2 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
3 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2, as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19 #include <linux/errno.h>
20 #include <linux/err.h>
21 #include <linux/kvm_host.h>
22 #include <linux/module.h>
23 #include <linux/vmalloc.h>
25 #include <asm/cputype.h>
26 #include <asm/uaccess.h>
28 #include <asm/kvm_asm.h>
29 #include <asm/kvm_emulate.h>
30 #include <asm/kvm_coproc.h>
32 #define VM_STAT(x) { #x, offsetof(struct kvm, stat.x), KVM_STAT_VM }
33 #define VCPU_STAT(x) { #x, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU }
35 struct kvm_stats_debugfs_item debugfs_entries[] = {
39 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
41 vcpu->arch.hcr = HCR_GUEST_MASK;
45 static u64 core_reg_offset_from_id(u64 id)
47 return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
50 static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
52 u32 __user *uaddr = (u32 __user *)(long)reg->addr;
53 struct kvm_regs *regs = &vcpu->arch.regs;
56 if (KVM_REG_SIZE(reg->id) != 4)
59 /* Our ID is an index into the kvm_regs struct. */
60 off = core_reg_offset_from_id(reg->id);
61 if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
64 return put_user(((u32 *)regs)[off], uaddr);
67 static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
69 u32 __user *uaddr = (u32 __user *)(long)reg->addr;
70 struct kvm_regs *regs = &vcpu->arch.regs;
73 if (KVM_REG_SIZE(reg->id) != 4)
76 /* Our ID is an index into the kvm_regs struct. */
77 off = core_reg_offset_from_id(reg->id);
78 if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
81 if (get_user(val, uaddr) != 0)
84 if (off == KVM_REG_ARM_CORE_REG(usr_regs.ARM_cpsr)) {
85 unsigned long mode = val & MODE_MASK;
99 ((u32 *)regs)[off] = val;
103 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
108 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
113 #ifndef CONFIG_KVM_ARM_TIMER
115 #define NUM_TIMER_REGS 0
117 static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
122 static bool is_timer_reg(u64 index)
127 int kvm_arm_timer_set_reg(struct kvm_vcpu *vcpu, u64 regid, u64 value)
132 u64 kvm_arm_timer_get_reg(struct kvm_vcpu *vcpu, u64 regid)
139 #define NUM_TIMER_REGS 3
141 static bool is_timer_reg(u64 index)
144 case KVM_REG_ARM_TIMER_CTL:
145 case KVM_REG_ARM_TIMER_CNT:
146 case KVM_REG_ARM_TIMER_CVAL:
152 static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
154 if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
157 if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
160 if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
168 static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
170 void __user *uaddr = (void __user *)(long)reg->addr;
174 ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
178 return kvm_arm_timer_set_reg(vcpu, reg->id, val);
181 static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
183 void __user *uaddr = (void __user *)(long)reg->addr;
186 val = kvm_arm_timer_get_reg(vcpu, reg->id);
187 return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id));
190 static unsigned long num_core_regs(void)
192 return sizeof(struct kvm_regs) / sizeof(u32);
196 * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
198 * This is for all registers.
200 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
202 return num_core_regs() + kvm_arm_num_coproc_regs(vcpu)
207 * kvm_arm_copy_reg_indices - get indices of all registers.
209 * We do core registers right here, then we apppend coproc regs.
211 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
214 const u64 core_reg = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_CORE;
217 for (i = 0; i < sizeof(struct kvm_regs)/sizeof(u32); i++) {
218 if (put_user(core_reg | i, uindices))
223 ret = copy_timer_indices(vcpu, uindices);
226 uindices += NUM_TIMER_REGS;
228 return kvm_arm_copy_coproc_indices(vcpu, uindices);
231 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
233 /* We currently use nothing arch-specific in upper 32 bits */
234 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
237 /* Register group 16 means we want a core register. */
238 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
239 return get_core_reg(vcpu, reg);
241 if (is_timer_reg(reg->id))
242 return get_timer_reg(vcpu, reg);
244 return kvm_arm_coproc_get_reg(vcpu, reg);
247 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
249 /* We currently use nothing arch-specific in upper 32 bits */
250 if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
253 /* Register group 16 means we set a core register. */
254 if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
255 return set_core_reg(vcpu, reg);
257 if (is_timer_reg(reg->id))
258 return set_timer_reg(vcpu, reg);
260 return kvm_arm_coproc_set_reg(vcpu, reg);
263 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
264 struct kvm_sregs *sregs)
269 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
270 struct kvm_sregs *sregs)
275 int __attribute_const__ kvm_target_cpu(void)
277 unsigned long implementor = read_cpuid_implementor();
278 unsigned long part_number = read_cpuid_part_number();
280 if (implementor != ARM_CPU_IMP_ARM)
283 switch (part_number) {
284 case ARM_CPU_PART_CORTEX_A7:
285 return KVM_ARM_TARGET_CORTEX_A7;
286 case ARM_CPU_PART_CORTEX_A15:
287 return KVM_ARM_TARGET_CORTEX_A15;
293 int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
294 const struct kvm_vcpu_init *init)
298 /* We can only cope with guest==host and only on A15/A7 (for now). */
299 if (init->target != kvm_target_cpu())
302 vcpu->arch.target = init->target;
303 bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
305 /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
306 for (i = 0; i < sizeof(init->features) * 8; i++) {
307 if (test_bit(i, (void *)init->features)) {
308 if (i >= KVM_VCPU_MAX_FEATURES)
310 set_bit(i, vcpu->arch.features);
314 /* Now we know what it is, we can reset it. */
315 return kvm_reset_vcpu(vcpu);
318 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
320 int target = kvm_target_cpu();
325 memset(init, 0, sizeof(*init));
328 * For now, we don't return any features.
329 * In future, we might use features to return target
330 * specific features available for the preferred
333 init->target = (__u32)target;
338 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
343 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
348 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
349 struct kvm_translation *tr)