[deliverable/linux.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;
}

#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 -EFAULT;

	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));
}

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)
		+ NUM_TIMER_REGS;
}

/**
 * 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;
	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_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);

	if (is_timer_reg(reg->id))
		return get_timer_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);

	if (is_timer_reg(reg->id))
		return set_timer_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)
{
	switch (read_cpuid_part()) {
	case ARM_CPU_PART_CORTEX_A7:
		return KVM_ARM_TARGET_CORTEX_A7;
	case ARM_CPU_PART_CORTEX_A15:
		return KVM_ARM_TARGET_CORTEX_A15;
	default:
		return -EINVAL;
	}
}

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;
}

int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
					struct kvm_guest_debug *dbg)
{
	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
39735a3a AP	112	#define NUM_TIMER_REGS 3
	113
	114	static bool is_timer_reg(u64 index)
	115	{
	116	switch (index) {
	117	case KVM_REG_ARM_TIMER_CTL:
	118	case KVM_REG_ARM_TIMER_CNT:
	119	case KVM_REG_ARM_TIMER_CVAL:
	120	return true;
	121	}
	122	return false;
	123	}
	124
	125	static int copy_timer_indices(struct kvm_vcpu vcpu, u64 __user uindices)
	126	{
	127	if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
	128	return -EFAULT;
	129	uindices++;
	130	if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
	131	return -EFAULT;
	132	uindices++;
	133	if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
	134	return -EFAULT;
	135
	136	return 0;
	137	}
	138
39735a3a AP	139	static int set_timer_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
	140	{
	141	void __user uaddr = (void __user )(long)reg->addr;
	142	u64 val;
	143	int ret;
	144
	145	ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
	146	if (ret != 0)
bd218bce	147	return -EFAULT;
39735a3a AP	148
	149	return kvm_arm_timer_set_reg(vcpu, reg->id, val);
	150	}
	151
	152	static int get_timer_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
	153	{
	154	void __user uaddr = (void __user )(long)reg->addr;
	155	u64 val;
	156
	157	val = kvm_arm_timer_get_reg(vcpu, reg->id);
	158	return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id));
	159	}
	160
749cf76c CD	161	static unsigned long num_core_regs(void)
	162	{
	163	return sizeof(struct kvm_regs) / sizeof(u32);
	164	}
	165
	166	/**
	167	* kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
	168	*
	169	* This is for all registers.
	170	*/
	171	unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
	172	{
39735a3a AP	173	return num_core_regs() + kvm_arm_num_coproc_regs(vcpu)
39735a3a AP	174	+ NUM_TIMER_REGS;
749cf76c CD	175	}
	176
	177	/**
	178	* kvm_arm_copy_reg_indices - get indices of all registers.
	179	*
	180	* We do core registers right here, then we apppend coproc regs.
	181	*/
	182	int kvm_arm_copy_reg_indices(struct kvm_vcpu vcpu, u64 __user uindices)
	183	{
	184	unsigned int i;
	185	const u64 core_reg = KVM_REG_ARM \| KVM_REG_SIZE_U32 \| KVM_REG_ARM_CORE;
39735a3a	186	int ret;
749cf76c CD	187
	188	for (i = 0; i < sizeof(struct kvm_regs)/sizeof(u32); i++) {
	189	if (put_user(core_reg \| i, uindices))
	190	return -EFAULT;
	191	uindices++;
	192	}
	193
39735a3a AP	194	ret = copy_timer_indices(vcpu, uindices);
	195	if (ret)
	196	return ret;
	197	uindices += NUM_TIMER_REGS;
	198
1138245c	199	return kvm_arm_copy_coproc_indices(vcpu, uindices);
749cf76c CD	200	}
	201
	202	int kvm_arm_get_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
	203	{
	204	/* We currently use nothing arch-specific in upper 32 bits */
	205	if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
	206	return -EINVAL;
	207
	208	/* Register group 16 means we want a core register. */
	209	if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
	210	return get_core_reg(vcpu, reg);
	211
39735a3a AP	212	if (is_timer_reg(reg->id))
	213	return get_timer_reg(vcpu, reg);
	214
1138245c	215	return kvm_arm_coproc_get_reg(vcpu, reg);
749cf76c CD	216	}
	217
	218	int kvm_arm_set_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
	219	{
	220	/* We currently use nothing arch-specific in upper 32 bits */
	221	if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
	222	return -EINVAL;
	223
	224	/* Register group 16 means we set a core register. */
	225	if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
	226	return set_core_reg(vcpu, reg);
39735a3a AP	227
	228	if (is_timer_reg(reg->id))
	229	return set_timer_reg(vcpu, reg);
749cf76c	230
1138245c	231	return kvm_arm_coproc_set_reg(vcpu, reg);
749cf76c CD	232	}
	233
	234	int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
	235	struct kvm_sregs *sregs)
	236	{
	237	return -EINVAL;
	238	}
	239
	240	int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
	241	struct kvm_sregs *sregs)
	242	{
	243	return -EINVAL;
	244	}
	245
728d577d MZ	246	int __attribute_const__ kvm_target_cpu(void)
728d577d MZ	247	{
af040ffc	248	switch (read_cpuid_part()) {
e8c2d99f JA	249	case ARM_CPU_PART_CORTEX_A7:
e8c2d99f JA	250	return KVM_ARM_TARGET_CORTEX_A7;
728d577d MZ	251	case ARM_CPU_PART_CORTEX_A15:
	252	return KVM_ARM_TARGET_CORTEX_A15;
	253	default:
	254	return -EINVAL;
	255	}
	256	}
	257
4a6fee80 AP	258	int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
	259	{
	260	int target = kvm_target_cpu();
	261
	262	if (target < 0)
	263	return -ENODEV;
	264
	265	memset(init, 0, sizeof(*init));
	266
	267	/*
	268	* For now, we don't return any features.
	269	* In future, we might use features to return target
	270	* specific features available for the preferred
	271	* target type.
	272	*/
	273	init->target = (__u32)target;
	274
	275	return 0;
	276	}
	277
749cf76c CD	278	int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu vcpu, struct kvm_fpu fpu)
	279	{
	280	return -EINVAL;
	281	}
	282
	283	int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu vcpu, struct kvm_fpu fpu)
	284	{
	285	return -EINVAL;
	286	}
	287
	288	int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
	289	struct kvm_translation *tr)
	290	{
	291	return -EINVAL;
	292	}
0e6f07f2 AB	293
	294	int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
	295	struct kvm_guest_debug *dbg)
	296	{
	297	return -EINVAL;
	298	}