[net-next-2.6.git] / arch / powerpc / kvm / powerpc.c

/*
 * 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.shared->msr & MSR_WE) ||
	       !!(v->arch.pending_exceptions);
}

int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
{
	int nr = kvmppc_get_gpr(vcpu, 11);
	int r;
	unsigned long __maybe_unused param1 = kvmppc_get_gpr(vcpu, 3);
	unsigned long __maybe_unused param2 = kvmppc_get_gpr(vcpu, 4);
	unsigned long __maybe_unused param3 = kvmppc_get_gpr(vcpu, 5);
	unsigned long __maybe_unused param4 = kvmppc_get_gpr(vcpu, 6);
	unsigned long r2 = 0;

	if (!(vcpu->arch.shared->msr & MSR_SF)) {
		/* 32 bit mode */
		param1 &= 0xffffffff;
		param2 &= 0xffffffff;
		param3 &= 0xffffffff;
		param4 &= 0xffffffff;
	}

	switch (nr) {
	case HC_VENDOR_KVM | KVM_HC_PPC_MAP_MAGIC_PAGE:
	{
		vcpu->arch.magic_page_pa = param1;
		vcpu->arch.magic_page_ea = param2;

		r2 = KVM_MAGIC_FEAT_SR;

		r = HC_EV_SUCCESS;
		break;
	}
	case HC_VENDOR_KVM | KVM_HC_FEATURES:
		r = HC_EV_SUCCESS;
#if defined(CONFIG_PPC_BOOK3S) /* XXX Missing magic page on BookE */
		r2 |= (1 << KVM_FEATURE_MAGIC_PAGE);
#endif

		/* Second return value is in r4 */
		break;
	default:
		r = HC_EV_UNIMPLEMENTED;
		break;
	}

	kvmppc_set_gpr(vcpu, 4, r2);

	return r;
}

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_PPC_IRQ_LEVEL:
	case KVM_CAP_ENABLE_CAP:
	case KVM_CAP_PPC_OSI:
	case KVM_CAP_PPC_GET_PVINFO:
		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;
}

static int kvm_vm_ioctl_get_pvinfo(struct kvm_ppc_pvinfo *pvinfo)
{
	u32 inst_lis = 0x3c000000;
	u32 inst_ori = 0x60000000;
	u32 inst_nop = 0x60000000;
	u32 inst_sc = 0x44000002;
	u32 inst_imm_mask = 0xffff;

	/*
	 * The hypercall to get into KVM from within guest context is as
	 * follows:
	 *
	 *    lis r0, r0, KVM_SC_MAGIC_R0@h
	 *    ori r0, KVM_SC_MAGIC_R0@l
	 *    sc
	 *    nop
	 */
	pvinfo->hcall[0] = inst_lis | ((KVM_SC_MAGIC_R0 >> 16) & inst_imm_mask);
	pvinfo->hcall[1] = inst_ori | (KVM_SC_MAGIC_R0 & inst_imm_mask);
	pvinfo->hcall[2] = inst_sc;
	pvinfo->hcall[3] = inst_nop;

	return 0;
}

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

	switch (ioctl) {
	case KVM_PPC_GET_PVINFO: {
		struct kvm_ppc_pvinfo pvinfo;
		memset(&pvinfo, 0, sizeof(pvinfo));
		r = kvm_vm_ioctl_get_pvinfo(&pvinfo);
		if (copy_to_user(argp, &pvinfo, sizeof(pvinfo))) {
			r = -EFAULT;
			goto out;
		}

