[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/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 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>
	25	#include <asm/uaccess.h>
	26	#include <asm/kvm.h>
	27	#include <asm/kvm_asm.h>
	28	#include <asm/kvm_emulate.h>
1138245c	29	#include <asm/kvm_coproc.h>
749cf76c CD	30
	31	#define VM_STAT(x) { #x, offsetof(struct kvm, stat.x), KVM_STAT_VM }
	32	#define VCPU_STAT(x) { #x, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU }
	33
	34	struct kvm_stats_debugfs_item debugfs_entries[] = {
	35	{ NULL }
	36	};
	37
	38	int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
	39	{
	40	return 0;
	41	}
	42
	43	static u64 core_reg_offset_from_id(u64 id)
	44	{
	45	return id & ~(KVM_REG_ARCH_MASK \| KVM_REG_SIZE_MASK \| KVM_REG_ARM_CORE);
	46	}
	47
	48	static int get_core_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
	49	{
	50	u32 __user uaddr = (u32 __user )(long)reg->addr;
	51	struct kvm_regs *regs = &vcpu->arch.regs;
	52	u64 off;
	53
	54	if (KVM_REG_SIZE(reg->id) != 4)
	55	return -ENOENT;
	56
	57	/* Our ID is an index into the kvm_regs struct. */
	58	off = core_reg_offset_from_id(reg->id);
	59	if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
	60	return -ENOENT;
	61
	62	return put_user(((u32 *)regs)[off], uaddr);
	63	}
	64
	65	static int set_core_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
	66	{
	67	u32 __user uaddr = (u32 __user )(long)reg->addr;
	68	struct kvm_regs *regs = &vcpu->arch.regs;
	69	u64 off, val;
	70
	71	if (KVM_REG_SIZE(reg->id) != 4)
	72	return -ENOENT;
	73
	74	/* Our ID is an index into the kvm_regs struct. */
	75	off = core_reg_offset_from_id(reg->id);
	76	if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
	77	return -ENOENT;
	78
	79	if (get_user(val, uaddr) != 0)
	80	return -EFAULT;
	81
	82	if (off == KVM_REG_ARM_CORE_REG(usr_regs.ARM_cpsr)) {
	83	unsigned long mode = val & MODE_MASK;
	84	switch (mode) {
	85	case USR_MODE:
	86	case FIQ_MODE:
	87	case IRQ_MODE:
	88	case SVC_MODE:
	89	case ABT_MODE:
	90	case UND_MODE:
	91	break;
	92	default:
	93	return -EINVAL;
94	}
95	}
96
97	((u32 *)regs)[off] = val;
98	return 0;
99	}
100
101	int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu vcpu, struct kvm_regs regs)
102	{
103	return -EINVAL;
104	}
105
106	int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu vcpu, struct kvm_regs regs)
107	{
108	return -EINVAL;
109	}
110
111	static unsigned long num_core_regs(void)
112	{
113	return sizeof(struct kvm_regs) / sizeof(u32);
114	}
115
116	/**
117	* kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
118	*
119	* This is for all registers.
120	*/
121	unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
122	{
1138245c	123	return num_core_regs() + kvm_arm_num_coproc_regs(vcpu);
749cf76c CD	124	}
	125
	126	/**
	127	* kvm_arm_copy_reg_indices - get indices of all registers.
	128	*
	129	* We do core registers right here, then we apppend coproc regs.
	130	*/
	131	int kvm_arm_copy_reg_indices(struct kvm_vcpu vcpu, u64 __user uindices)
	132	{
	133	unsigned int i;
	134	const u64 core_reg = KVM_REG_ARM \| KVM_REG_SIZE_U32 \| KVM_REG_ARM_CORE;
	135
	136	for (i = 0; i < sizeof(struct kvm_regs)/sizeof(u32); i++) {
	137	if (put_user(core_reg \| i, uindices))
	138	return -EFAULT;
	139	uindices++;
	140	}
	141
1138245c	142	return kvm_arm_copy_coproc_indices(vcpu, uindices);
749cf76c CD	143	}
	144
	145	int kvm_arm_get_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
	146	{
	147	/* We currently use nothing arch-specific in upper 32 bits */
	148	if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
	149	return -EINVAL;
	150
	151	/* Register group 16 means we want a core register. */
	152	if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
	153	return get_core_reg(vcpu, reg);
	154
1138245c	155	return kvm_arm_coproc_get_reg(vcpu, reg);
749cf76c CD	156	}
	157
	158	int kvm_arm_set_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
	159	{
	160	/* We currently use nothing arch-specific in upper 32 bits */
	161	if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
	162	return -EINVAL;
	163
	164	/* Register group 16 means we set a core register. */
	165	if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
	166	return set_core_reg(vcpu, reg);
	167
1138245c	168	return kvm_arm_coproc_set_reg(vcpu, reg);
749cf76c CD	169	}
	170
	171	int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
	172	struct kvm_sregs *sregs)
	173	{
	174	return -EINVAL;
	175	}
	176
	177	int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
	178	struct kvm_sregs *sregs)
	179	{
	180	return -EINVAL;
	181	}
	182
	183	int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
	184	const struct kvm_vcpu_init *init)
	185	{
	186	unsigned int i;
	187
	188	/* We can only do a cortex A15 for now. */
	189	if (init->target != kvm_target_cpu())
	190	return -EINVAL;
	191
	192	vcpu->arch.target = init->target;
	193	bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
	194
	195	/* -ENOENT for unknown features, -EINVAL for invalid combinations. */
	196	for (i = 0; i < sizeof(init->features) * 8; i++) {
	197	if (test_bit(i, (void *)init->features)) {
	198	if (i >= KVM_VCPU_MAX_FEATURES)
	199	return -ENOENT;
	200	set_bit(i, vcpu->arch.features);
	201	}
	202	}
	203
	204	/* Now we know what it is, we can reset it. */
	205	return kvm_reset_vcpu(vcpu);
	206	}
	207
	208	int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu vcpu, struct kvm_fpu fpu)
	209	{
	210	return -EINVAL;
	211	}
	212
	213	int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu vcpu, struct kvm_fpu fpu)
	214	{
	215	return -EINVAL;
	216	}
	217
	218	int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
	219	struct kvm_translation *tr)
	220	{
	221	return -EINVAL;
	222	}