kvm-s390.c 26.8 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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 */

#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>
#include <linux/slab.h>
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#include <linux/timer.h>
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#include <asm/asm-offsets.h>
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#include <asm/lowcore.h>
#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/sclp.h>
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#include "kvm-s390.h"
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#include "gaccess.h"

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#define CREATE_TRACE_POINTS
#include "trace.h"
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#include "trace-s390.h"
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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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	{ "instruction_lctlg", VCPU_STAT(instruction_lctlg) },
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	{ "instruction_lctl", VCPU_STAT(instruction_lctl) },
	{ "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_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) },
	{ "instruction_stsch", VCPU_STAT(instruction_stsch) },
	{ "instruction_chsc", VCPU_STAT(instruction_chsc) },
	{ "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) },
	{ "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) },
	{ "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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	{ "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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	{ NULL }
};

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static unsigned long long *facilities;
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/* Section: not file related */
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int kvm_arch_hardware_enable(void *garbage)
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{
	/* every s390 is virtualization enabled ;-) */
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	return 0;
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}

void kvm_arch_hardware_disable(void *garbage)
{
}

int kvm_arch_hardware_setup(void)
{
	return 0;
}

void kvm_arch_hardware_unsetup(void)
{
}

void kvm_arch_check_processor_compat(void *rtn)
{
}

int kvm_arch_init(void *opaque)
{
	return 0;
}

void kvm_arch_exit(void)
{
}

/* 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;
}

int kvm_dev_ioctl_check_extension(long ext)
{
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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_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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	case KVM_CAP_IOEVENTFD:
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		r = 1;
		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_S390_COW:
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		r = MACHINE_HAS_ESOP;
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		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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}

/* Section: vm related */
/*
 * 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)
{
	return 0;
}

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;
	int r;

	switch (ioctl) {
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	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;
	}
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	default:
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		r = -ENOTTY;
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	}

	return r;
}

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int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
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{
	int rc;
	char debug_name[16];

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	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

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	rc = s390_enable_sie();
	if (rc)
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		goto out_err;
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	rc = -ENOMEM;

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	kvm->arch.sca = (struct sca_block *) get_zeroed_page(GFP_KERNEL);
	if (!kvm->arch.sca)
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		goto out_err;
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	sprintf(debug_name, "kvm-%u", current->pid);

	kvm->arch.dbf = debug_register(debug_name, 8, 2, 8 * sizeof(long));
	if (!kvm->arch.dbf)
		goto out_nodbf;

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	spin_lock_init(&kvm->arch.float_int.lock);
	INIT_LIST_HEAD(&kvm->arch.float_int.list);

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	debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
	VM_EVENT(kvm, 3, "%s", "vm created");

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	if (type & KVM_VM_S390_UCONTROL) {
		kvm->arch.gmap = NULL;
	} else {
		kvm->arch.gmap = gmap_alloc(current->mm);
		if (!kvm->arch.gmap)
			goto out_nogmap;
	}
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	kvm->arch.css_support = 0;

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	return 0;
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out_nogmap:
	debug_unregister(kvm->arch.dbf);
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out_nodbf:
	free_page((unsigned long)(kvm->arch.sca));
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out_err:
	return rc;
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}

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void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
	VCPU_EVENT(vcpu, 3, "%s", "free cpu");
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	trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
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	if (!kvm_is_ucontrol(vcpu->kvm)) {
		clear_bit(63 - vcpu->vcpu_id,
			  (unsigned long *) &vcpu->kvm->arch.sca->mcn);
		if (vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda ==
		    (__u64) vcpu->arch.sie_block)
			vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda = 0;
	}
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	smp_mb();
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	if (kvm_is_ucontrol(vcpu->kvm))
		gmap_free(vcpu->arch.gmap);

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	free_page((unsigned long)(vcpu->arch.sie_block));
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	kvm_vcpu_uninit(vcpu);
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	kfree(vcpu);
}

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

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void kvm_arch_sync_events(struct kvm *kvm)
{
}