		break;
	}
	default:
		r = -ENOTTY;
	}

out:
	return r;
}

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

void kvm_arch_exit(void)
{
}
Commit	Line	Data
bbf45ba5 HB	1	/*
	2	* This program is free software; you can redistribute it and/or modify
	3	* it under the terms of the GNU General Public License, version 2, as
	4	* published by the Free Software Foundation.
	5	*
	6	* This program is distributed in the hope that it will be useful,
	7	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	8	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	9	* GNU General Public License for more details.
	10	*
	11	* You should have received a copy of the GNU General Public License
	12	* along with this program; if not, write to the Free Software
	13	* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	14	*
	15	* Copyright IBM Corp. 2007
	16	*
	17	* Authors: Hollis Blanchard <hollisb@us.ibm.com>
	18	* Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
	19	*/
	20
	21	#include <linux/errno.h>
	22	#include <linux/err.h>
	23	#include <linux/kvm_host.h>
	24	#include <linux/module.h>
	25	#include <linux/vmalloc.h>
544c6761	26	#include <linux/hrtimer.h>
bbf45ba5	27	#include <linux/fs.h>
5a0e3ad6	28	#include <linux/slab.h>
bbf45ba5 HB	29	#include <asm/cputable.h>
	30	#include <asm/uaccess.h>
	31	#include <asm/kvm_ppc.h>
83aae4a8	32	#include <asm/tlbflush.h>
73e75b41	33	#include "timing.h"
fad7b9b5	34	#include "../mm/mmu_decl.h"
bbf45ba5	35
46f43c6e MT	36	#define CREATE_TRACE_POINTS
	37	#include "trace.h"
	38
bbf45ba5 HB	39	int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
bbf45ba5 HB	40	{
666e7252 AG	41	return !(v->arch.shared->msr & MSR_WE) \|\|
666e7252 AG	42	!!(v->arch.pending_exceptions);
bbf45ba5 HB	43	}
bbf45ba5 HB	44
2a342ed5 AG	45	int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
	46	{
	47	int nr = kvmppc_get_gpr(vcpu, 11);
	48	int r;
	49	unsigned long __maybe_unused param1 = kvmppc_get_gpr(vcpu, 3);
	50	unsigned long __maybe_unused param2 = kvmppc_get_gpr(vcpu, 4);
	51	unsigned long __maybe_unused param3 = kvmppc_get_gpr(vcpu, 5);
	52	unsigned long __maybe_unused param4 = kvmppc_get_gpr(vcpu, 6);
	53	unsigned long r2 = 0;
	54
	55	if (!(vcpu->arch.shared->msr & MSR_SF)) {
	56	/* 32 bit mode */
	57	param1 &= 0xffffffff;
	58	param2 &= 0xffffffff;
	59	param3 &= 0xffffffff;
	60	param4 &= 0xffffffff;
	61	}
	62
	63	switch (nr) {
5fc87407 AG	64	case HC_VENDOR_KVM \| KVM_HC_PPC_MAP_MAGIC_PAGE:
	65	{
	66	vcpu->arch.magic_page_pa = param1;
	67	vcpu->arch.magic_page_ea = param2;
	68
df1bfa25	69	r2 = KVM_MAGIC_FEAT_SR;
7508e16c	70
5fc87407 AG	71	r = HC_EV_SUCCESS;
	72	break;
	73	}
2a342ed5 AG	74	case HC_VENDOR_KVM \| KVM_HC_FEATURES:
2a342ed5 AG	75	r = HC_EV_SUCCESS;
5fc87407 AG	76	#if defined(CONFIG_PPC_BOOK3S) /* XXX Missing magic page on BookE */
	77	r2 \|= (1 << KVM_FEATURE_MAGIC_PAGE);
	78	#endif
2a342ed5 AG	79
2a342ed5 AG	80	/* Second return value is in r4 */
2a342ed5 AG	81	break;
	82	default:
	83	r = HC_EV_UNIMPLEMENTED;
	84	break;
	85	}
