs_on_vcpu(vcpu);
	} else if (started_vcpus == 1) {
		/*
		 * As we are starting a second VCPU, we have to disable
		 * the IBS facility on all VCPUs to remove potentially
		 * oustanding ENABLE requests.
		 */
		__disable_ibs_on_all_vcpus(vcpu->kvm);
	}

3549
	atomic_andnot(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
3550 3551 3552 3553
	/*
	 * Another VCPU might have used IBS while we were offline.
	 * Let's play safe and flush the VCPU at startup.
	 */
3554
	kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
3555
	spin_unlock(&vcpu->kvm->arch.start_stop_lock);
3556
	return;
3557 3558 3559 3560
}

void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu)
{
3561 3562 3563 3564 3565 3566
	int i, online_vcpus, started_vcpus = 0;
	struct kvm_vcpu *started_vcpu = NULL;

	if (is_vcpu_stopped(vcpu))
		return;

3567
	trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0);
3568
	/* Only one cpu at a time may enter/leave the STOPPED state. */
3569
	spin_lock(&vcpu->kvm->arch.start_stop_lock);
3570 3571
	online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);

3572
	/* SIGP STOP and SIGP STOP AND STORE STATUS has been fully processed */
3573
	kvm_s390_clear_stop_irq(vcpu);
3574

3575
	atomic_or(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592
	__disable_ibs_on_vcpu(vcpu);

	for (i = 0; i < online_vcpus; i++) {
		if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) {
			started_vcpus++;
			started_vcpu = vcpu->kvm->vcpus[i];
		}
	}

	if (started_vcpus == 1) {
		/*
		 * As we only have one VCPU left, we want to enable the
		 * IBS facility for that VCPU to speed it up.
		 */
		__enable_ibs_on_vcpu(started_vcpu);
	}

3593
	spin_unlock(&vcpu->kvm->arch.start_stop_lock);
3594
	return;
3595 3596
}

3597 3598 3599 3600 3601 3602 3603 3604 3605
static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
				     struct kvm_enable_cap *cap)
{
	int r;

	if (cap->flags)
		return -EINVAL;

	switch (cap->cap) {
3606 3607 3608
	case KVM_CAP_S390_CSS_SUPPORT:
		if (!vcpu->kvm->arch.css_support) {
			vcpu->kvm->arch.css_support = 1;
3609
			VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support");
3610 3611 3612 3613
			trace_kvm_s390_enable_css(vcpu->kvm);
		}
		r = 0;
		break;
3614 3615 3616 3617 3618 3619 3620
	default:
		r = -EINVAL;
		break;
	}
	return r;
}

3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646
static long kvm_s390_guest_mem_op(struct kvm_vcpu *vcpu,
				  struct kvm_s390_mem_op *mop)
{
	void __user *uaddr = (void __user *)mop->buf;
	void *tmpbuf = NULL;
	int r, srcu_idx;
	const u64 supported_flags = KVM_S390_MEMOP_F_INJECT_EXCEPTION
				    | KVM_S390_MEMOP_F_CHECK_ONLY;

	if (mop->flags & ~supported_flags)
		return -EINVAL;

	if (mop->size > MEM_OP_MAX_SIZE)
		return -E2BIG;

	if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) {
		tmpbuf = vmalloc(mop->size);
		if (!tmpbuf)
			return -ENOMEM;
	}

	srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);

	switch (mop->op) {
	case KVM_S390_MEMOP_LOGICAL_READ:
		if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
3647 3648
			r = check_gva_range(vcpu, mop->gaddr, mop->ar,
					    mop->size, GACC_FETCH);
3649 3650 3651 3652 3653 3654 3655 3656 3657 3658
			break;
		}
		r = read_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size);
		if (r == 0) {
			if (copy_to_user(uaddr, tmpbuf, mop->size))
				r = -EFAULT;
		}
		break;
	case KVM_S390_MEMOP_LOGICAL_WRITE:
		if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
3659 3660
			r = check_gva_range(vcpu, mop->gaddr, mop->ar,
					    mop->size, GACC_STORE);
3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681
			break;
		}
		if (copy_from_user(tmpbuf, uaddr, mop->size)) {
			r = -EFAULT;
			break;
		}
		r = write_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size);
		break;
	default:
		r = -EINVAL;
	}

	srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);

	if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0)
		kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);

	vfree(tmpbuf);
	return r;
}

3682 3683 3684 3685 3686
long kvm_arch_vcpu_ioctl(struct file *filp,
			 unsigned int ioctl, unsigned long arg)
{
	struct kvm_vcpu *vcpu = filp->private_data;
	void __user *argp = (void __user *)arg;
3687
	int idx;
3688
	long r;
3689

