kvm-s390.c 102.6 KB
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/*
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 * hosting zSeries kernel virtual machines
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 *
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 * Copyright IBM Corp. 2008, 2009
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 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (version 2 only)
 * as published by the Free Software Foundation.
 *
 *    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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158
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;
161

162
/* 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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}

336 337
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;
}

367
int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
368
{
369 370
	int r;

371
	switch (ext) {
372
	case KVM_CAP_S390_PSW:
373
	case KVM_CAP_S390_GMAP:
374
	case KVM_CAP_SYNC_MMU:
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#ifdef CONFIG_KVM_S390_UCONTROL
	case KVM_CAP_S390_UCONTROL:
#endif
378
	case KVM_CAP_ASYNC_PF:
379
	case KVM_CAP_SYNC_REGS:
380
	case KVM_CAP_ONE_REG:
381
	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:
386
	case KVM_CAP_S390_IRQCHIP:
387
	case KVM_CAP_VM_ATTRIBUTES:
388
	case KVM_CAP_MP_STATE:
389
	case KVM_CAP_IMMEDIATE_EXIT:
390
	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:
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	case KVM_CAP_S390_SKEYS:
394
	case KVM_CAP_S390_IRQ_STATE:
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	case KVM_CAP_S390_USER_INSTR0:
396
	case KVM_CAP_S390_CMMA_MIGRATION:
397
	case KVM_CAP_S390_AIS:
398
	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;
429
	}
430
	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;
449
		cond_resched();
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	}
}

453
/* 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;
464
	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);
	}
}

509 510 511 512 513 514 515 516
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) {
517
	case KVM_CAP_S390_IRQCHIP:
518
		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP");
519 520 521
		kvm->arch.use_irqchip = 1;
		r = 0;
		break;
522
	case KVM_CAP_S390_USER_SIGP:
523
		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP");
524 525 526
		kvm->arch.user_sigp = 1;
		r = 0;
		break;
527
	case KVM_CAP_S390_VECTOR_REGISTERS:
528
		mutex_lock(&kvm->lock);
529
		if (kvm->created_vcpus) {
530 531
			r = -EBUSY;
		} else if (MACHINE_HAS_VX) {
532 533
			set_kvm_facility(kvm->arch.model.fac_mask, 129);
			set_kvm_facility(kvm->arch.model.fac_list, 129);
534 535 536 537
			if (test_facility(134)) {
				set_kvm_facility(kvm->arch.model.fac_mask, 134);
				set_kvm_facility(kvm->arch.model.fac_list, 134);
			}
538 539 540 541
			if (test_facility(135)) {
				set_kvm_facility(kvm->arch.model.fac_mask, 135);
				set_kvm_facility(kvm->arch.model.fac_list, 135);
			}
542 543 544
			r = 0;
		} else
			r = -EINVAL;
545
		mutex_unlock(&kvm->lock);
546 547
		VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s",
			 r ? "(not available)" : "(success)");
548
		break;
549 550 551
	case KVM_CAP_S390_RI:
		r = -EINVAL;
		mutex_lock(&kvm->lock);
552
		if (kvm->created_vcpus) {
553 554
			r = -EBUSY;
		} else if (test_facility(64)) {
555 556
			set_kvm_facility(kvm->arch.model.fac_mask, 64);
			set_kvm_facility(kvm->arch.model.fac_list, 64);
557 558 559 560 561 562
			r = 0;
		}
		mutex_unlock(&kvm->lock);
		VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s",
			 r ? "(not available)" : "(success)");
		break;
563 564 565 566 567 568 569 570 571 572 573 574 575
	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
576 577 578 579 580 581 582 583 584 585 586 587 588 589
	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;
590
	case KVM_CAP_S390_USER_STSI:
591
		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI");
592 593 594
		kvm->arch.user_stsi = 1;
		r = 0;
		break;
595 596 597 598 599 600
	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;
601 602 603 604 605 606 607
	default:
		r = -EINVAL;
		break;
	}
	return r;
}

608 609 610 611 612 613 614
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;
615
		VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes",
616 617
			 kvm->arch.mem_limit);
		if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr))
618 619 620 621 622 623 624 625 626 627
			ret = -EFAULT;
		break;
	default:
		ret = -ENXIO;
		break;
	}
	return ret;
}

static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
628 629 630 631 632
{
	int ret;
	unsigned int idx;
	switch (attr->attr) {
	case KVM_S390_VM_MEM_ENABLE_CMMA:
633
		ret = -ENXIO;
634
		if (!sclp.has_cmma)
635 636
			break;

637
		ret = -EBUSY;
638
		VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support");
639
		mutex_lock(&kvm->lock);
640
		if (!kvm->created_vcpus) {
641 642 643 644 645 646
			kvm->arch.use_cmma = 1;
			ret = 0;
		}
		mutex_unlock(&kvm->lock);
		break;
	case KVM_S390_VM_MEM_CLR_CMMA:
647 648 649
		ret = -ENXIO;
		if (!sclp.has_cmma)
			break;
650 651 652 653
		ret = -EINVAL;
		if (!kvm->arch.use_cmma)
			break;

654
		VM_EVENT(kvm, 3, "%s", "RESET: CMMA states");
655 656
		mutex_lock(&kvm->lock);
		idx = srcu_read_lock(&kvm->srcu);
657
		s390_reset_cmma(kvm->arch.gmap->mm);
658 659 660 661
		srcu_read_unlock(&kvm->srcu, idx);
		mutex_unlock(&kvm->lock);
		ret = 0;
		break;
662 663 664 665 666 667 668 669 670
	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;

671 672
		if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT &&
		    new_limit > kvm->arch.mem_limit)
673 674
			return -E2BIG;

675 676 677
		if (!new_limit)
			return -EINVAL;

678
		/* gmap_create takes last usable address */
679 680 681
		if (new_limit != KVM_S390_NO_MEM_LIMIT)
			new_limit -= 1;

682 683
		ret = -EBUSY;
		mutex_lock(&kvm->lock);
684
		if (!kvm->created_vcpus) {
685 686
			/* gmap_create will round the limit up */
			struct gmap *new = gmap_create(current->mm, new_limit);
687 688 689 690

			if (!new) {
				ret = -ENOMEM;
			} else {
691
				gmap_remove(kvm->arch.gmap);
692 693 694 695 696 697
				new->private = kvm;
				kvm->arch.gmap = new;
				ret = 0;
			}
		}
		mutex_unlock(&kvm->lock);
698 699 700
		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);
701 702
		break;
	}
703 704 705 706 707 708 709
	default:
		ret = -ENXIO;
		break;
	}
	return ret;
}

710 711 712 713 714 715 716
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;

717
	if (!test_kvm_facility(kvm, 76))
718 719 720 721 722 723 724 725 726
		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;
727
		VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support");
728 729 730 731 732 733
		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;
734
		VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support");
735 736 737 738 739
		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));
740
		VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support");
741 742 743 744 745
		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));
746
		VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support");
747 748 749 750 751 752 753 754 755 756 757 758 759 760
		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;
}

761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883
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;
}

884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903
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;
}

904 905 906 907 908 909 910 911 912 913
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;
914
	VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high);
915 916 917 918 919 920

	return 0;
}

static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
{
921
	u64 gtod;
922 923 924 925

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

926
	kvm_s390_set_tod_clock(kvm, gtod);
927
	VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod);
928 929 930 931 932 933 934 935 936 937 938
	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) {
939 940 941
	case KVM_S390_VM_TOD_EXT:
		ret = kvm_s390_set_tod_ext(kvm, attr);
		break;
942 943 944 945 946 947 948 949 950 951 952 953 954
	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;
}

955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991
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;
}

992 993 994 995 996 997 998
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;
999
	VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high);
1000 1001 1002 1003 1004 1005

	return 0;
}

static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
{
1006
	u64 gtod;
1007

1008
	gtod = kvm_s390_get_tod_clock_fast(kvm);
1009 1010
	if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
		return -EFAULT;
1011
	VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod);
1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023

	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) {
1024 1025 1026
	case KVM_S390_VM_TOD_EXT:
		ret = kvm_s390_get_tod_ext(kvm, attr);
		break;
1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039
	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;
}