	86
7508e16c AG	87	kvmppc_set_gpr(vcpu, 4, r2);
7508e16c AG	88
2a342ed5 AG	89	return r;
2a342ed5 AG	90	}
bbf45ba5 HB	91
	92	int kvmppc_emulate_mmio(struct kvm_run run, struct kvm_vcpu vcpu)
	93	{
	94	enum emulation_result er;
	95	int r;
	96
	97	er = kvmppc_emulate_instruction(run, vcpu);
	98	switch (er) {
	99	case EMULATE_DONE:
	100	/* Future optimization: only reload non-volatiles if they were
	101	* actually modified. */
	102	r = RESUME_GUEST_NV;
	103	break;
	104	case EMULATE_DO_MMIO:
	105	run->exit_reason = KVM_EXIT_MMIO;
	106	/* We must reload nonvolatiles because "update" load/store
	107	* instructions modify register state. */
	108	/* Future optimization: only reload non-volatiles if they were
	109	* actually modified. */
	110	r = RESUME_HOST_NV;
	111	break;
	112	case EMULATE_FAIL:
	113	/* XXX Deliver Program interrupt to guest. */
	114	printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
c7f38f46	115	kvmppc_get_last_inst(vcpu));
bbf45ba5 HB	116	r = RESUME_HOST;
	117	break;
	118	default:
	119	BUG();
	120	}
	121
	122	return r;
	123	}
	124
10474ae8	125	int kvm_arch_hardware_enable(void *garbage)
bbf45ba5	126	{
10474ae8	127	return 0;
bbf45ba5 HB	128	}
	129
	130	void kvm_arch_hardware_disable(void *garbage)
	131	{
	132	}
	133
	134	int kvm_arch_hardware_setup(void)
	135	{
	136	return 0;
	137	}
	138
	139	void kvm_arch_hardware_unsetup(void)
	140	{
	141	}
	142
	143	void kvm_arch_check_processor_compat(void *rtn)
	144	{
9dd921cf	145	(int )rtn = kvmppc_core_check_processor_compat();
bbf45ba5 HB	146	}
	147
	148	struct kvm *kvm_arch_create_vm(void)
	149	{
	150	struct kvm *kvm;
	151
	152	kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
	153	if (!kvm)
	154	return ERR_PTR(-ENOMEM);
	155
	156	return kvm;
	157	}
	158
	159	static void kvmppc_free_vcpus(struct kvm *kvm)
	160	{
	161	unsigned int i;
988a2cae	162	struct kvm_vcpu *vcpu;
bbf45ba5	163
988a2cae GN	164	kvm_for_each_vcpu(i, vcpu, kvm)
	165	kvm_arch_vcpu_free(vcpu);
	166
	167	mutex_lock(&kvm->lock);
	168	for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
	169	kvm->vcpus[i] = NULL;
	170
	171	atomic_set(&kvm->online_vcpus, 0);
	172	mutex_unlock(&kvm->lock);
bbf45ba5 HB	173	}
bbf45ba5 HB	174
ad8ba2cd SY	175	void kvm_arch_sync_events(struct kvm *kvm)
	176	{
	177	}
	178
bbf45ba5 HB	179	void kvm_arch_destroy_vm(struct kvm *kvm)
	180	{
	181	kvmppc_free_vcpus(kvm);
	182	kvm_free_physmem(kvm);
64749204	183	cleanup_srcu_struct(&kvm->srcu);
bbf45ba5 HB	184	kfree(kvm);
	185	}
	186
	187	int kvm_dev_ioctl_check_extension(long ext)
	188	{
	189	int r;
	190
	191	switch (ext) {
e15a1137	192	case KVM_CAP_PPC_SEGSTATE:
c10207fe	193	case KVM_CAP_PPC_PAIRED_SINGLES:
18978768	194	case KVM_CAP_PPC_UNSET_IRQ:
7b4203e8	195	case KVM_CAP_PPC_IRQ_LEVEL:
71fbfd5f	196	case KVM_CAP_ENABLE_CAP:
ad0a048b	197	case KVM_CAP_PPC_OSI:
15711e9c	198	case KVM_CAP_PPC_GET_PVINFO:
e15a1137 AG	199	r = 1;
e15a1137 AG	200	break;
588968b6 LV	201	case KVM_CAP_COALESCED_MMIO:
	202	r = KVM_COALESCED_MMIO_PAGE_OFFSET;
	203	break;
