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TOMOYO Linux Cross Reference
Linux/arch/arm64/include/asm/kvm_emulate.h

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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/include/kvm_emulate.h
  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 #ifndef __ARM64_KVM_EMULATE_H__
 23 #define __ARM64_KVM_EMULATE_H__
 24 
 25 #include <linux/kvm_host.h>
 26 
 27 #include <asm/esr.h>
 28 #include <asm/kvm_arm.h>
 29 #include <asm/kvm_mmio.h>
 30 #include <asm/ptrace.h>
 31 #include <asm/cputype.h>
 32 #include <asm/virt.h>
 33 
 34 unsigned long *vcpu_reg32(const struct kvm_vcpu *vcpu, u8 reg_num);
 35 unsigned long *vcpu_spsr32(const struct kvm_vcpu *vcpu);
 36 
 37 bool kvm_condition_valid32(const struct kvm_vcpu *vcpu);
 38 void kvm_skip_instr32(struct kvm_vcpu *vcpu, bool is_wide_instr);
 39 
 40 void kvm_inject_undefined(struct kvm_vcpu *vcpu);
 41 void kvm_inject_vabt(struct kvm_vcpu *vcpu);
 42 void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr);
 43 void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
 44 
 45 static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu)
 46 {
 47         vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS;
 48         if (is_kernel_in_hyp_mode())
 49                 vcpu->arch.hcr_el2 |= HCR_E2H;
 50         if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features))
 51                 vcpu->arch.hcr_el2 &= ~HCR_RW;
 52 }
 53 
 54 static inline unsigned long vcpu_get_hcr(struct kvm_vcpu *vcpu)
 55 {
 56         return vcpu->arch.hcr_el2;
 57 }
 58 
 59 static inline void vcpu_set_hcr(struct kvm_vcpu *vcpu, unsigned long hcr)
 60 {
 61         vcpu->arch.hcr_el2 = hcr;
 62 }
 63 
 64 static inline unsigned long *vcpu_pc(const struct kvm_vcpu *vcpu)
 65 {
 66         return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pc;
 67 }
 68 
 69 static inline unsigned long *vcpu_elr_el1(const struct kvm_vcpu *vcpu)
 70 {
 71         return (unsigned long *)&vcpu_gp_regs(vcpu)->elr_el1;
 72 }
 73 
 74 static inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu)
 75 {
 76         return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pstate;
 77 }
 78 
 79 static inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu)
 80 {
 81         return !!(*vcpu_cpsr(vcpu) & PSR_MODE32_BIT);
 82 }
 83 
 84 static inline bool kvm_condition_valid(const struct kvm_vcpu *vcpu)
 85 {
 86         if (vcpu_mode_is_32bit(vcpu))
 87                 return kvm_condition_valid32(vcpu);
 88 
 89         return true;
 90 }
 91 
 92 static inline void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr)
 93 {
 94         if (vcpu_mode_is_32bit(vcpu))
 95                 kvm_skip_instr32(vcpu, is_wide_instr);
 96         else
 97                 *vcpu_pc(vcpu) += 4;
 98 }
 99 
100 static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu)
101 {
102         *vcpu_cpsr(vcpu) |= COMPAT_PSR_T_BIT;
103 }
104 
105 /*
106  * vcpu_get_reg and vcpu_set_reg should always be passed a register number
107  * coming from a read of ESR_EL2. Otherwise, it may give the wrong result on
108  * AArch32 with banked registers.
109  */
110 static inline unsigned long vcpu_get_reg(const struct kvm_vcpu *vcpu,
111                                          u8 reg_num)
112 {
113         return (reg_num == 31) ? 0 : vcpu_gp_regs(vcpu)->regs.regs[reg_num];
114 }
115 
116 static inline void vcpu_set_reg(struct kvm_vcpu *vcpu, u8 reg_num,
117                                 unsigned long val)
118 {
119         if (reg_num != 31)
120                 vcpu_gp_regs(vcpu)->regs.regs[reg_num] = val;
121 }
122 
123 /* Get vcpu SPSR for current mode */
124 static inline unsigned long *vcpu_spsr(const struct kvm_vcpu *vcpu)
125 {
126         if (vcpu_mode_is_32bit(vcpu))
127                 return vcpu_spsr32(vcpu);
128 
129         return (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1];
130 }
131 
132 static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu)
133 {
134         u32 mode;
135 
136         if (vcpu_mode_is_32bit(vcpu)) {
137                 mode = *vcpu_cpsr(vcpu) & COMPAT_PSR_MODE_MASK;
138                 return mode > COMPAT_PSR_MODE_USR;
139         }
140 
141         mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK;
142 
143         return mode != PSR_MODE_EL0t;
144 }
145 
146 static inline u32 kvm_vcpu_get_hsr(const struct kvm_vcpu *vcpu)
147 {
148         return vcpu->arch.fault.esr_el2;
149 }
150 
151 static inline int kvm_vcpu_get_condition(const struct kvm_vcpu *vcpu)
152 {
153         u32 esr = kvm_vcpu_get_hsr(vcpu);
154 
155         if (esr & ESR_ELx_CV)
156                 return (esr & ESR_ELx_COND_MASK) >> ESR_ELx_COND_SHIFT;
157 
158         return -1;
159 }
160 
161 static inline unsigned long kvm_vcpu_get_hfar(const struct kvm_vcpu *vcpu)
162 {
163         return vcpu->arch.fault.far_el2;
164 }
165 
166 static inline phys_addr_t kvm_vcpu_get_fault_ipa(const struct kvm_vcpu *vcpu)
167 {
168         return ((phys_addr_t)vcpu->arch.fault.hpfar_el2 & HPFAR_MASK) << 8;
169 }
170 
171 static inline u32 kvm_vcpu_hvc_get_imm(const struct kvm_vcpu *vcpu)
172 {
173         return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_xVC_IMM_MASK;
174 }
175 
176 static inline bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu)
177 {
178         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_ISV);
179 }
180 
