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_emulate.h>
32 #include <asm/kvm_coproc.h>
36 struct kvm_stats_debugfs_item debugfs_entries[] = {
40 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
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 * ARM64 versions of the TIMER registers, always available on arm64
142 #define NUM_TIMER_REGS 3
144 static bool is_timer_reg(u64 index)
147 case KVM_REG_ARM_TIMER_CTL:
148 case KVM_REG_ARM_TIMER_CNT:
149 case KVM_REG_ARM_TIMER_CVAL:
155 static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
157 if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
160 if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
163 if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
169 static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
171 void __user *uaddr = (void __user *)(long)reg->addr;
175 ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
179 return kvm_arm_timer_set_reg(vcpu, reg->id, val);
182 static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
184 void __user *uaddr = (void __user *)(long)reg->addr;
187 val = kvm_arm_timer_get_reg(vcpu, reg->id);
188 return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0;
192 * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
194 * This is for all registers.
196 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
198 return num_core_regs() + kvm_arm_num_sys_reg_descs(vcpu)
203 * kvm_arm_copy_reg_indices - get indices of all registers.
205 * We do core registers right here, then we apppend system regs.
207 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
210 const u64 core_reg = KVM_REG_ARM64 | KVM_REG_SIZE_U64 | KVM_REG_ARM_CORE;
213 for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) {
214 if (put_user(core_reg | i, uindices))
219 ret = copy_timer_indices(vcpu, uindices);
222 uindices += NUM_TIMER_REGS;
224 return kvm_arm_copy_sys_reg_indices(vcpu, uindices);
227 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
229 /* We currently use nothing arch-specific in upper 32 bits */
230 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
233 /* Register group 16 means we want a core register. */
234 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
235 return get_core_reg(vcpu, reg);
237 if (is_timer_reg(reg->id))
238 return get_timer_reg(vcpu, reg);
240 return kvm_arm_sys_reg_get_reg(vcpu, reg);
243 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
245 /* We currently use nothing arch-specific in upper 32 bits */
246 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
249 /* Register group 16 means we set a core register. */
250 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
251 return set_core_reg(vcpu, reg);
253 if (is_timer_reg(reg->id))
254 return set_timer_reg(vcpu, reg);
256 return kvm_arm_sys_reg_set_reg(vcpu, reg);
259 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
260 struct kvm_sregs *sregs)
265 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
266 struct kvm_sregs *sregs)
271 int __attribute_const__ kvm_target_cpu(void)
273 unsigned long implementor = read_cpuid_implementor();
274 unsigned long part_number = read_cpuid_part_number();
276 switch (implementor) {
277 case ARM_CPU_IMP_ARM:
278 switch (part_number) {
279 case ARM_CPU_PART_AEM_V8:
280 return KVM_ARM_TARGET_AEM_V8;
281 case ARM_CPU_PART_FOUNDATION:
282 return KVM_ARM_TARGET_FOUNDATION_V8;
283 case ARM_CPU_PART_CORTEX_A53:
284 return KVM_ARM_TARGET_CORTEX_A53;
285 case ARM_CPU_PART_CORTEX_A57:
286 return KVM_ARM_TARGET_CORTEX_A57;
289 case ARM_CPU_IMP_APM:
290 switch (part_number) {
291 case APM_CPU_PART_POTENZA:
292 return KVM_ARM_TARGET_XGENE_POTENZA;
297 /* Return a default generic target */
298 return KVM_ARM_TARGET_GENERIC_V8;
301 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
303 int target = kvm_target_cpu();
308 memset(init, 0, sizeof(*init));
311 * For now, we don't return any features.
312 * In future, we might use features to return target
313 * specific features available for the preferred
316 init->target = (__u32)target;
321 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
326 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
331 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
332 struct kvm_translation *tr)
337 #define KVM_GUESTDBG_VALID_MASK (KVM_GUESTDBG_ENABLE | \
338 KVM_GUESTDBG_USE_SW_BP | \
339 KVM_GUESTDBG_USE_HW | \
340 KVM_GUESTDBG_SINGLESTEP)
343 * kvm_arch_vcpu_ioctl_set_guest_debug - set up guest debugging
344 * @kvm: pointer to the KVM struct
345 * @kvm_guest_debug: the ioctl data buffer
347 * This sets up and enables the VM for guest debugging. Userspace
348 * passes in a control flag to enable different debug types and
349 * potentially other architecture specific information in the rest of
352 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
353 struct kvm_guest_debug *dbg)
355 trace_kvm_set_guest_debug(vcpu, dbg->control);
357 if (dbg->control & ~KVM_GUESTDBG_VALID_MASK)
360 if (dbg->control & KVM_GUESTDBG_ENABLE) {
361 vcpu->guest_debug = dbg->control;
363 /* Hardware assisted Break and Watch points */
364 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW) {
365 vcpu->arch.external_debug_state = dbg->arch;
369 /* If not enabled clear all flags */
370 vcpu->guest_debug = 0;