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 core_reg_size_from_offset(u64 off)
65 case KVM_REG_ARM_CORE_REG(regs.regs[0]) ...
66 KVM_REG_ARM_CORE_REG(regs.regs[30]):
67 case KVM_REG_ARM_CORE_REG(regs.sp):
68 case KVM_REG_ARM_CORE_REG(regs.pc):
69 case KVM_REG_ARM_CORE_REG(regs.pstate):
70 case KVM_REG_ARM_CORE_REG(sp_el1):
71 case KVM_REG_ARM_CORE_REG(elr_el1):
72 case KVM_REG_ARM_CORE_REG(spsr[0]) ...
73 KVM_REG_ARM_CORE_REG(spsr[KVM_NR_SPSR - 1]):
77 case KVM_REG_ARM_CORE_REG(fp_regs.vregs[0]) ...
78 KVM_REG_ARM_CORE_REG(fp_regs.vregs[31]):
79 size = sizeof(__uint128_t);
82 case KVM_REG_ARM_CORE_REG(fp_regs.fpsr):
83 case KVM_REG_ARM_CORE_REG(fp_regs.fpcr):
91 if (!IS_ALIGNED(off, size / sizeof(__u32)))
97 static int validate_core_offset(const struct kvm_one_reg *reg)
99 u64 off = core_reg_offset_from_id(reg->id);
100 int size = core_reg_size_from_offset(off);
105 if (KVM_REG_SIZE(reg->id) != size)
111 static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
114 * Because the kvm_regs structure is a mix of 32, 64 and
115 * 128bit fields, we index it as if it was a 32bit
116 * array. Hence below, nr_regs is the number of entries, and
117 * off the index in the "array".
119 __u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
120 struct kvm_regs *regs = vcpu_gp_regs(vcpu);
121 int nr_regs = sizeof(*regs) / sizeof(__u32);
124 /* Our ID is an index into the kvm_regs struct. */
125 off = core_reg_offset_from_id(reg->id);
126 if (off >= nr_regs ||
127 (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
130 if (validate_core_offset(reg))
133 if (copy_to_user(uaddr, ((u32 *)regs) + off, KVM_REG_SIZE(reg->id)))
139 static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
141 __u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
142 struct kvm_regs *regs = vcpu_gp_regs(vcpu);
143 int nr_regs = sizeof(*regs) / sizeof(__u32);
149 /* Our ID is an index into the kvm_regs struct. */
150 off = core_reg_offset_from_id(reg->id);
151 if (off >= nr_regs ||
152 (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
155 if (validate_core_offset(reg))
158 if (KVM_REG_SIZE(reg->id) > sizeof(tmp))
161 if (copy_from_user(valp, uaddr, KVM_REG_SIZE(reg->id))) {
166 if (off == KVM_REG_ARM_CORE_REG(regs.pstate)) {
167 u64 mode = (*(u64 *)valp) & COMPAT_PSR_MODE_MASK;
169 case COMPAT_PSR_MODE_USR:
170 if (!system_supports_32bit_el0())
173 case COMPAT_PSR_MODE_FIQ:
174 case COMPAT_PSR_MODE_IRQ:
175 case COMPAT_PSR_MODE_SVC:
176 case COMPAT_PSR_MODE_ABT:
177 case COMPAT_PSR_MODE_UND:
178 if (!vcpu_el1_is_32bit(vcpu))
184 if (vcpu_el1_is_32bit(vcpu))
193 memcpy((u32 *)regs + off, valp, KVM_REG_SIZE(reg->id));
198 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
203 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
208 static int kvm_arm_copy_core_reg_indices(u64 __user *uindices)
213 for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) {
214 u64 reg = KVM_REG_ARM64 | KVM_REG_ARM_CORE | i;
215 int size = core_reg_size_from_offset(i);
222 reg |= KVM_REG_SIZE_U32;
226 reg |= KVM_REG_SIZE_U64;
229 case sizeof(__uint128_t):
230 reg |= KVM_REG_SIZE_U128;
239 if (put_user(reg, uindices))
250 static unsigned long num_core_regs(void)
252 return kvm_arm_copy_core_reg_indices(NULL);
256 * ARM64 versions of the TIMER registers, always available on arm64
259 #define NUM_TIMER_REGS 3
261 static bool is_timer_reg(u64 index)
264 case KVM_REG_ARM_TIMER_CTL:
265 case KVM_REG_ARM_TIMER_CNT:
266 case KVM_REG_ARM_TIMER_CVAL:
272 static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
274 if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
277 if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
280 if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
286 static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
288 void __user *uaddr = (void __user *)(long)reg->addr;
292 ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
296 return kvm_arm_timer_set_reg(vcpu, reg->id, val);
299 static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
301 void __user *uaddr = (void __user *)(long)reg->addr;
304 val = kvm_arm_timer_get_reg(vcpu, reg->id);
305 return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0;
309 * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
311 * This is for all registers.
313 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
315 return num_core_regs() + kvm_arm_num_sys_reg_descs(vcpu)
316 + kvm_arm_get_fw_num_regs(vcpu) + NUM_TIMER_REGS;
320 * kvm_arm_copy_reg_indices - get indices of all registers.
