[mirror_ubuntu-bionic-kernel.git] / arch / arm64 / kvm / guest.c

/*
 * Copyright (C) 2012,2013 - ARM Ltd
 * Author: Marc Zyngier <marc.zyngier@arm.com>
 *
 * Derived from arch/arm/kvm/guest.c:
 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kvm_host.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <asm/cputype.h>
#include <asm/uaccess.h>
#include <asm/kvm.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_coproc.h>

struct kvm_stats_debugfs_item debugfs_entries[] = {
	{ NULL }
};

int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
	vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS;
	return 0;
}

static u64 core_reg_offset_from_id(u64 id)
{
	return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
}

static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
{
	/*
	 * Because the kvm_regs structure is a mix of 32, 64 and
	 * 128bit fields, we index it as if it was a 32bit
	 * array. Hence below, nr_regs is the number of entries, and
	 * off the index in the "array".
	 */
	__u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
	struct kvm_regs *regs = vcpu_gp_regs(vcpu);
	int nr_regs = sizeof(*regs) / sizeof(__u32);
	u32 off;

	/* Our ID is an index into the kvm_regs struct. */
	off = core_reg_offset_from_id(reg->id);
	if (off >= nr_regs ||
	    (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
		return -ENOENT;

	if (copy_to_user(uaddr, ((u32 *)regs) + off, KVM_REG_SIZE(reg->id)))
		return -EFAULT;

	return 0;
}

static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
{
	__u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
	struct kvm_regs *regs = vcpu_gp_regs(vcpu);
	int nr_regs = sizeof(*regs) / sizeof(__u32);
	__uint128_t tmp;
	void *valp = &tmp;
	u64 off;
	int err = 0;

	/* Our ID is an index into the kvm_regs struct. */
	off = core_reg_offset_from_id(reg->id);
	if (off >= nr_regs ||
	    (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
		return -ENOENT;

	if (KVM_REG_SIZE(reg->id) > sizeof(tmp))
		return -EINVAL;

	if (copy_from_user(valp, uaddr, KVM_REG_SIZE(reg->id))) {
		err = -EFAULT;
		goto out;
	}

	if (off == KVM_REG_ARM_CORE_REG(regs.pstate)) {
		u32 mode = (*(u32 *)valp) & COMPAT_PSR_MODE_MASK;
		switch (mode) {
		case COMPAT_PSR_MODE_USR:
		case COMPAT_PSR_MODE_FIQ:
		case COMPAT_PSR_MODE_IRQ:
		case COMPAT_PSR_MODE_SVC:
		case COMPAT_PSR_MODE_ABT:
		case COMPAT_PSR_MODE_UND:
		case PSR_MODE_EL0t:
		case PSR_MODE_EL1t:
		case PSR_MODE_EL1h:
			break;
		default:
			err = -EINVAL;
			goto out;
		}
	}

	memcpy((u32 *)regs + off, valp, KVM_REG_SIZE(reg->id));
out:
	return err;
}

int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
	return -EINVAL;
}

int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
	return -EINVAL;
}

static unsigned long num_core_regs(void)
{
	return sizeof(struct kvm_regs) / sizeof(__u32);
}

/**
 * ARM64 versions of the TIMER registers, always available on arm64
 */

#define NUM_TIMER_REGS 3

static bool is_timer_reg(u64 index)
{
	switch (index) {
	case KVM_REG_ARM_TIMER_CTL:
	case KVM_REG_ARM_TIMER_CNT:
	case KVM_REG_ARM_TIMER_CVAL:
		return true;
	}
	return false;
}

static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
{
	if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
		return -EFAULT;
	uindices++;
	if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
		return -EFAULT;
	uindices++;
	if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
		return -EFAULT;

	return 0;
}

static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
{
	void __user *uaddr = (void __user *)(long)reg->addr;
	u64 val;
	int ret;

	ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
	if (ret != 0)
		return ret;

	return kvm_arm_timer_set_reg(vcpu, reg->id, val);
}

static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
{
	void __user *uaddr = (void __user *)(long)reg->addr;
	u64 val;

	val = kvm_arm_timer_get_reg(vcpu, reg->id);
	return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id));
}

/**
 * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
 *
 * This is for all registers.
 */
unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
{
	return num_core_regs() + kvm_arm_num_sys_reg_descs(vcpu)
                + NUM_TIMER_REGS;
}

/**
 * kvm_arm_copy_reg_indices - get indices of all registers.
 *
 * We do core registers right here, then we apppend system regs.
 */
int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
{
	unsigned int i;
	const u64 core_reg = KVM_REG_ARM64 | KVM_REG_SIZE_U64 | KVM_REG_ARM_CORE;
	int ret;

	for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) {
		if (put_user(core_reg | i, uindices))
			return -EFAULT;
		uindices++;
	}

	ret = copy_timer_indices(vcpu, uindices);
	if (ret)
		return ret;
	uindices += NUM_TIMER_REGS;

	return kvm_arm_copy_sys_reg_indices(vcpu, uindices);
}

int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
{
	/* We currently use nothing arch-specific in upper 32 bits */
	if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
		return -EINVAL;

	/* Register group 16 means we want a core register. */
	if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
		return get_core_reg(vcpu, reg);

	if (is_timer_reg(reg->id))
		return get_timer_reg(vcpu, reg);

	return kvm_arm_sys_reg_get_reg(vcpu, reg);
}

int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
{
	/* We currently use nothing arch-specific in upper 32 bits */
	if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
		return -EINVAL;

	/* Register group 16 means we set a core register. */
	if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
		return set_core_reg(vcpu, reg);

	if (is_timer_reg(reg->id))
		return set_timer_reg(vcpu, reg);

	return kvm_arm_sys_reg_set_reg(vcpu, reg);
}

int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs)
{
	return -EINVAL;
}

int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs)
{
	return -EINVAL;
}

int __attribute_const__ kvm_target_cpu(void)
{
	unsigned long implementor = read_cpuid_implementor();
	unsigned long part_number = read_cpuid_part_number();

	switch (implementor) {
	case ARM_CPU_IMP_ARM:
		switch (part_number) {
		case ARM_CPU_PART_AEM_V8:
			return KVM_ARM_TARGET_AEM_V8;
		case ARM_CPU_PART_FOUNDATION:
			return KVM_ARM_TARGET_FOUNDATION_V8;
		case ARM_CPU_PART_CORTEX_A53:
			return KVM_ARM_TARGET_CORTEX_A53;
		case ARM_CPU_PART_CORTEX_A57:
			return KVM_ARM_TARGET_CORTEX_A57;
		};
		break;
	case ARM_CPU_IMP_APM:
		switch (part_number) {
		case APM_CPU_PART_POTENZA:
			return KVM_ARM_TARGET_XGENE_POTENZA;
		};
		break;
	};

	return -EINVAL;
}

int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
			const struct kvm_vcpu_init *init)
{
	unsigned int i;
	int phys_target = kvm_target_cpu();

	if (init->target != phys_target)
		return -EINVAL;

	vcpu->arch.target = phys_target;
	bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);

	/* -ENOENT for unknown features, -EINVAL for invalid combinations. */
	for (i = 0; i < sizeof(init->features) * 8; i++) {
		if (init->features[i / 32] & (1 << (i % 32))) {
			if (i >= KVM_VCPU_MAX_FEATURES)
				return -ENOENT;
			set_bit(i, vcpu->arch.features);
		}
	}

	/* Now we know what it is, we can reset it. */
	return kvm_reset_vcpu(vcpu);
}

int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
{
	int target = kvm_target_cpu();

	if (target < 0)
		return -ENODEV;

	memset(init, 0, sizeof(*init));

