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_asm.h>
32 #include <asm/kvm_emulate.h>
33 #include <asm/kvm_coproc.h>
37 struct kvm_stats_debugfs_item debugfs_entries[] = {
41 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
46 static u64 core_reg_offset_from_id(u64 id)
48 return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
51 static int validate_core_offset(const struct kvm_one_reg *reg)
53 u64 off = core_reg_offset_from_id(reg->id);
57 case KVM_REG_ARM_CORE_REG(regs.regs[0]) ...
58 KVM_REG_ARM_CORE_REG(regs.regs[30]):
59 case KVM_REG_ARM_CORE_REG(regs.sp):
60 case KVM_REG_ARM_CORE_REG(regs.pc):
61 case KVM_REG_ARM_CORE_REG(regs.pstate):
62 case KVM_REG_ARM_CORE_REG(sp_el1):
63 case KVM_REG_ARM_CORE_REG(elr_el1):
64 case KVM_REG_ARM_CORE_REG(spsr[0]) ...
65 KVM_REG_ARM_CORE_REG(spsr[KVM_NR_SPSR - 1]):
69 case KVM_REG_ARM_CORE_REG(fp_regs.vregs[0]) ...
70 KVM_REG_ARM_CORE_REG(fp_regs.vregs[31]):
71 size = sizeof(__uint128_t);
74 case KVM_REG_ARM_CORE_REG(fp_regs.fpsr):
75 case KVM_REG_ARM_CORE_REG(fp_regs.fpcr):
83 if (KVM_REG_SIZE(reg->id) == size &&
84 IS_ALIGNED(off, size / sizeof(__u32)))
90 static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
93 * Because the kvm_regs structure is a mix of 32, 64 and
94 * 128bit fields, we index it as if it was a 32bit
95 * array. Hence below, nr_regs is the number of entries, and
96 * off the index in the "array".
98 __u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
99 struct kvm_regs *regs = vcpu_gp_regs(vcpu);
100 int nr_regs = sizeof(*regs) / sizeof(__u32);
103 /* Our ID is an index into the kvm_regs struct. */
104 off = core_reg_offset_from_id(reg->id);
105 if (off >= nr_regs ||
106 (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
109 if (validate_core_offset(reg))
112 if (copy_to_user(uaddr, ((u32 *)regs) + off, KVM_REG_SIZE(reg->id)))
118 static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
120 __u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
121 struct kvm_regs *regs = vcpu_gp_regs(vcpu);
122 int nr_regs = sizeof(*regs) / sizeof(__u32);
128 /* Our ID is an index into the kvm_regs struct. */
129 off = core_reg_offset_from_id(reg->id);
130 if (off >= nr_regs ||
131 (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
134 if (validate_core_offset(reg))
137 if (KVM_REG_SIZE(reg->id) > sizeof(tmp))
140 if (copy_from_user(valp, uaddr, KVM_REG_SIZE(reg->id))) {
145 if (off == KVM_REG_ARM_CORE_REG(regs.pstate)) {
146 u64 mode = (*(u64 *)valp) & COMPAT_PSR_MODE_MASK;
148 case COMPAT_PSR_MODE_USR:
149 if (!system_supports_32bit_el0())
152 case COMPAT_PSR_MODE_FIQ:
153 case COMPAT_PSR_MODE_IRQ:
154 case COMPAT_PSR_MODE_SVC:
155 case COMPAT_PSR_MODE_ABT:
156 case COMPAT_PSR_MODE_UND:
157 if (!vcpu_el1_is_32bit(vcpu))
163 if (vcpu_el1_is_32bit(vcpu))
172 memcpy((u32 *)regs + off, valp, KVM_REG_SIZE(reg->id));
177 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
182 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
187 static unsigned long num_core_regs(void)
189 return sizeof(struct kvm_regs) / sizeof(__u32);
193 * ARM64 versions of the TIMER registers, always available on arm64
196 #define NUM_TIMER_REGS 3
198 static bool is_timer_reg(u64 index)
201 case KVM_REG_ARM_TIMER_CTL:
202 case KVM_REG_ARM_TIMER_CNT:
203 case KVM_REG_ARM_TIMER_CVAL:
209 static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
211 if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
214 if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
217 if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
223 static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
225 void __user *uaddr = (void __user *)(long)reg->addr;
229 ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
233 return kvm_arm_timer_set_reg(vcpu, reg->id, val);
236 static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
238 void __user *uaddr = (void __user *)(long)reg->addr;
241 val = kvm_arm_timer_get_reg(vcpu, reg->id);
242 return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0;
246 * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
248 * This is for all registers.
250 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
252 return num_core_regs() + kvm_arm_num_sys_reg_descs(vcpu)
257 * kvm_arm_copy_reg_indices - get indices of all registers.
259 * We do core registers right here, then we apppend system regs.
261 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
264 const u64 core_reg = KVM_REG_ARM64 | KVM_REG_SIZE_U64 | KVM_REG_ARM_CORE;
267 for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) {
268 if (put_user(core_reg | i, uindices))
273 ret = copy_timer_indices(vcpu, uindices);
276 uindices += NUM_TIMER_REGS;
278 return kvm_arm_copy_sys_reg_indices(vcpu, uindices);
281 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
283 /* We currently use nothing arch-specific in upper 32 bits */
284 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
287 /* Register group 16 means we want a core register. */
288 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
289 return get_core_reg(vcpu, reg);
291 if (is_timer_reg(reg->id))
292 return get_timer_reg(vcpu, reg);
294 return kvm_arm_sys_reg_get_reg(vcpu, reg);
297 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
299 /* We currently use nothing arch-specific in upper 32 bits */
300 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
303 /* Register group 16 means we set a core register. */
304 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
305 return set_core_reg(vcpu, reg);
307 if (is_timer_reg(reg->id))
308 return set_timer_reg(vcpu, reg);
310 return kvm_arm_sys_reg_set_reg(vcpu, reg);
313 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
314 struct kvm_sregs *sregs)
319 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
320 struct kvm_sregs *sregs)
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)
409 trace_kvm_set_guest_debug(vcpu, dbg->control);
411 if (dbg->control & ~KVM_GUESTDBG_VALID_MASK)
414 if (dbg->control & KVM_GUESTDBG_ENABLE) {
415 vcpu->guest_debug = dbg->control;
417 /* Hardware assisted Break and Watch points */
418 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW) {
419 vcpu->arch.external_debug_state = dbg->arch;
423 /* If not enabled clear all flags */
424 vcpu->guest_debug = 0;