arch/powerpc/kvm/powerpc.c - maze/linux - Git at Google

 /*
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License, version 2, as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  *
  * Copyright IBM Corp. 2007
  *
  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
  *          Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
  */

 #include <linux/errno.h>
 #include <linux/err.h>
 #include <linux/kvm_host.h>
 #include <linux/module.h>
 #include <linux/vmalloc.h>
 #include <linux/hrtimer.h>
 #include <linux/fs.h>
 #include <linux/slab.h>
 #include <asm/cputable.h>
 #include <asm/uaccess.h>
 #include <asm/kvm_ppc.h>
 #include <asm/tlbflush.h>
 #include "timing.h"
 #include "../mm/mmu_decl.h"

 #define CREATE_TRACE_POINTS
 #include "trace.h"

 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
 {
 	return !(v->arch.msr & MSR_WE) || !!(v->arch.pending_exceptions);
 }


 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
 {
 	enum emulation_result er;
 	int r;

 	er = kvmppc_emulate_instruction(run, vcpu);
 	switch (er) {
 	case EMULATE_DONE:
 		/* Future optimization: only reload non-volatiles if they were
 		 * actually modified. */
 		r = RESUME_GUEST_NV;
 		break;
 	case EMULATE_DO_MMIO:
 		run->exit_reason = KVM_EXIT_MMIO;
 		/* We must reload nonvolatiles because "update" load/store
 		 * instructions modify register state. */
 		/* Future optimization: only reload non-volatiles if they were
 		 * actually modified. */
 		r = RESUME_HOST_NV;
 		break;
 	case EMULATE_FAIL:
 		/* XXX Deliver Program interrupt to guest. */
 		printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
 		       kvmppc_get_last_inst(vcpu));
 		r = RESUME_HOST;
 		break;
 	default:
 		BUG();
 	}

 	return r;
 }

 int kvm_arch_hardware_enable(void *garbage)
 {
 	return 0;
 }

 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 *)rtn = kvmppc_core_check_processor_compat();
 }

 struct kvm *kvm_arch_create_vm(void)
 {
 	struct kvm *kvm;

 	kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 	if (!kvm)
 		return ERR_PTR(-ENOMEM);

 	return kvm;
 }

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

 	kvm_for_each_vcpu(i, vcpu, kvm)
 		kvm_arch_vcpu_free(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);
 }

 void kvm_arch_sync_events(struct kvm *kvm)
 {
 }

 void kvm_arch_destroy_vm(struct kvm *kvm)
 {
 	kvmppc_free_vcpus(kvm);
 	kvm_free_physmem(kvm);
 	cleanup_srcu_struct(&kvm->srcu);
 	kfree(kvm);
 }

 int kvm_dev_ioctl_check_extension(long ext)
 {
 	int r;

 	switch (ext) {
 	case KVM_CAP_PPC_SEGSTATE:
 	case KVM_CAP_PPC_PAIRED_SINGLES:
 	case KVM_CAP_PPC_UNSET_IRQ:
 	case KVM_CAP_ENABLE_CAP:
 	case KVM_CAP_PPC_OSI:
 		r = 1;
 		break;
 	case KVM_CAP_COALESCED_MMIO:
 		r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 		break;
 	default:
 		r = 0;
 		break;
 	}
 	return r;

 }

 long kvm_arch_dev_ioctl(struct file *filp,
                         unsigned int ioctl, unsigned long arg)
 {
 	return -EINVAL;
 }

 int kvm_arch_prepare_memory_region(struct kvm *kvm,
                                    struct kvm_memory_slot *memslot,
                                    struct kvm_memory_slot old,
                                    struct kvm_userspace_memory_region *mem,
                                    int user_alloc)
 {
 	return 0;
 }

 void kvm_arch_commit_memory_region(struct kvm *kvm,
                struct kvm_userspace_memory_region *mem,
                struct kvm_memory_slot old,
                int user_alloc)
 {
        return;
 }


 void kvm_arch_flush_shadow(struct kvm *kvm)
 {
 }

 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 {
 	struct kvm_vcpu *vcpu;
 	vcpu = kvmppc_core_vcpu_create(kvm, id);
 	if (!IS_ERR(vcpu))
 		kvmppc_create_vcpu_debugfs(vcpu, id);
 	return vcpu;
 }