3690
	switch (ioctl) {
3691 3692 3693 3694 3695 3696 3697 3698 3699
	case KVM_S390_IRQ: {
		struct kvm_s390_irq s390irq;

		r = -EFAULT;
		if (copy_from_user(&s390irq, argp, sizeof(s390irq)))
			break;
		r = kvm_s390_inject_vcpu(vcpu, &s390irq);
		break;
	}
3700
	case KVM_S390_INTERRUPT: {
3701
		struct kvm_s390_interrupt s390int;
3702
		struct kvm_s390_irq s390irq;
3703

3704
		r = -EFAULT;
3705
		if (copy_from_user(&s390int, argp, sizeof(s390int)))
3706
			break;
3707 3708 3709
		if (s390int_to_s390irq(&s390int, &s390irq))
			return -EINVAL;
		r = kvm_s390_inject_vcpu(vcpu, &s390irq);
3710
		break;
3711
	}
3712
	case KVM_S390_STORE_STATUS:
3713
		idx = srcu_read_lock(&vcpu->kvm->srcu);
3714
		r = kvm_s390_vcpu_store_status(vcpu, arg);
3715
		srcu_read_unlock(&vcpu->kvm->srcu, idx);
3716
		break;
3717 3718 3719
	case KVM_S390_SET_INITIAL_PSW: {
		psw_t psw;

3720
		r = -EFAULT;
3721
		if (copy_from_user(&psw, argp, sizeof(psw)))
3722 3723 3724
			break;
		r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
		break;
3725 3726
	}
	case KVM_S390_INITIAL_RESET:
3727 3728
		r = kvm_arch_vcpu_ioctl_initial_reset(vcpu);
		break;
3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740
	case KVM_SET_ONE_REG:
	case KVM_GET_ONE_REG: {
		struct kvm_one_reg reg;
		r = -EFAULT;
		if (copy_from_user(&reg, argp, sizeof(reg)))
			break;
		if (ioctl == KVM_SET_ONE_REG)
			r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, &reg);
		else
			r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, &reg);
		break;
	}
3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776
#ifdef CONFIG_KVM_S390_UCONTROL
	case KVM_S390_UCAS_MAP: {
		struct kvm_s390_ucas_mapping ucasmap;

		if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
			r = -EFAULT;
			break;
		}

		if (!kvm_is_ucontrol(vcpu->kvm)) {
			r = -EINVAL;
			break;
		}

		r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr,
				     ucasmap.vcpu_addr, ucasmap.length);
		break;
	}
	case KVM_S390_UCAS_UNMAP: {
		struct kvm_s390_ucas_mapping ucasmap;

		if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
			r = -EFAULT;
			break;
		}

		if (!kvm_is_ucontrol(vcpu->kvm)) {
			r = -EINVAL;
			break;
		}

		r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr,
			ucasmap.length);
		break;
	}
#endif
3777
	case KVM_S390_VCPU_FAULT: {
3778
		r = gmap_fault(vcpu->arch.gmap, arg, 0);
3779 3780
		break;
	}
3781 3782 3783 3784 3785 3786 3787 3788 3789
	case KVM_ENABLE_CAP:
	{
		struct kvm_enable_cap cap;
		r = -EFAULT;
		if (copy_from_user(&cap, argp, sizeof(cap)))
			break;
		r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
		break;
	}
3790 3791 3792 3793 3794 3795 3796 3797 3798
	case KVM_S390_MEM_OP: {
		struct kvm_s390_mem_op mem_op;

		if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0)
			r = kvm_s390_guest_mem_op(vcpu, &mem_op);
		else
			r = -EFAULT;
		break;
	}
3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810
	case KVM_S390_SET_IRQ_STATE: {
		struct kvm_s390_irq_state irq_state;

		r = -EFAULT;
		if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
			break;
		if (irq_state.len > VCPU_IRQS_MAX_BUF ||
		    irq_state.len == 0 ||
		    irq_state.len % sizeof(struct kvm_s390_irq) > 0) {
			r = -EINVAL;
			break;
		}
3811
		/* do not use irq_state.flags, it will break old QEMUs */
3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826
		r = kvm_s390_set_irq_state(vcpu,
					   (void __user *) irq_state.buf,
					   irq_state.len);
		break;
	}
	case KVM_S390_GET_IRQ_STATE: {
		struct kvm_s390_irq_state irq_state;

		r = -EFAULT;
		if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
			break;
		if (irq_state.len == 0) {
			r = -EINVAL;
			break;
		}
3827
		/* do not use irq_state.flags, it will break old QEMUs */
3828 3829 3830 3831 3832
		r = kvm_s390_get_irq_state(vcpu,
					   (__u8 __user *)  irq_state.buf,
					   irq_state.len);
		break;
	}
3833
	default:
3834
		r = -ENOTTY;
3835
	}
3836
	return r;
3837 3838
}

