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linux_dsm_epyc7002/arch/s390/kvm/kvm-s390.c
Carsten Otte ba5c1e9b6c KVM: s390: interrupt subsystem, cpu timer, waitpsw 
This patch contains the s390 interrupt subsystem (similar to in kernel apic)
including timer interrupts (similar to in-kernel-pit) and enabled wait
(similar to in kernel hlt).

In order to achieve that, this patch also introduces intercept handling
for instruction intercepts, and it implements load control instructions.

This patch introduces an ioctl KVM_S390_INTERRUPT which is valid for both
the vm file descriptors and the vcpu file descriptors. In case this ioctl is
issued against a vm file descriptor, the interrupt is considered floating.
Floating interrupts may be delivered to any virtual cpu in the configuration.

The following interrupts are supported:
SIGP STOP       - interprocessor signal that stops a remote cpu
SIGP SET PREFIX - interprocessor signal that sets the prefix register of a
                  (stopped) remote cpu
INT EMERGENCY   - interprocessor interrupt, usually used to signal need_reshed
                  and for smp_call_function() in the guest.
PROGRAM INT     - exception during program execution such as page fault, illegal
                  instruction and friends
RESTART         - interprocessor signal that starts a stopped cpu
INT VIRTIO      - floating interrupt for virtio signalisation
INT SERVICE     - floating interrupt for signalisations from the system
                  service processor

struct kvm_s390_interrupt, which is submitted as ioctl parameter when injecting
an interrupt, also carrys parameter data for interrupts along with the interrupt
type. Interrupts on s390 usually have a state that represents the current
operation, or identifies which device has caused the interruption on s390.

kvm_s390_handle_wait() does handle waitpsw in two flavors: in case of a
disabled wait (that is, disabled for interrupts), we exit to userspace. In case
of an enabled wait we set up a timer that equals the cpu clock comparator value
and sleep on a wait queue.

[christian: change virtio interrupt to 0x2603]

Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-04-27 12:00:44 +03:00

655 lines
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/*
* s390host.c -- hosting zSeries kernel virtual machines
*
* Copyright IBM Corp. 2008
*
* 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>
*/
#include <linux/compiler.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/timer.h>
#include <asm/lowcore.h>
#include <asm/pgtable.h>
#include "kvm-s390.h"
#include "gaccess.h"
#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) },
{ "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) },
{ "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) },
{ "instruction_lctg", VCPU_STAT(instruction_lctg) },
{ "instruction_lctl", VCPU_STAT(instruction_lctl) },
{ "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) },
{ "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) },
{ NULL }
};
/* Section: not file related */
void kvm_arch_hardware_enable(void *garbage)
{
/* every s390 is virtualization enabled ;-) */
}
void kvm_arch_hardware_disable(void *garbage)
{
}
void decache_vcpus_on_cpu(int cpu)
{
}
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)
{
return 0;
}
/* 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) {
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;
}
default:
r = -EINVAL;
}
return r;
}
struct kvm *kvm_arch_create_vm(void)
{
struct kvm *kvm;
int rc;
char debug_name[16];
rc = s390_enable_sie();
if (rc)
goto out_nokvm;
rc = -ENOMEM;
kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
if (!kvm)
goto out_nokvm;
kvm->arch.sca = (struct sca_block *) get_zeroed_page(GFP_KERNEL);
if (!kvm->arch.sca)
goto out_nosca;
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;
spin_lock_init(&kvm->arch.float_int.lock);
INIT_LIST_HEAD(&kvm->arch.float_int.list);
debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
VM_EVENT(kvm, 3, "%s", "vm created");
try_module_get(THIS_MODULE);
return kvm;
out_nodbf:
free_page((unsigned long)(kvm->arch.sca));
out_nosca:
kfree(kvm);
out_nokvm:
return ERR_PTR(rc);
}
void kvm_arch_destroy_vm(struct kvm *kvm)
{
debug_unregister(kvm->arch.dbf);
free_page((unsigned long)(kvm->arch.sca));
kfree(kvm);
module_put(THIS_MODULE);
}
/* Section: vcpu related */
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
return 0;
}
void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
{
/* kvm common code refers to this, but does'nt call it */
BUG();
}
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);
restore_access_regs(vcpu->arch.guest_acrs);
if (signal_pending(current))
atomic_set_mask(CPUSTAT_STOP_INT,
&vcpu->arch.sie_block->cpuflags);
}
void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
save_fp_regs(&vcpu->arch.guest_fpregs);
save_access_regs(vcpu->arch.guest_acrs);
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;
vcpu->arch.sie_block->prefix = 0UL;
vcpu->arch.sie_block->ihcpu = 0xffff;
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;
}
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH);
vcpu->arch.sie_block->gmslm = 0xffffffffffUL;
vcpu->arch.sie_block->gmsor = 0x000000000000;
vcpu->arch.sie_block->ecb = 2;
vcpu->arch.sie_block->eca = 0xC1002001U;
setup_timer(&vcpu->arch.ckc_timer, kvm_s390_idle_wakeup,
(unsigned long) vcpu);
return 0;
}
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
unsigned int id)
{
struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
int rc = -ENOMEM;
if (!vcpu)
goto out_nomem;
vcpu->arch.sie_block = (struct sie_block *) get_zeroed_page(GFP_KERNEL);
if (!vcpu->arch.sie_block)
goto out_free_cpu;
vcpu->arch.sie_block->icpua = id;
BUG_ON(!kvm->arch.sca);
BUG_ON(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;
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;
spin_lock_bh(&kvm->arch.float_int.lock);
kvm->arch.float_int.local_int[id] = &vcpu->arch.local_int;
init_waitqueue_head(&vcpu->arch.local_int.wq);
spin_unlock_bh(&kvm->arch.float_int.lock);
rc = kvm_vcpu_init(vcpu, kvm, id);
if (rc)
goto out_free_cpu;
VM_EVENT(kvm, 3, "create cpu %d at %p, sie block at %p", id, vcpu,
vcpu->arch.sie_block);
try_module_get(THIS_MODULE);
return vcpu;
out_free_cpu:
kfree(vcpu);
out_nomem:
return ERR_PTR(rc);
}
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
VCPU_EVENT(vcpu, 3, "%s", "destroy cpu");
free_page((unsigned long)(vcpu->arch.sie_block));
kfree(vcpu);
module_put(THIS_MODULE);
}
int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
/* kvm common code refers to this, but never calls it */
BUG();
return 0;
}
static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
{
vcpu_load(vcpu);
kvm_s390_vcpu_initial_reset(vcpu);
vcpu_put(vcpu);
return 0;
}
int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
vcpu_load(vcpu);
memcpy(&vcpu->arch.guest_gprs, &regs->gprs, sizeof(regs->gprs));
vcpu_put(vcpu);
return 0;
}
int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
vcpu_load(vcpu);
memcpy(&regs->gprs, &vcpu->arch.guest_gprs, sizeof(regs->gprs));
vcpu_put(vcpu);
return 0;
}
int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
vcpu_load(vcpu);
memcpy(&vcpu->arch.guest_acrs, &sregs->acrs, sizeof(sregs->acrs));
memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
vcpu_put(vcpu);
return 0;
}
int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
vcpu_load(vcpu);
memcpy(&sregs->acrs, &vcpu->arch.guest_acrs, sizeof(sregs->acrs));
memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));
vcpu_put(vcpu);
return 0;
}
int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
vcpu_load(vcpu);
memcpy(&vcpu->arch.guest_fpregs.fprs, &fpu->fprs, sizeof(fpu->fprs));
vcpu->arch.guest_fpregs.fpc = fpu->fpc;
vcpu_put(vcpu);
return 0;
}
int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
vcpu_load(vcpu);
memcpy(&fpu->fprs, &vcpu->arch.guest_fpregs.fprs, sizeof(fpu->fprs));
