kvm-s390.c 70.5 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>
#include <linux/module.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 <asm/asm-offsets.h>
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#include <asm/lowcore.h>
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#include <asm/etr.h>
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#include <asm/pgtable.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 "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"
47

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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) },
	{ "exit_program_interruption", VCPU_STAT(exit_program_interruption) },
	{ "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) },
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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_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_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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/* upper facilities limit for kvm */
unsigned long kvm_s390_fac_list_mask[] = {
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	0xffe6fffbfcfdfc40UL,
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	0x005e800000000000UL,
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};
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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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static struct gmap_notifier gmap_notifier;
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debug_info_t *kvm_s390_dbf;
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/* Section: not file related */
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int kvm_arch_hardware_enable(void)
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{
	/* every s390 is virtualization enabled ;-) */
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	return 0;
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}

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static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address);

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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;
		}
	}
	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;
	gmap_register_ipte_notifier(&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_ipte_notifier(&gmap_notifier);
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	atomic_notifier_chain_unregister(&s390_epoch_delta_notifier,
					 &kvm_clock_notifier);
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}

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

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

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	/* 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;
}

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int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
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{
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	int r;

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	switch (ext) {
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	case KVM_CAP_S390_PSW:
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	case KVM_CAP_S390_GMAP:
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	case KVM_CAP_SYNC_MMU:
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#ifdef CONFIG_KVM_S390_UCONTROL
	case KVM_CAP_S390_UCONTROL:
#endif
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	case KVM_CAP_ASYNC_PF:
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	case KVM_CAP_SYNC_REGS:
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	case KVM_CAP_ONE_REG:
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	case KVM_CAP_ENABLE_CAP:
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	case KVM_CAP_S390_CSS_SUPPORT:
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Cornelia Huck 已提交
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	case KVM_CAP_IOEVENTFD:
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	case KVM_CAP_DEVICE_CTRL:
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	case KVM_CAP_ENABLE_CAP_VM:
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	case KVM_CAP_S390_IRQCHIP:
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	case KVM_CAP_VM_ATTRIBUTES:
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	case KVM_CAP_MP_STATE:
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	case KVM_CAP_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:
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	case KVM_CAP_S390_IRQ_STATE:
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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:
		r = KVM_MAX_VCPUS;
		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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	default:
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		r = 0;
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	}
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	return r;
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}

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

	down_read(&gmap->mm->mmap_sem);
	/* 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);

		if (gmap_test_and_clear_dirty(address, gmap))
			mark_page_dirty(kvm, cur_gfn);
	}
	up_read(&gmap->mm->mmap_sem);
}

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

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

	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 int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
{
	int r;

	if (cap->flags)
		return -EINVAL;

	switch (cap->cap) {
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	case KVM_CAP_S390_IRQCHIP:
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		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP");
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		kvm->arch.use_irqchip = 1;
		r = 0;
		break;
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	case KVM_CAP_S390_USER_SIGP:
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		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP");
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		kvm->arch.user_sigp = 1;
		r = 0;
		break;
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	case KVM_CAP_S390_VECTOR_REGISTERS:
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		mutex_lock(&kvm->lock);
		if (atomic_read(&kvm->online_vcpus)) {
			r = -EBUSY;
		} else if (MACHINE_HAS_VX) {
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			set_kvm_facility(kvm->arch.model.fac->mask, 129);
			set_kvm_facility(kvm->arch.model.fac->list, 129);
			r = 0;
		} else
			r = -EINVAL;
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		mutex_unlock(&kvm->lock);
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		VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s",
			 r ? "(not available)" : "(success)");
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		break;
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	case KVM_CAP_S390_USER_STSI:
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		VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI");
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		kvm->arch.user_stsi = 1;
		r = 0;
		break;
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	default:
		r = -EINVAL;
		break;
	}
	return r;
}

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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;
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		VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes",
			 kvm->arch.gmap->asce_end);
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		if (put_user(kvm->arch.gmap->asce_end, (u64 __user *)attr->addr))
			ret = -EFAULT;
		break;
	default:
		ret = -ENXIO;
		break;
	}
	return ret;
}

static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
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{
	int ret;
	unsigned int idx;
	switch (attr->attr) {
	case KVM_S390_VM_MEM_ENABLE_CMMA:
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		/* enable CMMA only for z10 and later (EDAT_1) */
		ret = -EINVAL;
		if (!MACHINE_IS_LPAR || !MACHINE_HAS_EDAT1)
			break;

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		ret = -EBUSY;
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		VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support");
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		mutex_lock(&kvm->lock);
		if (atomic_read(&kvm->online_vcpus) == 0) {
			kvm->arch.use_cmma = 1;
			ret = 0;
		}
		mutex_unlock(&kvm->lock);
		break;
	case KVM_S390_VM_MEM_CLR_CMMA:
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		ret = -EINVAL;
		if (!kvm->arch.use_cmma)
			break;

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		VM_EVENT(kvm, 3, "%s", "RESET: CMMA states");
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		mutex_lock(&kvm->lock);
		idx = srcu_read_lock(&kvm->srcu);
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		s390_reset_cmma(kvm->arch.gmap->mm);
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		srcu_read_unlock(&kvm->srcu, idx);
		mutex_unlock(&kvm->lock);
		ret = 0;
		break;
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	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;

		if (new_limit > kvm->arch.gmap->asce_end)
			return -E2BIG;

		ret = -EBUSY;
		mutex_lock(&kvm->lock);
		if (atomic_read(&kvm->online_vcpus) == 0) {
			/* gmap_alloc will round the limit up */
			struct gmap *new = gmap_alloc(current->mm, new_limit);

			if (!new) {
				ret = -ENOMEM;
			} else {
				gmap_free(kvm->arch.gmap);
				new->private = kvm;
				kvm->arch.gmap = new;
				ret = 0;
			}
		}
		mutex_unlock(&kvm->lock);
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		VM_EVENT(kvm, 3, "SET: max guest memory: %lu bytes", new_limit);
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		break;
	}
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	default:
		ret = -ENXIO;
		break;
	}
	return ret;
}

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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;

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	if (!test_kvm_facility(kvm, 76))
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		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;
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		VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support");
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		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;
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		VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support");
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		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));
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		VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support");
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		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));
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		VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support");
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		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;
}

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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;
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	VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high);
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	return 0;
}

static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
{
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	u64 gtod;
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	if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
		return -EFAULT;

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	kvm_s390_set_tod_clock(kvm, gtod);
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	VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod);
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	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) {
	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;
}

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;
568
	VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high);
569 570 571 572 573 574

	return 0;
}

static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
{
575
	u64 gtod;
576

577
	gtod = kvm_s390_get_tod_clock_fast(kvm);
578 579
	if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
		return -EFAULT;
580
	VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod);
581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605

	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) {
	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;
}

606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625
static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr)
{
	struct kvm_s390_vm_cpu_processor *proc;
	int ret = 0;

	mutex_lock(&kvm->lock);
	if (atomic_read(&kvm->online_vcpus)) {
		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))) {
		memcpy(&kvm->arch.model.cpu_id, &proc->cpuid,
		       sizeof(struct cpuid));
		kvm->arch.model.ibc = proc->ibc;
626
		memcpy(kvm->arch.model.fac->list, proc->fac_list,
627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659
		       S390_ARCH_FAC_LIST_SIZE_BYTE);
	} else
		ret = -EFAULT;
	kfree(proc);
out:
	mutex_unlock(&kvm->lock);
	return ret;
}