1040 1041 1042
static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_cpu_processor *proc;
1043
	u16 lowest_ibc, unblocked_ibc;
1044 1045 1046
	int ret = 0;

	mutex_lock(&kvm->lock);
1047
	if (kvm->created_vcpus) {
1048 1049 1050 1051 1052 1053 1054 1055 1056 1057
		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))) {
1058
		kvm->arch.model.cpuid = proc->cpuid;
1059 1060
		lowest_ibc = sclp.ibc >> 16 & 0xfff;
		unblocked_ibc = sclp.ibc & 0xfff;
1061
		if (lowest_ibc && proc->ibc) {
1062 1063 1064 1065 1066 1067 1068
			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;
		}
1069
		memcpy(kvm->arch.model.fac_list, proc->fac_list,
1070
		       S390_ARCH_FAC_LIST_SIZE_BYTE);
1071 1072 1073 1074 1075 1076 1077
		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]);
1078 1079 1080 1081 1082 1083 1084 1085
	} else
		ret = -EFAULT;
	kfree(proc);
out:
	mutex_unlock(&kvm->lock);
	return ret;
}

1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
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;
}

1109 1110 1111 1112 1113 1114 1115 1116 1117 1118
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;
}

1119 1120 1121 1122 1123 1124 1125 1126
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;
1127 1128 1129
	case KVM_S390_VM_CPU_PROCESSOR_FEAT:
		ret = kvm_s390_set_processor_feat(kvm, attr);
		break;
1130 1131 1132
	case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
		ret = kvm_s390_set_processor_subfunc(kvm, attr);
		break;
1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146
	}
	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;
	}
1147
	proc->cpuid = kvm->arch.model.cpuid;
1148
	proc->ibc = kvm->arch.model.ibc;
1149 1150
	memcpy(&proc->fac_list, kvm->arch.model.fac_list,
	       S390_ARCH_FAC_LIST_SIZE_BYTE);
1151 1152 1153 1154 1155 1156 1157
	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]);
1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175
	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);
1176
	mach->ibc = sclp.ibc;
1177
	memcpy(&mach->fac_mask, kvm->arch.model.fac_mask,
1178
	       S390_ARCH_FAC_LIST_SIZE_BYTE);
1179
	memcpy((unsigned long *)&mach->fac_list, S390_lowcore.stfle_fac_list,
1180
	       sizeof(S390_lowcore.stfle_fac_list));
1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191
	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]);
1192 1193 1194 1195 1196 1197 1198
	if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach)))
		ret = -EFAULT;
	kfree(mach);
out:
	return ret;
}

1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223
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;
}

1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242
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;
}
1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253
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;
1254 1255 1256 1257 1258 1259
	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;
1260 1261 1262 1263 1264 1265
	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;
1266 1267 1268 1269
	}
	return ret;
}

1270 1271 1272 1273 1274
static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret;

	switch (attr->group) {
1275
	case KVM_S390_VM_MEM_CTRL:
1276
		ret = kvm_s390_set_mem_control(kvm, attr);
1277
		break;
1278 1279 1280
	case KVM_S390_VM_TOD:
		ret = kvm_s390_set_tod(kvm, attr);
		break;
1281 1282 1283
	case KVM_S390_VM_CPU_MODEL:
		ret = kvm_s390_set_cpu_model(kvm, attr);
		break;
1284 1285 1286
	case KVM_S390_VM_CRYPTO:
		ret = kvm_s390_vm_set_crypto(kvm, attr);
		break;
1287 1288 1289
	case KVM_S390_VM_MIGRATION:
		ret = kvm_s390_vm_set_migration(kvm, attr);
		break;
1290 1291 1292 1293 1294 1295 1296 1297 1298 1299
	default:
		ret = -ENXIO;
		break;
	}

	return ret;
}

static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
1300 1301 1302 1303 1304 1305
	int ret;

	switch (attr->group) {
	case KVM_S390_VM_MEM_CTRL:
		ret = kvm_s390_get_mem_control(kvm, attr);
		break;
1306 1307 1308
	case KVM_S390_VM_TOD:
		ret = kvm_s390_get_tod(kvm, attr);
		break;
1309 1310 1311
	case KVM_S390_VM_CPU_MODEL:
		ret = kvm_s390_get_cpu_model(kvm, attr);
		break;
1312 1313 1314
	case KVM_S390_VM_MIGRATION:
		ret = kvm_s390_vm_get_migration(kvm, attr);
		break;
1315 1316 1317 1318 1319 1320
	default:
		ret = -ENXIO;
		break;
	}

	return ret;
1321 1322 1323 1324 1325 1326 1327
}

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

	switch (attr->group) {
1328 1329 1330 1331
	case KVM_S390_VM_MEM_CTRL:
		switch (attr->attr) {
		case KVM_S390_VM_MEM_ENABLE_CMMA:
		case KVM_S390_VM_MEM_CLR_CMMA:
1332 1333
			ret = sclp.has_cmma ? 0 : -ENXIO;
			break;
1334
		case KVM_S390_VM_MEM_LIMIT_SIZE:
1335 1336 1337 1338 1339 1340 1341
			ret = 0;
			break;
		default:
			ret = -ENXIO;
			break;
		}
		break;
1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352
	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;
1353 1354 1355 1356
	case KVM_S390_VM_CPU_MODEL:
		switch (attr->attr) {
		case KVM_S390_VM_CPU_PROCESSOR:
		case KVM_S390_VM_CPU_MACHINE:
1357 1358
		case KVM_S390_VM_CPU_PROCESSOR_FEAT:
		case KVM_S390_VM_CPU_MACHINE_FEAT:
1359
		case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
1360 1361
			ret = 0;
			break;
1362 1363
		/* configuring subfunctions is not supported yet */
		case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1364 1365 1366 1367 1368
		default:
			ret = -ENXIO;
			break;
		}
		break;
1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381
	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;
1382 1383 1384
	case KVM_S390_VM_MIGRATION:
		ret = 0;
		break;
1385 1386 1387 1388 1389 1390 1391 1392
	default:
		ret = -ENXIO;
		break;
	}

	return ret;
}

1393 1394 1395 1396
static long kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
{
	uint8_t *keys;
	uint64_t hva;
1397
	int srcu_idx, i, r = 0;
1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409

	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;

1410
	keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL);
1411 1412 1413
	if (!keys)
		return -ENOMEM;

1414
	down_read(&current->mm->mmap_sem);
1415
	srcu_idx = srcu_read_lock(&kvm->srcu);
1416 1417 1418 1419
	for (i = 0; i < args->count; i++) {
		hva = gfn_to_hva(kvm, args->start_gfn + i);
		if (kvm_is_error_hva(hva)) {
			r = -EFAULT;
1420
			break;
1421 1422
		}

1423 1424
		r = get_guest_storage_key(current->mm, hva, &keys[i]);
		if (r)
1425
			break;
1426
	}
1427
	srcu_read_unlock(&kvm->srcu, srcu_idx);
1428 1429 1430 1431 1432 1433 1434
	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;
1435 1436 1437 1438 1439 1440 1441 1442 1443 1444
	}

	kvfree(keys);
	return r;
}

static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
{
	uint8_t *keys;
	uint64_t hva;
1445
	int srcu_idx, i, r = 0;
1446 1447 1448 1449 1450 1451 1452 1453

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

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

1454
	keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL);
1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465
	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 */
1466 1467 1468
	r = s390_enable_skey();
	if (r)
		goto out;
1469

1470
	down_read(&current->mm->mmap_sem);
1471
	srcu_idx = srcu_read_lock(&kvm->srcu);
1472 1473 1474 1475
	for (i = 0; i < args->count; i++) {
		hva = gfn_to_hva(kvm, args->start_gfn + i);
		if (kvm_is_error_hva(hva)) {
			r = -EFAULT;
1476
			break;
1477 1478 1479 1480 1481
		}

		/* Lowest order bit is reserved */
		if (keys[i] & 0x01) {
			r = -EINVAL;
1482
			break;
1483 1484
		}

1485
		r = set_guest_storage_key(current->mm, hva, keys[i], 0);
1486
		if (r)
1487
			break;
1488
	}
1489
	srcu_read_unlock(&kvm->srcu, srcu_idx);
1490
	up_read(&current->mm->mmap_sem);
1491 1492 1493 1494 1495
out:
	kvfree(keys);
	return r;
}

