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 <kvm/arm_psci.h>
29 #include <asm/cputype.h>
30 #include <linux/uaccess.h>
32 #include <asm/kvm_emulate.h>
33 #include <asm/kvm_coproc.h>
37 #define VM_STAT(x) { #x, offsetof(struct kvm, stat.x), KVM_STAT_VM }
38 #define VCPU_STAT(x) { #x, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU }
40 struct kvm_stats_debugfs_item debugfs_entries[] = {
41 VCPU_STAT(hvc_exit_stat),
42 VCPU_STAT(wfe_exit_stat),
43 VCPU_STAT(wfi_exit_stat),
44 VCPU_STAT(mmio_exit_user),
45 VCPU_STAT(mmio_exit_kernel),
50 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
55 static u64 core_reg_offset_from_id(u64 id)
57 return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
60 static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
63 * Because the kvm_regs structure is a mix of 32, 64 and
64 * 128bit fields, we index it as if it was a 32bit
65 * array. Hence below, nr_regs is the number of entries, and
66 * off the index in the "array".
68 __u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
69 struct kvm_regs *regs = vcpu_gp_regs(vcpu);
70 int nr_regs = sizeof(*regs) / sizeof(__u32);
73 /* Our ID is an index into the kvm_regs struct. */
74 off = core_reg_offset_from_id(reg->id);
76 (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
79 if (copy_to_user(uaddr, ((u32 *)regs) + off, KVM_REG_SIZE(reg->id)))
85 static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
87 __u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
88 struct kvm_regs *regs = vcpu_gp_regs(vcpu);
89 int nr_regs = sizeof(*regs) / sizeof(__u32);
95 /* Our ID is an index into the kvm_regs struct. */
96 off = core_reg_offset_from_id(reg->id);
98 (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
101 if (KVM_REG_SIZE(reg->id) > sizeof(tmp))
104 if (copy_from_user(valp, uaddr, KVM_REG_SIZE(reg->id))) {
109 if (off == KVM_REG_ARM_CORE_REG(regs.pstate)) {
110 u32 mode = (*(u32 *)valp) & PSR_AA32_MODE_MASK;
112 case PSR_AA32_MODE_USR:
113 case PSR_AA32_MODE_FIQ:
114 case PSR_AA32_MODE_IRQ:
115 case PSR_AA32_MODE_SVC:
116 case PSR_AA32_MODE_ABT:
117 case PSR_AA32_MODE_UND:
128 memcpy((u32 *)regs + off, valp, KVM_REG_SIZE(reg->id));
133 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
138 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
143 static unsigned long num_core_regs(void)
145 return sizeof(struct kvm_regs) / sizeof(__u32);
149 * ARM64 versions of the TIMER registers, always available on arm64
152 #define NUM_TIMER_REGS 3
154 static bool is_timer_reg(u64 index)
157 case KVM_REG_ARM_TIMER_CTL:
158 case KVM_REG_ARM_TIMER_CNT:
159 case KVM_REG_ARM_TIMER_CVAL:
165 static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
167 if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
170 if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
173 if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
179 static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
181 void __user *uaddr = (void __user *)(long)reg->addr;
185 ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
189 return kvm_arm_timer_set_reg(vcpu, reg->id, val);
192 static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
194 void __user *uaddr = (void __user *)(long)reg->addr;
197 val = kvm_arm_timer_get_reg(vcpu, reg->id);
198 return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0;
202 * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
204 * This is for all registers.
206 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
208 return num_core_regs() + kvm_arm_num_sys_reg_descs(vcpu)
209 + kvm_arm_get_fw_num_regs(vcpu) + NUM_TIMER_REGS;
213 * kvm_arm_copy_reg_indices - get indices of all registers.
215 * We do core registers right here, then we append system regs.