 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 {
 	/* Make sure we're not using the vcpu anymore */
 	hrtimer_cancel(&vcpu->arch.dec_timer);
 	tasklet_kill(&vcpu->arch.tasklet);

 	kvmppc_remove_vcpu_debugfs(vcpu);
 	kvmppc_core_vcpu_free(vcpu);
 }

 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 {
 	kvm_arch_vcpu_free(vcpu);
 }

 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 {
 	return kvmppc_core_pending_dec(vcpu);
 }

 static void kvmppc_decrementer_func(unsigned long data)
 {
 	struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;

 	kvmppc_core_queue_dec(vcpu);

 	if (waitqueue_active(&vcpu->wq)) {
 		wake_up_interruptible(&vcpu->wq);
 		vcpu->stat.halt_wakeup++;
 	}
 }

 /*
  * low level hrtimer wake routine. Because this runs in hardirq context
  * we schedule a tasklet to do the real work.
  */
 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 {
 	struct kvm_vcpu *vcpu;

 	vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
 	tasklet_schedule(&vcpu->arch.tasklet);

 	return HRTIMER_NORESTART;
 }

 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 {
 	hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 	tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
 	vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;

 	return 0;
 }

 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 {
 	kvmppc_mmu_destroy(vcpu);
 }

 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 {
 	kvmppc_core_vcpu_load(vcpu, cpu);
 }

 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 {
 	kvmppc_core_vcpu_put(vcpu);
 }

 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
                                         struct kvm_guest_debug *dbg)
 {
 	return -EINVAL;
 }

 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
                                      struct kvm_run *run)
 {
 	kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
 }

 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
                                       struct kvm_run *run)
 {
 	u64 uninitialized_var(gpr);

 	if (run->mmio.len > sizeof(gpr)) {
 		printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 		return;
 	}

 	if (vcpu->arch.mmio_is_bigendian) {
 		switch (run->mmio.len) {
 		case 8: gpr = *(u64 *)run->mmio.data; break;
 		case 4: gpr = *(u32 *)run->mmio.data; break;
 		case 2: gpr = *(u16 *)run->mmio.data; break;
 		case 1: gpr = *(u8 *)run->mmio.data; break;
 		}
 	} else {
 		/* Convert BE data from userland back to LE. */
 		switch (run->mmio.len) {
 		case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
 		case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
 		case 1: gpr = *(u8 *)run->mmio.data; break;
 		}
 	}

 	if (vcpu->arch.mmio_sign_extend) {
 		switch (run->mmio.len) {
 #ifdef CONFIG_PPC64
 		case 4:
 			gpr = (s64)(s32)gpr;
 			break;
 #endif
 		case 2:
 			gpr = (s64)(s16)gpr;
 			break;
 		case 1:
 			gpr = (s64)(s8)gpr;
 			break;
 		}
 	}

 	kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);

 	switch (vcpu->arch.io_gpr & KVM_REG_EXT_MASK) {
 	case KVM_REG_GPR:
 		kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 		break;
 	case KVM_REG_FPR:
 		vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 		break;
 #ifdef CONFIG_PPC_BOOK3S
 	case KVM_REG_QPR:
 		vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 		break;
 	case KVM_REG_FQPR:
 		vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 		vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
 		break;
 #endif
 	default:
 		BUG();
 	}
 }

 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
                        unsigned int rt, unsigned int bytes, int is_bigendian)
 {
 	if (bytes > sizeof(run->mmio.data)) {
 		printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 		       run->mmio.len);
 	}

 	run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 	run->mmio.len = bytes;
 	run->mmio.is_write = 0;

 	vcpu->arch.io_gpr = rt;
 	vcpu->arch.mmio_is_bigendian = is_bigendian;
 	vcpu->mmio_needed = 1;
 	vcpu->mmio_is_write = 0;
 	vcpu->arch.mmio_sign_extend = 0;

 	return EMULATE_DO_MMIO;
 }

 /* Same as above, but sign extends */
 int kvmppc_handle_loads(struct kvm_run *run, struct kvm_vcpu *vcpu,
                         unsigned int rt, unsigned int bytes, int is_bigendian)
 {
 	int r;