	/*
	 * For now, we don't return any features.
	 * In future, we might use features to return target
	 * specific features available for the preferred
	 * target type.
	 */
	init->target = (__u32)target;

	return 0;
}

int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
	return -EINVAL;
}

int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
	return -EINVAL;
}

int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
				  struct kvm_translation *tr)
{
	return -EINVAL;
}
Commit	Line	Data
2f4a07c5 MZ	1	/*
	2	* Copyright (C) 2012,2013 - ARM Ltd
	3	* Author: Marc Zyngier <marc.zyngier@arm.com>
	4	*
	5	* Derived from arch/arm/kvm/guest.c:
	6	* Copyright (C) 2012 - Virtual Open Systems and Columbia University
	7	* Author: Christoffer Dall <c.dall@virtualopensystems.com>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	20	*/
	21
	22	#include <linux/errno.h>
	23	#include <linux/err.h>
	24	#include <linux/kvm_host.h>
	25	#include <linux/module.h>
	26	#include <linux/vmalloc.h>
	27	#include <linux/fs.h>
	28	#include <asm/cputype.h>
	29	#include <asm/uaccess.h>
	30	#include <asm/kvm.h>
	31	#include <asm/kvm_asm.h>
	32	#include <asm/kvm_emulate.h>
	33	#include <asm/kvm_coproc.h>
	34
	35	struct kvm_stats_debugfs_item debugfs_entries[] = {
	36	{ NULL }
	37	};
	38
	39	int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
	40	{
	41	vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS;
	42	return 0;
	43	}
	44
	45	static u64 core_reg_offset_from_id(u64 id)
	46	{
	47	return id & ~(KVM_REG_ARCH_MASK \| KVM_REG_SIZE_MASK \| KVM_REG_ARM_CORE);
	48	}
	49
	50	static int get_core_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
	51	{
	52	/*
	53	* Because the kvm_regs structure is a mix of 32, 64 and
	54	* 128bit fields, we index it as if it was a 32bit
	55	* array. Hence below, nr_regs is the number of entries, and
	56	* off the index in the "array".
	57	*/
	58	__u32 __user uaddr = (__u32 __user )(unsigned long)reg->addr;
	59	struct kvm_regs *regs = vcpu_gp_regs(vcpu);
	60	int nr_regs = sizeof(*regs) / sizeof(__u32);
	61	u32 off;
	62
	63	/* Our ID is an index into the kvm_regs struct. */
	64	off = core_reg_offset_from_id(reg->id);
65	if (off >= nr_regs \|\|
66	(off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
67	return -ENOENT;
68
69	if (copy_to_user(uaddr, ((u32 *)regs) + off, KVM_REG_SIZE(reg->id)))
70	return -EFAULT;
71
72	return 0;
73	}
74
75	static int set_core_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
76	{
77	__u32 __user uaddr = (__u32 __user )(unsigned long)reg->addr;
78	struct kvm_regs *regs = vcpu_gp_regs(vcpu);
79	int nr_regs = sizeof(*regs) / sizeof(__u32);
80	__uint128_t tmp;
81	void *valp = &tmp;
82	u64 off;
83	int err = 0;
84
85	/* Our ID is an index into the kvm_regs struct. */
86	off = core_reg_offset_from_id(reg->id);
87	if (off >= nr_regs \|\|
88	(off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
89	return -ENOENT;
90
91	if (KVM_REG_SIZE(reg->id) > sizeof(tmp))
92	return -EINVAL;
93
94	if (copy_from_user(valp, uaddr, KVM_REG_SIZE(reg->id))) {
95	err = -EFAULT;
96	goto out;
97	}
98
99	if (off == KVM_REG_ARM_CORE_REG(regs.pstate)) {
100	u32 mode = ((u32 )valp) & COMPAT_PSR_MODE_MASK;
101	switch (mode) {
0d854a60 MZ	102	case COMPAT_PSR_MODE_USR:
	103	case COMPAT_PSR_MODE_FIQ:
	104	case COMPAT_PSR_MODE_IRQ:
	105	case COMPAT_PSR_MODE_SVC:
	106	case COMPAT_PSR_MODE_ABT:
	107	case COMPAT_PSR_MODE_UND:
2f4a07c5 MZ	108	case PSR_MODE_EL0t:
