2 * Copyright (C) 2012,2013 - ARM Ltd
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
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>
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.
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.
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/>.
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>
28 #include <asm/cputype.h>
29 #include <asm/uaccess.h>
31 #include <asm/kvm_asm.h>
32 #include <asm/kvm_emulate.h>
33 #include <asm/kvm_coproc.h>
35 struct kvm_stats_debugfs_item debugfs_entries[] = {
39 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
41 vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS;
45 static u64 core_reg_offset_from_id(u64 id)
47 return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
50 static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
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".
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);
63 /* Our ID is an index into the kvm_regs struct. */
64 off = core_reg_offset_from_id(reg->id);
66 (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
69 if (copy_to_user(uaddr, ((u32 *)regs) + off, KVM_REG_SIZE(reg->id)))
75 static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
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);
85 /* Our ID is an index into the kvm_regs struct. */
86 off = core_reg_offset_from_id(reg->id);
88 (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
91 if (KVM_REG_SIZE(reg->id) > sizeof(tmp))
94 if (copy_from_user(valp, uaddr, KVM_REG_SIZE(reg->id))) {
99 if (off == KVM_REG_ARM_CORE_REG(regs.pstate)) {
100 u32 mode = (*(u32 *)valp) & COMPAT_PSR_MODE_MASK;
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:
118 memcpy((u32 *)regs + off, valp, KVM_REG_SIZE(reg->id));
123 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
128 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
133 static unsigned long num_core_regs(void)
135 return sizeof(struct kvm_regs) / sizeof(__u32);
139 * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
141 * This is for all registers.
143 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
145 return num_core_regs() + kvm_arm_num_sys_reg_descs(vcpu);
149 * kvm_arm_copy_reg_indices - get indices of all registers.
151 * We do core registers right here, then we apppend system regs.
153 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
156 const u64 core_reg = KVM_REG_ARM64 | KVM_REG_SIZE_U64 | KVM_REG_ARM_CORE;
158 for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) {
159 if (put_user(core_reg | i, uindices))
164 return kvm_arm_copy_sys_reg_indices(vcpu, uindices);
167 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
169 /* We currently use nothing arch-specific in upper 32 bits */
170 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
173 /* Register group 16 means we want a core register. */
174 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
175 return get_core_reg(vcpu, reg);
177 return kvm_arm_sys_reg_get_reg(vcpu, reg);
180 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
182 /* We currently use nothing arch-specific in upper 32 bits */
183 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
186 /* Register group 16 means we set a core register. */
187 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
188 return set_core_reg(vcpu, reg);
190 return kvm_arm_sys_reg_set_reg(vcpu, reg);
193 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
194 struct kvm_sregs *sregs)
199 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
200 struct kvm_sregs *sregs)
205 int __attribute_const__ kvm_target_cpu(void)
207 unsigned long implementor = read_cpuid_implementor();
208 unsigned long part_number = read_cpuid_part_number();
210 switch (implementor) {
211 case ARM_CPU_IMP_ARM:
212 switch (part_number) {
213 case ARM_CPU_PART_AEM_V8:
214 return KVM_ARM_TARGET_AEM_V8;
215 case ARM_CPU_PART_FOUNDATION:
216 return KVM_ARM_TARGET_FOUNDATION_V8;
217 case ARM_CPU_PART_CORTEX_A57:
218 return KVM_ARM_TARGET_CORTEX_A57;
221 case ARM_CPU_IMP_APM:
222 switch (part_number) {
223 case APM_CPU_PART_POTENZA:
224 return KVM_ARM_TARGET_XGENE_POTENZA;
232 int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
233 const struct kvm_vcpu_init *init)
236 int phys_target = kvm_target_cpu();
238 if (init->target != phys_target)
241 vcpu->arch.target = phys_target;
242 bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
244 /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
245 for (i = 0; i < sizeof(init->features) * 8; i++) {
246 if (init->features[i / 32] & (1 << (i % 32))) {
247 if (i >= KVM_VCPU_MAX_FEATURES)
249 set_bit(i, vcpu->arch.features);
253 /* Now we know what it is, we can reset it. */
254 return kvm_reset_vcpu(vcpu);
257 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
259 int target = kvm_target_cpu();
264 memset(init, 0, sizeof(*init));
267 * For now, we don't return any features.
268 * In future, we might use features to return target
269 * specific features available for the preferred
272 init->target = (__u32)target;
277 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
282 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
287 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
288 struct kvm_translation *tr)