[linux-2.6-block.git] / 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, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#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>

#define VM_STAT(x) { #x, offsetof(struct kvm, stat.x), KVM_STAT_VM }
#define VCPU_STAT(x) { #x, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU }

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

int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
	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)
{
	u32 __user *uaddr = (u32 __user *)(long)reg->addr;
	struct kvm_regs *regs = &vcpu->arch.regs;
	u64 off;

	if (KVM_REG_SIZE(reg->id) != 4)
		return -ENOENT;

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

	return put_user(((u32 *)regs)[off], uaddr);
}

static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
{
	u32 __user *uaddr = (u32 __user *)(long)reg->addr;
	struct kvm_regs *regs = &vcpu->arch.regs;
	u64 off, val;

	if (KVM_REG_SIZE(reg->id) != 4)
		return -ENOENT;

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

	if (get_user(val, uaddr) != 0)
		return -EFAULT;

	if (off == KVM_REG_ARM_CORE_REG(usr_regs.ARM_cpsr)) {
		unsigned long mode = val & MODE_MASK;
		switch (mode) {
		case USR_MODE:
		case FIQ_MODE:
		case IRQ_MODE:
		case SVC_MODE:
		case ABT_MODE:
		case UND_MODE:
			break;
		default:
			return -EINVAL;
		}
	}

	((u32 *)regs)[off] = val;
	return 0;
}

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);
}

/**
 * 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_coproc_regs(vcpu);
}

/**
 * kvm_arm_copy_reg_indices - get indices of all registers.
 *
 * We do core registers right here, then we apppend coproc regs.
 */
int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
{
	unsigned int i;
	const u64 core_reg = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_CORE;

	for (i = 0; i < sizeof(struct kvm_regs)/sizeof(u32); i++) {
		if (put_user(core_reg | i, uindices))
			return -EFAULT;
		uindices++;
	}

	return kvm_arm_copy_coproc_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_ARM >> 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);

	return kvm_arm_coproc_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_ARM >> 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);

	return kvm_arm_coproc_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();

	if (implementor != ARM_CPU_IMP_ARM)
		return -EINVAL;

	switch (part_number) {
	case ARM_CPU_PART_CORTEX_A15:
		return KVM_ARM_TARGET_CORTEX_A15;
	default:
		return -EINVAL;
	}
}

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

	/* We can only do a cortex A15 for now. */
	if (init->target != kvm_target_cpu())
		return -EINVAL;