 	r = kvmppc_handle_load(run, vcpu, rt, bytes, is_bigendian);
 	vcpu->arch.mmio_sign_extend = 1;

 	return r;
 }

 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
                         u64 val, unsigned int bytes, int is_bigendian)
 {
 	void *data = run->mmio.data;

 	if (bytes > sizeof(run->mmio.data)) {
 		printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 		       run->mmio.len);
 	}

 	run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 	run->mmio.len = bytes;
 	run->mmio.is_write = 1;
 	vcpu->mmio_needed = 1;
 	vcpu->mmio_is_write = 1;

 	/* Store the value at the lowest bytes in 'data'. */
 	if (is_bigendian) {
 		switch (bytes) {
 		case 8: *(u64 *)data = val; break;
 		case 4: *(u32 *)data = val; break;
 		case 2: *(u16 *)data = val; break;
 		case 1: *(u8  *)data = val; break;
 		}
 	} else {
 		/* Store LE value into 'data'. */
 		switch (bytes) {
 		case 4: st_le32(data, val); break;
 		case 2: st_le16(data, val); break;
 		case 1: *(u8 *)data = val; break;
 		}
 	}

 	return EMULATE_DO_MMIO;
 }

 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 {
 	int r;
 	sigset_t sigsaved;

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

 	if (vcpu->mmio_needed) {
 		if (!vcpu->mmio_is_write)
 			kvmppc_complete_mmio_load(vcpu, run);
 		vcpu->mmio_needed = 0;
 	} else if (vcpu->arch.dcr_needed) {
 		if (!vcpu->arch.dcr_is_write)
 			kvmppc_complete_dcr_load(vcpu, run);
 		vcpu->arch.dcr_needed = 0;
 	} else if (vcpu->arch.osi_needed) {
 		u64 *gprs = run->osi.gprs;
 		int i;

 		for (i = 0; i < 32; i++)
 			kvmppc_set_gpr(vcpu, i, gprs[i]);
 		vcpu->arch.osi_needed = 0;
 	}

 	kvmppc_core_deliver_interrupts(vcpu);

 	local_irq_disable();
 	kvm_guest_enter();
 	r = __kvmppc_vcpu_run(run, vcpu);
 	kvm_guest_exit();
 	local_irq_enable();

 	if (vcpu->sigset_active)
 		sigprocmask(SIG_SETMASK, &sigsaved, NULL);

 	return r;
 }

 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 {
 	if (irq->irq == KVM_INTERRUPT_UNSET)
 		kvmppc_core_dequeue_external(vcpu, irq);
 	else
 		kvmppc_core_queue_external(vcpu, irq);

 	if (waitqueue_active(&vcpu->wq)) {
 		wake_up_interruptible(&vcpu->wq);
 		vcpu->stat.halt_wakeup++;
 	}

 	return 0;
 }

 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) {
 	case KVM_CAP_PPC_OSI:
 		r = 0;
 		vcpu->arch.osi_enabled = true;
 		break;
 	default:
 		r = -EINVAL;
 		break;
 	}

 	return r;
 }

 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
                                     struct kvm_mp_state *mp_state)
 {
 	return -EINVAL;
 }

 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
                                     struct kvm_mp_state *mp_state)
 {
 	return -EINVAL;
 }

 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;
 	long r;

 	switch (ioctl) {
 	case KVM_INTERRUPT: {
 		struct kvm_interrupt irq;
 		r = -EFAULT;
 		if (copy_from_user(&irq, argp, sizeof(irq)))
 			goto out;
 		r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 		goto out;
 	}

 	case KVM_ENABLE_CAP:
 	{
 		struct kvm_enable_cap cap;
 		r = -EFAULT;
 		if (copy_from_user(&cap, argp, sizeof(cap)))
 			goto out;
 		r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
 		break;
 	}
 	default:
 		r = -EINVAL;
 	}

 out:
 	return r;
 }

 long kvm_arch_vm_ioctl(struct file *filp,
                        unsigned int ioctl, unsigned long arg)
 {
 	long r;

