[mirror_ubuntu-artful-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 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);
}

/**
 * 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);
}

/**
 * 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;

	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_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);

	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);

	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();

	if (implementor != ARM_CPU_IMP_ARM)
		return -EINVAL;

	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_A57:
		/* Currently handled by the generic backend */
		return KVM_ARM_TARGET_CORTEX_A57;
	default:
		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_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) {
102	case PSR_MODE_EL0t:
103	case PSR_MODE_EL1t:
104	case PSR_MODE_EL1h:
105	break;
106	default:
107	err = -EINVAL;
108	goto out;
109	}
110	}
111
112	memcpy((u32 *)regs + off, valp, KVM_REG_SIZE(reg->id));
113	out:
114	return err;
115	}
116
117	int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu vcpu, struct kvm_regs regs)
118	{
119	return -EINVAL;
120	}
121
122	int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu vcpu, struct kvm_regs regs)
123	{
124	return -EINVAL;
125	}
126
127	static unsigned long num_core_regs(void)
128	{
129	return sizeof(struct kvm_regs) / sizeof(__u32);
130	}
131
132	/**
133	* kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
134	*
135	* This is for all registers.
136	*/
137	unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
138	{
139	return num_core_regs() + kvm_arm_num_sys_reg_descs(vcpu);
140	}
141
142	/**
143	* kvm_arm_copy_reg_indices - get indices of all registers.
144	*
145	* We do core registers right here, then we apppend system regs.
146	*/
147	int kvm_arm_copy_reg_indices(struct kvm_vcpu vcpu, u64 __user uindices)
148	{
149	unsigned int i;
150	const u64 core_reg = KVM_REG_ARM64 \| KVM_REG_SIZE_U64 \| KVM_REG_ARM_CORE;
151
152	for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) {
153	if (put_user(core_reg \| i, uindices))
154	return -EFAULT;
155	uindices++;
156	}
157
158	return kvm_arm_copy_sys_reg_indices(vcpu, uindices);
159	}
160
161	int kvm_arm_get_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
162	{
163	/* We currently use nothing arch-specific in upper 32 bits */
164	if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
165	return -EINVAL;
166
167	/* Register group 16 means we want a core register. */
168	if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
169	return get_core_reg(vcpu, reg);
170
171	return kvm_arm_sys_reg_get_reg(vcpu, reg);
172	}
173
174	int kvm_arm_set_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
175	{
176	/* We currently use nothing arch-specific in upper 32 bits */
177	if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
178	return -EINVAL;
179
180	/* Register group 16 means we set a core register. */
181	if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
182	return set_core_reg(vcpu, reg);
183
184	return kvm_arm_sys_reg_set_reg(vcpu, reg);
185	}
186
187	int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
188	struct kvm_sregs *sregs)
189	{
190	return -EINVAL;
191	}
192
193	int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
194	struct kvm_sregs *sregs)
195	{
196	return -EINVAL;
197	}
198
199	int __attribute_const__ kvm_target_cpu(void)
200	{
201	unsigned long implementor = read_cpuid_implementor();
202	unsigned long part_number = read_cpuid_part_number();
203
204	if (implementor != ARM_CPU_IMP_ARM)
205	return -EINVAL;
206
207	switch (part_number) {
208	case ARM_CPU_PART_AEM_V8:
209	return KVM_ARM_TARGET_AEM_V8;
210	case ARM_CPU_PART_FOUNDATION:
211	return KVM_ARM_TARGET_FOUNDATION_V8;
212	case ARM_CPU_PART_CORTEX_A57:
213	/* Currently handled by the generic backend */
214	return KVM_ARM_TARGET_CORTEX_A57;
215	default:
216	return -EINVAL;
217	}
218	}
219
220	int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
221	const struct kvm_vcpu_init *init)
222	{
223	unsigned int i;
224	int phys_target = kvm_target_cpu();
225
226	if (init->target != phys_target)
227	return -EINVAL;
228
229	vcpu->arch.target = phys_target;
230	bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
231
232	/* -ENOENT for unknown features, -EINVAL for invalid combinations. */
233	for (i = 0; i < sizeof(init->features) * 8; i++) {
234	if (init->features[i / 32] & (1 << (i % 32))) {
235	if (i >= KVM_VCPU_MAX_FEATURES)
236	return -ENOENT;
237	set_bit(i, vcpu->arch.features);
238	}
239	}
240
241	/* Now we know what it is, we can reset it. */
242	return kvm_reset_vcpu(vcpu);
243	}
244
245	int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu vcpu, struct kvm_fpu fpu)
246	{
247	return -EINVAL;
248	}
249
250	int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu vcpu, struct kvm_fpu fpu)
251	{
252	return -EINVAL;
253	}
254
255	int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
256	struct kvm_translation *tr)
257	{
258	return -EINVAL;
259	}