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;
	}
	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;
	}
	memcpy(&proc->cpuid, &kvm->arch.model.cpu_id, sizeof(struct cpuid));
	proc->ibc = kvm->arch.model.ibc;
660
	memcpy(&proc->fac_list, kvm->arch.model.fac->list, S390_ARCH_FAC_LIST_SIZE_BYTE);
661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678
	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);
679
	mach->ibc = sclp.ibc;
680 681
	memcpy(&mach->fac_mask, kvm->arch.model.fac->mask,
	       S390_ARCH_FAC_LIST_SIZE_BYTE);
682
	memcpy((unsigned long *)&mach->fac_list, S390_lowcore.stfle_fac_list,
683
	       S390_ARCH_FAC_LIST_SIZE_BYTE);
684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705
	if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach)))
		ret = -EFAULT;
	kfree(mach);
out:
	return ret;
}

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;
	}
	return ret;
}

706 707 708 709 710
static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
	int ret;

	switch (attr->group) {
711
	case KVM_S390_VM_MEM_CTRL:
712
		ret = kvm_s390_set_mem_control(kvm, attr);
713
		break;
714 715 716
	case KVM_S390_VM_TOD:
		ret = kvm_s390_set_tod(kvm, attr);
		break;
717 718 719
	case KVM_S390_VM_CPU_MODEL:
		ret = kvm_s390_set_cpu_model(kvm, attr);
		break;
720 721 722
	case KVM_S390_VM_CRYPTO:
		ret = kvm_s390_vm_set_crypto(kvm, attr);
		break;
723 724 725 726 727 728 729 730 731 732
	default:
		ret = -ENXIO;
		break;
	}

	return ret;
}

static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
733 734 735 736 737 738
	int ret;

	switch (attr->group) {
	case KVM_S390_VM_MEM_CTRL:
		ret = kvm_s390_get_mem_control(kvm, attr);
		break;
739 740 741
	case KVM_S390_VM_TOD:
		ret = kvm_s390_get_tod(kvm, attr);
		break;
742 743 744
	case KVM_S390_VM_CPU_MODEL:
		ret = kvm_s390_get_cpu_model(kvm, attr);
		break;
745 746 747 748 749 750
	default:
		ret = -ENXIO;
		break;
	}

	return ret;
751 752 753 754 755 756 757
}

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

	switch (attr->group) {
758 759 760 761
	case KVM_S390_VM_MEM_CTRL:
		switch (attr->attr) {
		case KVM_S390_VM_MEM_ENABLE_CMMA:
		case KVM_S390_VM_MEM_CLR_CMMA:
762
		case KVM_S390_VM_MEM_LIMIT_SIZE:
763 764 765 766 767 768 769
			ret = 0;
			break;
		default:
			ret = -ENXIO;
			break;
		}
		break;
770 771 772 773 774 775 776 777 778 779 780
	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;
781 782 783 784 785 786 787 788 789 790 791
	case KVM_S390_VM_CPU_MODEL:
		switch (attr->attr) {
		case KVM_S390_VM_CPU_PROCESSOR:
		case KVM_S390_VM_CPU_MACHINE:
			ret = 0;
			break;
		default:
			ret = -ENXIO;
			break;
		}
		break;
792 793 794 795 796 797 798 799 800 801 802 803 804
	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;
805 806 807 808 809 810 811 812
	default:
		ret = -ENXIO;
		break;
	}

	return ret;
}

813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889
static long kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
{
	uint8_t *keys;
	uint64_t hva;
	unsigned long curkey;
	int i, r = 0;

	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;

	keys = kmalloc_array(args->count, sizeof(uint8_t),
			     GFP_KERNEL | __GFP_NOWARN);
	if (!keys)
		keys = vmalloc(sizeof(uint8_t) * args->count);
	if (!keys)
		return -ENOMEM;

	for (i = 0; i < args->count; i++) {
		hva = gfn_to_hva(kvm, args->start_gfn + i);
		if (kvm_is_error_hva(hva)) {
			r = -EFAULT;
			goto out;
		}

		curkey = get_guest_storage_key(current->mm, hva);
		if (IS_ERR_VALUE(curkey)) {
			r = curkey;
			goto out;
		}
		keys[i] = curkey;
	}

	r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys,
			 sizeof(uint8_t) * args->count);
	if (r)
		r = -EFAULT;
out:
	kvfree(keys);
	return r;
}

static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
{
	uint8_t *keys;
	uint64_t hva;
	int i, r = 0;

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

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

	keys = kmalloc_array(args->count, sizeof(uint8_t),
			     GFP_KERNEL | __GFP_NOWARN);
	if (!keys)
		keys = vmalloc(sizeof(uint8_t) * args->count);
	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 */
890 891 892
	r = s390_enable_skey();
	if (r)
		goto out;
893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916

	for (i = 0; i < args->count; i++) {
		hva = gfn_to_hva(kvm, args->start_gfn + i);
		if (kvm_is_error_hva(hva)) {
			r = -EFAULT;
			goto out;
		}

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

		r = set_guest_storage_key(current->mm, hva,
					  (unsigned long)keys[i], 0);
		if (r)
			goto out;
	}
out:
	kvfree(keys);
	return r;
}

917 918 919 920 921
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;
922
	struct kvm_device_attr attr;
923 924 925
	int r;

	switch (ioctl) {
926 927 928 929 930 931 932 933 934
	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;
	}
935 936 937 938 939 940 941 942
	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;
	}
943 944 945 946 947 948 949
	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));
950
			r = kvm_set_irq_routing(kvm, &routing, 0, 0);
951 952 953
		}
		break;
	}
954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974
	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;
	}
975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994
	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;
	}
995
	default:
996
		r = -ENOTTY;
997 998 999 1000 1001
	}

	return r;
}

1002 1003 1004
static int kvm_s390_query_ap_config(u8 *config)
{
	u32 fcn_code = 0x04000000UL;
1005
	u32 cc = 0;
1006

1007
	memset(config, 0, 128);
1008 1009 1010 1011
	asm volatile(
		"lgr 0,%1\n"
		"lgr 2,%2\n"
		".long 0xb2af0000\n"		/* PQAP(QCI) */
1012
		"0: ipm %0\n"
1013
		"srl %0,28\n"
1014 1015 1016
		"1:\n"
		EX_TABLE(0b, 1b)
		: "+r" (cc)
1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050
		: "r" (fcn_code), "r" (config)
		: "cc", "0", "2", "memory"
	);

	return cc;
}

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

	if (test_facility(2) && test_facility(12)) {
		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;
}

1051 1052 1053 1054 1055 1056
static void kvm_s390_get_cpu_id(struct cpuid *cpu_id)
{
	get_cpu_id(cpu_id);
	cpu_id->version = 0xff;
}

