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 <asm/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 validate_core_offset(const struct kvm_one_reg *reg)
62 u64 off = core_reg_offset_from_id(reg->id);
66 case KVM_REG_ARM_CORE_REG(regs.regs[0]) ...
67 KVM_REG_ARM_CORE_REG(regs.regs[30]):
68 case KVM_REG_ARM_CORE_REG(regs.sp):
69 case KVM_REG_ARM_CORE_REG(regs.pc):
70 case KVM_REG_ARM_CORE_REG(regs.pstate):
71 case KVM_REG_ARM_CORE_REG(sp_el1):
72 case KVM_REG_ARM_CORE_REG(elr_el1):
73 case KVM_REG_ARM_CORE_REG(spsr[0]) ...
74 KVM_REG_ARM_CORE_REG(spsr[KVM_NR_SPSR - 1]):
78 case KVM_REG_ARM_CORE_REG(fp_regs.vregs[0]) ...
79 KVM_REG_ARM_CORE_REG(fp_regs.vregs[31]):
80 size = sizeof(__uint128_t);
83 case KVM_REG_ARM_CORE_REG(fp_regs.fpsr):
84 case KVM_REG_ARM_CORE_REG(fp_regs.fpcr):
92 if (KVM_REG_SIZE(reg->id) == size &&
93 IS_ALIGNED(off, size / sizeof(__u32)))
99 static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
102 * Because the kvm_regs structure is a mix of 32, 64 and
103 * 128bit fields, we index it as if it was a 32bit
104 * array. Hence below, nr_regs is the number of entries, and
105 * off the index in the "array".
107 __u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
108 struct kvm_regs *regs = vcpu_gp_regs(vcpu);
109 int nr_regs = sizeof(*regs) / sizeof(__u32);
112 /* Our ID is an index into the kvm_regs struct. */
113 off = core_reg_offset_from_id(reg->id);
114 if (off >= nr_regs ||
115 (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
118 if (validate_core_offset(reg))
121 if (copy_to_user(uaddr, ((u32 *)regs) + off, KVM_REG_SIZE(reg->id)))
127 static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
129 __u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
130 struct kvm_regs *regs = vcpu_gp_regs(vcpu);
131 int nr_regs = sizeof(*regs) / sizeof(__u32);
137 /* Our ID is an index into the kvm_regs struct. */
138 off = core_reg_offset_from_id(reg->id);
139 if (off >= nr_regs ||
140 (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
143 if (validate_core_offset(reg))
146 if (KVM_REG_SIZE(reg->id) > sizeof(tmp))
149 if (copy_from_user(valp, uaddr, KVM_REG_SIZE(reg->id))) {
154 if (off == KVM_REG_ARM_CORE_REG(regs.pstate)) {
155 u64 mode = (*(u64 *)valp) & COMPAT_PSR_MODE_MASK;
157 case COMPAT_PSR_MODE_USR:
158 if (!system_supports_32bit_el0())
161 case COMPAT_PSR_MODE_FIQ:
162 case COMPAT_PSR_MODE_IRQ:
163 case COMPAT_PSR_MODE_SVC:
164 case COMPAT_PSR_MODE_ABT:
165 case COMPAT_PSR_MODE_UND:
166 if (!vcpu_el1_is_32bit(vcpu))
172 if (vcpu_el1_is_32bit(vcpu))
181 memcpy((u32 *)regs + off, valp, KVM_REG_SIZE(reg->id));
186 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
191 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
196 static unsigned long num_core_regs(void)
198 return sizeof(struct kvm_regs) / sizeof(__u32);
202 * ARM64 versions of the TIMER registers, always available on arm64
205 #define NUM_TIMER_REGS 3
207 static bool is_timer_reg(u64 index)
210 case KVM_REG_ARM_TIMER_CTL:
211 case KVM_REG_ARM_TIMER_CNT:
212 case KVM_REG_ARM_TIMER_CVAL:
218 static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
220 if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
223 if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
226 if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
232 static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
234 void __user *uaddr = (void __user *)(long)reg->addr;
238 ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
242 return kvm_arm_timer_set_reg(vcpu, reg->id, val);
245 static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
247 void __user *uaddr = (void __user *)(long)reg->addr;
250 val = kvm_arm_timer_get_reg(vcpu, reg->id);
251 return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0;
255 * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
257 * This is for all registers.
259 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
261 return num_core_regs() + kvm_arm_num_sys_reg_descs(vcpu)
262 + kvm_arm_get_fw_num_regs(vcpu) + NUM_TIMER_REGS;
266 * kvm_arm_copy_reg_indices - get indices of all registers.
268 * We do core registers right here, then we append system regs.
