1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
4 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
7 #include <linux/errno.h>
9 #include <linux/kvm_host.h>
10 #include <linux/module.h>
11 #include <linux/vmalloc.h>
13 #include <kvm/arm_psci.h>
14 #include <asm/cputype.h>
15 #include <linux/uaccess.h>
17 #include <asm/kvm_emulate.h>
18 #include <asm/kvm_coproc.h>
20 #define VM_STAT(x) { #x, offsetof(struct kvm, stat.x), KVM_STAT_VM }
21 #define VCPU_STAT(x) { #x, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU }
23 struct kvm_stats_debugfs_item debugfs_entries[] = {
24 VCPU_STAT(halt_successful_poll),
25 VCPU_STAT(halt_attempted_poll),
26 VCPU_STAT(halt_poll_invalid),
27 VCPU_STAT(halt_wakeup),
28 VCPU_STAT(hvc_exit_stat),
29 VCPU_STAT(wfe_exit_stat),
30 VCPU_STAT(wfi_exit_stat),
31 VCPU_STAT(mmio_exit_user),
32 VCPU_STAT(mmio_exit_kernel),
37 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
42 static u64 core_reg_offset_from_id(u64 id)
44 return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
47 static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
49 u32 __user *uaddr = (u32 __user *)(long)reg->addr;
50 struct kvm_regs *regs = &vcpu->arch.ctxt.gp_regs;
53 if (KVM_REG_SIZE(reg->id) != 4)
56 /* Our ID is an index into the kvm_regs struct. */
57 off = core_reg_offset_from_id(reg->id);
58 if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
61 return put_user(((u32 *)regs)[off], uaddr);
64 static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
66 u32 __user *uaddr = (u32 __user *)(long)reg->addr;
67 struct kvm_regs *regs = &vcpu->arch.ctxt.gp_regs;
70 if (KVM_REG_SIZE(reg->id) != 4)
73 /* Our ID is an index into the kvm_regs struct. */
74 off = core_reg_offset_from_id(reg->id);
75 if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
78 if (get_user(val, uaddr) != 0)
81 if (off == KVM_REG_ARM_CORE_REG(usr_regs.ARM_cpsr)) {
82 unsigned long mode = val & MODE_MASK;
96 ((u32 *)regs)[off] = val;
100 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
105 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
110 #define NUM_TIMER_REGS 3
112 static bool is_timer_reg(u64 index)
115 case KVM_REG_ARM_TIMER_CTL:
116 case KVM_REG_ARM_TIMER_CNT:
117 case KVM_REG_ARM_TIMER_CVAL:
123 static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
125 if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
128 if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
131 if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
137 static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
139 void __user *uaddr = (void __user *)(long)reg->addr;
143 ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
147 return kvm_arm_timer_set_reg(vcpu, reg->id, val);
150 static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
152 void __user *uaddr = (void __user *)(long)reg->addr;
155 val = kvm_arm_timer_get_reg(vcpu, reg->id);
156 return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0;
159 static unsigned long num_core_regs(void)
161 return sizeof(struct kvm_regs) / sizeof(u32);
165 * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
167 * This is for all registers.
169 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
171 return num_core_regs() + kvm_arm_num_coproc_regs(vcpu)
172 + kvm_arm_get_fw_num_regs(vcpu)
177 * kvm_arm_copy_reg_indices - get indices of all registers.
179 * We do core registers right here, then we append coproc regs.
181 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
184 const u64 core_reg = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_CORE;
187 for (i = 0; i < sizeof(struct kvm_regs)/sizeof(u32); i++) {
188 if (put_user(core_reg | i, uindices))
193 ret = kvm_arm_copy_fw_reg_indices(vcpu, uindices);
196 uindices += kvm_arm_get_fw_num_regs(vcpu);
198 ret = copy_timer_indices(vcpu, uindices);
201 uindices += NUM_TIMER_REGS;
203 return kvm_arm_copy_coproc_indices(vcpu, uindices);
206 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
208 /* We currently use nothing arch-specific in upper 32 bits */
209 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
212 /* Register group 16 means we want a core register. */
213 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
214 return get_core_reg(vcpu, reg);
216 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
217 return kvm_arm_get_fw_reg(vcpu, reg);
219 if (is_timer_reg(reg->id))
220 return get_timer_reg(vcpu, reg);
222 return kvm_arm_coproc_get_reg(vcpu, reg);
225 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
227 /* We currently use nothing arch-specific in upper 32 bits */
228 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
231 /* Register group 16 means we set a core register. */
232 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
233 return set_core_reg(vcpu, reg);
235 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
236 return kvm_arm_set_fw_reg(vcpu, reg);
238 if (is_timer_reg(reg->id))
239 return set_timer_reg(vcpu, reg);
241 return kvm_arm_coproc_set_reg(vcpu, reg);
244 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
245 struct kvm_sregs *sregs)
250 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
251 struct kvm_sregs *sregs)
257 int __kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
258 struct kvm_vcpu_events *events)
260 events->exception.serror_pending = !!(*vcpu_hcr(vcpu) & HCR_VA);
263 * We never return a pending ext_dabt here because we deliver it to
264 * the virtual CPU directly when setting the event and it's no longer
265 * 'pending' at this point.
271 int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
272 struct kvm_vcpu_events *events)
274 bool serror_pending = events->exception.serror_pending;
275 bool has_esr = events->exception.serror_has_esr;
276 bool ext_dabt_pending = events->exception.ext_dabt_pending;
278 if (serror_pending && has_esr)
280 else if (serror_pending)
281 kvm_inject_vabt(vcpu);
283 if (ext_dabt_pending)
284 kvm_inject_dabt(vcpu, kvm_vcpu_get_hfar(vcpu));
289 int __attribute_const__ kvm_target_cpu(void)
291 switch (read_cpuid_part()) {
292 case ARM_CPU_PART_CORTEX_A7:
293 return KVM_ARM_TARGET_CORTEX_A7;
294 case ARM_CPU_PART_CORTEX_A15:
295 return KVM_ARM_TARGET_CORTEX_A15;
301 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
303 int target = kvm_target_cpu();
308 memset(init, 0, sizeof(*init));
311 * For now, we don't return any features.
312 * In future, we might use features to return target
313 * specific features available for the preferred
316 init->target = (__u32)target;
321 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
326 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
331 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
332 struct kvm_translation *tr)
337 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
338 struct kvm_guest_debug *dbg)
343 int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
344 struct kvm_device_attr *attr)
348 switch (attr->group) {
349 case KVM_ARM_VCPU_TIMER_CTRL:
350 ret = kvm_arm_timer_set_attr(vcpu, attr);
360 int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
361 struct kvm_device_attr *attr)
365 switch (attr->group) {
366 case KVM_ARM_VCPU_TIMER_CTRL:
367 ret = kvm_arm_timer_get_attr(vcpu, attr);
377 int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
378 struct kvm_device_attr *attr)
382 switch (attr->group) {
383 case KVM_ARM_VCPU_TIMER_CTRL:
384 ret = kvm_arm_timer_has_attr(vcpu, attr);