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/string.h>
27 #include <linux/vmalloc.h>
29 #include <kvm/arm_psci.h>
30 #include <asm/cputype.h>
31 #include <linux/uaccess.h>
33 #include <asm/kvm_emulate.h>
34 #include <asm/kvm_coproc.h>
38 #define VM_STAT(x) { #x, offsetof(struct kvm, stat.x), KVM_STAT_VM }
39 #define VCPU_STAT(x) { #x, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU }
41 struct kvm_stats_debugfs_item debugfs_entries[] = {
42 VCPU_STAT(hvc_exit_stat),
43 VCPU_STAT(wfe_exit_stat),
44 VCPU_STAT(wfi_exit_stat),
45 VCPU_STAT(mmio_exit_user),
46 VCPU_STAT(mmio_exit_kernel),
51 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
56 static u64 core_reg_offset_from_id(u64 id)
58 return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
61 static int validate_core_offset(const struct kvm_one_reg *reg)
63 u64 off = core_reg_offset_from_id(reg->id);
67 case KVM_REG_ARM_CORE_REG(regs.regs[0]) ...
68 KVM_REG_ARM_CORE_REG(regs.regs[30]):
69 case KVM_REG_ARM_CORE_REG(regs.sp):
70 case KVM_REG_ARM_CORE_REG(regs.pc):
71 case KVM_REG_ARM_CORE_REG(regs.pstate):
72 case KVM_REG_ARM_CORE_REG(sp_el1):
73 case KVM_REG_ARM_CORE_REG(elr_el1):
74 case KVM_REG_ARM_CORE_REG(spsr[0]) ...
75 KVM_REG_ARM_CORE_REG(spsr[KVM_NR_SPSR - 1]):
79 case KVM_REG_ARM_CORE_REG(fp_regs.vregs[0]) ...
80 KVM_REG_ARM_CORE_REG(fp_regs.vregs[31]):
81 size = sizeof(__uint128_t);
84 case KVM_REG_ARM_CORE_REG(fp_regs.fpsr):
85 case KVM_REG_ARM_CORE_REG(fp_regs.fpcr):
93 if (KVM_REG_SIZE(reg->id) == size &&
94 IS_ALIGNED(off, size / sizeof(__u32)))
100 static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
103 * Because the kvm_regs structure is a mix of 32, 64 and
104 * 128bit fields, we index it as if it was a 32bit
105 * array. Hence below, nr_regs is the number of entries, and
106 * off the index in the "array".
108 __u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
109 struct kvm_regs *regs = vcpu_gp_regs(vcpu);
110 int nr_regs = sizeof(*regs) / sizeof(__u32);
113 /* Our ID is an index into the kvm_regs struct. */
114 off = core_reg_offset_from_id(reg->id);
115 if (off >= nr_regs ||
116 (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
119 if (validate_core_offset(reg))
122 if (copy_to_user(uaddr, ((u32 *)regs) + off, KVM_REG_SIZE(reg->id)))
128 static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
130 __u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
131 struct kvm_regs *regs = vcpu_gp_regs(vcpu);
132 int nr_regs = sizeof(*regs) / sizeof(__u32);
138 /* Our ID is an index into the kvm_regs struct. */
139 off = core_reg_offset_from_id(reg->id);
140 if (off >= nr_regs ||
141 (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
144 if (validate_core_offset(reg))
147 if (KVM_REG_SIZE(reg->id) > sizeof(tmp))
150 if (copy_from_user(valp, uaddr, KVM_REG_SIZE(reg->id))) {
155 if (off == KVM_REG_ARM_CORE_REG(regs.pstate)) {
156 u64 mode = (*(u64 *)valp) & PSR_AA32_MODE_MASK;
158 case PSR_AA32_MODE_USR:
159 if (!system_supports_32bit_el0())
162 case PSR_AA32_MODE_FIQ:
163 case PSR_AA32_MODE_IRQ:
164 case PSR_AA32_MODE_SVC:
165 case PSR_AA32_MODE_ABT:
166 case PSR_AA32_MODE_UND:
167 if (!vcpu_el1_is_32bit(vcpu))
173 if (vcpu_el1_is_32bit(vcpu))
182 memcpy((u32 *)regs + off, valp, KVM_REG_SIZE(reg->id));
187 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
192 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
197 static unsigned long num_core_regs(void)
199 return sizeof(struct kvm_regs) / sizeof(__u32);
203 * ARM64 versions of the TIMER registers, always available on arm64