217 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
220 const u64 core_reg = KVM_REG_ARM64 | KVM_REG_SIZE_U64 | KVM_REG_ARM_CORE;
223 for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) {
224 if (put_user(core_reg | i, uindices))
229 ret = kvm_arm_copy_fw_reg_indices(vcpu, uindices);
232 uindices += kvm_arm_get_fw_num_regs(vcpu);
234 ret = copy_timer_indices(vcpu, uindices);
237 uindices += NUM_TIMER_REGS;
239 return kvm_arm_copy_sys_reg_indices(vcpu, uindices);
242 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
244 /* We currently use nothing arch-specific in upper 32 bits */
245 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
248 /* Register group 16 means we want a core register. */
249 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
250 return get_core_reg(vcpu, reg);
252 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
253 return kvm_arm_get_fw_reg(vcpu, reg);
255 if (is_timer_reg(reg->id))
256 return get_timer_reg(vcpu, reg);
258 return kvm_arm_sys_reg_get_reg(vcpu, reg);
261 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
263 /* We currently use nothing arch-specific in upper 32 bits */
264 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
267 /* Register group 16 means we set a core register. */
268 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
269 return set_core_reg(vcpu, reg);
271 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
272 return kvm_arm_set_fw_reg(vcpu, reg);
274 if (is_timer_reg(reg->id))
275 return set_timer_reg(vcpu, reg);
277 return kvm_arm_sys_reg_set_reg(vcpu, reg);
280 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
281 struct kvm_sregs *sregs)
286 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
287 struct kvm_sregs *sregs)
292 int __kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
293 struct kvm_vcpu_events *events)
295 events->exception.serror_pending = !!(vcpu->arch.hcr_el2 & HCR_VSE);
296 events->exception.serror_has_esr = cpus_have_const_cap(ARM64_HAS_RAS_EXTN);
298 if (events->exception.serror_pending && events->exception.serror_has_esr)
299 events->exception.serror_esr = vcpu_get_vsesr(vcpu);
304 int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
305 struct kvm_vcpu_events *events)
307 bool serror_pending = events->exception.serror_pending;
308 bool has_esr = events->exception.serror_has_esr;
310 if (serror_pending && has_esr) {
311 if (!cpus_have_const_cap(ARM64_HAS_RAS_EXTN))
314 if (!((events->exception.serror_esr) & ~ESR_ELx_ISS_MASK))
315 kvm_set_sei_esr(vcpu, events->exception.serror_esr);
318 } else if (serror_pending) {
319 kvm_inject_vabt(vcpu);
325 int __attribute_const__ kvm_target_cpu(void)
327 unsigned long implementor = read_cpuid_implementor();
328 unsigned long part_number = read_cpuid_part_number();
330 switch (implementor) {
331 case ARM_CPU_IMP_ARM:
332 switch (part_number) {
333 case ARM_CPU_PART_AEM_V8:
334 return KVM_ARM_TARGET_AEM_V8;
335 case ARM_CPU_PART_FOUNDATION:
336 return KVM_ARM_TARGET_FOUNDATION_V8;
337 case ARM_CPU_PART_CORTEX_A53:
338 return KVM_ARM_TARGET_CORTEX_A53;
339 case ARM_CPU_PART_CORTEX_A57:
340 return KVM_ARM_TARGET_CORTEX_A57;
343 case ARM_CPU_IMP_APM:
344 switch (part_number) {
345 case APM_CPU_PART_POTENZA:
346 return KVM_ARM_TARGET_XGENE_POTENZA;
351 /* Return a default generic target */
352 return KVM_ARM_TARGET_GENERIC_V8;
355 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
357 int target = kvm_target_cpu();
362 memset(init, 0, sizeof(*init));
365 * For now, we don't return any features.
366 * In future, we might use features to return target
367 * specific features available for the preferred
370 init->target = (__u32)target;
375 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
380 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
385 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
386 struct kvm_translation *tr)
391 #define KVM_GUESTDBG_VALID_MASK (KVM_GUESTDBG_ENABLE | \
392 KVM_GUESTDBG_USE_SW_BP | \
393 KVM_GUESTDBG_USE_HW | \
394 KVM_GUESTDBG_SINGLESTEP)
397 * kvm_arch_vcpu_ioctl_set_guest_debug - set up guest debugging
398 * @kvm: pointer to the KVM struct
399 * @kvm_guest_debug: the ioctl data buffer
401 * This sets up and enables the VM for guest debugging. Userspace
402 * passes in a control flag to enable different debug types and
403 * potentially other architecture specific information in the rest of
406 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
407 struct kvm_guest_debug *dbg)
411 trace_kvm_set_guest_debug(vcpu, dbg->control);
413 if (dbg->control & ~KVM_GUESTDBG_VALID_MASK) {
418 if (dbg->control & KVM_GUESTDBG_ENABLE) {
419 vcpu->guest_debug = dbg->control;
421 /* Hardware assisted Break and Watch points */
422 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW) {
423 vcpu->arch.external_debug_state = dbg->arch;
427 /* If not enabled clear all flags */
428 vcpu->guest_debug = 0;
435 int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
436 struct kvm_device_attr *attr)
440 switch (attr->group) {
441 case KVM_ARM_VCPU_PMU_V3_CTRL:
442 ret = kvm_arm_pmu_v3_set_attr(vcpu, attr);
444 case KVM_ARM_VCPU_TIMER_CTRL:
445 ret = kvm_arm_timer_set_attr(vcpu, attr);
455 int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
456 struct kvm_device_attr *attr)
460 switch (attr->group) {
461 case KVM_ARM_VCPU_PMU_V3_CTRL:
462 ret = kvm_arm_pmu_v3_get_attr(vcpu, attr);
464 case KVM_ARM_VCPU_TIMER_CTRL:
465 ret = kvm_arm_timer_get_attr(vcpu, attr);
475 int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
476 struct kvm_device_attr *attr)
480 switch (attr->group) {
481 case KVM_ARM_VCPU_PMU_V3_CTRL:
482 ret = kvm_arm_pmu_v3_has_attr(vcpu, attr);
484 case KVM_ARM_VCPU_TIMER_CTRL:
485 ret = kvm_arm_timer_has_attr(vcpu, attr);