	109	case PSR_MODE_EL1t:
	110	case PSR_MODE_EL1h:
	111	break;
	112	default:
	113	err = -EINVAL;
	114	goto out;
	115	}
	116	}
	117
	118	memcpy((u32 *)regs + off, valp, KVM_REG_SIZE(reg->id));
	119	out:
	120	return err;
	121	}
	122
	123	int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu vcpu, struct kvm_regs regs)
	124	{
	125	return -EINVAL;
	126	}
	127
	128	int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu vcpu, struct kvm_regs regs)
	129	{
	130	return -EINVAL;
	131	}
	132
	133	static unsigned long num_core_regs(void)
	134	{
	135	return sizeof(struct kvm_regs) / sizeof(__u32);
	136	}
	137
1df08ba0 AB	138	/**
	139	* ARM64 versions of the TIMER registers, always available on arm64
	140	*/
	141
	142	#define NUM_TIMER_REGS 3
	143
	144	static bool is_timer_reg(u64 index)
	145	{
	146	switch (index) {
	147	case KVM_REG_ARM_TIMER_CTL:
	148	case KVM_REG_ARM_TIMER_CNT:
	149	case KVM_REG_ARM_TIMER_CVAL:
	150	return true;
	151	}
	152	return false;
	153	}
	154
	155	static int copy_timer_indices(struct kvm_vcpu vcpu, u64 __user uindices)
	156	{
	157	if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
	158	return -EFAULT;
	159	uindices++;
	160	if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
	161	return -EFAULT;
	162	uindices++;
	163	if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
	164	return -EFAULT;
	165
	166	return 0;
	167	}
	168
	169	static int set_timer_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
	170	{
	171	void __user uaddr = (void __user )(long)reg->addr;
	172	u64 val;
	173	int ret;
	174
	175	ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
	176	if (ret != 0)
	177	return ret;
	178
	179	return kvm_arm_timer_set_reg(vcpu, reg->id, val);
	180	}
	181
	182	static int get_timer_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
	183	{
	184	void __user uaddr = (void __user )(long)reg->addr;
	185	u64 val;
	186
	187	val = kvm_arm_timer_get_reg(vcpu, reg->id);
	188	return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id));
	189	}
	190
2f4a07c5 MZ	191	/**
	192	* kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
	193	*
	194	* This is for all registers.
	195	*/
	196	unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
	197	{
1df08ba0 AB	198	return num_core_regs() + kvm_arm_num_sys_reg_descs(vcpu)
1df08ba0 AB	199	+ NUM_TIMER_REGS;
2f4a07c5 MZ	200	}
	201
	202	/**
	203	* kvm_arm_copy_reg_indices - get indices of all registers.
	204	*
	205	* We do core registers right here, then we apppend system regs.
	206	*/
	207	int kvm_arm_copy_reg_indices(struct kvm_vcpu vcpu, u64 __user uindices)
	208	{
	209	unsigned int i;
	210	const u64 core_reg = KVM_REG_ARM64 \| KVM_REG_SIZE_U64 \| KVM_REG_ARM_CORE;
1df08ba0	211	int ret;
2f4a07c5 MZ	212
	213	for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) {
	214	if (put_user(core_reg \| i, uindices))
	215	return -EFAULT;
	216	uindices++;
	217	}
	218
1df08ba0 AB	219	ret = copy_timer_indices(vcpu, uindices);
	220	if (ret)
	221	return ret;
	222	uindices += NUM_TIMER_REGS;
	223
2f4a07c5 MZ	224	return kvm_arm_copy_sys_reg_indices(vcpu, uindices);
	225	}
	226
	227	int kvm_arm_get_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
	228	{
	229	/* We currently use nothing arch-specific in upper 32 bits */
	230	if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
	231	return -EINVAL;
	232
	233	/* Register group 16 means we want a core register. */
	234	if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