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 1575 1576 1577
/*
 * 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 */
1578
		res[i++] = (pgstev >> 24) & 0x43;
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 1653 1654 1655
		/*
		 * 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;
1656
		mask &= _PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT;
1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671
		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;
}

1672 1673 1674 1675 1676
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;
1677
	struct kvm_device_attr attr;
1678 1679 1680
	int r;

	switch (ioctl) {
1681 1682 1683 1684 1685 1686 1687 1688 1689
	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;
	}
1690 1691 1692 1693 1694 1695 1696 1697
	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;
	}
1698 1699 1700 1701 1702 1703 1704
	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));
1705
			r = kvm_set_irq_routing(kvm, &routing, 0, 0);
1706 1707 1708
		}
		break;
	}
1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729
	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;
	}
1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749
	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;
	}
1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772
	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;
	}
1773
	default:
1774
		r = -ENOTTY;
1775 1776 1777 1778 1779
	}

	return r;
}

1780 1781 1782
static int kvm_s390_query_ap_config(u8 *config)
{
	u32 fcn_code = 0x04000000UL;
1783
	u32 cc = 0;
1784

1785
	memset(config, 0, 128);
1786 1787 1788 1789
	asm volatile(
		"lgr 0,%1\n"
		"lgr 2,%2\n"
		".long 0xb2af0000\n"		/* PQAP(QCI) */
1790
		"0: ipm %0\n"
1791
		"srl %0,28\n"
1792 1793 1794
		"1:\n"
		EX_TABLE(0b, 1b)
		: "+r" (cc)
1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806
		: "r" (fcn_code), "r" (config)
		: "cc", "0", "2", "memory"
	);

	return cc;
}

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

1807
	if (test_facility(12)) {
1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828
		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;
}

1829
static u64 kvm_s390_get_initial_cpuid(void)
1830
{
1831 1832 1833 1834 1835
	struct cpuid cpuid;

	get_cpu_id(&cpuid);
	cpuid.version = 0xff;
	return *((u64 *) &cpuid);
1836 1837
}

1838
static void kvm_s390_crypto_init(struct kvm *kvm)
1839
{
1840
	if (!test_kvm_facility(kvm, 76))
1841
		return;
1842

1843
	kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb;
1844
	kvm_s390_set_crycb_format(kvm);
1845

1846 1847 1848 1849 1850 1851 1852
	/* 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));
1853 1854
}

1855 1856 1857
static void sca_dispose(struct kvm *kvm)
{
	if (kvm->arch.use_esca)
1858
		free_pages_exact(kvm->arch.sca, sizeof(struct esca_block));
1859 1860 1861 1862 1863
	else
		free_page((unsigned long)(kvm->arch.sca));
	kvm->arch.sca = NULL;
}

1864
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
1865
{
1866
	gfp_t alloc_flags = GFP_KERNEL;
1867
	int i, rc;
1868
	char debug_name[16];
1869
	static unsigned long sca_offset;
1870

1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881
	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

1882 1883
	rc = s390_enable_sie();
	if (rc)
1884
		goto out_err;
1885

1886 1887
	rc = -ENOMEM;

1888
	kvm->arch.use_esca = 0; /* start with basic SCA */
1889 1890
	if (!sclp.has_64bscao)
		alloc_flags |= GFP_DMA;
1891
	rwlock_init(&kvm->arch.sca_lock);
1892
	kvm->arch.sca = (struct bsca_block *) get_zeroed_page(alloc_flags);
1893
	if (!kvm->arch.sca)
1894
		goto out_err;
1895
	spin_lock(&kvm_lock);
1896
	sca_offset += 16;
1897
	if (sca_offset + sizeof(struct bsca_block) > PAGE_SIZE)
1898
		sca_offset = 0;
1899 1900
	kvm->arch.sca = (struct bsca_block *)
			((char *) kvm->arch.sca + sca_offset);
1901
	spin_unlock(&kvm_lock);
1902 1903 1904

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

1905
	kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long));
1906
	if (!kvm->arch.dbf)
1907
		goto out_err;
1908

1909 1910 1911
	kvm->arch.sie_page2 =
	     (struct sie_page2 *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!kvm->arch.sie_page2)
1912
		goto out_err;
1913

1914
	/* Populate the facility mask initially. */
1915
	memcpy(kvm->arch.model.fac_mask, S390_lowcore.stfle_fac_list,
1916
	       sizeof(S390_lowcore.stfle_fac_list));
1917 1918
	for (i = 0; i < S390_ARCH_FAC_LIST_SIZE_U64; i++) {
		if (i < kvm_s390_fac_list_mask_size())
1919
			kvm->arch.model.fac_mask[i] &= kvm_s390_fac_list_mask[i];
1920
		else
1921
			kvm->arch.model.fac_mask[i] = 0UL;
1922 1923
	}

1924
	/* Populate the facility list initially. */
1925 1926
	kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list;
	memcpy(kvm->arch.model.fac_list, kvm->arch.model.fac_mask,
1927 1928
	       S390_ARCH_FAC_LIST_SIZE_BYTE);

1929 1930 1931 1932
	/* 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
1933 1934
	set_kvm_facility(kvm->arch.model.fac_mask, 74);
	set_kvm_facility(kvm->arch.model.fac_list, 74);
1935 1936 1937 1938
	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
1939

1940
	kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid();
1941
	kvm->arch.model.ibc = sclp.ibc & 0x0fff;
1942

1943
	kvm_s390_crypto_init(kvm);
1944

1945 1946 1947
	mutex_init(&kvm->arch.float_int.ais_lock);
	kvm->arch.float_int.simm = 0;
	kvm->arch.float_int.nimm = 0;
1948
	spin_lock_init(&kvm->arch.float_int.lock);
1949 1950
	for (i = 0; i < FIRQ_LIST_COUNT; i++)
		INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
1951
	init_waitqueue_head(&kvm->arch.ipte_wq);
1952
	mutex_init(&kvm->arch.ipte_mutex);
1953

1954
	debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
1955
	VM_EVENT(kvm, 3, "vm created with type %lu", type);
1956

1957 1958
	if (type & KVM_VM_S390_UCONTROL) {
		kvm->arch.gmap = NULL;
1959
		kvm->arch.mem_limit = KVM_S390_NO_MEM_LIMIT;
1960
	} else {
1961
		if (sclp.hamax == U64_MAX)
1962
			kvm->arch.mem_limit = TASK_SIZE_MAX;
1963
		else
1964
			kvm->arch.mem_limit = min_t(unsigned long, TASK_SIZE_MAX,
1965
						    sclp.hamax + 1);
1966
		kvm->arch.gmap = gmap_create(current->mm, kvm->arch.mem_limit - 1);
1967
		if (!kvm->arch.gmap)
1968
			goto out_err;
1969
		kvm->arch.gmap->private = kvm;
1970
		kvm->arch.gmap->pfault_enabled = 0;
1971
	}
1972 1973

	kvm->arch.css_support = 0;
1974
	kvm->arch.use_irqchip = 0;
1975
	kvm->arch.epoch = 0;
1976

1977
	spin_lock_init(&kvm->arch.start_stop_lock);
1978
	kvm_s390_vsie_init(kvm);
1979
	KVM_EVENT(3, "vm 0x%pK created by pid %u", kvm, current->pid);
1980

1981
	return 0;
1982
out_err:
1983
	free_page((unsigned long)kvm->arch.sie_page2);
1984
	debug_unregister(kvm->arch.dbf);
1985
	sca_dispose(kvm);
1986
	KVM_EVENT(3, "creation of vm failed: %d", rc);
1987
	return rc;
1988 1989
}

1990 1991 1992 1993 1994 1995 1996 1997 1998 1999
bool kvm_arch_has_vcpu_debugfs(void)
{
	return false;
}

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

2000 2001 2002
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
	VCPU_EVENT(vcpu, 3, "%s", "free cpu");
2003
	trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
2004
	kvm_s390_clear_local_irqs(vcpu);
2005
	kvm_clear_async_pf_completion_queue(vcpu);
2006
	if (!kvm_is_ucontrol(vcpu->kvm))
2007
		sca_del_vcpu(vcpu);
2008 2009

	if (kvm_is_ucontrol(vcpu->kvm))
2010
		gmap_remove(vcpu->arch.gmap);
2011

2012
	if (vcpu->kvm->arch.use_cmma)
2013
		kvm_s390_vcpu_unsetup_cmma(vcpu);
2014
	free_page((unsigned long)(vcpu->arch.sie_block));
2015