	vcpu->arch.target = init->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 (test_bit(i, (void *)init->features)) {
			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_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
749cf76c CD	1	/*
	2	* Copyright (C) 2012 - Virtual Open Systems and Columbia University
	3	* Author: Christoffer Dall <c.dall@virtualopensystems.com>
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License, version 2, as
	7	* published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	17	*/
	18
	19	#include <linux/errno.h>
	20	#include <linux/err.h>
	21	#include <linux/kvm_host.h>
	22	#include <linux/module.h>
	23	#include <linux/vmalloc.h>
	24	#include <linux/fs.h>
728d577d	25	#include <asm/cputype.h>
749cf76c CD	26	#include <asm/uaccess.h>
	27	#include <asm/kvm.h>
	28	#include <asm/kvm_asm.h>
	29	#include <asm/kvm_emulate.h>
1138245c	30	#include <asm/kvm_coproc.h>
749cf76c CD	31
	32	#define VM_STAT(x) { #x, offsetof(struct kvm, stat.x), KVM_STAT_VM }
	33	#define VCPU_STAT(x) { #x, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU }
	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	return 0;
	42	}
	43
	44	static u64 core_reg_offset_from_id(u64 id)
	45	{
	46	return id & ~(KVM_REG_ARCH_MASK \| KVM_REG_SIZE_MASK \| KVM_REG_ARM_CORE);
	47	}
	48
	49	static int get_core_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
	50	{
	51	u32 __user uaddr = (u32 __user )(long)reg->addr;
	52	struct kvm_regs *regs = &vcpu->arch.regs;
	53	u64 off;
	54
	55	if (KVM_REG_SIZE(reg->id) != 4)
	56	return -ENOENT;
	57
	58	/* Our ID is an index into the kvm_regs struct. */
	59	off = core_reg_offset_from_id(reg->id);
	60	if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
	61	return -ENOENT;
	62
	63	return put_user(((u32 *)regs)[off], uaddr);
	64	}
	65
	66	static int set_core_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
	67	{
	68	u32 __user uaddr = (u32 __user )(long)reg->addr;
	69	struct kvm_regs *regs = &vcpu->arch.regs;
	70	u64 off, val;
	71
	72	if (KVM_REG_SIZE(reg->id) != 4)
	73	return -ENOENT;
	74
	75	/* Our ID is an index into the kvm_regs struct. */
	76	off = core_reg_offset_from_id(reg->id);
	77	if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
	78	return -ENOENT;
	79
	80	if (get_user(val, uaddr) != 0)
	81	return -EFAULT;
	82
	83	if (off == KVM_REG_ARM_CORE_REG(usr_regs.ARM_cpsr)) {
	84	unsigned long mode = val & MODE_MASK;
	85	switch (mode) {
	86	case USR_MODE:
	87	case FIQ_MODE:
	88	case IRQ_MODE:
	89	case SVC_MODE:
	90	case ABT_MODE:
	91	case UND_MODE:
	92	break;
	93	default:
	94	return -EINVAL;
95	}
96	}
97
98	((u32 *)regs)[off] = val;
99	return 0;
100	}
101
102	int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu vcpu, struct kvm_regs regs)
103	{
104	return -EINVAL;
105	}
106
107	int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu vcpu, struct kvm_regs regs)
108	{
109	return -EINVAL;
110	}
111
112	static unsigned long num_core_regs(void)
113	{
114	return sizeof(struct kvm_regs) / sizeof(u32);
115	}
116
117	/**
118	* kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
119	*
120	* This is for all registers.
121	*/
122	unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
123	{
1138245c	124	return num_core_regs() + kvm_arm_num_coproc_regs(vcpu);
749cf76c CD	125	}
	126
	127	/**
	128	* kvm_arm_copy_reg_indices - get indices of all registers.
	129	*
	130	* We do core registers right here, then we apppend coproc regs.
	131	*/
	132	int kvm_arm_copy_reg_indices(struct kvm_vcpu vcpu, u64 __user uindices)
	133	{
	134	unsigned int i;
	135	const u64 core_reg = KVM_REG_ARM \| KVM_REG_SIZE_U32 \| KVM_REG_ARM_CORE;
	136
	137	for (i = 0; i < sizeof(struct kvm_regs)/sizeof(u32); i++) {
	138	if (put_user(core_reg \| i, uindices))
	139	return -EFAULT;
	140	uindices++;
	141	}
	142
1138245c	143	return kvm_arm_copy_coproc_indices(vcpu, uindices);
749cf76c CD	144	}
	145
	146	int kvm_arm_get_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
	147	{
	148	/* We currently use nothing arch-specific in upper 32 bits */
	149	if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
	150	return -EINVAL;
	151
	152	/* Register group 16 means we want a core register. */
	153	if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
	154	return get_core_reg(vcpu, reg);
	155
1138245c	156	return kvm_arm_coproc_get_reg(vcpu, reg);
749cf76c CD	157	}
	158
	159	int kvm_arm_set_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
	160	{
	161	/* We currently use nothing arch-specific in upper 32 bits */
	162	if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
	163	return -EINVAL;
	164
	165	/* Register group 16 means we set a core register. */
	166	if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
	167	return set_core_reg(vcpu, reg);
	168
1138245c	169	return kvm_arm_coproc_set_reg(vcpu, reg);
749cf76c CD	170	}
	171
	172	int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
	173	struct kvm_sregs *sregs)
	174	{
	175	return -EINVAL;
	176	}
	177
	178	int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
	179	struct kvm_sregs *sregs)
	180	{
	181	return -EINVAL;
	182	}
	183
728d577d MZ	184	int __attribute_const__ kvm_target_cpu(void)
	185	{
	186	unsigned long implementor = read_cpuid_implementor();
	187	unsigned long part_number = read_cpuid_part_number();
	188
	189	if (implementor != ARM_CPU_IMP_ARM)
	190	return -EINVAL;
	191
	192	switch (part_number) {
	193	case ARM_CPU_PART_CORTEX_A15:
	194	return KVM_ARM_TARGET_CORTEX_A15;
	195	default:
	196	return -EINVAL;
	197	}
	198	}
	199
749cf76c CD	200	int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
	201	const struct kvm_vcpu_init *init)
	202	{
	203	unsigned int i;
	204
	205	/* We can only do a cortex A15 for now. */
	206	if (init->target != kvm_target_cpu())
	207	return -EINVAL;
	208
	209	vcpu->arch.target = init->target;
	210	bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
	211
	212	/* -ENOENT for unknown features, -EINVAL for invalid combinations. */
	213	for (i = 0; i < sizeof(init->features) * 8; i++) {
	214	if (test_bit(i, (void *)init->features)) {
	215	if (i >= KVM_VCPU_MAX_FEATURES)
	216	return -ENOENT;
	217	set_bit(i, vcpu->arch.features);
	218	}
	219	}
	220
	221	/* Now we know what it is, we can reset it. */
	222	return kvm_reset_vcpu(vcpu);
	223	}
	224
	225	int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu vcpu, struct kvm_fpu fpu)
	226	{
	227	return -EINVAL;
	228	}
	229
	230	int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu vcpu, struct kvm_fpu fpu)
	231	{
	232	return -EINVAL;
	233	}
	234
	235	int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
	236	struct kvm_translation *tr)
	237	{
	238	return -EINVAL;
	239	}