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void kvm_arch_destroy_vm(struct kvm *kvm)
{
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	kvm_free_vcpus(kvm);
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	free_page((unsigned long)(kvm->arch.sca));
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	debug_unregister(kvm->arch.dbf);
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	if (!kvm_is_ucontrol(kvm))
		gmap_free(kvm->arch.gmap);
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}

/* Section: vcpu related */
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
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	if (kvm_is_ucontrol(vcpu->kvm)) {
		vcpu->arch.gmap = gmap_alloc(current->mm);
		if (!vcpu->arch.gmap)
			return -ENOMEM;
		return 0;
	}

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	vcpu->arch.gmap = vcpu->kvm->arch.gmap;
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	vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
				    KVM_SYNC_GPRS |
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				    KVM_SYNC_ACRS |
				    KVM_SYNC_CRS;
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	return 0;
}

void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
{
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	/* Nothing todo */
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}

void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
	save_fp_regs(&vcpu->arch.host_fpregs);
	save_access_regs(vcpu->arch.host_acrs);
	vcpu->arch.guest_fpregs.fpc &= FPC_VALID_MASK;
	restore_fp_regs(&vcpu->arch.guest_fpregs);
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	restore_access_regs(vcpu->run->s.regs.acrs);
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	gmap_enable(vcpu->arch.gmap);
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	atomic_set_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
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}

void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
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	atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
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	gmap_disable(vcpu->arch.gmap);
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	save_fp_regs(&vcpu->arch.guest_fpregs);
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	save_access_regs(vcpu->run->s.regs.acrs);
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	restore_fp_regs(&vcpu->arch.host_fpregs);
	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;
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	kvm_s390_set_prefix(vcpu, 0);
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	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;
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	atomic_set_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
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}

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

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int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
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	atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
						    CPUSTAT_SM |
						    CPUSTAT_STOPPED);
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	vcpu->arch.sie_block->ecb   = 6;
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	vcpu->arch.sie_block->eca   = 0xC1002001U;
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	vcpu->arch.sie_block->fac   = (int) (long) facilities;
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	hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
	tasklet_init(&vcpu->arch.tasklet, kvm_s390_tasklet,
		     (unsigned long) vcpu);
	vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
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	get_cpu_id(&vcpu->arch.cpu_id);
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	vcpu->arch.cpu_id.version = 0xff;
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	return 0;
}

struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
				      unsigned int id)
{
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	struct kvm_vcpu *vcpu;
	int rc = -EINVAL;

	if (id >= KVM_MAX_VCPUS)
		goto out;

	rc = -ENOMEM;
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	vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
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	if (!vcpu)
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		goto out;
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	vcpu->arch.sie_block = (struct kvm_s390_sie_block *)
					get_zeroed_page(GFP_KERNEL);
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	if (!vcpu->arch.sie_block)
		goto out_free_cpu;

	vcpu->arch.sie_block->icpua = id;
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	if (!kvm_is_ucontrol(kvm)) {
		if (!kvm->arch.sca) {
			WARN_ON_ONCE(1);
			goto out_free_cpu;
		}
		if (!kvm->arch.sca->cpu[id].sda)
			kvm->arch.sca->cpu[id].sda =
				(__u64) vcpu->arch.sie_block;
		vcpu->arch.sie_block->scaoh =
			(__u32)(((__u64)kvm->arch.sca) >> 32);
		vcpu->arch.sie_block->scaol = (__u32)(__u64)kvm->arch.sca;
		set_bit(63 - id, (unsigned long *) &kvm->arch.sca->mcn);
	}
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	spin_lock_init(&vcpu->arch.local_int.lock);
	INIT_LIST_HEAD(&vcpu->arch.local_int.list);
	vcpu->arch.local_int.float_int = &kvm->arch.float_int;
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	spin_lock(&kvm->arch.float_int.lock);
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	kvm->arch.float_int.local_int[id] = &vcpu->arch.local_int;
	init_waitqueue_head(&vcpu->arch.local_int.wq);
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	vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags;
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	spin_unlock(&kvm->arch.float_int.lock);
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	rc = kvm_vcpu_init(vcpu, kvm, id);
	if (rc)
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		goto out_free_sie_block;
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	VM_EVENT(kvm, 3, "create cpu %d at %p, sie block at %p", id, vcpu,
		 vcpu->arch.sie_block);
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	trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);
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	return vcpu;
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out_free_sie_block:
	free_page((unsigned long)(vcpu->arch.sie_block));
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out_free_cpu:
	kfree(vcpu);
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out:
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	return ERR_PTR(rc);
}

int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
	/* kvm common code refers to this, but never calls it */
	BUG();
	return 0;
}

