1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * 4 * Copyright SUSE Linux Products GmbH 2009 5 * 6 * Authors: Alexander Graf <agraf@suse.de> 7 */ 8 9 #include <asm/ppc_asm.h> 10 #include <asm/kvm_asm.h> 11 #include <asm/reg.h> 12 #include <asm/page.h> 13 #include <asm/asm-offsets.h> 14 #include <asm/exception-64s.h> 15 #include <asm/asm-compat.h> 16 17 #if defined(CONFIG_PPC_BOOK3S_64) 18 #ifdef CONFIG_PPC64_ELF_ABI_V2 19 #define FUNC(name) name 20 #else 21 #define FUNC(name) GLUE(.,name) 22 #endif 23 #define GET_SHADOW_VCPU(reg) addi reg, r13, PACA_SVCPU 24 25 #elif defined(CONFIG_PPC_BOOK3S_32) 26 #define FUNC(name) name 27 #define GET_SHADOW_VCPU(reg) lwz reg, (THREAD + THREAD_KVM_SVCPU)(r2) 28 29 #endif /* CONFIG_PPC_BOOK3S_64 */ 30 31 #define VCPU_LOAD_NVGPRS(vcpu) \ 32 PPC_LL r14, VCPU_GPR(R14)(vcpu); \ 33 PPC_LL r15, VCPU_GPR(R15)(vcpu); \ 34 PPC_LL r16, VCPU_GPR(R16)(vcpu); \ 35 PPC_LL r17, VCPU_GPR(R17)(vcpu); \ 36 PPC_LL r18, VCPU_GPR(R18)(vcpu); \ 37 PPC_LL r19, VCPU_GPR(R19)(vcpu); \ 38 PPC_LL r20, VCPU_GPR(R20)(vcpu); \ 39 PPC_LL r21, VCPU_GPR(R21)(vcpu); \ 40 PPC_LL r22, VCPU_GPR(R22)(vcpu); \ 41 PPC_LL r23, VCPU_GPR(R23)(vcpu); \ 42 PPC_LL r24, VCPU_GPR(R24)(vcpu); \ 43 PPC_LL r25, VCPU_GPR(R25)(vcpu); \ 44 PPC_LL r26, VCPU_GPR(R26)(vcpu); \ 45 PPC_LL r27, VCPU_GPR(R27)(vcpu); \ 46 PPC_LL r28, VCPU_GPR(R28)(vcpu); \ 47 PPC_LL r29, VCPU_GPR(R29)(vcpu); \ 48 PPC_LL r30, VCPU_GPR(R30)(vcpu); \ 49 PPC_LL r31, VCPU_GPR(R31)(vcpu); \ 50 51 /***************************************************************************** 52 * * 53 * Guest entry / exit code that is in kernel module memory (highmem) * 54 * * 55 ****************************************************************************/ 56 57 /* Registers: 58 * r3: vcpu pointer 59 */ 60 _GLOBAL(__kvmppc_vcpu_run) 61 62 kvm_start_entry: 63 /* Write correct stack frame */ 64 mflr r0 65 PPC_STL r0,PPC_LR_STKOFF(r1) 66 67 /* Save host state to the stack */ 68 PPC_STLU r1, -SWITCH_FRAME_SIZE(r1) 69 70 /* Save r3 (vcpu) */ 71 SAVE_GPR(3, r1) 72 73 /* Save non-volatile registers (r14 - r31) */ 74 SAVE_NVGPRS(r1) 75 76 /* Save CR */ 77 mfcr r14 78 stw r14, _CCR(r1) 79 80 /* Save LR */ 81 PPC_STL r0, _LINK(r1) 82 83 /* Load non-volatile guest state from the vcpu */ 84 VCPU_LOAD_NVGPRS(r3) 85 86 kvm_start_lightweight: 87 /* Copy registers into shadow vcpu so we can access them in real mode */ 88 bl FUNC(kvmppc_copy_to_svcpu) 89 nop 90 REST_GPR(3, r1) 91 92 #ifdef CONFIG_PPC_BOOK3S_64 93 /* Get the dcbz32 flag */ 94 PPC_LL r0, VCPU_HFLAGS(r3) 95 rldicl r0, r0, 0, 63 /* r3 &= 1 */ 96 stb r0, HSTATE_RESTORE_HID5(r13) 97 98 /* Load up guest SPRG3 value, since it's user readable */ 99 lbz r4, VCPU_SHAREDBE(r3) 100 cmpwi r4, 0 101 ld r5, VCPU_SHARED(r3) 102 beq sprg3_little_endian 103 sprg3_big_endian: 104 #ifdef __BIG_ENDIAN__ 105 ld r4, VCPU_SHARED_SPRG3(r5) 106 #else 107 addi r5, r5, VCPU_SHARED_SPRG3 108 ldbrx r4, 0, r5 109 #endif 110 b after_sprg3_load 111 sprg3_little_endian: 112 #ifdef __LITTLE_ENDIAN__ 113 ld r4, VCPU_SHARED_SPRG3(r5) 114 #else 115 addi r5, r5, VCPU_SHARED_SPRG3 