2016
	kvm_vcpu_uninit(vcpu);
2017
	kmem_cache_free(kvm_vcpu_cache, vcpu);
2018 2019 2020 2021 2022
}

static void kvm_free_vcpus(struct kvm *kvm)
{
	unsigned int i;
2023
	struct kvm_vcpu *vcpu;
2024

2025 2026 2027 2028 2029 2030 2031 2032 2033
	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);
2034 2035
}

2036 2037
void kvm_arch_destroy_vm(struct kvm *kvm)
{
2038
	kvm_free_vcpus(kvm);
2039
	sca_dispose(kvm);
2040
	debug_unregister(kvm->arch.dbf);
2041
	free_page((unsigned long)kvm->arch.sie_page2);
2042
	if (!kvm_is_ucontrol(kvm))
2043
		gmap_remove(kvm->arch.gmap);
2044
	kvm_s390_destroy_adapters(kvm);
2045
	kvm_s390_clear_float_irqs(kvm);
2046
	kvm_s390_vsie_destroy(kvm);
2047 2048 2049 2050
	if (kvm->arch.migration_state) {
		vfree(kvm->arch.migration_state->pgste_bitmap);
		kfree(kvm->arch.migration_state);
	}
2051
	KVM_EVENT(3, "vm 0x%pK destroyed", kvm);
2052 2053 2054
}

/* Section: vcpu related */
2055 2056
static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu)
{
2057
	vcpu->arch.gmap = gmap_create(current->mm, -1UL);
2058 2059 2060 2061 2062 2063 2064
	if (!vcpu->arch.gmap)
		return -ENOMEM;
	vcpu->arch.gmap->private = vcpu->kvm;

	return 0;
}

2065 2066
static void sca_del_vcpu(struct kvm_vcpu *vcpu)
{
2067 2068
	if (!kvm_s390_use_sca_entries())
		return;
2069
	read_lock(&vcpu->kvm->arch.sca_lock);
2070 2071
	if (vcpu->kvm->arch.use_esca) {
		struct esca_block *sca = vcpu->kvm->arch.sca;
2072

2073
		clear_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
2074
		sca->cpu[vcpu->vcpu_id].sda = 0;
2075 2076 2077 2078
	} else {
		struct bsca_block *sca = vcpu->kvm->arch.sca;

		clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
2079
		sca->cpu[vcpu->vcpu_id].sda = 0;
2080
	}
2081
	read_unlock(&vcpu->kvm->arch.sca_lock);
2082 2083
}

2084
static void sca_add_vcpu(struct kvm_vcpu *vcpu)
2085
{
2086 2087 2088 2089 2090 2091 2092
	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;
	}
2093 2094 2095
	read_lock(&vcpu->kvm->arch.sca_lock);
	if (vcpu->kvm->arch.use_esca) {
		struct esca_block *sca = vcpu->kvm->arch.sca;
2096

2097
		sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
2098 2099
		vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
		vcpu->arch.sie_block->scaol = (__u32)(__u64)sca & ~0x3fU;
2100
		vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
2101
		set_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
2102
	} else {
2103
		struct bsca_block *sca = vcpu->kvm->arch.sca;
2104

2105
		sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
2106 2107
		vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
		vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
2108
		set_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
2109
	}
2110
	read_unlock(&vcpu->kvm->arch.sca_lock);
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 2151 2152 2153
}

/* 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;
2154
		vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
2155 2156 2157 2158 2159 2160 2161 2162 2163
	}
	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);

2164 2165
	VM_EVENT(kvm, 2, "Switched to ESCA (0x%pK -> 0x%pK)",
		 old_sca, kvm->arch.sca);
2166
	return 0;
2167 2168 2169 2170
}

static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
{
2171 2172
	int rc;

2173 2174 2175 2176 2177
	if (!kvm_s390_use_sca_entries()) {
		if (id < KVM_MAX_VCPUS)
			return true;
		return false;
	}
2178 2179
	if (id < KVM_S390_BSCA_CPU_SLOTS)
		return true;
2180
	if (!sclp.has_esca || !sclp.has_64bscao)
2181 2182 2183 2184 2185 2186 2187
		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;
2188 2189
}

2190 2191
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
2192 2193
	vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
	kvm_clear_async_pf_completion_queue(vcpu);
2194 2195
	vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
				    KVM_SYNC_GPRS |
2196
				    KVM_SYNC_ACRS |
2197 2198 2199
				    KVM_SYNC_CRS |
				    KVM_SYNC_ARCH0 |
				    KVM_SYNC_PFAULT;
2200
	kvm_s390_set_prefix(vcpu, 0);
2201 2202
	if (test_kvm_facility(vcpu->kvm, 64))
		vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
F
Fan Zhang 已提交
2203 2204
	if (test_kvm_facility(vcpu->kvm, 133))
		vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB;
2205 2206 2207 2208
	/* 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)
2209
		vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
2210 2211
	else
		vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS;
2212 2213 2214 2215

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

2216 2217 2218
	return 0;
}

2219 2220 2221 2222
/* 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);
2223
	raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2224
	vcpu->arch.cputm_start = get_tod_clock_fast();
2225
	raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2226 2227 2228 2229 2230 2231
}

/* 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);
2232
	raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2233 2234
	vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start;
	vcpu->arch.cputm_start = 0;
2235
	raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
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 2265 2266 2267
}

/* 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();
}

2268 2269 2270
/* 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)
{
2271
	preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2272
	raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2273 2274
	if (vcpu->arch.cputm_enabled)
		vcpu->arch.cputm_start = get_tod_clock_fast();
2275
	vcpu->arch.sie_block->cputm = cputm;
2276
	raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2277
	preempt_enable();
2278 2279
}

2280
/* update and get the cpu timer - can also be called from other VCPU threads */
2281 2282
__u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu)
{
2283
	unsigned int seq;
2284 2285 2286 2287 2288
	__u64 value;

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

2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302
	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();
2303
	return value;
2304 2305
}

2306 2307
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
2308

2309
	gmap_enable(vcpu->arch.enabled_gmap);
2310
	atomic_or(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
2311
	if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
2312
		__start_cpu_timer_accounting(vcpu);
2313
	vcpu->cpu = cpu;
2314 2315 2316 2317
}

void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
2318
	vcpu->cpu = -1;
2319
	if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
2320
		__stop_cpu_timer_accounting(vcpu);
2321
	atomic_andnot(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
2322 2323
	vcpu->arch.enabled_gmap = gmap_get_enabled();
	gmap_disable(vcpu->arch.enabled_gmap);
2324

2325 2326 2327 2328 2329 2330 2331
}

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;
2332
	kvm_s390_set_prefix(vcpu, 0);
2333
	kvm_s390_set_cpu_timer(vcpu, 0);
2334 2335 2336 2337 2338
	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;
2339 2340 2341
	/* make sure the new fpc will be lazily loaded */
	save_fpu_regs();
	current->thread.fpu.fpc = 0;
2342
	vcpu->arch.sie_block->gbea = 1;
2343
	vcpu->arch.sie_block->pp = 0;
2344 2345
	vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
	kvm_clear_async_pf_completion_queue(vcpu);
2346 2347
	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
		kvm_s390_vcpu_stop(vcpu);
2348
	kvm_s390_clear_local_irqs(vcpu);
2349 2350
}

2351
void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
2352
{
2353
	mutex_lock(&vcpu->kvm->lock);
2354
	preempt_disable();
2355
	vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch;
2356
	preempt_enable();
2357
	mutex_unlock(&vcpu->kvm->lock);
2358
	if (!kvm_is_ucontrol(vcpu->kvm)) {
2359
		vcpu->arch.gmap = vcpu->kvm->arch.gmap;
2360
		sca_add_vcpu(vcpu);
2361
	}
2362 2363
	if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0)
		vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
2364 2365
	/* make vcpu_load load the right gmap on the first trigger */
	vcpu->arch.enabled_gmap = vcpu->arch.gmap;
2366 2367
}

2368 2369
static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
{
2370
	if (!test_kvm_facility(vcpu->kvm, 76))
2371 2372
		return;

2373 2374 2375 2376 2377 2378 2379
	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;