270 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
273 const u64 core_reg = KVM_REG_ARM64 | KVM_REG_SIZE_U64 | KVM_REG_ARM_CORE;
276 for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) {
277 if (put_user(core_reg | i, uindices))
282 ret = kvm_arm_copy_fw_reg_indices(vcpu, uindices);
285 uindices += kvm_arm_get_fw_num_regs(vcpu);
287 ret = copy_timer_indices(vcpu, uindices);
290 uindices += NUM_TIMER_REGS;
292 return kvm_arm_copy_sys_reg_indices(vcpu, uindices);
295 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
297 /* We currently use nothing arch-specific in upper 32 bits */
298 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
301 /* Register group 16 means we want a core register. */
302 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
303 return get_core_reg(vcpu, reg);
305 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
306 return kvm_arm_get_fw_reg(vcpu, reg);
308 if (is_timer_reg(reg->id))
309 return get_timer_reg(vcpu, reg);
311 return kvm_arm_sys_reg_get_reg(vcpu, reg);
314 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
316 /* We currently use nothing arch-specific in upper 32 bits */
317 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
320 /* Register group 16 means we set a core register. */
321 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
322 return set_core_reg(vcpu, reg);
324 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
325 return kvm_arm_set_fw_reg(vcpu, reg);
327 if (is_timer_reg(reg->id))
328 return set_timer_reg(vcpu, reg);
330 return kvm_arm_sys_reg_set_reg(vcpu, reg);
333 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
334 struct kvm_sregs *sregs)
339 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
340 struct kvm_sregs *sregs)
345 int __attribute_const__ kvm_target_cpu(void)
347 unsigned long implementor = read_cpuid_implementor();
348 unsigned long part_number = read_cpuid_part_number();
350 switch (implementor) {
351 case ARM_CPU_IMP_ARM:
352 switch (part_number) {
353 case ARM_CPU_PART_AEM_V8:
354 return KVM_ARM_TARGET_AEM_V8;
355 case ARM_CPU_PART_FOUNDATION:
356 return KVM_ARM_TARGET_FOUNDATION_V8;
357 case ARM_CPU_PART_CORTEX_A53:
358 return KVM_ARM_TARGET_CORTEX_A53;
359 case ARM_CPU_PART_CORTEX_A57:
360 return KVM_ARM_TARGET_CORTEX_A57;
363 case ARM_CPU_IMP_APM:
364 switch (part_number) {
365 case APM_CPU_PART_POTENZA:
366 return KVM_ARM_TARGET_XGENE_POTENZA;
371 /* Return a default generic target */
372 return KVM_ARM_TARGET_GENERIC_V8;
375 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
377 int target = kvm_target_cpu();
382 memset(init, 0, sizeof(*init));
385 * For now, we don't return any features.
386 * In future, we might use features to return target
387 * specific features available for the preferred
390 init->target = (__u32)target;
395 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
400 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
405 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
406 struct kvm_translation *tr)
411 #define KVM_GUESTDBG_VALID_MASK (KVM_GUESTDBG_ENABLE | \
412 KVM_GUESTDBG_USE_SW_BP | \
413 KVM_GUESTDBG_USE_HW | \
414 KVM_GUESTDBG_SINGLESTEP)
417 * kvm_arch_vcpu_ioctl_set_guest_debug - set up guest debugging
418 * @kvm: pointer to the KVM struct
419 * @kvm_guest_debug: the ioctl data buffer
421 * This sets up and enables the VM for guest debugging. Userspace
422 * passes in a control flag to enable different debug types and
423 * potentially other architecture specific information in the rest of
426 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
427 struct kvm_guest_debug *dbg)
429 trace_kvm_set_guest_debug(vcpu, dbg->control);
431 if (dbg->control & ~KVM_GUESTDBG_VALID_MASK)
434 if (dbg->control & KVM_GUESTDBG_ENABLE) {
435 vcpu->guest_debug = dbg->control;
437 /* Hardware assisted Break and Watch points */
438 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW) {
439 vcpu->arch.external_debug_state = dbg->arch;
443 /* If not enabled clear all flags */
444 vcpu->guest_debug = 0;
449 int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
450 struct kvm_device_attr *attr)
454 switch (attr->group) {
455 case KVM_ARM_VCPU_PMU_V3_CTRL:
456 ret = kvm_arm_pmu_v3_set_attr(vcpu, attr);
466 int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
467 struct kvm_device_attr *attr)
471 switch (attr->group) {
472 case KVM_ARM_VCPU_PMU_V3_CTRL:
473 ret = kvm_arm_pmu_v3_get_attr(vcpu, attr);
483 int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
484 struct kvm_device_attr *attr)
488 switch (attr->group) {
489 case KVM_ARM_VCPU_PMU_V3_CTRL:
490 ret = kvm_arm_pmu_v3_has_attr(vcpu, attr);