206 #define NUM_TIMER_REGS 3
208 static bool is_timer_reg(u64 index)
211 case KVM_REG_ARM_TIMER_CTL:
212 case KVM_REG_ARM_TIMER_CNT:
213 case KVM_REG_ARM_TIMER_CVAL:
219 static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
221 if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
224 if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
227 if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
233 static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
235 void __user *uaddr = (void __user *)(long)reg->addr;
239 ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
243 return kvm_arm_timer_set_reg(vcpu, reg->id, val);
246 static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
248 void __user *uaddr = (void __user *)(long)reg->addr;
251 val = kvm_arm_timer_get_reg(vcpu, reg->id);
252 return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0;
256 * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
258 * This is for all registers.
260 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
262 unsigned long res = 0;
264 res += num_core_regs();
265 res += kvm_arm_num_sys_reg_descs(vcpu);
266 res += kvm_arm_get_fw_num_regs(vcpu);
267 res += NUM_TIMER_REGS;
273 * kvm_arm_copy_reg_indices - get indices of all registers.
275 * We do core registers right here, then we append system regs.
277 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
280 const u64 core_reg = KVM_REG_ARM64 | KVM_REG_SIZE_U64 | KVM_REG_ARM_CORE;
283 for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) {
284 if (put_user(core_reg | i, uindices))
289 ret = kvm_arm_copy_fw_reg_indices(vcpu, uindices);
292 uindices += kvm_arm_get_fw_num_regs(vcpu);
294 ret = copy_timer_indices(vcpu, uindices);
297 uindices += NUM_TIMER_REGS;
299 return kvm_arm_copy_sys_reg_indices(vcpu, uindices);
302 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
304 /* We currently use nothing arch-specific in upper 32 bits */
305 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
308 /* Register group 16 means we want a core register. */
309 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
310 return get_core_reg(vcpu, reg);
312 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
313 return kvm_arm_get_fw_reg(vcpu, reg);
315 if (is_timer_reg(reg->id))
316 return get_timer_reg(vcpu, reg);
318 return kvm_arm_sys_reg_get_reg(vcpu, reg);
321 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
323 /* We currently use nothing arch-specific in upper 32 bits */
324 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
327 /* Register group 16 means we set a core register. */
328 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
329 return set_core_reg(vcpu, reg);
331 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
332 return kvm_arm_set_fw_reg(vcpu, reg);
334 if (is_timer_reg(reg->id))
335 return set_timer_reg(vcpu, reg);
337 return kvm_arm_sys_reg_set_reg(vcpu, reg);
340 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
341 struct kvm_sregs *sregs)
346 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
347 struct kvm_sregs *sregs)
352 int __kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
353 struct kvm_vcpu_events *events)
355 events->exception.serror_pending = !!(vcpu->arch.hcr_el2 & HCR_VSE);
356 events->exception.serror_has_esr = cpus_have_const_cap(ARM64_HAS_RAS_EXTN);
358 if (events->exception.serror_pending && events->exception.serror_has_esr)
359 events->exception.serror_esr = vcpu_get_vsesr(vcpu);
364 int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