2380 2381 2382
	vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
}

2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394
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;

2395
	vcpu->arch.sie_block->ecb2 &= ~ECB2_PFMFI;
2396 2397 2398
	return 0;
}

2399 2400 2401 2402 2403
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;
2404
	if (test_kvm_facility(vcpu->kvm, 7))
2405
		vcpu->arch.sie_block->fac = (u32)(u64) model->fac_list;
2406 2407
}

2408 2409
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
2410
	int rc = 0;
2411

2412 2413
	atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
						    CPUSTAT_SM |
2414 2415
						    CPUSTAT_STOPPED);

2416
	if (test_kvm_facility(vcpu->kvm, 78))
2417
		atomic_or(CPUSTAT_GED2, &vcpu->arch.sie_block->cpuflags);
2418
	else if (test_kvm_facility(vcpu->kvm, 8))
2419
		atomic_or(CPUSTAT_GED, &vcpu->arch.sie_block->cpuflags);
2420

2421 2422
	kvm_s390_vcpu_setup_model(vcpu);

2423 2424
	/* pgste_set_pte has special handling for !MACHINE_HAS_ESOP */
	if (MACHINE_HAS_ESOP)
2425
		vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT;
2426
	if (test_kvm_facility(vcpu->kvm, 9))
2427
		vcpu->arch.sie_block->ecb |= ECB_SRSI;
2428
	if (test_kvm_facility(vcpu->kvm, 73))
2429
		vcpu->arch.sie_block->ecb |= ECB_TE;
2430

2431
	if (test_kvm_facility(vcpu->kvm, 8) && sclp.has_pfmfi)
2432
		vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI;
2433
	if (test_kvm_facility(vcpu->kvm, 130))
2434 2435
		vcpu->arch.sie_block->ecb2 |= ECB2_IEP;
	vcpu->arch.sie_block->eca = ECA_MVPGI | ECA_PROTEXCI;
2436
	if (sclp.has_cei)
2437
		vcpu->arch.sie_block->eca |= ECA_CEI;
2438
	if (sclp.has_ib)
2439
		vcpu->arch.sie_block->eca |= ECA_IB;
2440
	if (sclp.has_siif)
2441
		vcpu->arch.sie_block->eca |= ECA_SII;
2442
	if (sclp.has_sigpif)
2443
		vcpu->arch.sie_block->eca |= ECA_SIGPI;
2444
	if (test_kvm_facility(vcpu->kvm, 129)) {
2445 2446
		vcpu->arch.sie_block->eca |= ECA_VX;
		vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
2447
	}
2448 2449 2450
	if (test_kvm_facility(vcpu->kvm, 139))
		vcpu->arch.sie_block->ecd |= ECD_MEF;

F
Fan Zhang 已提交
2451 2452
	vcpu->arch.sie_block->sdnxo = ((unsigned long) &vcpu->run->s.regs.sdnx)
					| SDNXC;
2453
	vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb;
2454 2455 2456 2457 2458

	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;
2459

2460
	if (vcpu->kvm->arch.use_cmma) {
2461 2462 2463
		rc = kvm_s390_vcpu_setup_cmma(vcpu);
		if (rc)
			return rc;
2464
	}
2465
	hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
2466
	vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
2467

2468 2469
	kvm_s390_vcpu_crypto_setup(vcpu);

2470
	return rc;
2471 2472 2473 2474 2475
}

struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
				      unsigned int id)
{
2476
	struct kvm_vcpu *vcpu;
2477
	struct sie_page *sie_page;
2478 2479
	int rc = -EINVAL;

2480
	if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id))
2481 2482 2483
		goto out;

	rc = -ENOMEM;
2484

2485
	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
2486
	if (!vcpu)
2487
		goto out;
2488

2489
	BUILD_BUG_ON(sizeof(struct sie_page) != 4096);
2490 2491
	sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL);
	if (!sie_page)
2492 2493
		goto out_free_cpu;

2494 2495 2496
	vcpu->arch.sie_block = &sie_page->sie_block;
	vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb;

2497 2498 2499 2500
	/* the real guest size will always be smaller than msl */
	vcpu->arch.sie_block->mso = 0;
	vcpu->arch.sie_block->msl = sclp.hamax;

2501
	vcpu->arch.sie_block->icpua = id;
2502 2503
	spin_lock_init(&vcpu->arch.local_int.lock);
	vcpu->arch.local_int.float_int = &kvm->arch.float_int;
2504
	vcpu->arch.local_int.wq = &vcpu->wq;
2505
	vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags;
2506
	seqcount_init(&vcpu->arch.cputm_seqcount);
2507

2508 2509
	rc = kvm_vcpu_init(vcpu, kvm, id);
	if (rc)
2510
		goto out_free_sie_block;
2511
	VM_EVENT(kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK", id, vcpu,
2512
		 vcpu->arch.sie_block);
2513
	trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);
2514 2515

	return vcpu;
2516 2517
out_free_sie_block:
	free_page((unsigned long)(vcpu->arch.sie_block));
2518
out_free_cpu:
2519
	kmem_cache_free(kvm_vcpu_cache, vcpu);
2520
out:
2521 2522 2523 2524 2525
	return ERR_PTR(rc);
}

int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
2526
	return kvm_s390_vcpu_has_irq(vcpu, 0);
2527 2528
}

2529 2530
bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
{
2531
	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE);
2532 2533
}

2534
void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu)
2535
{
2536
	atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
2537
	exit_sie(vcpu);
2538 2539
}

2540
void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu)
2541
{
2542
	atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
2543 2544
}

2545 2546
static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu)
{
2547
	atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
2548
	exit_sie(vcpu);
2549 2550 2551 2552
}

static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu)
{
2553
	atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
2554 2555
}

2556 2557 2558 2559 2560 2561
/*
 * 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)
{
2562
	atomic_or(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags);
2563 2564 2565 2566
	while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE)
		cpu_relax();
}

2567 2568
/* Kick a guest cpu out of SIE to process a request synchronously */
void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu)
2569
{
2570 2571
	kvm_make_request(req, vcpu);
	kvm_s390_vcpu_request(vcpu);
2572 2573
}

2574 2575
static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
			      unsigned long end)
2576 2577 2578
{
	struct kvm *kvm = gmap->private;
	struct kvm_vcpu *vcpu;
2579 2580
	unsigned long prefix;
	int i;
2581

2582 2583
	if (gmap_is_shadow(gmap))
		return;
2584 2585 2586
	if (start >= 1UL << 31)
		/* We are only interested in prefix pages */
		return;
2587 2588
	kvm_for_each_vcpu(i, vcpu, kvm) {
		/* match against both prefix pages */
2589 2590 2591 2592
		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);
2593
			kvm_s390_sync_request(KVM_REQ_MMU_RELOAD, vcpu);
2594 2595 2596 2597
		}
	}
}

2598 2599 2600 2601 2602 2603 2604
int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
{
	/* kvm common code refers to this, but never calls it */
	BUG();
	return 0;
}

2605 2606 2607 2608 2609 2610
static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
					   struct kvm_one_reg *reg)
{
	int r = -EINVAL;

	switch (reg->id) {
2611 2612 2613 2614 2615 2616 2617 2618
	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;
2619
	case KVM_REG_S390_CPU_TIMER:
2620
		r = put_user(kvm_s390_get_cpu_timer(vcpu),
2621 2622 2623 2624 2625 2626
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_CLOCK_COMP:
		r = put_user(vcpu->arch.sie_block->ckc,
			     (u64 __user *)reg->addr);
		break;
2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638
	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;
2639 2640 2641 2642
	case KVM_REG_S390_PP:
		r = put_user(vcpu->arch.sie_block->pp,
			     (u64 __user *)reg->addr);
		break;
2643 2644 2645 2646
	case KVM_REG_S390_GBEA:
		r = put_user(vcpu->arch.sie_block->gbea,
			     (u64 __user *)reg->addr);
		break;
2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657
	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;
2658
	__u64 val;
2659 2660