1057 1058
static int kvm_s390_crypto_init(struct kvm *kvm)
{
1059
	if (!test_kvm_facility(kvm, 76))
1060 1061 1062 1063 1064 1065 1066
		return 0;

	kvm->arch.crypto.crycb = kzalloc(sizeof(*kvm->arch.crypto.crycb),
					 GFP_KERNEL | GFP_DMA);
	if (!kvm->arch.crypto.crycb)
		return -ENOMEM;

1067
	kvm_s390_set_crycb_format(kvm);
1068

1069 1070 1071 1072 1073 1074 1075
	/* 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));
1076

1077 1078 1079
	return 0;
}

1080
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
1081
{
1082
	int i, rc;
1083
	char debug_name[16];
1084
	static unsigned long sca_offset;
1085

1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096
	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

1097 1098
	rc = s390_enable_sie();
	if (rc)
1099
		goto out_err;
1100

1101 1102
	rc = -ENOMEM;

1103 1104
	kvm->arch.sca = (struct sca_block *) get_zeroed_page(GFP_KERNEL);
	if (!kvm->arch.sca)
1105
		goto out_err;
1106
	spin_lock(&kvm_lock);
1107 1108 1109
	sca_offset += 16;
	if (sca_offset + sizeof(struct sca_block) > PAGE_SIZE)
		sca_offset = 0;
1110 1111
	kvm->arch.sca = (struct sca_block *) ((char *) kvm->arch.sca + sca_offset);
	spin_unlock(&kvm_lock);
1112 1113 1114

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

1115
	kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long));
1116
	if (!kvm->arch.dbf)
1117
		goto out_err;
1118

1119 1120 1121
	/*
	 * The architectural maximum amount of facilities is 16 kbit. To store
	 * this amount, 2 kbyte of memory is required. Thus we need a full
1122 1123
	 * page to hold the guest facility list (arch.model.fac->list) and the
	 * facility mask (arch.model.fac->mask). Its address size has to be
1124 1125 1126
	 * 31 bits and word aligned.
	 */
	kvm->arch.model.fac =
1127
		(struct kvm_s390_fac *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1128
	if (!kvm->arch.model.fac)
1129
		goto out_err;
1130

1131
	/* Populate the facility mask initially. */
1132
	memcpy(kvm->arch.model.fac->mask, S390_lowcore.stfle_fac_list,
1133
	       S390_ARCH_FAC_LIST_SIZE_BYTE);
1134 1135
	for (i = 0; i < S390_ARCH_FAC_LIST_SIZE_U64; i++) {
		if (i < kvm_s390_fac_list_mask_size())
1136
			kvm->arch.model.fac->mask[i] &= kvm_s390_fac_list_mask[i];
1137
		else
1138
			kvm->arch.model.fac->mask[i] = 0UL;
1139 1140
	}

1141 1142 1143 1144
	/* Populate the facility list initially. */
	memcpy(kvm->arch.model.fac->list, kvm->arch.model.fac->mask,
	       S390_ARCH_FAC_LIST_SIZE_BYTE);

1145
	kvm_s390_get_cpu_id(&kvm->arch.model.cpu_id);
1146
	kvm->arch.model.ibc = sclp.ibc & 0x0fff;
1147

1148
	if (kvm_s390_crypto_init(kvm) < 0)
1149
		goto out_err;
1150

1151
	spin_lock_init(&kvm->arch.float_int.lock);
1152 1153
	for (i = 0; i < FIRQ_LIST_COUNT; i++)
		INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
1154
	init_waitqueue_head(&kvm->arch.ipte_wq);
1155
	mutex_init(&kvm->arch.ipte_mutex);
1156

1157
	debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
1158
	VM_EVENT(kvm, 3, "vm created with type %lu", type);
1159

1160 1161 1162
	if (type & KVM_VM_S390_UCONTROL) {
		kvm->arch.gmap = NULL;
	} else {
1163
		kvm->arch.gmap = gmap_alloc(current->mm, (1UL << 44) - 1);
1164
		if (!kvm->arch.gmap)
1165
			goto out_err;
1166
		kvm->arch.gmap->private = kvm;
1167
		kvm->arch.gmap->pfault_enabled = 0;
1168
	}
1169 1170

	kvm->arch.css_support = 0;
1171
	kvm->arch.use_irqchip = 0;
1172
	kvm->arch.epoch = 0;
1173

1174
	spin_lock_init(&kvm->arch.start_stop_lock);
1175
	KVM_EVENT(3, "vm 0x%p created by pid %u", kvm, current->pid);
1176

1177
	return 0;
1178
out_err:
1179
	kfree(kvm->arch.crypto.crycb);
1180
	free_page((unsigned long)kvm->arch.model.fac);
1181
	debug_unregister(kvm->arch.dbf);
1182
	free_page((unsigned long)(kvm->arch.sca));
1183
	KVM_EVENT(3, "creation of vm failed: %d", rc);
1184
	return rc;
1185 1186
}

1187 1188 1189
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
	VCPU_EVENT(vcpu, 3, "%s", "free cpu");
1190
	trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
1191
	kvm_s390_clear_local_irqs(vcpu);
1192
	kvm_clear_async_pf_completion_queue(vcpu);
C
Carsten Otte 已提交
1193
	if (!kvm_is_ucontrol(vcpu->kvm)) {
1194
		sca_del_vcpu(vcpu);
C
Carsten Otte 已提交
1195
	}
1196
	smp_mb();
1197 1198 1199 1200

	if (kvm_is_ucontrol(vcpu->kvm))
		gmap_free(vcpu->arch.gmap);

1201
	if (vcpu->kvm->arch.use_cmma)
1202
		kvm_s390_vcpu_unsetup_cmma(vcpu);
1203
	free_page((unsigned long)(vcpu->arch.sie_block));
1204

1205
	kvm_vcpu_uninit(vcpu);
1206
	kmem_cache_free(kvm_vcpu_cache, vcpu);
1207 1208 1209 1210 1211
}

static void kvm_free_vcpus(struct kvm *kvm)
{
	unsigned int i;
1212
	struct kvm_vcpu *vcpu;
1213

1214 1215 1216 1217 1218 1219 1220 1221 1222
	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);
1223 1224
}

1225 1226
void kvm_arch_destroy_vm(struct kvm *kvm)
{
1227
	kvm_free_vcpus(kvm);
1228
	free_page((unsigned long)kvm->arch.model.fac);
1229
	free_page((unsigned long)(kvm->arch.sca));
1230
	debug_unregister(kvm->arch.dbf);
1231
	kfree(kvm->arch.crypto.crycb);
1232 1233
	if (!kvm_is_ucontrol(kvm))
		gmap_free(kvm->arch.gmap);
1234
	kvm_s390_destroy_adapters(kvm);
1235
	kvm_s390_clear_float_irqs(kvm);
1236
	KVM_EVENT(3, "vm 0x%p destroyed", kvm);
1237 1238 1239
}