fpu->fpc = vcpu->arch.guest_fpregs.fpc;
vcpu_put(vcpu);
return 0;
}
static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
{
int rc = 0;
vcpu_load(vcpu);
if (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_RUNNING)
rc = -EBUSY;
else
vcpu->arch.sie_block->gpsw = psw;
vcpu_put(vcpu);
return rc;
}
int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
struct kvm_translation *tr)
{
return -EINVAL; /* not implemented yet */
}
int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
struct kvm_debug_guest *dbg)
{
return -EINVAL; /* not implemented yet */
}
static void __vcpu_run(struct kvm_vcpu *vcpu)
{
memcpy(&vcpu->arch.sie_block->gg14, &vcpu->arch.guest_gprs[14], 16);
if (need_resched())
schedule();
vcpu->arch.sie_block->icptcode = 0;
local_irq_disable();
kvm_guest_enter();
local_irq_enable();
VCPU_EVENT(vcpu, 6, "entering sie flags %x",
atomic_read(&vcpu->arch.sie_block->cpuflags));
sie64a(vcpu->arch.sie_block, vcpu->arch.guest_gprs);
VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
vcpu->arch.sie_block->icptcode);
local_irq_disable();
kvm_guest_exit();
local_irq_enable();
memcpy(&vcpu->arch.guest_gprs[14], &vcpu->arch.sie_block->gg14, 16);
}
int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
int rc;
sigset_t sigsaved;
vcpu_load(vcpu);
if (vcpu->sigset_active)
sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
atomic_set_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
BUG_ON(vcpu->kvm->arch.float_int.local_int[vcpu->vcpu_id] == NULL);
switch (kvm_run->exit_reason) {
case KVM_EXIT_S390_SIEIC:
vcpu->arch.sie_block->gpsw.mask = kvm_run->s390_sieic.mask;
vcpu->arch.sie_block->gpsw.addr = kvm_run->s390_sieic.addr;
break;
case KVM_EXIT_UNKNOWN:
case KVM_EXIT_S390_RESET:
break;
default:
BUG();
}
might_sleep();
do {
kvm_s390_deliver_pending_interrupts(vcpu);
__vcpu_run(vcpu);
rc = kvm_handle_sie_intercept(vcpu);
} while (!signal_pending(current) && !rc);
if (signal_pending(current) && !rc)
rc = -EINTR;
if (rc == -ENOTSUPP) {
/* 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.mask = vcpu->arch.sie_block->gpsw.mask;
kvm_run->s390_sieic.addr = vcpu->arch.sie_block->gpsw.addr;
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;
}
if (vcpu->sigset_active)
sigprocmask(SIG_SETMASK, &sigsaved, NULL);
vcpu_put(vcpu);
vcpu->stat.exit_userspace++;
return 0;
}
static int __guestcopy(struct kvm_vcpu *vcpu, u64 guestdest, const void *from,
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
*/
int __kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
{
const unsigned char archmode = 1;
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;
if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, fp_regs),
vcpu->arch.guest_fpregs.fprs, 128, prefix))
return -EFAULT;
if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, gp_regs),
vcpu->arch.guest_gprs, 128, prefix))
return -EFAULT;
if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, psw),
&vcpu->arch.sie_block->gpsw, 16, prefix))
return -EFAULT;
if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, pref_reg),
&vcpu->arch.sie_block->prefix, 4, prefix))
return -EFAULT;
if (__guestcopy(vcpu,
addr + offsetof(struct save_area_s390x, fp_ctrl_reg),
&vcpu->arch.guest_fpregs.fpc, 4, prefix))
return -EFAULT;
if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, tod_reg),
&vcpu->arch.sie_block->todpr, 4, prefix))
return -EFAULT;
if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, timer),
&vcpu->arch.sie_block->cputm, 8, prefix))
return -EFAULT;
if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, clk_cmp),
&vcpu->arch.sie_block->ckc, 8, prefix))
return -EFAULT;
if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, acc_regs),
&vcpu->arch.guest_acrs, 64, prefix))
return -EFAULT;
if (__guestcopy(vcpu,
addr + offsetof(struct save_area_s390x, ctrl_regs),
&vcpu->arch.sie_block->gcr, 128, prefix))
return -EFAULT;
return 0;
}
static int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
{
int rc;
vcpu_load(vcpu);
rc = __kvm_s390_vcpu_store_status(vcpu, addr);
vcpu_put(vcpu);
return rc;
}
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;
switch (ioctl) {
case KVM_S390_INTERRUPT: {
struct kvm_s390_interrupt s390int;
if (copy_from_user(&s390int, argp, sizeof(s390int)))
return -EFAULT;
return kvm_s390_inject_vcpu(vcpu, &s390int);
}
case KVM_S390_STORE_STATUS:
return kvm_s390_vcpu_store_status(vcpu, arg);
case KVM_S390_SET_INITIAL_PSW: {
psw_t psw;
if (copy_from_user(&psw, argp, sizeof(psw)))
return -EFAULT;
return kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
}
case KVM_S390_INITIAL_RESET:
return kvm_arch_vcpu_ioctl_initial_reset(vcpu);
default:
;
}
return -EINVAL;
}
/* Section: memory related */
int kvm_arch_set_memory_region(struct kvm *kvm,
struct kvm_userspace_memory_region *mem,
struct kvm_memory_slot old,
int user_alloc)
{
/* 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 */
if (mem->slot)
return -EINVAL;
if (mem->guest_phys_addr)
return -EINVAL;
if (mem->userspace_addr & (PAGE_SIZE - 1))
return -EINVAL;
if (mem->memory_size & (PAGE_SIZE - 1))
return -EINVAL;
kvm->arch.guest_origin = mem->userspace_addr;
kvm->arch.guest_memsize = mem->memory_size;
/* FIXME: we do want to interrupt running CPUs and update their memory
configuration now to avoid race conditions. But hey, changing the
memory layout while virtual CPUs are running is usually bad
programming practice. */
return 0;
}
gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
{
return gfn;
}
static int __init kvm_s390_init(void)
{
return kvm_init(NULL, sizeof(struct kvm_vcpu), THIS_MODULE);
}
static void __exit kvm_s390_exit(void)
{
kvm_exit();
}
module_init(kvm_s390_init);
module_exit(kvm_s390_exit);
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