	switch (reg->id) {
2661 2662 2663 2664 2665 2666 2667 2668
	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;
2669
	case KVM_REG_S390_CPU_TIMER:
2670 2671 2672
		r = get_user(val, (u64 __user *)reg->addr);
		if (!r)
			kvm_s390_set_cpu_timer(vcpu, val);
2673 2674 2675 2676 2677
		break;
	case KVM_REG_S390_CLOCK_COMP:
		r = get_user(vcpu->arch.sie_block->ckc,
			     (u64 __user *)reg->addr);
		break;
2678 2679 2680
	case KVM_REG_S390_PFTOKEN:
		r = get_user(vcpu->arch.pfault_token,
			     (u64 __user *)reg->addr);
2681 2682
		if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
			kvm_clear_async_pf_completion_queue(vcpu);
2683 2684 2685 2686 2687 2688 2689 2690 2691
		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;
2692 2693 2694 2695
	case KVM_REG_S390_PP:
		r = get_user(vcpu->arch.sie_block->pp,
			     (u64 __user *)reg->addr);
		break;
2696 2697 2698 2699
	case KVM_REG_S390_GBEA:
		r = get_user(vcpu->arch.sie_block->gbea,
			     (u64 __user *)reg->addr);
		break;
2700 2701 2702 2703 2704 2705
	default:
		break;
	}

	return r;
}
2706

2707 2708 2709 2710 2711 2712 2713 2714
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)
{
2715
	memcpy(&vcpu->run->s.regs.gprs, &regs->gprs, sizeof(regs->gprs));
2716 2717 2718 2719 2720
	return 0;
}

int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
2721
	memcpy(&regs->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
2722 2723 2724 2725 2726 2727
	return 0;
}

int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs)
{
2728
	memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
2729 2730 2731 2732 2733 2734 2735
	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)
{
2736
	memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
2737 2738 2739 2740 2741 2742
	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)
{
2743 2744
	if (test_fp_ctl(fpu->fpc))
		return -EINVAL;
2745
	vcpu->run->s.regs.fpc = fpu->fpc;
2746
	if (MACHINE_HAS_VX)
2747 2748
		convert_fp_to_vx((__vector128 *) vcpu->run->s.regs.vrs,
				 (freg_t *) fpu->fprs);
2749
	else
2750
		memcpy(vcpu->run->s.regs.fprs, &fpu->fprs, sizeof(fpu->fprs));
2751 2752 2753 2754 2755
	return 0;
}

int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
2756 2757 2758
	/* make sure we have the latest values */
	save_fpu_regs();
	if (MACHINE_HAS_VX)
2759 2760
		convert_vx_to_fp((freg_t *) fpu->fprs,
				 (__vector128 *) vcpu->run->s.regs.vrs);
2761
	else
2762
		memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs));
2763
	fpu->fpc = vcpu->run->s.regs.fpc;
2764 2765 2766 2767 2768 2769 2770
	return 0;
}

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

2771
	if (!is_vcpu_stopped(vcpu))
2772
		rc = -EBUSY;
2773 2774 2775 2776
	else {
		vcpu->run->psw_mask = psw.mask;
		vcpu->run->psw_addr = psw.addr;
	}
2777 2778 2779 2780 2781 2782 2783 2784 2785
	return rc;
}

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

2786 2787 2788 2789
#define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \
			      KVM_GUESTDBG_USE_HW_BP | \
			      KVM_GUESTDBG_ENABLE)

J
Jan Kiszka 已提交
2790 2791
int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
					struct kvm_guest_debug *dbg)
2792
{
2793 2794 2795 2796 2797
	int rc = 0;

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

2798
	if (dbg->control & ~VALID_GUESTDBG_FLAGS)
2799
		return -EINVAL;
2800 2801
	if (!sclp.has_gpere)
		return -EINVAL;
2802 2803 2804 2805

	if (dbg->control & KVM_GUESTDBG_ENABLE) {
		vcpu->guest_debug = dbg->control;
		/* enforce guest PER */
2806
		atomic_or(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2807 2808 2809 2810

		if (dbg->control & KVM_GUESTDBG_USE_HW_BP)
			rc = kvm_s390_import_bp_data(vcpu, dbg);
	} else {
2811
		atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2812 2813 2814 2815 2816 2817
		vcpu->arch.guestdbg.last_bp = 0;
	}

	if (rc) {
		vcpu->guest_debug = 0;
		kvm_s390_clear_bp_data(vcpu);
2818
		atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2819 2820 2821
	}

	return rc;
2822 2823
}

2824 2825 2826
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
				    struct kvm_mp_state *mp_state)
{
2827 2828 2829
	/* CHECK_STOP and LOAD are not supported yet */
	return is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED :
				       KVM_MP_STATE_OPERATING;
2830 2831 2832 2833 2834
}

int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
				    struct kvm_mp_state *mp_state)
{
2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854
	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;
2855 2856
}

2857 2858 2859 2860 2861
static bool ibs_enabled(struct kvm_vcpu *vcpu)
{
	return atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_IBS;
}

2862 2863
static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
{
2864
retry:
2865
	kvm_s390_vcpu_request_handled(vcpu);
R
Radim Krčmář 已提交
2866
	if (!kvm_request_pending(vcpu))
2867
		return 0;
2868 2869
	/*
	 * We use MMU_RELOAD just to re-arm the ipte notifier for the
2870
	 * guest prefix page. gmap_mprotect_notify will wait on the ptl lock.
2871 2872 2873 2874
	 * 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.
	 */
2875
	if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) {
2876
		int rc;
2877 2878 2879
		rc = gmap_mprotect_notify(vcpu->arch.gmap,
					  kvm_s390_get_prefix(vcpu),
					  PAGE_SIZE * 2, PROT_WRITE);
2880 2881
		if (rc) {
			kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
2882
			return rc;
2883
		}
2884
		goto retry;
2885
	}
2886

2887 2888 2889 2890 2891
	if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
		vcpu->arch.sie_block->ihcpu = 0xffff;
		goto retry;
	}

2892 2893 2894
	if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) {
		if (!ibs_enabled(vcpu)) {
			trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1);
2895
			atomic_or(CPUSTAT_IBS,
2896 2897 2898
					&vcpu->arch.sie_block->cpuflags);
		}
		goto retry;
2899
	}
2900 2901 2902 2903

	if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) {
		if (ibs_enabled(vcpu)) {
			trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0);
2904
			atomic_andnot(CPUSTAT_IBS,
2905 2906 2907 2908 2909
					  &vcpu->arch.sie_block->cpuflags);
		}
		goto retry;
	}

2910 2911 2912 2913 2914
	if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) {
		vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
		goto retry;
	}

2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935
	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;
	}

2936
	/* nothing to do, just clear the request */
2937
	kvm_clear_request(KVM_REQ_UNHALT, vcpu);
2938

2939 2940 2941
	return 0;
}

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 2968 2969 2970
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);
}

2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986
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);
}

2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997
/**
 * 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)
2998
{
2999 3000
	return gmap_fault(vcpu->arch.gmap, gpa,
			  writable ? FAULT_FLAG_WRITE : 0);
3001 3002
}

3003 3004 3005 3006
static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token,
				      unsigned long token)
{
	struct kvm_s390_interrupt inti;
3007
	struct kvm_s390_irq irq;
3008 3009

	if (start_token) {
3010 3011 3012
		irq.u.ext.ext_params2 = token;
		irq.type = KVM_S390_INT_PFAULT_INIT;
		WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq));
3013 3014
	} else {
		inti.type = KVM_S390_INT_PFAULT_DONE;
3015
		inti.parm64 = token;
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 3059 3060 3061
		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;
3062
	if (kvm_s390_vcpu_has_irq(vcpu, 0))
3063 3064 3065 3066 3067 3068
		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
3069 3070 3071
	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))
3072 3073 3074 3075 3076 3077
		return 0;

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

3078
static int vcpu_pre_run(struct kvm_vcpu *vcpu)
3079
{
3080
	int rc, cpuflags;
3081

3082 3083 3084 3085 3086 3087 3088
	/*
	 * 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);

3089 3090
	vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14];
	vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15];
3091 3092 3093 3094

	if (need_resched())
		schedule();

3095
	if (test_cpu_flag(CIF_MCCK_PENDING))
3096 3097
		s390_handle_mcck();

3098 3099 3100 3101 3102
	if (!kvm_is_ucontrol(vcpu->kvm)) {
		rc = kvm_s390_deliver_pending_interrupts(vcpu);
		if (rc)
			return rc;
	}
C
Carsten Otte 已提交
3103