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

 	return r;
 }

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

 void kvm_arch_exit(void)
 {
 }
	/*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License, version 2, as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	*
	* Copyright IBM Corp. 2007
	*
	* Authors: Hollis Blanchard <hollisb@us.ibm.com>
	* Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
	*/

	#include <linux/errno.h>
	#include <linux/err.h>
	#include <linux/kvm_host.h>
	#include <linux/module.h>
	#include <linux/vmalloc.h>
	#include <linux/hrtimer.h>
	#include <linux/fs.h>
	#include <linux/slab.h>
	#include <asm/cputable.h>
	#include <asm/uaccess.h>
	#include <asm/kvm_ppc.h>
	#include <asm/tlbflush.h>
	#include "timing.h"
	#include "../mm/mmu_decl.h"

	#define CREATE_TRACE_POINTS
	#include "trace.h"

	int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
	{
	return !(v->arch.msr & MSR_WE) \|\| !!(v->arch.pending_exceptions);
	}


	int kvmppc_emulate_mmio(struct kvm_run run, struct kvm_vcpu vcpu)
	{
	enum emulation_result er;
	int r;

	er = kvmppc_emulate_instruction(run, vcpu);
	switch (er) {
	case EMULATE_DONE:
	/* Future optimization: only reload non-volatiles if they were
	* actually modified. */
	r = RESUME_GUEST_NV;
	break;
	case EMULATE_DO_MMIO:
	run->exit_reason = KVM_EXIT_MMIO;
	/* We must reload nonvolatiles because "update" load/store
	* instructions modify register state. */
	/* Future optimization: only reload non-volatiles if they were
	* actually modified. */
	r = RESUME_HOST_NV;
	break;
	case EMULATE_FAIL:
	/* XXX Deliver Program interrupt to guest. */
	printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
	kvmppc_get_last_inst(vcpu));
	r = RESUME_HOST;
	break;
	default:
	BUG();
	}

	return r;
	}

	int kvm_arch_hardware_enable(void *garbage)
	{
	return 0;
	}

	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 )rtn = kvmppc_core_check_processor_compat();
	}

	struct kvm *kvm_arch_create_vm(void)
	{
	struct kvm *kvm;

	kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
	if (!kvm)
	return ERR_PTR(-ENOMEM);

	return kvm;
	}

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

	kvm_for_each_vcpu(i, vcpu, kvm)
	kvm_arch_vcpu_free(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);
	}

	void kvm_arch_sync_events(struct kvm *kvm)
	{
	}

	void kvm_arch_destroy_vm(struct kvm *kvm)
	{
	kvmppc_free_vcpus(kvm);
	kvm_free_physmem(kvm);
	cleanup_srcu_struct(&kvm->srcu);
	kfree(kvm);
	}

	int kvm_dev_ioctl_check_extension(long ext)
	{
	int r;

	switch (ext) {
	case KVM_CAP_PPC_SEGSTATE:
	case KVM_CAP_PPC_PAIRED_SINGLES:
	case KVM_CAP_PPC_UNSET_IRQ:
	case KVM_CAP_ENABLE_CAP:
	case KVM_CAP_PPC_OSI:
	r = 1;
	break;
	case KVM_CAP_COALESCED_MMIO:
	r = KVM_COALESCED_MMIO_PAGE_OFFSET;
	break;
	default:
	r = 0;
	break;
	}
	return r;

	}

	long kvm_arch_dev_ioctl(struct file *filp,
	unsigned int ioctl, unsigned long arg)
	{
	return -EINVAL;
	}

	int kvm_arch_prepare_memory_region(struct kvm *kvm,
	struct kvm_memory_slot *memslot,
	struct kvm_memory_slot old,
	struct kvm_userspace_memory_region *mem,
	int user_alloc)
	{
	return 0;
	}

	void kvm_arch_commit_memory_region(struct kvm *kvm,
	struct kvm_userspace_memory_region *mem,
	struct kvm_memory_slot old,
	int user_alloc)
	{
	return;
	}


	void kvm_arch_flush_shadow(struct kvm *kvm)
	{
	}

	struct kvm_vcpu kvm_arch_vcpu_create(struct kvm kvm, unsigned int id)
	{
	struct kvm_vcpu *vcpu;
	vcpu = kvmppc_core_vcpu_create(kvm, id);
	if (!IS_ERR(vcpu))
	kvmppc_create_vcpu_debugfs(vcpu, id);
	return vcpu;
	}