bbf45ba5 HB	204	default:
	205	r = 0;
	206	break;
	207	}
	208	return r;
	209
	210	}
	211
	212	long kvm_arch_dev_ioctl(struct file *filp,
	213	unsigned int ioctl, unsigned long arg)
	214	{
	215	return -EINVAL;
	216	}
	217
f7784b8e MT	218	int kvm_arch_prepare_memory_region(struct kvm *kvm,
	219	struct kvm_memory_slot *memslot,
	220	struct kvm_memory_slot old,
	221	struct kvm_userspace_memory_region *mem,
	222	int user_alloc)
bbf45ba5 HB	223	{
	224	return 0;
	225	}
	226
f7784b8e MT	227	void kvm_arch_commit_memory_region(struct kvm *kvm,
	228	struct kvm_userspace_memory_region *mem,
	229	struct kvm_memory_slot old,
	230	int user_alloc)
	231	{
	232	return;
	233	}
	234
	235
34d4cb8f MT	236	void kvm_arch_flush_shadow(struct kvm *kvm)
	237	{
	238	}
	239
bbf45ba5 HB	240	struct kvm_vcpu kvm_arch_vcpu_create(struct kvm kvm, unsigned int id)
bbf45ba5 HB	241	{
73e75b41 HB	242	struct kvm_vcpu *vcpu;
73e75b41 HB	243	vcpu = kvmppc_core_vcpu_create(kvm, id);
06056bfb WY	244	if (!IS_ERR(vcpu))
06056bfb WY	245	kvmppc_create_vcpu_debugfs(vcpu, id);
73e75b41	246	return vcpu;
bbf45ba5 HB	247	}
	248
	249	void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
	250	{
a595405d AG	251	/* Make sure we're not using the vcpu anymore */
	252	hrtimer_cancel(&vcpu->arch.dec_timer);
	253	tasklet_kill(&vcpu->arch.tasklet);
	254
73e75b41	255	kvmppc_remove_vcpu_debugfs(vcpu);
db93f574	256	kvmppc_core_vcpu_free(vcpu);
bbf45ba5 HB	257	}
	258
	259	void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
	260	{
	261	kvm_arch_vcpu_free(vcpu);
	262	}
	263
	264	int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
	265	{
9dd921cf	266	return kvmppc_core_pending_dec(vcpu);
bbf45ba5 HB	267	}
	268
	269	static void kvmppc_decrementer_func(unsigned long data)
	270	{
	271	struct kvm_vcpu vcpu = (struct kvm_vcpu )data;
	272
9dd921cf	273	kvmppc_core_queue_dec(vcpu);
45c5eb67 HB	274
	275	if (waitqueue_active(&vcpu->wq)) {
	276	wake_up_interruptible(&vcpu->wq);
	277	vcpu->stat.halt_wakeup++;
	278	}
bbf45ba5 HB	279	}
bbf45ba5 HB	280
544c6761 AG	281	/*
	282	* low level hrtimer wake routine. Because this runs in hardirq context
	283	* we schedule a tasklet to do the real work.
	284	*/
	285	enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
	286	{
	287	struct kvm_vcpu *vcpu;
	288
	289	vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
	290	tasklet_schedule(&vcpu->arch.tasklet);
	291
	292	return HRTIMER_NORESTART;
	293	}
	294
bbf45ba5 HB	295	int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
bbf45ba5 HB	296	{
544c6761 AG	297	hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
	298	tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
	299	vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
bbf45ba5 HB	300
	301	return 0;
	302	}
	303
	304	void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
	305	{
ecc0981f	306	kvmppc_mmu_destroy(vcpu);
bbf45ba5 HB	307	}
	308
	309	void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
	310	{
9dd921cf	311	kvmppc_core_vcpu_load(vcpu, cpu);