/* Section: vcpu related */
1240 1241 1242 1243 1244 1245 1246 1247 1248 1249
static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu)
{
	vcpu->arch.gmap = gmap_alloc(current->mm, -1UL);
	if (!vcpu->arch.gmap)
		return -ENOMEM;
	vcpu->arch.gmap->private = vcpu->kvm;

	return 0;
}

1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275
static void sca_del_vcpu(struct kvm_vcpu *vcpu)
{
	struct sca_block *sca = vcpu->kvm->arch.sca;

	clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
	if (sca->cpu[vcpu->vcpu_id].sda == (__u64) vcpu->arch.sie_block)
		sca->cpu[vcpu->vcpu_id].sda = 0;
}

static void sca_add_vcpu(struct kvm_vcpu *vcpu, struct kvm *kvm,
			unsigned int id)
{
	struct sca_block *sca = kvm->arch.sca;

	if (!sca->cpu[id].sda)
		sca->cpu[id].sda = (__u64) vcpu->arch.sie_block;
	vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
	vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
	set_bit_inv(id, (unsigned long *) &sca->mcn);
}

static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
{
	return id < KVM_MAX_VCPUS;
}

1276 1277
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
1278 1279
	vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
	kvm_clear_async_pf_completion_queue(vcpu);
1280 1281
	vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
				    KVM_SYNC_GPRS |
1282
				    KVM_SYNC_ACRS |
1283 1284 1285
				    KVM_SYNC_CRS |
				    KVM_SYNC_ARCH0 |
				    KVM_SYNC_PFAULT;
1286 1287
	if (test_kvm_facility(vcpu->kvm, 129))
		vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
1288 1289 1290 1291

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

1292 1293 1294
	return 0;
}

1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315
/*
 * Backs up the current FP/VX register save area on a particular
 * destination.  Used to switch between different register save
 * areas.
 */
static inline void save_fpu_to(struct fpu *dst)
{
	dst->fpc = current->thread.fpu.fpc;
	dst->regs = current->thread.fpu.regs;
}

/*
 * Switches the FP/VX register save area from which to lazy
 * restore register contents.
 */
static inline void load_fpu_from(struct fpu *from)
{
	current->thread.fpu.fpc = from->fpc;
	current->thread.fpu.regs = from->regs;
}

1316 1317
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
1318
	/* Save host register state */
1319
	save_fpu_regs();
1320
	save_fpu_to(&vcpu->arch.host_fpregs);
1321

1322
	if (test_kvm_facility(vcpu->kvm, 129)) {
1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333
		current->thread.fpu.fpc = vcpu->run->s.regs.fpc;
		/*
		 * Use the register save area in the SIE-control block
		 * for register restore and save in kvm_arch_vcpu_put()
		 */
		current->thread.fpu.vxrs =
			(__vector128 *)&vcpu->run->s.regs.vrs;
	} else
		load_fpu_from(&vcpu->arch.guest_fpregs);

	if (test_fp_ctl(current->thread.fpu.fpc))
1334
		/* User space provided an invalid FPC, let's clear it */
1335 1336 1337
		current->thread.fpu.fpc = 0;

	save_access_regs(vcpu->arch.host_acrs);
1338
	restore_access_regs(vcpu->run->s.regs.acrs);
1339
	gmap_enable(vcpu->arch.gmap);
1340
	atomic_or(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
1341 1342 1343 1344
}

void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
1345
	atomic_andnot(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
1346
	gmap_disable(vcpu->arch.gmap);
1347

1348
	save_fpu_regs();
1349

1350
	if (test_kvm_facility(vcpu->kvm, 129))
1351 1352 1353 1354 1355 1356 1357
		/*
		 * kvm_arch_vcpu_load() set up the register save area to
		 * the &vcpu->run->s.regs.vrs and, thus, the vector registers
		 * are already saved.  Only the floating-point control must be
		 * copied.
		 */
		vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
1358
	else
1359 1360 1361 1362
		save_fpu_to(&vcpu->arch.guest_fpregs);
	load_fpu_from(&vcpu->arch.host_fpregs);

	save_access_regs(vcpu->run->s.regs.acrs);
1363 1364 1365 1366 1367 1368 1369 1370
	restore_access_regs(vcpu->arch.host_acrs);
}

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;
1371
	kvm_s390_set_prefix(vcpu, 0);
1372 1373 1374 1375 1376 1377 1378 1379 1380
	vcpu->arch.sie_block->cputm     = 0UL;
	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;
	vcpu->arch.guest_fpregs.fpc = 0;
	asm volatile("lfpc %0" : : "Q" (vcpu->arch.guest_fpregs.fpc));
	vcpu->arch.sie_block->gbea = 1;
1381
	vcpu->arch.sie_block->pp = 0;
1382 1383
	vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
	kvm_clear_async_pf_completion_queue(vcpu);
1384 1385
	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
		kvm_s390_vcpu_stop(vcpu);
1386
	kvm_s390_clear_local_irqs(vcpu);
1387 1388
}

1389
void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
1390
{
1391
	mutex_lock(&vcpu->kvm->lock);
1392
	preempt_disable();
1393
	vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch;
1394
	preempt_enable();
1395
	mutex_unlock(&vcpu->kvm->lock);
1396 1397
	if (!kvm_is_ucontrol(vcpu->kvm))
		vcpu->arch.gmap = vcpu->kvm->arch.gmap;
1398 1399
}

1400 1401
static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
{
1402
	if (!test_kvm_facility(vcpu->kvm, 76))
1403 1404
		return;

1405 1406 1407 1408 1409 1410 1411
	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;

1412 1413 1414
	vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
}

1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431
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;

	vcpu->arch.sie_block->ecb2 |= 0x80;
	vcpu->arch.sie_block->ecb2 &= ~0x08;
	return 0;
}

1432 1433 1434 1435 1436 1437 1438 1439 1440
static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu)
{
	struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model;

	vcpu->arch.cpu_id = model->cpu_id;
	vcpu->arch.sie_block->ibc = model->ibc;
	vcpu->arch.sie_block->fac = (int) (long) model->fac->list;
}

1441 1442
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
1443
	int rc = 0;
1444

1445 1446
	atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
						    CPUSTAT_SM |
1447 1448
						    CPUSTAT_STOPPED);

1449
	if (test_kvm_facility(vcpu->kvm, 78))
1450
		atomic_or(CPUSTAT_GED2, &vcpu->arch.sie_block->cpuflags);
1451
	else if (test_kvm_facility(vcpu->kvm, 8))
1452
		atomic_or(CPUSTAT_GED, &vcpu->arch.sie_block->cpuflags);
1453

1454 1455
	kvm_s390_vcpu_setup_model(vcpu);

1456
	vcpu->arch.sie_block->ecb   = 6;
1457
	if (test_kvm_facility(vcpu->kvm, 50) && test_kvm_facility(vcpu->kvm, 73))
1458 1459
		vcpu->arch.sie_block->ecb |= 0x10;

1460
	vcpu->arch.sie_block->ecb2  = 8;
1461
	vcpu->arch.sie_block->eca   = 0xC1002000U;
1462
	if (sclp.has_siif)
1463
		vcpu->arch.sie_block->eca |= 1;
1464
	if (sclp.has_sigpif)
1465
		vcpu->arch.sie_block->eca |= 0x10000000U;
1466
	if (test_kvm_facility(vcpu->kvm, 129)) {
1467 1468 1469
		vcpu->arch.sie_block->eca |= 0x00020000;
		vcpu->arch.sie_block->ecd |= 0x20000000;
	}
1470
	vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
1471