	void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
	{
	/* Make sure we're not using the vcpu anymore */
	hrtimer_cancel(&vcpu->arch.dec_timer);
	tasklet_kill(&vcpu->arch.tasklet);

	kvmppc_remove_vcpu_debugfs(vcpu);
	kvmppc_core_vcpu_free(vcpu);
	}

	void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
	{
	kvm_arch_vcpu_free(vcpu);
	}

	int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
	{
	return kvmppc_core_pending_dec(vcpu);
	}

	static void kvmppc_decrementer_func(unsigned long data)
	{
	struct kvm_vcpu vcpu = (struct kvm_vcpu )data;

	kvmppc_core_queue_dec(vcpu);

	if (waitqueue_active(&vcpu->wq)) {
	wake_up_interruptible(&vcpu->wq);
	vcpu->stat.halt_wakeup++;
	}
	}

	/*
	* low level hrtimer wake routine. Because this runs in hardirq context
	* we schedule a tasklet to do the real work.
	*/
	enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
	{
	struct kvm_vcpu *vcpu;

	vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
	tasklet_schedule(&vcpu->arch.tasklet);

	return HRTIMER_NORESTART;
	}

	int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
	{
	hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
	tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
	vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;

	return 0;
	}

	void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
	{
	kvmppc_mmu_destroy(vcpu);
	}

	void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
	{
	kvmppc_core_vcpu_load(vcpu, cpu);
	}

	void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
	{
	kvmppc_core_vcpu_put(vcpu);
	}

	int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
	struct kvm_guest_debug *dbg)
	{
	return -EINVAL;
	}

	static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
	struct kvm_run *run)
	{
	kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
	}

	static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
	struct kvm_run *run)
	{
	u64 uninitialized_var(gpr);

	if (run->mmio.len > sizeof(gpr)) {
	printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
	return;
	}

	if (vcpu->arch.mmio_is_bigendian) {
	switch (run->mmio.len) {
	case 8: gpr = (u64 )run->mmio.data; break;
	case 4: gpr = (u32 )run->mmio.data; break;
	case 2: gpr = (u16 )run->mmio.data; break;
	case 1: gpr = (u8 )run->mmio.data; break;
	}
	} else {
	/* Convert BE data from userland back to LE. */
	switch (run->mmio.len) {
	case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
	case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
	case 1: gpr = (u8 )run->mmio.data; break;
	}
	}

	if (vcpu->arch.mmio_sign_extend) {
	switch (run->mmio.len) {
	#ifdef CONFIG_PPC64
	case 4:
	gpr = (s64)(s32)gpr;
	break;
	#endif
	case 2:
	gpr = (s64)(s16)gpr;
	break;
	case 1:
	gpr = (s64)(s8)gpr;
	break;
	}
	}

	kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);

	switch (vcpu->arch.io_gpr & KVM_REG_EXT_MASK) {
	case KVM_REG_GPR:
	kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
	break;
	case KVM_REG_FPR:
	vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
	break;
	#ifdef CONFIG_PPC_BOOK3S
	case KVM_REG_QPR:
	vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
	break;
	case KVM_REG_FQPR:
	vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
	vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
	break;
	#endif
	default:
	BUG();
	}
	}

	int kvmppc_handle_load(struct kvm_run run, struct kvm_vcpu vcpu,
	unsigned int rt, unsigned int bytes, int is_bigendian)
	{
	if (bytes > sizeof(run->mmio.data)) {
	printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
	run->mmio.len);
	}

	run->mmio.phys_addr = vcpu->arch.paddr_accessed;
	run->mmio.len = bytes;
	run->mmio.is_write = 0;

	vcpu->arch.io_gpr = rt;
	vcpu->arch.mmio_is_bigendian = is_bigendian;
	vcpu->mmio_needed = 1;
	vcpu->mmio_is_write = 0;
	vcpu->arch.mmio_sign_extend = 0;

	return EMULATE_DO_MMIO;
	}

	/* Same as above, but sign extends */
	int kvmppc_handle_loads(struct kvm_run run, struct kvm_vcpu vcpu,
	unsigned int rt, unsigned int bytes, int is_bigendian)
	{
	int r;

