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Linux/arch/arm64/kvm/guest.c

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  1 /*
  2  * Copyright (C) 2012,2013 - ARM Ltd
  3  * Author: Marc Zyngier <marc.zyngier@arm.com>
  4  *
  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>
  8  *
  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.
 12  *
 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.
 17  *
 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/>.
 20  */
 21 
 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>
 27 #include <linux/fs.h>
 28 #include <asm/cputype.h>
 29 #include <asm/uaccess.h>
 30 #include <asm/kvm.h>
 31 #include <asm/kvm_asm.h>
 32 #include <asm/kvm_emulate.h>
 33 #include <asm/kvm_coproc.h>
 34 
 35 struct kvm_stats_debugfs_item debugfs_entries[] = {
 36         { NULL }
 37 };
 38 
 39 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 40 {
 41         vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS;
 42         return 0;
 43 }
 44 
 45 static u64 core_reg_offset_from_id(u64 id)
 46 {
 47         return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
 48 }
 49 
 50 static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 51 {
 52         /*
 53          * Because the kvm_regs structure is a mix of 32, 64 and
 54          * 128bit fields, we index it as if it was a 32bit
 55          * array. Hence below, nr_regs is the number of entries, and
 56          * off the index in the "array".
 57          */
 58         __u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
 59         struct kvm_regs *regs = vcpu_gp_regs(vcpu);
 60         int nr_regs = sizeof(*regs) / sizeof(__u32);
 61         u32 off;
 62 
 63         /* Our ID is an index into the kvm_regs struct. */
 64         off = core_reg_offset_from_id(reg->id);
 65         if (off >= nr_regs ||
 66             (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
 67                 return -ENOENT;
 68 
 69         if (copy_to_user(uaddr, ((u32 *)regs) + off, KVM_REG_SIZE(reg->id)))
 70                 return -EFAULT;
 71 
 72         return 0;
 73 }
 74 
 75 static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 76 {
 77         __u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
 78         struct kvm_regs *regs = vcpu_gp_regs(vcpu);
 79         int nr_regs = sizeof(*regs) / sizeof(__u32);
 80         __uint128_t tmp;
 81         void *valp = &tmp;
 82         u64 off;
 83         int err = 0;
 84 
 85         /* Our ID is an index into the kvm_regs struct. */
 86         off = core_reg_offset_from_id(reg->id);
 87         if (off >= nr_regs ||
 88             (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
 89                 return -ENOENT;
 90 
 91         if (KVM_REG_SIZE(reg->id) > sizeof(tmp))
 92                 return -EINVAL;
 93 
 94         if (copy_from_user(valp, uaddr, KVM_REG_SIZE(reg->id))) {
 95                 err = -EFAULT;
 96                 goto out;
 97         }
 98 
 99         if (off == KVM_REG_ARM_CORE_REG(regs.pstate)) {
100                 u32 mode = (*(u32 *)valp) & COMPAT_PSR_MODE_MASK;
101                 switch (mode) {
102                 case COMPAT_PSR_MODE_USR:
103                 case COMPAT_PSR_MODE_FIQ:
104                 case COMPAT_PSR_MODE_IRQ:
105                 case COMPAT_PSR_MODE_SVC:
106                 case COMPAT_PSR_MODE_ABT:
107                 case COMPAT_PSR_MODE_UND:
108                 case PSR_MODE_EL0t:
109                 case PSR_MODE_EL1t:
110                 case PSR_MODE_EL1h:
111                         break;
112                 default:
113                         err = -EINVAL;
114                         goto out;
115                 }
116         }
117 
118         memcpy((u32 *)regs + off, valp, KVM_REG_SIZE(reg->id));
119 out:
120         return err;
121 }
122 
123 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
124 {
125         return -EINVAL;
126 }
127 
128 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
129 {
130         return -EINVAL;
131 }
132 
133 static unsigned long num_core_regs(void)
134 {
135         return sizeof(struct kvm_regs) / sizeof(__u32);
136 }
137 
138 /**
139  * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
140  *
141  * This is for all registers.