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int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
{
	/* kvm common code refers to this, but never calls it */
	BUG();
	return 0;
}

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static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
					   struct kvm_one_reg *reg)
{
	int r = -EINVAL;

	switch (reg->id) {
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	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;
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	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;
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	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) {
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	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;
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	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;
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	default:
		break;
	}

	return r;
}
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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)
{
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	memcpy(&vcpu->run->s.regs.gprs, &regs->gprs, sizeof(regs->gprs));
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	return 0;
}

int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
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	memcpy(&regs->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
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	return 0;
}

int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs)
{
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	memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
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	memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
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	restore_access_regs(vcpu->run->s.regs.acrs);
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	return 0;
}

int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs)
{
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	memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
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	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)
{
	memcpy(&vcpu->arch.guest_fpregs.fprs, &fpu->fprs, sizeof(fpu->fprs));
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	vcpu->arch.guest_fpregs.fpc = fpu->fpc & FPC_VALID_MASK;
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	restore_fp_regs(&vcpu->arch.guest_fpregs);
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	return 0;
}

int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
	memcpy(&fpu->fprs, &vcpu->arch.guest_fpregs.fprs, sizeof(fpu->fprs));
	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;

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	if (!(atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_STOPPED))
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		rc = -EBUSY;
575 576 577 578
	else {
		vcpu->run->psw_mask = psw.mask;
		vcpu->run->psw_addr = psw.addr;
	}
579 580 581 582 583 584 585 586 587
	return rc;
}

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

J
Jan Kiszka 已提交
588 589
int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
					struct kvm_guest_debug *dbg)
590 591 592 593
{
	return -EINVAL; /* not implemented yet */
}

594 595 596 597 598 599 600 601 602 603 604 605
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
				    struct kvm_mp_state *mp_state)
{
	return -EINVAL; /* not implemented yet */
}

int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
				    struct kvm_mp_state *mp_state)
{
	return -EINVAL; /* not implemented yet */
}

606
static int __vcpu_run(struct kvm_vcpu *vcpu)
607
{
608 609
	int rc;

610
	memcpy(&vcpu->arch.sie_block->gg14, &vcpu->run->s.regs.gprs[14], 16);
611 612 613 614

	if (need_resched())
		schedule();

615 616 617
	if (test_thread_flag(TIF_MCCK_PENDING))
		s390_handle_mcck();

618 619
	if (!kvm_is_ucontrol(vcpu->kvm))
		kvm_s390_deliver_pending_interrupts(vcpu);
C
Carsten Otte 已提交
620

621
	vcpu->arch.sie_block->icptcode = 0;
622
	preempt_disable();
623
	kvm_guest_enter();
624
	preempt_enable();
625 626
	VCPU_EVENT(vcpu, 6, "entering sie flags %x",
		   atomic_read(&vcpu->arch.sie_block->cpuflags));
627 628
	trace_kvm_s390_sie_enter(vcpu,
				 atomic_read(&vcpu->arch.sie_block->cpuflags));
629
	rc = sie64a(vcpu->arch.sie_block, vcpu->run->s.regs.gprs);
630 631 632 633 634
	if (rc) {
		if (kvm_is_ucontrol(vcpu->kvm)) {
			rc = SIE_INTERCEPT_UCONTROL;
		} else {
			VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
635
			trace_kvm_s390_sie_fault(vcpu);
636
			rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
637
		}
638
	}
639 640
	VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
		   vcpu->arch.sie_block->icptcode);
641
	trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);
642 643
	kvm_guest_exit();