116 ldbrx r4, 0, r5 117 #endif 118 119 after_sprg3_load: 120 mtspr SPRN_SPRG3, r4 121 #endif /* CONFIG_PPC_BOOK3S_64 */ 122 123 PPC_LL r4, VCPU_SHADOW_MSR(r3) /* get shadow_msr */ 124 125 /* Jump to segment patching handler and into our guest */ 126 bl FUNC(kvmppc_entry_trampoline) 127 nop 128 129 /* 130 * This is the handler in module memory. It gets jumped at from the 131 * lowmem trampoline code, so it's basically the guest exit code. 132 * 133 */ 134 135 /* 136 * Register usage at this point: 137 * 138 * R1 = host R1 139 * R2 = host R2 140 * R12 = exit handler id 141 * R13 = PACA 142 * SVCPU.* = guest * 143 * MSR.EE = 1 144 * 145 */ 146 147 PPC_LL r3, GPR3(r1) /* vcpu pointer */ 148 149 /* 150 * kvmppc_copy_from_svcpu can clobber volatile registers, save 151 * the exit handler id to the vcpu and restore it from there later. 152 */ 153 stw r12, VCPU_TRAP(r3) 154 155 /* Transfer reg values from shadow vcpu back to vcpu struct */ 156 157 bl FUNC(kvmppc_copy_from_svcpu) 158 nop 159 160 #ifdef CONFIG_PPC_BOOK3S_64 161 /* 162 * Reload kernel SPRG3 value. 163 * No need to save guest value as usermode can't modify SPRG3. 164 */ 165 ld r3, PACA_SPRG_VDSO(r13) 166 mtspr SPRN_SPRG_VDSO_WRITE, r3 167 #endif /* CONFIG_PPC_BOOK3S_64 */ 168 169 /* R7 = vcpu */ 170 PPC_LL r7, GPR3(r1) 171 172 PPC_STL r14, VCPU_GPR(R14)(r7) 173 PPC_STL r15, VCPU_GPR(R15)(r7) 174 PPC_STL r16, VCPU_GPR(R16)(r7) 175 PPC_STL r17, VCPU_GPR(R17)(r7) 176 PPC_STL r18, VCPU_GPR(R18)(r7) 177 PPC_STL r19, VCPU_GPR(R19)(r7) 178 PPC_STL r20, VCPU_GPR(R20)(r7) 179 PPC_STL r21, VCPU_GPR(R21)(r7) 180 PPC_STL r22, VCPU_GPR(R22)(r7) 181 PPC_STL r23, VCPU_GPR(R23)(r7) 182 PPC_STL r24, VCPU_GPR(R24)(r7) 183 PPC_STL r25, VCPU_GPR(R25)(r7) 184 PPC_STL r26, VCPU_GPR(R26)(r7) 185 PPC_STL r27, VCPU_GPR(R27)(r7) 186 PPC_STL r28, VCPU_GPR(R28)(r7) 187 PPC_STL r29, VCPU_GPR(R29)(r7) 188 PPC_STL r30, VCPU_GPR(R30)(r7) 189 PPC_STL r31, VCPU_GPR(R31)(r7) 190 191 /* Pass the exit number as 2nd argument to kvmppc_handle_exit */ 192 lwz r4, VCPU_TRAP(r7) 193 194 /* Restore r3 (vcpu) */ 195 REST_GPR(3, r1) 196 bl FUNC(kvmppc_handle_exit_pr) 197 198 /* If RESUME_GUEST, get back in the loop */ 199 cmpwi r3, RESUME_GUEST 200 beq kvm_loop_lightweight 201 202 cmpwi r3, RESUME_GUEST_NV 203 beq kvm_loop_heavyweight 204 205 kvm_exit_loop: 206 207 PPC_LL r4, _LINK(r1) 208 mtlr r4 209 210 lwz r14, _CCR(r1) 211 mtcr r14 212 213 /* Restore non-volatile host registers (r14 - r31) */ 214 REST_NVGPRS(r1) 215 216 addi r1, r1, SWITCH_FRAME_SIZE 217 blr 218 219 kvm_loop_heavyweight: 220 221 PPC_LL r4, _LINK(r1) 222 PPC_STL r4, (PPC_LR_STKOFF + SWITCH_FRAME_SIZE)(r1) 223 224 /* Load vcpu */ 225 REST_GPR(3, r1) 226 227 /* Load non-volatile guest state from the vcpu */ 228 VCPU_LOAD_NVGPRS(r3) 229 230 /* Jump back into the beginning of this function */ 231 b kvm_start_lightweight 232 233 kvm_loop_lightweight: 234 235 /* We'll need the vcpu pointer */ 236 REST_GPR(3, r1) 237 238 /* Jump back into the beginning of this function */ 239 b kvm_start_lightweight
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