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_asm.h>
30 #include <asm/kvm_mmio.h>
31 #include <asm/ptrace.h>
32 #include <asm/cputype.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_dabt(struct kvm_vcpu *vcpu, unsigned long addr);
42 void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
43
vcpu_el1_is_32bit(struct kvm_vcpu * vcpu)44 static inline bool vcpu_el1_is_32bit(struct kvm_vcpu *vcpu)
45 {
46 return !(vcpu->arch.hcr_el2 & HCR_RW);
47 }
48
vcpu_reset_hcr(struct kvm_vcpu * vcpu)49 static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu)
50 {
51 vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS;
52 if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features))
53 vcpu->arch.hcr_el2 &= ~HCR_RW;
54 }
55
vcpu_get_hcr(struct kvm_vcpu * vcpu)56 static inline unsigned long vcpu_get_hcr(struct kvm_vcpu *vcpu)
57 {
58 return vcpu->arch.hcr_el2;
59 }
60
vcpu_set_hcr(struct kvm_vcpu * vcpu,unsigned long hcr)61 static inline void vcpu_set_hcr(struct kvm_vcpu *vcpu, unsigned long hcr)
62 {
63 vcpu->arch.hcr_el2 = hcr;
64 }
65
vcpu_pc(const struct kvm_vcpu * vcpu)66 static inline unsigned long *vcpu_pc(const struct kvm_vcpu *vcpu)
67 {
68 return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pc;
69 }
70
vcpu_elr_el1(const struct kvm_vcpu * vcpu)71 static inline unsigned long *vcpu_elr_el1(const struct kvm_vcpu *vcpu)
72 {
73 return (unsigned long *)&vcpu_gp_regs(vcpu)->elr_el1;
74 }
75
vcpu_cpsr(const struct kvm_vcpu * vcpu)76 static inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu)
77 {
78 return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pstate;
79 }
80
vcpu_mode_is_32bit(const struct kvm_vcpu * vcpu)81 static inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu)
82 {
83 return !!(*vcpu_cpsr(vcpu) & PSR_MODE32_BIT);
84 }
85
kvm_condition_valid(const struct kvm_vcpu * vcpu)86 static inline bool kvm_condition_valid(const struct kvm_vcpu *vcpu)
87 {
88 if (vcpu_mode_is_32bit(vcpu))
89 return kvm_condition_valid32(vcpu);
90
91 return true;
92 }
93
kvm_skip_instr(struct kvm_vcpu * vcpu,bool is_wide_instr)94 static inline void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr)
95 {
96 if (vcpu_mode_is_32bit(vcpu))
97 kvm_skip_instr32(vcpu, is_wide_instr);
98 else
99 *vcpu_pc(vcpu) += 4;
100 }
101
vcpu_set_thumb(struct kvm_vcpu * vcpu)102 static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu)
103 {
104 *vcpu_cpsr(vcpu) |= COMPAT_PSR_T_BIT;
105 }
106
107 /*
108 * vcpu_get_reg and vcpu_set_reg should always be passed a register number
109 * coming from a read of ESR_EL2. Otherwise, it may give the wrong result on
110 * AArch32 with banked registers.
111 */
vcpu_get_reg(const struct kvm_vcpu * vcpu,u8 reg_num)112 static inline unsigned long vcpu_get_reg(const struct kvm_vcpu *vcpu,
113 u8 reg_num)
114 {
115 return (reg_num == 31) ? 0 : vcpu_gp_regs(vcpu)->regs.regs[reg_num];
116 }
117
vcpu_set_reg(struct kvm_vcpu * vcpu,u8 reg_num,unsigned long val)118 static inline void vcpu_set_reg(struct kvm_vcpu *vcpu, u8 reg_num,
119 unsigned long val)
120 {
121 if (reg_num != 31)
122 vcpu_gp_regs(vcpu)->regs.regs[reg_num] = val;
123 }
124
125 /* Get vcpu SPSR for current mode */
vcpu_spsr(const struct kvm_vcpu * vcpu)126 static inline unsigned long *vcpu_spsr(const struct kvm_vcpu *vcpu)
127 {
128 if (vcpu_mode_is_32bit(vcpu))
129 return vcpu_spsr32(vcpu);
130
131 return (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1];
132 }
133
vcpu_mode_priv(const struct kvm_vcpu * vcpu)134 static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu)
135 {
136 u32 mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK;
137
138 if (vcpu_mode_is_32bit(vcpu))
139 return mode > COMPAT_PSR_MODE_USR;
140
141 return mode != PSR_MODE_EL0t;
142 }
143
kvm_vcpu_get_hsr(const struct kvm_vcpu * vcpu)144 static inline u32 kvm_vcpu_get_hsr(const struct kvm_vcpu *vcpu)
145 {
146 return vcpu->arch.fault.esr_el2;
147 }
148
kvm_vcpu_get_hfar(const struct kvm_vcpu * vcpu)149 static inline unsigned long kvm_vcpu_get_hfar(const struct kvm_vcpu *vcpu)
150 {
151 return vcpu->arch.fault.far_el2;
152 }
153
kvm_vcpu_get_fault_ipa(const struct kvm_vcpu * vcpu)154 static inline phys_addr_t kvm_vcpu_get_fault_ipa(const struct kvm_vcpu *vcpu)
155 {
156 return ((phys_addr_t)vcpu->arch.fault.hpfar_el2 & HPFAR_MASK) << 8;
157 }
158
kvm_vcpu_hvc_get_imm(const struct kvm_vcpu * vcpu)159 static inline u32 kvm_vcpu_hvc_get_imm(const struct kvm_vcpu *vcpu)
160 {
161 return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_xVC_IMM_MASK;
162 }
163
kvm_vcpu_dabt_isvalid(const struct kvm_vcpu * vcpu)164 static inline bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu)
165 {