3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851
int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
{
#ifdef CONFIG_KVM_S390_UCONTROL
	if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET)
		 && (kvm_is_ucontrol(vcpu->kvm))) {
		vmf->page = virt_to_page(vcpu->arch.sie_block);
		get_page(vmf->page);
		return 0;
	}
#endif
	return VM_FAULT_SIGBUS;
}

3852 3853
int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
			    unsigned long npages)
3854 3855 3856 3857
{
	return 0;
}

3858
/* Section: memory related */
3859 3860
int kvm_arch_prepare_memory_region(struct kvm *kvm,
				   struct kvm_memory_slot *memslot,
3861
				   const struct kvm_userspace_memory_region *mem,
3862
				   enum kvm_mr_change change)
3863
{
3864 3865 3866 3867
	/* A few sanity checks. We can have memory slots which have to be
	   located/ended at a segment boundary (1MB). The memory in userland is
	   ok to be fragmented into various different vmas. It is okay to mmap()
	   and munmap() stuff in this slot after doing this call at any time */
3868

3869
	if (mem->userspace_addr & 0xffffful)
3870 3871
		return -EINVAL;

3872
	if (mem->memory_size & 0xffffful)
3873 3874
		return -EINVAL;

3875 3876 3877
	if (mem->guest_phys_addr + mem->memory_size > kvm->arch.mem_limit)
		return -EINVAL;

3878 3879 3880 3881
	return 0;
}

void kvm_arch_commit_memory_region(struct kvm *kvm,
3882
				const struct kvm_userspace_memory_region *mem,
3883
				const struct kvm_memory_slot *old,
3884
				const struct kvm_memory_slot *new,
3885
				enum kvm_mr_change change)
3886
{
3887
	int rc;
3888

3889 3890 3891 3892 3893 3894 3895 3896 3897 3898
	/* If the basics of the memslot do not change, we do not want
	 * to update the gmap. Every update causes several unnecessary
	 * segment translation exceptions. This is usually handled just
	 * fine by the normal fault handler + gmap, but it will also
	 * cause faults on the prefix page of running guest CPUs.
	 */
	if (old->userspace_addr == mem->userspace_addr &&
	    old->base_gfn * PAGE_SIZE == mem->guest_phys_addr &&
	    old->npages * PAGE_SIZE == mem->memory_size)
		return;
3899 3900 3901 3902

	rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr,
		mem->guest_phys_addr, mem->memory_size);
	if (rc)
3903
		pr_warn("failed to commit memory region\n");
3904
	return;
3905 3906
}

3907 3908 3909 3910 3911 3912 3913
static inline unsigned long nonhyp_mask(int i)
{
	unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30;

	return 0x0000ffffffffffffUL >> (nonhyp_fai << 4);
}

3914 3915 3916 3917 3918
void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu)
{
	vcpu->valid_wakeup = false;
}

3919 3920
static int __init kvm_s390_init(void)
{
3921 3922
	int i;

3923 3924 3925 3926 3927
	if (!sclp.has_sief2) {
		pr_info("SIE not available\n");
		return -ENODEV;
	}

3928 3929 3930 3931
	for (i = 0; i < 16; i++)
		kvm_s390_fac_list_mask[i] |=
			S390_lowcore.stfle_fac_list[i] & nonhyp_mask(i);

3932
	return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
3933 3934 3935 3936 3937 3938 3939 3940 3941
}

static void __exit kvm_s390_exit(void)
{
	kvm_exit();
}

module_init(kvm_s390_init);
module_exit(kvm_s390_exit);
3942 3943 3944 3945 3946 3947 3948 3949 3950

/*
 * Enable autoloading of the kvm module.
 * Note that we add the module alias here instead of virt/kvm/kvm_main.c
 * since x86 takes a different approach.
 */
#include <linux/miscdevice.h>
MODULE_ALIAS_MISCDEV(KVM_MINOR);
MODULE_ALIAS("devname:kvm");