	235	return get_core_reg(vcpu, reg);
	236
1df08ba0 AB	237	if (is_timer_reg(reg->id))
	238	return get_timer_reg(vcpu, reg);
	239
2f4a07c5 MZ	240	return kvm_arm_sys_reg_get_reg(vcpu, reg);
	241	}
	242
	243	int kvm_arm_set_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
	244	{
	245	/* We currently use nothing arch-specific in upper 32 bits */
	246	if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
	247	return -EINVAL;
	248
	249	/* Register group 16 means we set a core register. */
	250	if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
	251	return set_core_reg(vcpu, reg);
	252
1df08ba0 AB	253	if (is_timer_reg(reg->id))
	254	return set_timer_reg(vcpu, reg);
	255
2f4a07c5 MZ	256	return kvm_arm_sys_reg_set_reg(vcpu, reg);
	257	}
	258
	259	int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
	260	struct kvm_sregs *sregs)
	261	{
	262	return -EINVAL;
	263	}
	264
	265	int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
	266	struct kvm_sregs *sregs)
	267	{
	268	return -EINVAL;
	269	}
	270
	271	int __attribute_const__ kvm_target_cpu(void)
	272	{
	273	unsigned long implementor = read_cpuid_implementor();
	274	unsigned long part_number = read_cpuid_part_number();
	275
e28100bd AP	276	switch (implementor) {
	277	case ARM_CPU_IMP_ARM:
	278	switch (part_number) {
	279	case ARM_CPU_PART_AEM_V8:
	280	return KVM_ARM_TARGET_AEM_V8;
	281	case ARM_CPU_PART_FOUNDATION:
	282	return KVM_ARM_TARGET_FOUNDATION_V8;
1252b331 MZ	283	case ARM_CPU_PART_CORTEX_A53:
1252b331 MZ	284	return KVM_ARM_TARGET_CORTEX_A53;
e28100bd AP	285	case ARM_CPU_PART_CORTEX_A57:
	286	return KVM_ARM_TARGET_CORTEX_A57;
	287	};
	288	break;
	289	case ARM_CPU_IMP_APM:
	290	switch (part_number) {
	291	case APM_CPU_PART_POTENZA:
	292	return KVM_ARM_TARGET_XGENE_POTENZA;
	293	};
	294	break;
	295	};
2f4a07c5	296
e28100bd	297	return -EINVAL;
2f4a07c5 MZ	298	}
	299
	300	int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
	301	const struct kvm_vcpu_init *init)
	302	{
	303	unsigned int i;
	304	int phys_target = kvm_target_cpu();
	305
	306	if (init->target != phys_target)
	307	return -EINVAL;
	308
	309	vcpu->arch.target = phys_target;
	310	bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
	311
	312	/* -ENOENT for unknown features, -EINVAL for invalid combinations. */
	313	for (i = 0; i < sizeof(init->features) * 8; i++) {
	314	if (init->features[i / 32] & (1 << (i % 32))) {
	315	if (i >= KVM_VCPU_MAX_FEATURES)
	316	return -ENOENT;
	317	set_bit(i, vcpu->arch.features);
	318	}
	319	}
	320
	321	/* Now we know what it is, we can reset it. */
	322	return kvm_reset_vcpu(vcpu);
	323	}
	324
473bdc0e AP	325	int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
	326	{
	327	int target = kvm_target_cpu();
	328
	329	if (target < 0)
	330	return -ENODEV;
	331
	332	memset(init, 0, sizeof(*init));
	333
	334	/*
	335	* For now, we don't return any features.
	336	* In future, we might use features to return target
	337	* specific features available for the preferred
	338	* target type.
	339	*/
	340	init->target = (__u32)target;
	341
	342	return 0;
	343	}
	344
2f4a07c5 MZ	345	int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu vcpu, struct kvm_fpu fpu)
	346	{
	347	return -EINVAL;
	348	}
	349
	350	int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu vcpu, struct kvm_fpu fpu)
	351	{
	352	return -EINVAL;
	353	}
	354
	355	int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
	356	struct kvm_translation *tr)
	357	{
	358	return -EINVAL;
	359	}