bbf45ba5 HB	312	}
	313
	314	void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
	315	{
9dd921cf	316	kvmppc_core_vcpu_put(vcpu);
bbf45ba5 HB	317	}
bbf45ba5 HB	318
d0bfb940	319	int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
f5d0906b	320	struct kvm_guest_debug *dbg)
bbf45ba5	321	{
f5d0906b	322	return -EINVAL;
bbf45ba5 HB	323	}
	324
	325	static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
	326	struct kvm_run *run)
	327	{
8e5b26b5	328	kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
bbf45ba5 HB	329	}
	330
	331	static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
	332	struct kvm_run *run)
	333	{
69b61833	334	u64 uninitialized_var(gpr);
bbf45ba5	335
8e5b26b5	336	if (run->mmio.len > sizeof(gpr)) {
bbf45ba5 HB	337	printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
	338	return;
	339	}
	340
	341	if (vcpu->arch.mmio_is_bigendian) {
	342	switch (run->mmio.len) {
b104d066	343	case 8: gpr = (u64 )run->mmio.data; break;
8e5b26b5 AG	344	case 4: gpr = (u32 )run->mmio.data; break;
	345	case 2: gpr = (u16 )run->mmio.data; break;
	346	case 1: gpr = (u8 )run->mmio.data; break;
bbf45ba5 HB	347	}
	348	} else {
	349	/* Convert BE data from userland back to LE. */
	350	switch (run->mmio.len) {
8e5b26b5 AG	351	case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
	352	case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
	353	case 1: gpr = (u8 )run->mmio.data; break;
bbf45ba5 HB	354	}
bbf45ba5 HB	355	}
8e5b26b5	356
3587d534 AG	357	if (vcpu->arch.mmio_sign_extend) {
	358	switch (run->mmio.len) {
	359	#ifdef CONFIG_PPC64
	360	case 4:
	361	gpr = (s64)(s32)gpr;
	362	break;
	363	#endif
	364	case 2:
	365	gpr = (s64)(s16)gpr;
	366	break;
	367	case 1:
	368	gpr = (s64)(s8)gpr;
	369	break;
	370	}
	371	}
	372
8e5b26b5	373	kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
b104d066 AG	374
	375	switch (vcpu->arch.io_gpr & KVM_REG_EXT_MASK) {
	376	case KVM_REG_GPR:
	377	kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
	378	break;
	379	case KVM_REG_FPR:
	380	vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
	381	break;
287d5611	382	#ifdef CONFIG_PPC_BOOK3S
b104d066 AG	383	case KVM_REG_QPR:
	384	vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
	385	break;
	386	case KVM_REG_FQPR:
	387	vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
	388	vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
	389	break;
287d5611	390	#endif
b104d066 AG	391	default:
	392	BUG();
	393	}
bbf45ba5 HB	394	}
	395
	396	int kvmppc_handle_load(struct kvm_run run, struct kvm_vcpu vcpu,
	397	unsigned int rt, unsigned int bytes, int is_bigendian)
	398	{
	399	if (bytes > sizeof(run->mmio.data)) {
	400	printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
	401	run->mmio.len);
	402	}
	403
	404	run->mmio.phys_addr = vcpu->arch.paddr_accessed;
	405	run->mmio.len = bytes;
	406	run->mmio.is_write = 0;
	407
	408	vcpu->arch.io_gpr = rt;
	409	vcpu->arch.mmio_is_bigendian = is_bigendian;
	410	vcpu->mmio_needed = 1;
	411	vcpu->mmio_is_write = 0;