1472
	if (vcpu->kvm->arch.use_cmma) {
1473 1474 1475
		rc = kvm_s390_vcpu_setup_cmma(vcpu);
		if (rc)
			return rc;
1476
	}
1477
	hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1478
	vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
1479

1480 1481
	kvm_s390_vcpu_crypto_setup(vcpu);

1482
	return rc;
1483 1484 1485 1486 1487
}

struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
				      unsigned int id)
{
1488
	struct kvm_vcpu *vcpu;
1489
	struct sie_page *sie_page;
1490 1491
	int rc = -EINVAL;

1492
	if (!sca_can_add_vcpu(kvm, id))
1493 1494 1495
		goto out;

	rc = -ENOMEM;
1496

1497
	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
1498
	if (!vcpu)
1499
		goto out;
1500

1501 1502
	sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL);
	if (!sie_page)
1503 1504
		goto out_free_cpu;

1505 1506 1507
	vcpu->arch.sie_block = &sie_page->sie_block;
	vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb;

1508
	vcpu->arch.sie_block->icpua = id;
C
Carsten Otte 已提交
1509 1510 1511 1512 1513
	if (!kvm_is_ucontrol(kvm)) {
		if (!kvm->arch.sca) {
			WARN_ON_ONCE(1);
			goto out_free_cpu;
		}
1514
		sca_add_vcpu(vcpu, kvm, id);
C
Carsten Otte 已提交
1515
	}
1516

1517 1518
	spin_lock_init(&vcpu->arch.local_int.lock);
	vcpu->arch.local_int.float_int = &kvm->arch.float_int;
1519
	vcpu->arch.local_int.wq = &vcpu->wq;
1520
	vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags;
1521

1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534
	/*
	 * Allocate a save area for floating-point registers.  If the vector
	 * extension is available, register contents are saved in the SIE
	 * control block.  The allocated save area is still required in
	 * particular places, for example, in kvm_s390_vcpu_store_status().
	 */
	vcpu->arch.guest_fpregs.fprs = kzalloc(sizeof(freg_t) * __NUM_FPRS,
					       GFP_KERNEL);
	if (!vcpu->arch.guest_fpregs.fprs) {
		rc = -ENOMEM;
		goto out_free_sie_block;
	}

1535 1536
	rc = kvm_vcpu_init(vcpu, kvm, id);
	if (rc)
1537
		goto out_free_sie_block;
1538 1539
	VM_EVENT(kvm, 3, "create cpu %d at %p, sie block at %p", id, vcpu,
		 vcpu->arch.sie_block);
1540
	trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);
1541 1542

	return vcpu;
1543 1544
out_free_sie_block:
	free_page((unsigned long)(vcpu->arch.sie_block));
1545
out_free_cpu:
1546
	kmem_cache_free(kvm_vcpu_cache, vcpu);
1547
out:
1548 1549 1550 1551 1552
	return ERR_PTR(rc);
}

int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
1553
	return kvm_s390_vcpu_has_irq(vcpu, 0);
1554 1555
}

1556
void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu)
1557
{
1558
	atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
1559
	exit_sie(vcpu);
1560 1561
}

1562
void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu)
1563
{
1564
	atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
1565 1566
}

1567 1568
static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu)
{
1569
	atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
1570
	exit_sie(vcpu);
1571 1572 1573 1574
}

static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu)
{
1575
	atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
1576 1577
}

1578 1579 1580 1581 1582 1583
/*
 * 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)
{
1584
	atomic_or(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags);
1585 1586 1587 1588
	while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE)
		cpu_relax();
}

1589 1590
/* Kick a guest cpu out of SIE to process a request synchronously */
void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu)
1591
{
1592 1593
	kvm_make_request(req, vcpu);
	kvm_s390_vcpu_request(vcpu);
1594 1595
}

1596 1597 1598 1599 1600 1601 1602 1603
static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address)
{
	int i;
	struct kvm *kvm = gmap->private;
	struct kvm_vcpu *vcpu;

	kvm_for_each_vcpu(i, vcpu, kvm) {
		/* match against both prefix pages */
1604
		if (kvm_s390_get_prefix(vcpu) == (address & ~0x1000UL)) {
1605
			VCPU_EVENT(vcpu, 2, "gmap notifier for %lx", address);
1606
			kvm_s390_sync_request(KVM_REQ_MMU_RELOAD, vcpu);
1607 1608 1609 1610
		}
	}
}

1611 1612 1613 1614 1615 1616 1617
int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
{
	/* kvm common code refers to this, but never calls it */
	BUG();
	return 0;
}

1618 1619 1620 1621 1622 1623
static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
					   struct kvm_one_reg *reg)
{
	int r = -EINVAL;

	switch (reg->id) {
1624 1625 1626 1627 1628 1629 1630 1631
	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;
1632 1633 1634 1635 1636 1637 1638 1639
	case KVM_REG_S390_CPU_TIMER:
		r = put_user(vcpu->arch.sie_block->cputm,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_CLOCK_COMP:
		r = put_user(vcpu->arch.sie_block->ckc,
			     (u64 __user *)reg->addr);
		break;
1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651
	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;
1652 1653 1654 1655
	case KVM_REG_S390_PP:
		r = put_user(vcpu->arch.sie_block->pp,
			     (u64 __user *)reg->addr);
		break;
1656 1657 1658 1659
	case KVM_REG_S390_GBEA:
		r = put_user(vcpu->arch.sie_block->gbea,
			     (u64 __user *)reg->addr);
		break;
1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672
	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;

	switch (reg->id) {
1673 1674 1675 1676 1677 1678 1679 1680
	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;
1681 1682 1683 1684 1685 1686 1687 1688
	case KVM_REG_S390_CPU_TIMER:
		r = get_user(vcpu->arch.sie_block->cputm,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_CLOCK_COMP:
		r = get_user(vcpu->arch.sie_block->ckc,
			     (u64 __user *)reg->addr);
		break;
1689 1690 1691
	case KVM_REG_S390_PFTOKEN:
		r = get_user(vcpu->arch.pfault_token,
			     (u64 __user *)reg->addr);
1692 1693
		if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
			kvm_clear_async_pf_completion_queue(vcpu);
1694 1695 1696 1697 1698 1699 1700 1701 1702
		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;
1703 1704 1705 1706
	case KVM_REG_S390_PP:
		r = get_user(vcpu->arch.sie_block->pp,
			     (u64 __user *)reg->addr);
		break;
1707 1708 1709 1710
	case KVM_REG_S390_GBEA:
		r = get_user(vcpu->arch.sie_block->gbea,
			     (u64 __user *)reg->addr);
		break;
1711 1712 1713 1714 1715 1716
	default:
		break;
	}

	return r;
}
1717

1718 1719 1720 1721 1722 1723 1724 1725
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)
{
1726
	memcpy(&vcpu->run->s.regs.gprs, &regs->gprs, sizeof(regs->gprs));
1727 1728 1729 1730 1731
	return 0;
}

int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
1732
	memcpy(&regs->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
1733 1734 1735 1736 1737 1738
	return 0;
}

int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs)
{
1739
	memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
1740
	memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
1741
	restore_access_regs(vcpu->run->s.regs.acrs);
1742 1743 1744 1745 1746 1747
	return 0;
}

int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs)
{
1748
	memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
1749 1750 1751 1752 1753 1754
	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)
{
1755 1756
	if (test_fp_ctl(fpu->fpc))
		return -EINVAL;
1757
	memcpy(vcpu->arch.guest_fpregs.fprs, &fpu->fprs, sizeof(fpu->fprs));
1758
	vcpu->arch.guest_fpregs.fpc = fpu->fpc;
1759
	save_fpu_regs();
1760
	load_fpu_from(&vcpu->arch.guest_fpregs);
1761 1762 1763 1764 1765
	return 0;
}

int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
1766
	memcpy(&fpu->fprs, vcpu->arch.guest_fpregs.fprs, sizeof(fpu->fprs));
1767 1768 1769 1770 1771 1772 1773 1774
	fpu->fpc = vcpu->arch.guest_fpregs.fpc;
	return 0;
}