365 struct kvm_vcpu_events *events)
367 bool serror_pending = events->exception.serror_pending;
368 bool has_esr = events->exception.serror_has_esr;
370 if (serror_pending && has_esr) {
371 if (!cpus_have_const_cap(ARM64_HAS_RAS_EXTN))
374 if (!((events->exception.serror_esr) & ~ESR_ELx_ISS_MASK))
375 kvm_set_sei_esr(vcpu, events->exception.serror_esr);
378 } else if (serror_pending) {
379 kvm_inject_vabt(vcpu);
385 int __attribute_const__ kvm_target_cpu(void)
387 unsigned long implementor = read_cpuid_implementor();
388 unsigned long part_number = read_cpuid_part_number();
390 switch (implementor) {
391 case ARM_CPU_IMP_ARM:
392 switch (part_number) {
393 case ARM_CPU_PART_AEM_V8:
394 return KVM_ARM_TARGET_AEM_V8;
395 case ARM_CPU_PART_FOUNDATION:
396 return KVM_ARM_TARGET_FOUNDATION_V8;
397 case ARM_CPU_PART_CORTEX_A53:
398 return KVM_ARM_TARGET_CORTEX_A53;
399 case ARM_CPU_PART_CORTEX_A57:
400 return KVM_ARM_TARGET_CORTEX_A57;
403 case ARM_CPU_IMP_APM:
404 switch (part_number) {
405 case APM_CPU_PART_POTENZA:
406 return KVM_ARM_TARGET_XGENE_POTENZA;
411 /* Return a default generic target */
412 return KVM_ARM_TARGET_GENERIC_V8;
415 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
417 int target = kvm_target_cpu();
422 memset(init, 0, sizeof(*init));
425 * For now, we don't return any features.
426 * In future, we might use features to return target
427 * specific features available for the preferred
430 init->target = (__u32)target;
435 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
440 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
445 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
446 struct kvm_translation *tr)
451 #define KVM_GUESTDBG_VALID_MASK (KVM_GUESTDBG_ENABLE | \
452 KVM_GUESTDBG_USE_SW_BP | \
453 KVM_GUESTDBG_USE_HW | \
454 KVM_GUESTDBG_SINGLESTEP)
457 * kvm_arch_vcpu_ioctl_set_guest_debug - set up guest debugging
458 * @kvm: pointer to the KVM struct
459 * @kvm_guest_debug: the ioctl data buffer
461 * This sets up and enables the VM for guest debugging. Userspace
462 * passes in a control flag to enable different debug types and
463 * potentially other architecture specific information in the rest of
466 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
467 struct kvm_guest_debug *dbg)
471 trace_kvm_set_guest_debug(vcpu, dbg->control);
473 if (dbg->control & ~KVM_GUESTDBG_VALID_MASK) {
478 if (dbg->control & KVM_GUESTDBG_ENABLE) {
479 vcpu->guest_debug = dbg->control;
481 /* Hardware assisted Break and Watch points */
482 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW) {
483 vcpu->arch.external_debug_state = dbg->arch;
487 /* If not enabled clear all flags */
488 vcpu->guest_debug = 0;
495 int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
496 struct kvm_device_attr *attr)
500 switch (attr->group) {
501 case KVM_ARM_VCPU_PMU_V3_CTRL:
502 ret = kvm_arm_pmu_v3_set_attr(vcpu, attr);
504 case KVM_ARM_VCPU_TIMER_CTRL:
505 ret = kvm_arm_timer_set_attr(vcpu, attr);
515 int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
516 struct kvm_device_attr *attr)
520 switch (attr->group) {
521 case KVM_ARM_VCPU_PMU_V3_CTRL:
522 ret = kvm_arm_pmu_v3_get_attr(vcpu, attr);
524 case KVM_ARM_VCPU_TIMER_CTRL:
525 ret = kvm_arm_timer_get_attr(vcpu, attr);
535 int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
536 struct kvm_device_attr *attr)
540 switch (attr->group) {
541 case KVM_ARM_VCPU_PMU_V3_CTRL:
542 ret = kvm_arm_pmu_v3_has_attr(vcpu, attr);
544 case KVM_ARM_VCPU_TIMER_CTRL:
545 ret = kvm_arm_timer_has_attr(vcpu, attr);