166 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_ISV);
167 }
168
kvm_vcpu_dabt_iswrite(const struct kvm_vcpu * vcpu)169 static inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu)
170 {
171 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_WNR);
172 }
173
kvm_vcpu_dabt_issext(const struct kvm_vcpu * vcpu)174 static inline bool kvm_vcpu_dabt_issext(const struct kvm_vcpu *vcpu)
175 {
176 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SSE);
177 }
178
kvm_vcpu_dabt_get_rd(const struct kvm_vcpu * vcpu)179 static inline int kvm_vcpu_dabt_get_rd(const struct kvm_vcpu *vcpu)
180 {
181 return (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SRT_MASK) >> ESR_ELx_SRT_SHIFT;
182 }
183
kvm_vcpu_dabt_isextabt(const struct kvm_vcpu * vcpu)184 static inline bool kvm_vcpu_dabt_isextabt(const struct kvm_vcpu *vcpu)
185 {
186 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_EA);
187 }
188
kvm_vcpu_dabt_iss1tw(const struct kvm_vcpu * vcpu)189 static inline bool kvm_vcpu_dabt_iss1tw(const struct kvm_vcpu *vcpu)
190 {
191 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_S1PTW);
192 }
193
kvm_vcpu_dabt_get_as(const struct kvm_vcpu * vcpu)194 static inline int kvm_vcpu_dabt_get_as(const struct kvm_vcpu *vcpu)
195 {
196 return 1 << ((kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SAS) >> ESR_ELx_SAS_SHIFT);
197 }
198
199 /* This one is not specific to Data Abort */
kvm_vcpu_trap_il_is32bit(const struct kvm_vcpu * vcpu)200 static inline bool kvm_vcpu_trap_il_is32bit(const struct kvm_vcpu *vcpu)
201 {
202 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_IL);
203 }
204
kvm_vcpu_trap_get_class(const struct kvm_vcpu * vcpu)205 static inline u8 kvm_vcpu_trap_get_class(const struct kvm_vcpu *vcpu)
206 {
207 return kvm_vcpu_get_hsr(vcpu) >> ESR_ELx_EC_SHIFT;
208 }
209
kvm_vcpu_trap_is_iabt(const struct kvm_vcpu * vcpu)210 static inline bool kvm_vcpu_trap_is_iabt(const struct kvm_vcpu *vcpu)
211 {
212 return kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_IABT_LOW;
213 }
214
kvm_vcpu_trap_get_fault(const struct kvm_vcpu * vcpu)215 static inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu)
216 {
217 return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC;
218 }
219
kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu * vcpu)220 static inline u8 kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu *vcpu)
221 {
222 return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC_TYPE;
223 }
224
kvm_vcpu_get_mpidr_aff(struct kvm_vcpu * vcpu)225 static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu)
226 {
227 return vcpu_sys_reg(vcpu, MPIDR_EL1) & MPIDR_HWID_BITMASK;
228 }
229
kvm_vcpu_set_be(struct kvm_vcpu * vcpu)230 static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu)
231 {
232 if (vcpu_mode_is_32bit(vcpu))
233 *vcpu_cpsr(vcpu) |= COMPAT_PSR_E_BIT;
234 else
235 vcpu_sys_reg(vcpu, SCTLR_EL1) |= (1 << 25);
236 }
237
kvm_vcpu_is_be(struct kvm_vcpu * vcpu)238 static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu)
239 {
240 if (vcpu_mode_is_32bit(vcpu))
241 return !!(*vcpu_cpsr(vcpu) & COMPAT_PSR_E_BIT);
242
243 return !!(vcpu_sys_reg(vcpu, SCTLR_EL1) & (1 << 25));
244 }
245
vcpu_data_guest_to_host(struct kvm_vcpu * vcpu,unsigned long data,unsigned int len)246 static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu,
247 unsigned long data,
248 unsigned int len)
249 {
250 if (kvm_vcpu_is_be(vcpu)) {
251 switch (len) {
252 case 1:
253 return data & 0xff;
254 case 2:
255 return be16_to_cpu(data & 0xffff);
256 case 4:
257 return be32_to_cpu(data & 0xffffffff);
258 default:
259 return be64_to_cpu(data);
260 }
261 } else {
262 switch (len) {
263 case 1:
264 return data & 0xff;
265 case 2:
266 return le16_to_cpu(data & 0xffff);
267 case 4:
268 return le32_to_cpu(data & 0xffffffff);
269 default:
270 return le64_to_cpu(data);
271 }
272 }
273
274 return data; /* Leave LE untouched */
275 }
276
vcpu_data_host_to_guest(struct kvm_vcpu * vcpu,unsigned long data,unsigned int len)277 static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
278 unsigned long data,
279 unsigned int len)
280 {
281 if (kvm_vcpu_is_be(vcpu)) {
282 switch (len) {
283 case 1:
284 return data & 0xff;
285 case 2:
286 return cpu_to_be16(data & 0xffff);
287 case 4:
288 return cpu_to_be32(data & 0xffffffff);
289 default:
290 return cpu_to_be64(data);
291 }
292 } else {
293 switch (len) {
294 case 1:
295 return data & 0xff;
296 case 2:
297 return cpu_to_le16(data & 0xffff);
298 case 4:
299 return cpu_to_le32(data & 0xffffffff);
300 default:
301 return cpu_to_le64(data);
302 }
303 }
304
305 return data; /* Leave LE untouched */
306 }
307
308 #endif /* __ARM64_KVM_EMULATE_H__ */
309