	r = kvmppc_handle_load(run, vcpu, rt, bytes, is_bigendian);
	vcpu->arch.mmio_sign_extend = 1;

	return r;
	}

	int kvmppc_handle_store(struct kvm_run run, struct kvm_vcpu vcpu,
	u64 val, unsigned int bytes, int is_bigendian)
	{
	void *data = run->mmio.data;

	if (bytes > sizeof(run->mmio.data)) {
	printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
	run->mmio.len);
	}

	run->mmio.phys_addr = vcpu->arch.paddr_accessed;
	run->mmio.len = bytes;
	run->mmio.is_write = 1;
	vcpu->mmio_needed = 1;
	vcpu->mmio_is_write = 1;

	/* Store the value at the lowest bytes in 'data'. */
	if (is_bigendian) {
	switch (bytes) {
	case 8: (u64 )data = val; break;
	case 4: (u32 )data = val; break;
	case 2: (u16 )data = val; break;
	case 1: (u8 )data = val; break;
	}
	} else {
	/* Store LE value into 'data'. */
	switch (bytes) {
	case 4: st_le32(data, val); break;
	case 2: st_le16(data, val); break;
	case 1: (u8 )data = val; break;
	}
	}

	return EMULATE_DO_MMIO;
	}

	int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu vcpu, struct kvm_run run)
	{
	int r;
	sigset_t sigsaved;

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

	if (vcpu->mmio_needed) {
	if (!vcpu->mmio_is_write)
	kvmppc_complete_mmio_load(vcpu, run);
	vcpu->mmio_needed = 0;
	} else if (vcpu->arch.dcr_needed) {
	if (!vcpu->arch.dcr_is_write)
	kvmppc_complete_dcr_load(vcpu, run);
	vcpu->arch.dcr_needed = 0;
	} else if (vcpu->arch.osi_needed) {
	u64 *gprs = run->osi.gprs;
	int i;

	for (i = 0; i < 32; i++)
	kvmppc_set_gpr(vcpu, i, gprs[i]);
	vcpu->arch.osi_needed = 0;
	}

	kvmppc_core_deliver_interrupts(vcpu);

	local_irq_disable();
	kvm_guest_enter();
	r = __kvmppc_vcpu_run(run, vcpu);
	kvm_guest_exit();
	local_irq_enable();

	if (vcpu->sigset_active)
	sigprocmask(SIG_SETMASK, &sigsaved, NULL);

	return r;
	}

	int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu vcpu, struct kvm_interrupt irq)
	{
	if (irq->irq == KVM_INTERRUPT_UNSET)
	kvmppc_core_dequeue_external(vcpu, irq);
	else
	kvmppc_core_queue_external(vcpu, irq);

	if (waitqueue_active(&vcpu->wq)) {
	wake_up_interruptible(&vcpu->wq);
	vcpu->stat.halt_wakeup++;
	}

	return 0;
	}

	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) {
	case KVM_CAP_PPC_OSI:
	r = 0;
	vcpu->arch.osi_enabled = true;
	break;
	default:
	r = -EINVAL;
	break;
	}

	return r;
	}

	int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
	struct kvm_mp_state *mp_state)
	{
	return -EINVAL;
	}

	int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
	struct kvm_mp_state *mp_state)
	{
	return -EINVAL;
	}

	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;
	long r;

	switch (ioctl) {
	case KVM_INTERRUPT: {
	struct kvm_interrupt irq;
	r = -EFAULT;
	if (copy_from_user(&irq, argp, sizeof(irq)))
	goto out;
	r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
	goto out;
	}

	case KVM_ENABLE_CAP:
	{
	struct kvm_enable_cap cap;
	r = -EFAULT;
	if (copy_from_user(&cap, argp, sizeof(cap)))
	goto out;
	r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
	break;
	}
	default:
	r = -EINVAL;
	}

	out:
	return r;
	}

	long kvm_arch_vm_ioctl(struct file *filp,
	unsigned int ioctl, unsigned long arg)
	{
	long r;

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

	return r;
	}

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

	void kvm_arch_exit(void)
	{
	}