644
	memcpy(&vcpu->run->s.regs.gprs[14], &vcpu->arch.sie_block->gg14, 16);
645
	return rc;
646 647 648 649
}

int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
650
	int rc;
651 652
	sigset_t sigsaved;

653
rerun_vcpu:
654 655 656
	if (vcpu->sigset_active)
		sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);

657
	atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
658

659 660
	BUG_ON(vcpu->kvm->arch.float_int.local_int[vcpu->vcpu_id] == NULL);

661 662 663
	switch (kvm_run->exit_reason) {
	case KVM_EXIT_S390_SIEIC:
	case KVM_EXIT_UNKNOWN:
664
	case KVM_EXIT_INTR:
665
	case KVM_EXIT_S390_RESET:
666
	case KVM_EXIT_S390_UCONTROL:
667
	case KVM_EXIT_S390_TSCH:
668 669 670 671 672
		break;
	default:
		BUG();
	}

673 674
	vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
	vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
675 676 677 678
	if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX) {
		kvm_run->kvm_dirty_regs &= ~KVM_SYNC_PREFIX;
		kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
	}
679 680 681 682 683
	if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) {
		kvm_run->kvm_dirty_regs &= ~KVM_SYNC_CRS;
		memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128);
		kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
	}
684

685
	might_fault();
686 687

	do {
688 689 690
		rc = __vcpu_run(vcpu);
		if (rc)
			break;
691 692 693 694
		if (kvm_is_ucontrol(vcpu->kvm))
			rc = -EOPNOTSUPP;
		else
			rc = kvm_handle_sie_intercept(vcpu);
695 696
	} while (!signal_pending(current) && !rc);

697 698 699
	if (rc == SIE_INTERCEPT_RERUNVCPU)
		goto rerun_vcpu;

700 701
	if (signal_pending(current) && !rc) {
		kvm_run->exit_reason = KVM_EXIT_INTR;
702
		rc = -EINTR;
703
	}
704

705 706 707 708 709 710 711 712 713 714
#ifdef CONFIG_KVM_S390_UCONTROL
	if (rc == SIE_INTERCEPT_UCONTROL) {
		kvm_run->exit_reason = KVM_EXIT_S390_UCONTROL;
		kvm_run->s390_ucontrol.trans_exc_code =
			current->thread.gmap_addr;
		kvm_run->s390_ucontrol.pgm_code = 0x10;
		rc = 0;
	}
#endif

715
	if (rc == -EOPNOTSUPP) {
716 717 718 719 720 721 722 723 724 725 726 727 728
		/* intercept cannot be handled in-kernel, prepare kvm-run */
		kvm_run->exit_reason         = KVM_EXIT_S390_SIEIC;
		kvm_run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
		kvm_run->s390_sieic.ipa      = vcpu->arch.sie_block->ipa;
		kvm_run->s390_sieic.ipb      = vcpu->arch.sie_block->ipb;
		rc = 0;
	}

	if (rc == -EREMOTE) {
		/* intercept was handled, but userspace support is needed
		 * kvm_run has been prepared by the handler */
		rc = 0;
	}
729

730 731
	kvm_run->psw_mask     = vcpu->arch.sie_block->gpsw.mask;
	kvm_run->psw_addr     = vcpu->arch.sie_block->gpsw.addr;
732
	kvm_run->s.regs.prefix = vcpu->arch.sie_block->prefix;
733
	memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
734

735 736 737 738
	if (vcpu->sigset_active)
		sigprocmask(SIG_SETMASK, &sigsaved, NULL);

	vcpu->stat.exit_userspace++;
739
	return rc;
740 741
}

742
static int __guestcopy(struct kvm_vcpu *vcpu, u64 guestdest, void *from,
743 744 745 746 747 748 749 750 751 752 753 754 755 756
		       unsigned long n, int prefix)
{
	if (prefix)
		return copy_to_guest(vcpu, guestdest, from, n);
	else
		return copy_to_guest_absolute(vcpu, guestdest, from, n);
}