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

1775
	if (!is_vcpu_stopped(vcpu))
1776
		rc = -EBUSY;
1777 1778 1779 1780
	else {
		vcpu->run->psw_mask = psw.mask;
		vcpu->run->psw_addr = psw.addr;
	}
1781 1782 1783 1784 1785 1786 1787 1788 1789
	return rc;
}

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

1790 1791 1792 1793
#define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \
			      KVM_GUESTDBG_USE_HW_BP | \
			      KVM_GUESTDBG_ENABLE)

J
Jan Kiszka 已提交
1794 1795
int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
					struct kvm_guest_debug *dbg)
1796
{
1797 1798 1799 1800 1801
	int rc = 0;

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

1802
	if (dbg->control & ~VALID_GUESTDBG_FLAGS)
1803 1804 1805 1806 1807
		return -EINVAL;

	if (dbg->control & KVM_GUESTDBG_ENABLE) {
		vcpu->guest_debug = dbg->control;
		/* enforce guest PER */
1808
		atomic_or(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
1809 1810 1811 1812

		if (dbg->control & KVM_GUESTDBG_USE_HW_BP)
			rc = kvm_s390_import_bp_data(vcpu, dbg);
	} else {
1813
		atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
1814 1815 1816 1817 1818 1819
		vcpu->arch.guestdbg.last_bp = 0;
	}

	if (rc) {
		vcpu->guest_debug = 0;
		kvm_s390_clear_bp_data(vcpu);
1820
		atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
1821 1822 1823
	}

	return rc;
1824 1825
}

1826 1827 1828
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
				    struct kvm_mp_state *mp_state)
{
1829 1830 1831
	/* CHECK_STOP and LOAD are not supported yet */
	return is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED :
				       KVM_MP_STATE_OPERATING;
1832 1833 1834 1835 1836
}

int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
				    struct kvm_mp_state *mp_state)
{
1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856
	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;
1857 1858
}

1859 1860 1861 1862 1863
static bool ibs_enabled(struct kvm_vcpu *vcpu)
{
	return atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_IBS;
}

1864 1865
static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
{
1866
retry:
1867
	kvm_s390_vcpu_request_handled(vcpu);
1868 1869
	if (!vcpu->requests)
		return 0;
1870 1871 1872 1873 1874 1875 1876
	/*
	 * We use MMU_RELOAD just to re-arm the ipte notifier for the
	 * guest prefix page. gmap_ipte_notify will wait on the ptl lock.
	 * 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.
	 */
1877
	if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) {
1878 1879
		int rc;
		rc = gmap_ipte_notify(vcpu->arch.gmap,
1880
				      kvm_s390_get_prefix(vcpu),
1881 1882 1883
				      PAGE_SIZE * 2);
		if (rc)
			return rc;
1884
		goto retry;
1885
	}
1886

1887 1888 1889 1890 1891
	if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
		vcpu->arch.sie_block->ihcpu = 0xffff;
		goto retry;
	}

1892 1893 1894
	if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) {
		if (!ibs_enabled(vcpu)) {
			trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1);
1895
			atomic_or(CPUSTAT_IBS,
1896 1897 1898
					&vcpu->arch.sie_block->cpuflags);
		}
		goto retry;
1899
	}
1900 1901 1902 1903

	if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) {
		if (ibs_enabled(vcpu)) {
			trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0);
1904
			atomic_andnot(CPUSTAT_IBS,
1905 1906 1907 1908 1909
					  &vcpu->arch.sie_block->cpuflags);
		}
		goto retry;
	}

1910 1911 1912
	/* nothing to do, just clear the request */
	clear_bit(KVM_REQ_UNHALT, &vcpu->requests);

1913 1914 1915
	return 0;
}

1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931
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);
}

1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942
/**
 * 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)
1943
{
1944 1945
	return gmap_fault(vcpu->arch.gmap, gpa,
			  writable ? FAULT_FLAG_WRITE : 0);
1946 1947
}

1948 1949 1950 1951
static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token,
				      unsigned long token)
{
	struct kvm_s390_interrupt inti;
1952
	struct kvm_s390_irq irq;
1953 1954

	if (start_token) {
1955 1956 1957
		irq.u.ext.ext_params2 = token;
		irq.type = KVM_S390_INT_PFAULT_INIT;
		WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq));
1958 1959
	} else {
		inti.type = KVM_S390_INT_PFAULT_DONE;
1960
		inti.parm64 = token;
1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006
		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;
2007
	if (kvm_s390_vcpu_has_irq(vcpu, 0))
2008 2009 2010 2011 2012 2013
		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
2014 2015 2016
	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))
2017 2018 2019 2020 2021 2022
		return 0;

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

2023
static int vcpu_pre_run(struct kvm_vcpu *vcpu)
2024
{
2025
	int rc, cpuflags;
2026

2027 2028 2029 2030 2031 2032 2033
	/*
	 * 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);

2034
	memcpy(&vcpu->arch.sie_block->gg14, &vcpu->run->s.regs.gprs[14], 16);
2035 2036 2037 2038

	if (need_resched())
		schedule();

2039
	if (test_cpu_flag(CIF_MCCK_PENDING))
2040 2041
		s390_handle_mcck();

2042 2043 2044 2045 2046
	if (!kvm_is_ucontrol(vcpu->kvm)) {
		rc = kvm_s390_deliver_pending_interrupts(vcpu);
		if (rc)
			return rc;
	}
C
Carsten Otte 已提交
2047

2048 2049 2050 2051
	rc = kvm_s390_handle_requests(vcpu);
	if (rc)
		return rc;

2052 2053 2054 2055 2056
	if (guestdbg_enabled(vcpu)) {
		kvm_s390_backup_guest_per_regs(vcpu);
		kvm_s390_patch_guest_per_regs(vcpu);
	}

2057
	vcpu->arch.sie_block->icptcode = 0;
2058 2059 2060
	cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
	VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags);
	trace_kvm_s390_sie_enter(vcpu, cpuflags);
2061