3104 3105 3106 3107
	rc = kvm_s390_handle_requests(vcpu);
	if (rc)
		return rc;

3108 3109 3110 3111 3112
	if (guestdbg_enabled(vcpu)) {
		kvm_s390_backup_guest_per_regs(vcpu);
		kvm_s390_patch_guest_per_regs(vcpu);
	}

3113
	vcpu->arch.sie_block->icptcode = 0;
3114 3115 3116
	cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
	VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags);
	trace_kvm_s390_sie_enter(vcpu, cpuflags);
3117

3118 3119 3120
	return 0;
}

3121 3122
static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu)
{
3123 3124 3125 3126
	struct kvm_s390_pgm_info pgm_info = {
		.code = PGM_ADDRESSING,
	};
	u8 opcode, ilen;
3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139
	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.
	 */
3140
	rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1);
3141
	ilen = insn_length(opcode);
3142 3143 3144 3145 3146 3147 3148 3149 3150 3151
	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;
	}
3152 3153 3154
	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);
3155 3156
}

3157 3158
static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason)
{
3159 3160 3161
	struct mcck_volatile_info *mcck_info;
	struct sie_page *sie_page;

3162 3163 3164 3165
	VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
		   vcpu->arch.sie_block->icptcode);
	trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);

3166 3167 3168
	if (guestdbg_enabled(vcpu))
		kvm_s390_restore_guest_per_regs(vcpu);

3169 3170
	vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14;
	vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15;
3171

3172 3173 3174 3175 3176 3177 3178 3179 3180
	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;
	}

3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193
	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;
3194 3195 3196 3197 3198
	} 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;
3199
		return -EREMOTE;
3200
	} else if (current->thread.gmap_pfault) {
3201
		trace_kvm_s390_major_guest_pfault(vcpu);
3202
		current->thread.gmap_pfault = 0;
3203 3204 3205
		if (kvm_arch_setup_async_pf(vcpu))
			return 0;
		return kvm_arch_fault_in_page(vcpu, current->thread.gmap_addr, 1);
3206
	}
3207
	return vcpu_post_run_fault_in_sie(vcpu);
3208 3209 3210 3211 3212 3213
}

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

3214 3215 3216 3217 3218 3219
	/*
	 * 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);

3220 3221 3222 3223
	do {
		rc = vcpu_pre_run(vcpu);
		if (rc)
			break;
3224

3225
		srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
3226 3227 3228 3229
		/*
		 * As PF_VCPU will be used in fault handler, between
		 * guest_enter and guest_exit should be no uaccess.
		 */
3230
		local_irq_disable();
3231
		guest_enter_irqoff();
3232
		__disable_cpu_timer_accounting(vcpu);
3233
		local_irq_enable();
3234 3235
		exit_reason = sie64a(vcpu->arch.sie_block,
				     vcpu->run->s.regs.gprs);
3236
		local_irq_disable();
3237
		__enable_cpu_timer_accounting(vcpu);
3238
		guest_exit_irqoff();
3239
		local_irq_enable();
3240
		vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
3241 3242

		rc = vcpu_post_run(vcpu, exit_reason);
3243
	} while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc);
3244

3245
	srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
3246
	return rc;
3247 3248
}

3249 3250
static void sync_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
3251
	struct runtime_instr_cb *riccb;
F
Fan Zhang 已提交
3252
	struct gs_cb *gscb;
3253 3254

	riccb = (struct runtime_instr_cb *) &kvm_run->s.regs.riccb;
F
Fan Zhang 已提交
3255
	gscb = (struct gs_cb *) &kvm_run->s.regs.gscb;
3256 3257 3258 3259 3260 3261
	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);
3262 3263
		/* some control register changes require a tlb flush */
		kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
3264 3265
	}
	if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
3266
		kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm);
3267 3268 3269 3270 3271 3272 3273 3274 3275
		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;
3276 3277
		if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
			kvm_clear_async_pf_completion_queue(vcpu);
3278
	}
F
Fan Zhang 已提交
3279 3280 3281 3282 3283
	/*
	 * 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) &&
3284
	    test_kvm_facility(vcpu->kvm, 64) &&
3285
	    riccb->v &&
3286
	    !(vcpu->arch.sie_block->ecb3 & ECB3_RI)) {
3287
		VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (sync_regs)");
3288
		vcpu->arch.sie_block->ecb3 |= ECB3_RI;
F
Fan Zhang 已提交
3289
	}
F
Fan Zhang 已提交
3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301
	/*
	 * 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
3302
	}
3303 3304
	save_access_regs(vcpu->arch.host_acrs);
	restore_access_regs(vcpu->run->s.regs.acrs);
3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316
	/* 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
3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330
	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
3331

3332 3333 3334 3335 3336 3337 3338 3339 3340
	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);
3341
	kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu);
3342 3343 3344 3345 3346 3347 3348
	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;
3349 3350
	save_access_regs(vcpu->run->s.regs.acrs);
	restore_access_regs(vcpu->arch.host_acrs);
3351 3352 3353 3354 3355 3356
	/* 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
3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368
	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;
	}
3369

3370 3371
}

3372 3373
int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
3374
	int rc;
3375 3376
	sigset_t sigsaved;

3377 3378 3379
	if (kvm_run->immediate_exit)
		return -EINTR;

3380 3381 3382 3383 3384
	if (guestdbg_exit_pending(vcpu)) {
		kvm_s390_prepare_debug_exit(vcpu);
		return 0;
	}

3385 3386 3387
	if (vcpu->sigset_active)
		sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);

3388 3389 3390
	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) {
		kvm_s390_vcpu_start(vcpu);
	} else if (is_vcpu_stopped(vcpu)) {
3391
		pr_err_ratelimited("can't run stopped vcpu %d\n",
3392 3393 3394
				   vcpu->vcpu_id);
		return -EINVAL;
	}
3395

3396
	sync_regs(vcpu, kvm_run);
3397
	enable_cpu_timer_accounting(vcpu);
3398

3399
	might_fault();
3400
	rc = __vcpu_run(vcpu);
3401

3402 3403
	if (signal_pending(current) && !rc) {
		kvm_run->exit_reason = KVM_EXIT_INTR;
3404
		rc = -EINTR;
3405
	}
3406

3407 3408 3409 3410 3411
	if (guestdbg_exit_pending(vcpu) && !rc)  {
		kvm_s390_prepare_debug_exit(vcpu);
		rc = 0;
	}

3412
	if (rc == -EREMOTE) {
3413
		/* userspace support is needed, kvm_run has been prepared */
3414 3415
		rc = 0;
	}
3416

3417
	disable_cpu_timer_accounting(vcpu);
3418
	store_regs(vcpu, kvm_run);
3419

3420 3421 3422 3423
	if (vcpu->sigset_active)
		sigprocmask(SIG_SETMASK, &sigsaved, NULL);

	vcpu->stat.exit_userspace++;
3424
	return rc;
3425 3426 3427 3428 3429 3430 3431 3432
}

/*
 * 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
 */
3433
int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa)
3434
{
3435
	unsigned char archmode = 1;
3436
	freg_t fprs[NUM_FPRS];
3437
	unsigned int px;
3438
	u64 clkcomp, cputm;
3439
	int rc;
3440

3441
	px = kvm_s390_get_prefix(vcpu);
3442 3443
	if (gpa == KVM_S390_STORE_STATUS_NOADDR) {
		if (write_guest_abs(vcpu, 163, &archmode, 1))
3444
			return -EFAULT;
3445
		gpa = 0;
3446 3447
	} else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) {
		if (write_guest_real(vcpu, 163, &archmode, 1))
3448
			return -EFAULT;
3449 3450 3451
		gpa = px;
	} else
		gpa -= __LC_FPREGS_SAVE_AREA;
3452 3453 3454