322 * We do core registers right here, then we append system regs.
324 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
328 ret = kvm_arm_copy_core_reg_indices(uindices);
333 ret = kvm_arm_copy_fw_reg_indices(vcpu, uindices);
336 uindices += kvm_arm_get_fw_num_regs(vcpu);
338 ret = copy_timer_indices(vcpu, uindices);
341 uindices += NUM_TIMER_REGS;
343 return kvm_arm_copy_sys_reg_indices(vcpu, uindices);
346 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
348 /* We currently use nothing arch-specific in upper 32 bits */
349 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
352 /* Register group 16 means we want a core register. */
353 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
354 return get_core_reg(vcpu, reg);
356 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
357 return kvm_arm_get_fw_reg(vcpu, reg);
359 if (is_timer_reg(reg->id))
360 return get_timer_reg(vcpu, reg);
362 return kvm_arm_sys_reg_get_reg(vcpu, reg);
365 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
367 /* We currently use nothing arch-specific in upper 32 bits */
368 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
371 /* Register group 16 means we set a core register. */
372 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
373 return set_core_reg(vcpu, reg);
375 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
376 return kvm_arm_set_fw_reg(vcpu, reg);
378 if (is_timer_reg(reg->id))
379 return set_timer_reg(vcpu, reg);
381 return kvm_arm_sys_reg_set_reg(vcpu, reg);
384 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
385 struct kvm_sregs *sregs)
390 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
391 struct kvm_sregs *sregs)
396 int __attribute_const__ kvm_target_cpu(void)
398 unsigned long implementor = read_cpuid_implementor();
399 unsigned long part_number = read_cpuid_part_number();
401 switch (implementor) {
402 case ARM_CPU_IMP_ARM:
403 switch (part_number) {
404 case ARM_CPU_PART_AEM_V8:
405 return KVM_ARM_TARGET_AEM_V8;
406 case ARM_CPU_PART_FOUNDATION:
407 return KVM_ARM_TARGET_FOUNDATION_V8;
408 case ARM_CPU_PART_CORTEX_A53:
409 return KVM_ARM_TARGET_CORTEX_A53;
410 case ARM_CPU_PART_CORTEX_A57:
411 return KVM_ARM_TARGET_CORTEX_A57;
414 case ARM_CPU_IMP_APM:
415 switch (part_number) {
416 case APM_CPU_PART_POTENZA:
417 return KVM_ARM_TARGET_XGENE_POTENZA;
422 /* Return a default generic target */
423 return KVM_ARM_TARGET_GENERIC_V8;
426 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
428 int target = kvm_target_cpu();
433 memset(init, 0, sizeof(*init));
436 * For now, we don't return any features.
437 * In future, we might use features to return target
438 * specific features available for the preferred
441 init->target = (__u32)target;
446 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
451 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
456 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
457 struct kvm_translation *tr)
462 #define KVM_GUESTDBG_VALID_MASK (KVM_GUESTDBG_ENABLE | \
463 KVM_GUESTDBG_USE_SW_BP | \
464 KVM_GUESTDBG_USE_HW | \
465 KVM_GUESTDBG_SINGLESTEP)
468 * kvm_arch_vcpu_ioctl_set_guest_debug - set up guest debugging
469 * @kvm: pointer to the KVM struct
470 * @kvm_guest_debug: the ioctl data buffer
472 * This sets up and enables the VM for guest debugging. Userspace
473 * passes in a control flag to enable different debug types and
474 * potentially other architecture specific information in the rest of
477 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
478 struct kvm_guest_debug *dbg)
480 trace_kvm_set_guest_debug(vcpu, dbg->control);
482 if (dbg->control & ~KVM_GUESTDBG_VALID_MASK)
485 if (dbg->control & KVM_GUESTDBG_ENABLE) {
486 vcpu->guest_debug = dbg->control;
488 /* Hardware assisted Break and Watch points */
489 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW) {
490 vcpu->arch.external_debug_state = dbg->arch;
494 /* If not enabled clear all flags */
495 vcpu->guest_debug = 0;
500 int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
501 struct kvm_device_attr *attr)
505 switch (attr->group) {
506 case KVM_ARM_VCPU_PMU_V3_CTRL:
507 ret = kvm_arm_pmu_v3_set_attr(vcpu, attr);
509 case KVM_ARM_VCPU_TIMER_CTRL:
510 ret = kvm_arm_timer_set_attr(vcpu, attr);
520 int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
521 struct kvm_device_attr *attr)
525 switch (attr->group) {
526 case KVM_ARM_VCPU_PMU_V3_CTRL:
527 ret = kvm_arm_pmu_v3_get_attr(vcpu, attr);
529 case KVM_ARM_VCPU_TIMER_CTRL:
530 ret = kvm_arm_timer_get_attr(vcpu, attr);
540 int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
541 struct kvm_device_attr *attr)
545 switch (attr->group) {
546 case KVM_ARM_VCPU_PMU_V3_CTRL:
547 ret = kvm_arm_pmu_v3_has_attr(vcpu, attr);
549 case KVM_ARM_VCPU_TIMER_CTRL:
550 ret = kvm_arm_timer_has_attr(vcpu, attr);