181 static inline bool kvm_vcpu_dabt_issext(const struct kvm_vcpu *vcpu)
182 {
183         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SSE);
184 }
185 
186 static inline int kvm_vcpu_dabt_get_rd(const struct kvm_vcpu *vcpu)
187 {
188         return (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SRT_MASK) >> ESR_ELx_SRT_SHIFT;
189 }
190 
191 static inline bool kvm_vcpu_dabt_isextabt(const struct kvm_vcpu *vcpu)
192 {
193         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_EA);
194 }
195 
196 static inline bool kvm_vcpu_dabt_iss1tw(const struct kvm_vcpu *vcpu)
197 {
198         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_S1PTW);
199 }
200 
201 static inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu)
202 {
203         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_WNR) ||
204                 kvm_vcpu_dabt_iss1tw(vcpu); /* AF/DBM update */
205 }
206 
207 static inline bool kvm_vcpu_dabt_is_cm(const struct kvm_vcpu *vcpu)
208 {
209         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_CM);
210 }
211 
212 static inline int kvm_vcpu_dabt_get_as(const struct kvm_vcpu *vcpu)
213 {
214         return 1 << ((kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SAS) >> ESR_ELx_SAS_SHIFT);
215 }
216 
217 /* This one is not specific to Data Abort */
218 static inline bool kvm_vcpu_trap_il_is32bit(const struct kvm_vcpu *vcpu)
219 {
220         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_IL);
221 }
222 
223 static inline u8 kvm_vcpu_trap_get_class(const struct kvm_vcpu *vcpu)
224 {
225         return ESR_ELx_EC(kvm_vcpu_get_hsr(vcpu));
226 }
227 
228 static inline bool kvm_vcpu_trap_is_iabt(const struct kvm_vcpu *vcpu)
229 {
230         return kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_IABT_LOW;
231 }
232 
233 static inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu)
234 {
235         return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC;
236 }
237 
238 static inline u8 kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu *vcpu)
239 {
240         return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC_TYPE;
241 }
242 
243 static inline int kvm_vcpu_sys_get_rt(struct kvm_vcpu *vcpu)
244 {
245         u32 esr = kvm_vcpu_get_hsr(vcpu);
246         return (esr & ESR_ELx_SYS64_ISS_RT_MASK) >> ESR_ELx_SYS64_ISS_RT_SHIFT;
247 }
248 
249 static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu)
250 {
251         return vcpu_sys_reg(vcpu, MPIDR_EL1) & MPIDR_HWID_BITMASK;
252 }
253 
254 static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu)
255 {
256         if (vcpu_mode_is_32bit(vcpu))
257                 *vcpu_cpsr(vcpu) |= COMPAT_PSR_E_BIT;
258         else
259                 vcpu_sys_reg(vcpu, SCTLR_EL1) |= (1 << 25);
260 }
261 
262 static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu)
263 {
264         if (vcpu_mode_is_32bit(vcpu))
265                 return !!(*vcpu_cpsr(vcpu) & COMPAT_PSR_E_BIT);
266 
267         return !!(vcpu_sys_reg(vcpu, SCTLR_EL1) & (1 << 25));
268 }
269 
270 static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu,
271                                                     unsigned long data,
272                                                     unsigned int len)
273 {
274         if (kvm_vcpu_is_be(vcpu)) {
275                 switch (len) {
276                 case 1:
277                         return data & 0xff;
278                 case 2:
279                         return be16_to_cpu(data & 0xffff);
280                 case 4:
281                         return be32_to_cpu(data & 0xffffffff);
282                 default:
283                         return be64_to_cpu(data);
284                 }
285         } else {
286                 switch (len) {
287                 case 1:
288                         return data & 0xff;
289                 case 2:
290                         return le16_to_cpu(data & 0xffff);
291                 case 4:
292                         return le32_to_cpu(data & 0xffffffff);
293                 default:
294                         return le64_to_cpu(data);
295                 }
296         }
297 
298         return data;            /* Leave LE untouched */
299 }
300 
301 static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
302                                                     unsigned long data,
303                                                     unsigned int len)
304 {
305         if (kvm_vcpu_is_be(vcpu)) {
306                 switch (len) {
307                 case 1:
308                         return data & 0xff;
309                 case 2:
310                         return cpu_to_be16(data & 0xffff);
311                 case 4:
312                         return cpu_to_be32(data & 0xffffffff);
313                 default:
314                         return cpu_to_be64(data);
315                 }
316         } else {
317                 switch (len) {
318                 case 1:
319                         return data & 0xff;
320                 case 2:
321                         return cpu_to_le16(data & 0xffff);
322                 case 4:
323                         return cpu_to_le32(data & 0xffffffff);
324                 default:
325                         return cpu_to_le64(data);
326                 }
327         }
328 
329         return data;            /* Leave LE untouched */
330 }
331 
332 #endif /* __ARM64_KVM_EMULATE_H__ */
333 

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