/*
 * 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
 */
757
int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
758
{
759
	unsigned char archmode = 1;
760 761 762 763 764 765 766 767 768 769 770 771 772 773 774
	int prefix;

	if (addr == KVM_S390_STORE_STATUS_NOADDR) {
		if (copy_to_guest_absolute(vcpu, 163ul, &archmode, 1))
			return -EFAULT;
		addr = SAVE_AREA_BASE;
		prefix = 0;
	} else if (addr == KVM_S390_STORE_STATUS_PREFIXED) {
		if (copy_to_guest(vcpu, 163ul, &archmode, 1))
			return -EFAULT;
		addr = SAVE_AREA_BASE;
		prefix = 1;
	} else
		prefix = 0;

775 776 777 778 779 780 781 782
	/*
	 * 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
	 */
	save_fp_regs(&vcpu->arch.guest_fpregs);
	save_access_regs(vcpu->run->s.regs.acrs);

783
	if (__guestcopy(vcpu, addr + offsetof(struct save_area, fp_regs),
784 785 786
			vcpu->arch.guest_fpregs.fprs, 128, prefix))
		return -EFAULT;

787
	if (__guestcopy(vcpu, addr + offsetof(struct save_area, gp_regs),
788
			vcpu->run->s.regs.gprs, 128, prefix))
789 790
		return -EFAULT;

791
	if (__guestcopy(vcpu, addr + offsetof(struct save_area, psw),
792 793 794
			&vcpu->arch.sie_block->gpsw, 16, prefix))
		return -EFAULT;

795
	if (__guestcopy(vcpu, addr + offsetof(struct save_area, pref_reg),
796 797 798 799
			&vcpu->arch.sie_block->prefix, 4, prefix))
		return -EFAULT;

	if (__guestcopy(vcpu,
800
			addr + offsetof(struct save_area, fp_ctrl_reg),
801 802 803
			&vcpu->arch.guest_fpregs.fpc, 4, prefix))
		return -EFAULT;

804
	if (__guestcopy(vcpu, addr + offsetof(struct save_area, tod_reg),
805 806 807
			&vcpu->arch.sie_block->todpr, 4, prefix))
		return -EFAULT;

808
	if (__guestcopy(vcpu, addr + offsetof(struct save_area, timer),
809 810 811
			&vcpu->arch.sie_block->cputm, 8, prefix))
		return -EFAULT;

812
	if (__guestcopy(vcpu, addr + offsetof(struct save_area, clk_cmp),
813 814 815
			&vcpu->arch.sie_block->ckc, 8, prefix))
		return -EFAULT;

816
	if (__guestcopy(vcpu, addr + offsetof(struct save_area, acc_regs),
817
			&vcpu->run->s.regs.acrs, 64, prefix))
818 819 820
		return -EFAULT;

	if (__guestcopy(vcpu,
821
			addr + offsetof(struct save_area, ctrl_regs),
822 823 824 825 826
			&vcpu->arch.sie_block->gcr, 128, prefix))
		return -EFAULT;
	return 0;
}

827 828 829 830 831 832 833 834 835
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) {
836 837 838 839 840 841 842
	case KVM_CAP_S390_CSS_SUPPORT:
		if (!vcpu->kvm->arch.css_support) {
			vcpu->kvm->arch.css_support = 1;
			trace_kvm_s390_enable_css(vcpu->kvm);
		}
		r = 0;
		break;
843 844 845 846 847 848 849
	default:
		r = -EINVAL;
		break;
	}
	return r;
}

850 851 852 853 854
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;
855
	long r;
856

857 858
	switch (ioctl) {
	case KVM_S390_INTERRUPT: {
859 860
		struct kvm_s390_interrupt s390int;

861
		r = -EFAULT;
862
		if (copy_from_user(&s390int, argp, sizeof(s390int)))
863 864 865
			break;
		r = kvm_s390_inject_vcpu(vcpu, &s390int);
		break;
866
	}
867
	case KVM_S390_STORE_STATUS:
868 869
		r = kvm_s390_vcpu_store_status(vcpu, arg);
		break;
870 871 872
	case KVM_S390_SET_INITIAL_PSW: {
		psw_t psw;