142  */
143 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
144 {
145         return num_core_regs() + kvm_arm_num_sys_reg_descs(vcpu);
146 }
147 
148 /**
149  * kvm_arm_copy_reg_indices - get indices of all registers.
150  *
151  * We do core registers right here, then we apppend system regs.
152  */
153 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
154 {
155         unsigned int i;
156         const u64 core_reg = KVM_REG_ARM64 | KVM_REG_SIZE_U64 | KVM_REG_ARM_CORE;
157 
158         for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) {
159                 if (put_user(core_reg | i, uindices))
160                         return -EFAULT;
161                 uindices++;
162         }
163 
164         return kvm_arm_copy_sys_reg_indices(vcpu, uindices);
165 }
166 
167 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
168 {
169         /* We currently use nothing arch-specific in upper 32 bits */
170         if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
171                 return -EINVAL;
172 
173         /* Register group 16 means we want a core register. */
174         if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
175                 return get_core_reg(vcpu, reg);
176 
177         return kvm_arm_sys_reg_get_reg(vcpu, reg);
178 }
179 
180 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
181 {
182         /* We currently use nothing arch-specific in upper 32 bits */
183         if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
184                 return -EINVAL;
185 
186         /* Register group 16 means we set a core register. */
187         if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
188                 return set_core_reg(vcpu, reg);
189 
190         return kvm_arm_sys_reg_set_reg(vcpu, reg);
191 }
192 
193 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
194                                   struct kvm_sregs *sregs)
195 {
196         return -EINVAL;
197 }
198 
199 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
200                                   struct kvm_sregs *sregs)
201 {
202         return -EINVAL;
203 }
204 
205 int __attribute_const__ kvm_target_cpu(void)
206 {
207         unsigned long implementor = read_cpuid_implementor();
208         unsigned long part_number = read_cpuid_part_number();
209 
210         switch (implementor) {
211         case ARM_CPU_IMP_ARM:
212                 switch (part_number) {
213                 case ARM_CPU_PART_AEM_V8:
214                         return KVM_ARM_TARGET_AEM_V8;
215                 case ARM_CPU_PART_FOUNDATION:
216                         return KVM_ARM_TARGET_FOUNDATION_V8;
217                 case ARM_CPU_PART_CORTEX_A57:
218                         return KVM_ARM_TARGET_CORTEX_A57;
219                 };
220                 break;
221         case ARM_CPU_IMP_APM:
222                 switch (part_number) {
223                 case APM_CPU_PART_POTENZA:
224                         return KVM_ARM_TARGET_XGENE_POTENZA;
225                 };
226                 break;
227         };
228 
229         return -EINVAL;
230 }
231 
232 int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
233                         const struct kvm_vcpu_init *init)
234 {
235         unsigned int i;
236         int phys_target = kvm_target_cpu();
237 
238         if (init->target != phys_target)
239                 return -EINVAL;
240 
241         vcpu->arch.target = phys_target;
242         bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
243 
244         /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
245         for (i = 0; i < sizeof(init->features) * 8; i++) {
246                 if (init->features[i / 32] & (1 << (i % 32))) {
247                         if (i >= KVM_VCPU_MAX_FEATURES)
248                                 return -ENOENT;
249                         set_bit(i, vcpu->arch.features);
250                 }
251         }
252 
253         /* Now we know what it is, we can reset it. */
254         return kvm_reset_vcpu(vcpu);
255 }
256 
257 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
258 {
259         int target = kvm_target_cpu();
260 
261         if (target < 0)
262                 return -ENODEV;
263 
264         memset(init, 0, sizeof(*init));
265 
266         /*
267          * For now, we don't return any features.
268          * In future, we might use features to return target
269          * specific features available for the preferred
270          * target type.
271          */
272         init->target = (__u32)target;
273 
274         return 0;
275 }
276 
277 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
278 {
279         return -EINVAL;
280 }
281 
282 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
283 {
284         return -EINVAL;
285 }
286 
287 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
288                                   struct kvm_translation *tr)
289 {
290         return -EINVAL;
291 }
292 

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