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(hvc_exit_stat),
25 VCPU_STAT(wfe_exit_stat),
26 VCPU_STAT(wfi_exit_stat),
27 VCPU_STAT(mmio_exit_user),
28 VCPU_STAT(mmio_exit_kernel),
33 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
38 static u64 core_reg_offset_from_id(u64 id)
40 return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
43 static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
45 u32 __user *uaddr = (u32 __user *)(long)reg->addr;
46 struct kvm_regs *regs = &vcpu->arch.ctxt.gp_regs;
49 if (KVM_REG_SIZE(reg->id) != 4)
52 /* Our ID is an index into the kvm_regs struct. */
53 off = core_reg_offset_from_id(reg->id);
54 if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
57 return put_user(((u32 *)regs)[off], uaddr);
60 static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
62 u32 __user *uaddr = (u32 __user *)(long)reg->addr;
63 struct kvm_regs *regs = &vcpu->arch.ctxt.gp_regs;
66 if (KVM_REG_SIZE(reg->id) != 4)
69 /* Our ID is an index into the kvm_regs struct. */
70 off = core_reg_offset_from_id(reg->id);
71 if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
74 if (get_user(val, uaddr) != 0)
77 if (off == KVM_REG_ARM_CORE_REG(usr_regs.ARM_cpsr)) {
78 unsigned long mode = val & MODE_MASK;
92 ((u32 *)regs)[off] = val;
96 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
101 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
106 #define NUM_TIMER_REGS 3
108 static bool is_timer_reg(u64 index)
111 case KVM_REG_ARM_TIMER_CTL:
112 case KVM_REG_ARM_TIMER_CNT:
113 case KVM_REG_ARM_TIMER_CVAL:
119 static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
121 if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
124 if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
127 if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
133 static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
135 void __user *uaddr = (void __user *)(long)reg->addr;
139 ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
143 return kvm_arm_timer_set_reg(vcpu, reg->id, val);
146 static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
148 void __user *uaddr = (void __user *)(long)reg->addr;
151 val = kvm_arm_timer_get_reg(vcpu, reg->id);
152 return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0;
155 static unsigned long num_core_regs(void)
157 return sizeof(struct kvm_regs) / sizeof(u32);
161 * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
163 * This is for all registers.
165 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
167 return num_core_regs() + kvm_arm_num_coproc_regs(vcpu)
168 + kvm_arm_get_fw_num_regs(vcpu)
173 * kvm_arm_copy_reg_indices - get indices of all registers.
175 * We do core registers right here, then we append coproc regs.
177 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
180 const u64 core_reg = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_CORE;
183 for (i = 0; i < sizeof(struct kvm_regs)/sizeof(u32); i++) {
184 if (put_user(core_reg | i, uindices))
189 ret = kvm_arm_copy_fw_reg_indices(vcpu, uindices);
192 uindices += kvm_arm_get_fw_num_regs(vcpu);
194 ret = copy_timer_indices(vcpu, uindices);
197 uindices += NUM_TIMER_REGS;
199 return kvm_arm_copy_coproc_indices(vcpu, uindices);
202 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
204 /* We currently use nothing arch-specific in upper 32 bits */
205 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
208 /* Register group 16 means we want a core register. */
209 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
210 return get_core_reg(vcpu, reg);
212 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
213 return kvm_arm_get_fw_reg(vcpu, reg);
215 if (is_timer_reg(reg->id))
216 return get_timer_reg(vcpu, reg);
218 return kvm_arm_coproc_get_reg(vcpu, reg);
221 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
223 /* We currently use nothing arch-specific in upper 32 bits */
224 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
227 /* Register group 16 means we set a core register. */
228 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
229 return set_core_reg(vcpu, reg);
231 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
232 return kvm_arm_set_fw_reg(vcpu, reg);
234 if (is_timer_reg(reg->id))
235 return set_timer_reg(vcpu, reg);
237 return kvm_arm_coproc_set_reg(vcpu, reg);
240 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
241 struct kvm_sregs *sregs)
246 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
247 struct kvm_sregs *sregs)
253 int __kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
254 struct kvm_vcpu_events *events)
256 events->exception.serror_pending = !!(*vcpu_hcr(vcpu) & HCR_VA);
261 int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
262 struct kvm_vcpu_events *events)
264 bool serror_pending = events->exception.serror_pending;
265 bool has_esr = events->exception.serror_has_esr;
267 if (serror_pending && has_esr)
269 else if (serror_pending)
270 kvm_inject_vabt(vcpu);
275 int __attribute_const__ kvm_target_cpu(void)
277 switch (read_cpuid_part()) {
278 case ARM_CPU_PART_CORTEX_A7:
279 return KVM_ARM_TARGET_CORTEX_A7;
280 case ARM_CPU_PART_CORTEX_A15:
281 return KVM_ARM_TARGET_CORTEX_A15;
287 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
289 int target = kvm_target_cpu();
294 memset(init, 0, sizeof(*init));
297 * For now, we don't return any features.
298 * In future, we might use features to return target
299 * specific features available for the preferred
302 init->target = (__u32)target;
307 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
312 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
317 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
318 struct kvm_translation *tr)
323 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
324 struct kvm_guest_debug *dbg)
329 int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
330 struct kvm_device_attr *attr)
334 switch (attr->group) {
335 case KVM_ARM_VCPU_TIMER_CTRL:
336 ret = kvm_arm_timer_set_attr(vcpu, attr);
346 int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
347 struct kvm_device_attr *attr)
351 switch (attr->group) {
352 case KVM_ARM_VCPU_TIMER_CTRL:
353 ret = kvm_arm_timer_get_attr(vcpu, attr);
363 int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
364 struct kvm_device_attr *attr)
368 switch (attr->group) {
369 case KVM_ARM_VCPU_TIMER_CTRL:
370 ret = kvm_arm_timer_has_attr(vcpu, attr);