	/* manually convert vector registers if necessary */
	if (MACHINE_HAS_VX) {
3455
		convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
3456 3457 3458 3459
		rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
				     fprs, 128);
	} else {
		rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
3460
				     vcpu->run->s.regs.fprs, 128);
3461
	}
3462
	rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA,
3463
			      vcpu->run->s.regs.gprs, 128);
3464
	rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA,
3465
			      &vcpu->arch.sie_block->gpsw, 16);
3466
	rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA,
3467
			      &px, 4);
3468
	rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA,
3469
			      &vcpu->run->s.regs.fpc, 4);
3470
	rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA,
3471
			      &vcpu->arch.sie_block->todpr, 4);
3472
	cputm = kvm_s390_get_cpu_timer(vcpu);
3473
	rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA,
3474
			      &cputm, 8);
3475
	clkcomp = vcpu->arch.sie_block->ckc >> 8;
3476
	rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA,
3477
			      &clkcomp, 8);
3478
	rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA,
3479
			      &vcpu->run->s.regs.acrs, 64);
3480
	rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA,
3481 3482
			      &vcpu->arch.sie_block->gcr, 128);
	return rc ? -EFAULT : 0;
3483 3484
}

3485 3486 3487 3488
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
3489
	 * switch in the run ioctl. Let's update our copies before we save
3490 3491
	 * it into the save area
	 */
3492
	save_fpu_regs();
3493
	vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
3494 3495 3496 3497 3498
	save_access_regs(vcpu->run->s.regs.acrs);

	return kvm_s390_store_status_unloaded(vcpu, addr);
}

3499 3500 3501
static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
{
	kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu);
3502
	kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu);
3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516
}

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)
{
3517 3518
	if (!sclp.has_ibs)
		return;
3519
	kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu);
3520
	kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu);
3521 3522
}

3523 3524
void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu)
{
3525 3526 3527 3528 3529
	int i, online_vcpus, started_vcpus = 0;

	if (!is_vcpu_stopped(vcpu))
		return;

3530
	trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1);
3531
	/* Only one cpu at a time may enter/leave the STOPPED state. */
3532
	spin_lock(&vcpu->kvm->arch.start_stop_lock);
3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551
	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);
	}

3552
	atomic_andnot(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
3553 3554 3555 3556
	/*
	 * Another VCPU might have used IBS while we were offline.
	 * Let's play safe and flush the VCPU at startup.
	 */
3557
	kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
3558
	spin_unlock(&vcpu->kvm->arch.start_stop_lock);
3559
	return;
3560 3561 3562 3563
}

void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu)
{
3564 3565 3566 3567 3568 3569
	int i, online_vcpus, started_vcpus = 0;
	struct kvm_vcpu *started_vcpu = NULL;

	if (is_vcpu_stopped(vcpu))
		return;

3570
	trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0);
3571
	/* Only one cpu at a time may enter/leave the STOPPED state. */
3572
	spin_lock(&vcpu->kvm->arch.start_stop_lock);
3573 3574
	online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);

3575
	/* SIGP STOP and SIGP STOP AND STORE STATUS has been fully processed */
3576
	kvm_s390_clear_stop_irq(vcpu);
3577

3578
	atomic_or(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595
	__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);
	}

3596
	spin_unlock(&vcpu->kvm->arch.start_stop_lock);
3597
	return;
3598 3599
}

3600 3601 3602 3603 3604 3605 3606 3607 3608
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) {
3609 3610 3611
	case KVM_CAP_S390_CSS_SUPPORT:
		if (!vcpu->kvm->arch.css_support) {
			vcpu->kvm->arch.css_support = 1;
3612
			VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support");
3613 3614 3615 3616
			trace_kvm_s390_enable_css(vcpu->kvm);
		}
		r = 0;
		break;
3617 3618 3619 3620 3621 3622 3623
	default:
		r = -EINVAL;
		break;
	}
	return r;
}

3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649
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) {
3650 3651
			r = check_gva_range(vcpu, mop->gaddr, mop->ar,
					    mop->size, GACC_FETCH);
3652 3653 3654 3655 3656 3657 3658 3659 3660 3661
			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) {
3662 3663
			r = check_gva_range(vcpu, mop->gaddr, mop->ar,
					    mop->size, GACC_STORE);
3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684
			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;
}

3685 3686 3687 3688 3689
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;
3690
	int idx;
3691
	long r;
3692

3693
	switch (ioctl) {
3694 3695 3696 3697 3698 3699 3700 3701 3702
	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;
	}
3703
	case KVM_S390_INTERRUPT: {
3704
		struct kvm_s390_interrupt s390int;
3705
		struct kvm_s390_irq s390irq;
3706

3707
		r = -EFAULT;
3708
		if (copy_from_user(&s390int, argp, sizeof(s390int)))
3709
			break;
3710 3711 3712
		if (s390int_to_s390irq(&s390int, &s390irq))
			return -EINVAL;
		r = kvm_s390_inject_vcpu(vcpu, &s390irq);
3713
		break;
3714
	}
3715
	case KVM_S390_STORE_STATUS:
3716
		idx = srcu_read_lock(&vcpu->kvm->srcu);
3717
		r = kvm_s390_vcpu_store_status(vcpu, arg);
3718
		srcu_read_unlock(&vcpu->kvm->srcu, idx);
3719
		break;
3720 3721 3722
	case KVM_S390_SET_INITIAL_PSW: {
		psw_t psw;

3723
		r = -EFAULT;
3724
		if (copy_from_user(&psw, argp, sizeof(psw)))
3725 3726 3727
			break;
		r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
		break;
3728 3729
	}
	case KVM_S390_INITIAL_RESET:
3730 3731
		r = kvm_arch_vcpu_ioctl_initial_reset(vcpu);
		break;
3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743
	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;
	}
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 3777 3778 3779
#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
3780
	case KVM_S390_VCPU_FAULT: {
3781
		r = gmap_fault(vcpu->arch.gmap, arg, 0);
3782 3783
		break;
	}
3784 3785 3786 3787 3788 3789 3790 3791 3792
	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;
	}
3793 3794 3795 3796 3797 3798 3799 3800 3801
	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;
	}
3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833
	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;
		}
		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;
		}
		r = kvm_s390_get_irq_state(vcpu,
					   (__u8 __user *)  irq_state.buf,
					   irq_state.len);
		break;
	}
3834
	default:
3835
		r = -ENOTTY;
3836
	}
3837
	return r;
3838 3839
}

3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852
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;
}

3853 3854
int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
			    unsigned long npages)
3855 3856 3857 3858
{
	return 0;
}

3859
/* Section: memory related */
3860 3861
int kvm_arch_prepare_memory_region(struct kvm *kvm,
				   struct kvm_memory_slot *memslot,
3862
				   const struct kvm_userspace_memory_region *mem,
3863
				   enum kvm_mr_change change)
3864
{
3865 3866 3867 3868
	/* 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 */
3869

3870
	if (mem->userspace_addr & 0xffffful)
3871 3872
		return -EINVAL;

3873
	if (mem->memory_size & 0xffffful)
3874 3875
		return -EINVAL;

3876 3877 3878
	if (mem->guest_phys_addr + mem->memory_size > kvm->arch.mem_limit)
		return -EINVAL;

3879 3880 3881 3882
	return 0;
}

void kvm_arch_commit_memory_region(struct kvm *kvm,
3883
				const struct kvm_userspace_memory_region *mem,
3884
				const struct kvm_memory_slot *old,
3885
				const struct kvm_memory_slot *new,
3886
				enum kvm_mr_change change)
3887
{
3888
	int rc;
3889

3890 3891 3892 3893 3894 3895 3896 3897 3898 3899
	/* 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;
3900 3901 3902 3903

	rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr,
		mem->guest_phys_addr, mem->memory_size);
	if (rc)
3904
		pr_warn("failed to commit memory region\n");
3905
	return;
3906 3907
}

3908 3909 3910 3911 3912 3913 3914
static inline unsigned long nonhyp_mask(int i)
{
	unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30;

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

3915 3916 3917 3918 3919
void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu)
{
	vcpu->valid_wakeup = false;
}

3920 3921
static int __init kvm_s390_init(void)
{
3922 3923
	int i;

3924 3925 3926 3927 3928
	if (!sclp.has_sief2) {
		pr_info("SIE not available\n");
		return -ENODEV;
	}

3929 3930 3931 3932
	for (i = 0; i < 16; i++)
		kvm_s390_fac_list_mask[i] |=
			S390_lowcore.stfle_fac_list[i] & nonhyp_mask(i);

3933
	return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
3934 3935 3936 3937 3938 3939 3940 3941 3942
}

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

module_init(kvm_s390_init);
module_exit(kvm_s390_exit);
3943 3944 3945 3946 3947 3948 3949 3950 3951

/*
 * 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");