3587d534	412	vcpu->arch.mmio_sign_extend = 0;
bbf45ba5 HB	413
	414	return EMULATE_DO_MMIO;
	415	}
	416
3587d534 AG	417	/* Same as above, but sign extends */
	418	int kvmppc_handle_loads(struct kvm_run run, struct kvm_vcpu vcpu,
	419	unsigned int rt, unsigned int bytes, int is_bigendian)
	420	{
	421	int r;
	422
	423	r = kvmppc_handle_load(run, vcpu, rt, bytes, is_bigendian);
	424	vcpu->arch.mmio_sign_extend = 1;
	425
	426	return r;
	427	}
	428
bbf45ba5	429	int kvmppc_handle_store(struct kvm_run run, struct kvm_vcpu vcpu,
b104d066	430	u64 val, unsigned int bytes, int is_bigendian)
bbf45ba5 HB	431	{
	432	void *data = run->mmio.data;
	433
	434	if (bytes > sizeof(run->mmio.data)) {
	435	printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
	436	run->mmio.len);
	437	}
	438
	439	run->mmio.phys_addr = vcpu->arch.paddr_accessed;
	440	run->mmio.len = bytes;
	441	run->mmio.is_write = 1;
	442	vcpu->mmio_needed = 1;
	443	vcpu->mmio_is_write = 1;
	444
	445	/* Store the value at the lowest bytes in 'data'. */
	446	if (is_bigendian) {
	447	switch (bytes) {
b104d066	448	case 8: (u64 )data = val; break;
bbf45ba5 HB	449	case 4: (u32 )data = val; break;
	450	case 2: (u16 )data = val; break;
	451	case 1: (u8 )data = val; break;
	452	}
	453	} else {
	454	/* Store LE value into 'data'. */
	455	switch (bytes) {
	456	case 4: st_le32(data, val); break;
	457	case 2: st_le16(data, val); break;
	458	case 1: (u8 )data = val; break;
	459	}
	460	}
	461
	462	return EMULATE_DO_MMIO;
	463	}
	464
	465	int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu vcpu, struct kvm_run run)
	466	{
	467	int r;
	468	sigset_t sigsaved;
	469
	470	if (vcpu->sigset_active)
	471	sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
	472
	473	if (vcpu->mmio_needed) {
	474	if (!vcpu->mmio_is_write)
	475	kvmppc_complete_mmio_load(vcpu, run);
	476	vcpu->mmio_needed = 0;
	477	} else if (vcpu->arch.dcr_needed) {
	478	if (!vcpu->arch.dcr_is_write)
	479	kvmppc_complete_dcr_load(vcpu, run);
	480	vcpu->arch.dcr_needed = 0;
ad0a048b AG	481	} else if (vcpu->arch.osi_needed) {
	482	u64 *gprs = run->osi.gprs;
	483	int i;
	484
	485	for (i = 0; i < 32; i++)
	486	kvmppc_set_gpr(vcpu, i, gprs[i]);
	487	vcpu->arch.osi_needed = 0;
bbf45ba5 HB	488	}
bbf45ba5 HB	489
9dd921cf	490	kvmppc_core_deliver_interrupts(vcpu);
bbf45ba5 HB	491
	492	local_irq_disable();
	493	kvm_guest_enter();
	494	r = __kvmppc_vcpu_run(run, vcpu);
	495	kvm_guest_exit();
	496	local_irq_enable();
	497
	498	if (vcpu->sigset_active)
	499	sigprocmask(SIG_SETMASK, &sigsaved, NULL);
	500
	501	return r;
	502	}
	503
	504	int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu vcpu, struct kvm_interrupt irq)
	505	{
18978768 AG	506	if (irq->irq == KVM_INTERRUPT_UNSET)
	507	kvmppc_core_dequeue_external(vcpu, irq);
	508	else
	509	kvmppc_core_queue_external(vcpu, irq);
45c5eb67 HB	510
	511	if (waitqueue_active(&vcpu->wq)) {
	512	wake_up_interruptible(&vcpu->wq);
	513	vcpu->stat.halt_wakeup++;
	514	}
	515
bbf45ba5 HB	516	return 0;
	517	}
	518