2062 2063 2064
	return 0;
}

2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081
static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu)
{
	psw_t *psw = &vcpu->arch.sie_block->gpsw;
	u8 opcode;
	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.
	 */
2082
	rc = read_guest(vcpu, psw->addr, 0, &opcode, 1);
2083 2084 2085 2086 2087 2088 2089
	if (rc)
		return kvm_s390_inject_prog_cond(vcpu, rc);
	psw->addr = __rewind_psw(*psw, -insn_length(opcode));

	return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
}

2090 2091
static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason)
{
2092 2093 2094 2095
	VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
		   vcpu->arch.sie_block->icptcode);
	trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);

2096 2097 2098
	if (guestdbg_enabled(vcpu))
		kvm_s390_restore_guest_per_regs(vcpu);

2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113
	memcpy(&vcpu->run->s.regs.gprs[14], &vcpu->arch.sie_block->gg14, 16);

	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;
2114 2115 2116 2117 2118
	} 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;
2119
		return -EREMOTE;
2120
	} else if (current->thread.gmap_pfault) {
2121
		trace_kvm_s390_major_guest_pfault(vcpu);
2122
		current->thread.gmap_pfault = 0;
2123 2124 2125
		if (kvm_arch_setup_async_pf(vcpu))
			return 0;
		return kvm_arch_fault_in_page(vcpu, current->thread.gmap_addr, 1);
2126
	}
2127
	return vcpu_post_run_fault_in_sie(vcpu);
2128 2129 2130 2131 2132 2133
}

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

2134 2135 2136 2137 2138 2139
	/*
	 * 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);

2140 2141 2142 2143
	do {
		rc = vcpu_pre_run(vcpu);
		if (rc)
			break;
2144

2145
		srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
2146 2147 2148 2149
		/*
		 * As PF_VCPU will be used in fault handler, between
		 * guest_enter and guest_exit should be no uaccess.
		 */
2150 2151 2152
		local_irq_disable();
		__kvm_guest_enter();
		local_irq_enable();
2153 2154
		exit_reason = sie64a(vcpu->arch.sie_block,
				     vcpu->run->s.regs.gprs);
2155 2156 2157
		local_irq_disable();
		__kvm_guest_exit();
		local_irq_enable();
2158
		vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
2159 2160

		rc = vcpu_post_run(vcpu, exit_reason);
2161
	} while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc);
2162

2163
	srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
2164
	return rc;
2165 2166
}

2167 2168 2169 2170 2171 2172 2173 2174
static void sync_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	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);
2175 2176
		/* some control register changes require a tlb flush */
		kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188
	}
	if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
		vcpu->arch.sie_block->cputm = kvm_run->s.regs.cputm;
		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;
2189 2190
		if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
			kvm_clear_async_pf_completion_queue(vcpu);
2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210
	}
	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);
	kvm_run->s.regs.cputm = vcpu->arch.sie_block->cputm;
	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;
}

2211 2212
int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
2213
	int rc;
2214 2215
	sigset_t sigsaved;

2216 2217 2218 2219 2220
	if (guestdbg_exit_pending(vcpu)) {
		kvm_s390_prepare_debug_exit(vcpu);
		return 0;
	}

2221 2222 2223
	if (vcpu->sigset_active)
		sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);

2224 2225 2226
	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) {
		kvm_s390_vcpu_start(vcpu);
	} else if (is_vcpu_stopped(vcpu)) {
2227
		pr_err_ratelimited("can't run stopped vcpu %d\n",
2228 2229 2230
				   vcpu->vcpu_id);
		return -EINVAL;
	}
2231

2232
	sync_regs(vcpu, kvm_run);
2233

2234
	might_fault();
2235
	rc = __vcpu_run(vcpu);
2236

2237 2238
	if (signal_pending(current) && !rc) {
		kvm_run->exit_reason = KVM_EXIT_INTR;
2239
		rc = -EINTR;
2240
	}
2241

2242 2243 2244 2245 2246
	if (guestdbg_exit_pending(vcpu) && !rc)  {
		kvm_s390_prepare_debug_exit(vcpu);
		rc = 0;
	}

2247
	if (rc == -EREMOTE) {
2248
		/* userspace support is needed, kvm_run has been prepared */
2249 2250
		rc = 0;
	}
2251

2252
	store_regs(vcpu, kvm_run);
2253

2254 2255 2256 2257
	if (vcpu->sigset_active)
		sigprocmask(SIG_SETMASK, &sigsaved, NULL);

	vcpu->stat.exit_userspace++;
2258
	return rc;
2259 2260 2261 2262 2263 2264 2265 2266
}

/*
 * 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
 */
2267
int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa)
2268
{
2269
	unsigned char archmode = 1;
2270
	unsigned int px;
2271
	u64 clkcomp;
2272
	int rc;
2273

2274 2275
	if (gpa == KVM_S390_STORE_STATUS_NOADDR) {
		if (write_guest_abs(vcpu, 163, &archmode, 1))
2276
			return -EFAULT;
2277 2278 2279
		gpa = SAVE_AREA_BASE;
	} else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) {
		if (write_guest_real(vcpu, 163, &archmode, 1))
2280
			return -EFAULT;
2281 2282 2283 2284 2285 2286 2287 2288
		gpa = kvm_s390_real_to_abs(vcpu, SAVE_AREA_BASE);
	}
	rc = write_guest_abs(vcpu, gpa + offsetof(struct save_area, fp_regs),
			     vcpu->arch.guest_fpregs.fprs, 128);
	rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, gp_regs),
			      vcpu->run->s.regs.gprs, 128);
	rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, psw),
			      &vcpu->arch.sie_block->gpsw, 16);
2289
	px = kvm_s390_get_prefix(vcpu);
2290
	rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, pref_reg),
2291
			      &px, 4);
2292 2293 2294 2295 2296 2297 2298
	rc |= write_guest_abs(vcpu,
			      gpa + offsetof(struct save_area, fp_ctrl_reg),
			      &vcpu->arch.guest_fpregs.fpc, 4);
	rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, tod_reg),
			      &vcpu->arch.sie_block->todpr, 4);
	rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, timer),
			      &vcpu->arch.sie_block->cputm, 8);
2299
	clkcomp = vcpu->arch.sie_block->ckc >> 8;
2300 2301 2302 2303 2304 2305 2306
	rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, clk_cmp),
			      &clkcomp, 8);
	rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, acc_regs),
			      &vcpu->run->s.regs.acrs, 64);
	rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, ctrl_regs),
			      &vcpu->arch.sie_block->gcr, 128);
	return rc ? -EFAULT : 0;
2307 2308
}