873
		r = -EFAULT;
874
		if (copy_from_user(&psw, argp, sizeof(psw)))
875 876 877
			break;
		r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
		break;
878 879
	}
	case KVM_S390_INITIAL_RESET:
880 881
		r = kvm_arch_vcpu_ioctl_initial_reset(vcpu);
		break;
882 883 884 885 886 887 888 889 890 891 892 893
	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;
	}
894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929
#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
930 931 932 933 934 935
	case KVM_S390_VCPU_FAULT: {
		r = gmap_fault(arg, vcpu->arch.gmap);
		if (!IS_ERR_VALUE(r))
			r = 0;
		break;
	}
936 937 938 939 940 941 942 943 944
	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;
	}
945
	default:
946
		r = -ENOTTY;
947
	}
948
	return r;
949 950
}

951 952 953 954 955 956 957 958 959 960 961 962 963
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;
}

964 965 966 967 968 969 970 971 972 973
void kvm_arch_free_memslot(struct kvm_memory_slot *free,
			   struct kvm_memory_slot *dont)
{
}

int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
{
	return 0;
}

974
/* Section: memory related */
975 976
int kvm_arch_prepare_memory_region(struct kvm *kvm,
				   struct kvm_memory_slot *memslot,
977 978
				   struct kvm_userspace_memory_region *mem,
				   enum kvm_mr_change change)
979 980 981 982 983 984 985 986
{
	/* A few sanity checks. We can have exactly one memory slot which has
	   to start at guest virtual zero and which has to be located at a
	   page boundary in userland and which has to end at a page boundary.
	   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 */

987
	if (mem->slot)
988 989 990 991 992
		return -EINVAL;

	if (mem->guest_phys_addr)
		return -EINVAL;

993
	if (mem->userspace_addr & 0xffffful)
994 995
		return -EINVAL;

996
	if (mem->memory_size & 0xffffful)
997 998
		return -EINVAL;

999 1000 1001 1002 1003
	return 0;
}

void kvm_arch_commit_memory_region(struct kvm *kvm,
				struct kvm_userspace_memory_region *mem,
1004 1005
				const struct kvm_memory_slot *old,
				enum kvm_mr_change change)
1006
{
1007
	int rc;
1008

1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
	/* 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;
1019 1020 1021 1022

	rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr,
		mem->guest_phys_addr, mem->memory_size);
	if (rc)
1023
		printk(KERN_WARNING "kvm-s390: failed to commit memory region\n");
1024
	return;
1025 1026
}

1027 1028 1029 1030 1031 1032
void kvm_arch_flush_shadow_all(struct kvm *kvm)
{
}

void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
				   struct kvm_memory_slot *slot)
1033 1034 1035
{
}

1036 1037
static int __init kvm_s390_init(void)
{
1038
	int ret;
1039
	ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1040 1041 1042 1043 1044
	if (ret)
		return ret;

	/*
	 * guests can ask for up to 255+1 double words, we need a full page
L
Lucas De Marchi 已提交
1045
	 * to hold the maximum amount of facilities. On the other hand, we
1046 1047
	 * only set facilities that are known to work in KVM.
	 */
1048
	facilities = (unsigned long long *) get_zeroed_page(GFP_KERNEL|GFP_DMA);
1049 1050 1051 1052
	if (!facilities) {
		kvm_exit();
		return -ENOMEM;
	}
1053
	memcpy(facilities, S390_lowcore.stfle_fac_list, 16);
1054
	facilities[0] &= 0xff00fff3f47c0000ULL;
1055
	facilities[1] &= 0x001c000000000000ULL;
1056
	return 0;
1057 1058 1059 1060
}

static void __exit kvm_s390_exit(void)
{
1061
	free_page((unsigned long) facilities);
1062 1063 1064 1065 1066
	kvm_exit();
}

module_init(kvm_s390_init);
module_exit(kvm_s390_exit);