71fbfd5f AG	519	static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
	520	struct kvm_enable_cap *cap)
	521	{
	522	int r;
	523
	524	if (cap->flags)
	525	return -EINVAL;
	526
	527	switch (cap->cap) {
ad0a048b AG	528	case KVM_CAP_PPC_OSI:
	529	r = 0;
	530	vcpu->arch.osi_enabled = true;
	531	break;
71fbfd5f AG	532	default:
	533	r = -EINVAL;
	534	break;
	535	}
	536
	537	return r;
	538	}
	539
bbf45ba5 HB	540	int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
	541	struct kvm_mp_state *mp_state)
	542	{
	543	return -EINVAL;
	544	}
	545
	546	int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
	547	struct kvm_mp_state *mp_state)
	548	{
	549	return -EINVAL;
	550	}
	551
	552	long kvm_arch_vcpu_ioctl(struct file *filp,
	553	unsigned int ioctl, unsigned long arg)
	554	{
	555	struct kvm_vcpu *vcpu = filp->private_data;
	556	void __user argp = (void __user )arg;
	557	long r;
	558
93736624 AK	559	switch (ioctl) {
93736624 AK	560	case KVM_INTERRUPT: {
bbf45ba5 HB	561	struct kvm_interrupt irq;
	562	r = -EFAULT;
	563	if (copy_from_user(&irq, argp, sizeof(irq)))
93736624	564	goto out;
bbf45ba5	565	r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
93736624	566	goto out;
bbf45ba5	567	}
19483d14	568
71fbfd5f AG	569	case KVM_ENABLE_CAP:
	570	{
	571	struct kvm_enable_cap cap;
	572	r = -EFAULT;
	573	if (copy_from_user(&cap, argp, sizeof(cap)))
	574	goto out;
	575	r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
	576	break;
	577	}
bbf45ba5 HB	578	default:
	579	r = -EINVAL;
	580	}
	581
	582	out:
	583	return r;
	584	}
	585
15711e9c AG	586	static int kvm_vm_ioctl_get_pvinfo(struct kvm_ppc_pvinfo *pvinfo)
	587	{
	588	u32 inst_lis = 0x3c000000;
	589	u32 inst_ori = 0x60000000;
	590	u32 inst_nop = 0x60000000;
	591	u32 inst_sc = 0x44000002;
	592	u32 inst_imm_mask = 0xffff;
	593
	594	/*
	595	* The hypercall to get into KVM from within guest context is as
	596	* follows:
	597	*
	598	* lis r0, r0, KVM_SC_MAGIC_R0@h
	599	* ori r0, KVM_SC_MAGIC_R0@l
	600	* sc
	601	* nop
	602	*/
	603	pvinfo->hcall[0] = inst_lis \| ((KVM_SC_MAGIC_R0 >> 16) & inst_imm_mask);
	604	pvinfo->hcall[1] = inst_ori \| (KVM_SC_MAGIC_R0 & inst_imm_mask);
	605	pvinfo->hcall[2] = inst_sc;
	606	pvinfo->hcall[3] = inst_nop;
	607
	608	return 0;
	609	}
	610
bbf45ba5 HB	611	long kvm_arch_vm_ioctl(struct file *filp,
	612	unsigned int ioctl, unsigned long arg)
	613	{
15711e9c	614	void __user argp = (void __user )arg;
bbf45ba5 HB	615	long r;
	616
	617	switch (ioctl) {
15711e9c AG	618	case KVM_PPC_GET_PVINFO: {
15711e9c AG	619	struct kvm_ppc_pvinfo pvinfo;
d8cdddcd	620	memset(&pvinfo, 0, sizeof(pvinfo));
15711e9c AG	621	r = kvm_vm_ioctl_get_pvinfo(&pvinfo);
	622	if (copy_to_user(argp, &pvinfo, sizeof(pvinfo))) {
	623	r = -EFAULT;
	624	goto out;
	625	}
	626
	627	break;
	628	}
bbf45ba5	629	default:
367e1319	630	r = -ENOTTY;
bbf45ba5 HB	631	}
bbf45ba5 HB	632
15711e9c	633	out:
bbf45ba5 HB	634	return r;
	635	}
	636
	637	int kvm_arch_init(void *opaque)
	638	{
	639	return 0;
	640	}
	641
	642	void kvm_arch_exit(void)
	643	{
	644	}