2309 2310 2311 2312 2313 2314 2315
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
	 * copying in vcpu load/put. Lets update our copies before we save
	 * it into the save area
	 */
2316
	save_fpu_regs();
2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329
	if (test_kvm_facility(vcpu->kvm, 129)) {
		/*
		 * If the vector extension is available, the vector registers
		 * which overlaps with floating-point registers are saved in
		 * the SIE-control block.  Hence, extract the floating-point
		 * registers and the FPC value and store them in the
		 * guest_fpregs structure.
		 */
		vcpu->arch.guest_fpregs.fpc = current->thread.fpu.fpc;
		convert_vx_to_fp(vcpu->arch.guest_fpregs.fprs,
				 current->thread.fpu.vxrs);
	} else
		save_fpu_to(&vcpu->arch.guest_fpregs);
2330 2331 2332 2333 2334
	save_access_regs(vcpu->run->s.regs.acrs);

	return kvm_s390_store_status_unloaded(vcpu, addr);
}

E
Eric Farman 已提交
2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355
/*
 * store additional status at address
 */
int kvm_s390_store_adtl_status_unloaded(struct kvm_vcpu *vcpu,
					unsigned long gpa)
{
	/* Only bits 0-53 are used for address formation */
	if (!(gpa & ~0x3ff))
		return 0;

	return write_guest_abs(vcpu, gpa & ~0x3ff,
			       (void *)&vcpu->run->s.regs.vrs, 512);
}

int kvm_s390_vcpu_store_adtl_status(struct kvm_vcpu *vcpu, unsigned long addr)
{
	if (!test_kvm_facility(vcpu->kvm, 129))
		return 0;

	/*
	 * The guest VXRS are in the host VXRs due to the lazy
2356 2357 2358 2359 2360
	 * copying in vcpu load/put. We can simply call save_fpu_regs()
	 * to save the current register state because we are in the
	 * middle of a load/put cycle.
	 *
	 * Let's update our copies before we save it into the save area.
E
Eric Farman 已提交
2361
	 */
2362
	save_fpu_regs();
E
Eric Farman 已提交
2363 2364 2365 2366

	return kvm_s390_store_adtl_status_unloaded(vcpu, addr);
}

2367 2368 2369
static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
{
	kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu);
2370
	kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu);
2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385
}

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)
{
	kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu);
2386
	kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu);
2387 2388
}

2389 2390
void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu)
{
2391 2392 2393 2394 2395
	int i, online_vcpus, started_vcpus = 0;

	if (!is_vcpu_stopped(vcpu))
		return;

2396
	trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1);
2397
	/* Only one cpu at a time may enter/leave the STOPPED state. */
2398
	spin_lock(&vcpu->kvm->arch.start_stop_lock);
2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417
	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);
	}

2418
	atomic_andnot(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
2419 2420 2421 2422
	/*
	 * Another VCPU might have used IBS while we were offline.
	 * Let's play safe and flush the VCPU at startup.
	 */
2423
	kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
2424
	spin_unlock(&vcpu->kvm->arch.start_stop_lock);
2425
	return;
2426 2427 2428 2429
}

void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu)
{
2430 2431 2432 2433 2434 2435
	int i, online_vcpus, started_vcpus = 0;
	struct kvm_vcpu *started_vcpu = NULL;

	if (is_vcpu_stopped(vcpu))
		return;

2436
	trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0);
2437
	/* Only one cpu at a time may enter/leave the STOPPED state. */
2438
	spin_lock(&vcpu->kvm->arch.start_stop_lock);
2439 2440
	online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);

2441
	/* SIGP STOP and SIGP STOP AND STORE STATUS has been fully processed */
2442
	kvm_s390_clear_stop_irq(vcpu);
2443

2444
	atomic_or(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461
	__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);
	}

2462
	spin_unlock(&vcpu->kvm->arch.start_stop_lock);
2463
	return;
2464 2465
}

2466 2467 2468 2469 2470 2471 2472 2473 2474
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) {
2475 2476 2477
	case KVM_CAP_S390_CSS_SUPPORT:
		if (!vcpu->kvm->arch.css_support) {
			vcpu->kvm->arch.css_support = 1;
2478
			VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support");
2479 2480 2481 2482
			trace_kvm_s390_enable_css(vcpu->kvm);
		}
		r = 0;
		break;
2483 2484 2485 2486 2487 2488 2489
	default:
		r = -EINVAL;
		break;
	}
	return r;
}

2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548
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) {
			r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size, false);
			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) {
			r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size, true);
			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;
}

2549 2550 2551 2552 2553
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;
2554
	int idx;
2555
	long r;
2556

2557
	switch (ioctl) {
2558 2559 2560 2561 2562 2563 2564 2565 2566
	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;
	}
2567
	case KVM_S390_INTERRUPT: {
2568
		struct kvm_s390_interrupt s390int;
2569
		struct kvm_s390_irq s390irq;
2570

2571
		r = -EFAULT;
2572
		if (copy_from_user(&s390int, argp, sizeof(s390int)))
2573
			break;
2574 2575 2576
		if (s390int_to_s390irq(&s390int, &s390irq))
			return -EINVAL;
		r = kvm_s390_inject_vcpu(vcpu, &s390irq);
2577
		break;
2578
	}
2579
	case KVM_S390_STORE_STATUS:
2580
		idx = srcu_read_lock(&vcpu->kvm->srcu);
2581
		r = kvm_s390_vcpu_store_status(vcpu, arg);
2582
		srcu_read_unlock(&vcpu->kvm->srcu, idx);
2583
		break;
2584 2585 2586
	case KVM_S390_SET_INITIAL_PSW: {
		psw_t psw;

2587
		r = -EFAULT;
2588
		if (copy_from_user(&psw, argp, sizeof(psw)))
2589 2590 2591
			break;
		r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
		break;
2592 2593
	}
	case KVM_S390_INITIAL_RESET:
2594 2595
		r = kvm_arch_vcpu_ioctl_initial_reset(vcpu);
		break;
2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607
	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;
	}
2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643
#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
2644
	case KVM_S390_VCPU_FAULT: {
2645
		r = gmap_fault(vcpu->arch.gmap, arg, 0);
2646 2647
		break;
	}
2648 2649 2650 2651 2652 2653 2654 2655 2656
	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;
	}
2657 2658 2659 2660 2661 2662 2663 2664 2665
	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;
	}
2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697
	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;
	}
2698
	default:
2699
		r = -ENOTTY;
2700
	}
2701
	return r;
2702 2703
}

2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716
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;
}

2717 2718
int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
			    unsigned long npages)
2719 2720 2721 2722
{
	return 0;
}

2723
/* Section: memory related */
2724 2725
int kvm_arch_prepare_memory_region(struct kvm *kvm,
				   struct kvm_memory_slot *memslot,
2726
				   const struct kvm_userspace_memory_region *mem,
2727
				   enum kvm_mr_change change)
2728
{
2729 2730 2731 2732
	/* 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 */
2733

2734
	if (mem->userspace_addr & 0xffffful)
2735 2736
		return -EINVAL;

2737
	if (mem->memory_size & 0xffffful)
2738 2739
		return -EINVAL;

2740 2741 2742 2743
	return 0;
}

void kvm_arch_commit_memory_region(struct kvm *kvm,
2744
				const struct kvm_userspace_memory_region *mem,
2745
				const struct kvm_memory_slot *old,
2746
				const struct kvm_memory_slot *new,
2747
				enum kvm_mr_change change)
2748
{
2749
	int rc;
2750

2751 2752 2753 2754 2755 2756 2757 2758 2759 2760
	/* 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;
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	rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr,
		mem->guest_phys_addr, mem->memory_size);
	if (rc)
2765
		pr_warn("failed to commit memory region\n");
2766
	return;
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}

static int __init kvm_s390_init(void)
{
2771
	return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
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}

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

module_init(kvm_s390_init);
module_exit(kvm_s390_exit);
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/*
 * 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");