Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 1 | /* |
| 2 | * This program is free software; you can redistribute it and/or modify |
| 3 | * it under the terms of the GNU General Public License, version 2, as |
| 4 | * published by the Free Software Foundation. |
| 5 | * |
| 6 | * This program is distributed in the hope that it will be useful, |
| 7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 9 | * GNU General Public License for more details. |
| 10 | * |
| 11 | * You should have received a copy of the GNU General Public License |
| 12 | * along with this program; if not, write to the Free Software |
| 13 | * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 14 | * |
| 15 | * Copyright SUSE Linux Products GmbH 2009 |
| 16 | * |
| 17 | * Authors: Alexander Graf <agraf@suse.de> |
| 18 | */ |
| 19 | |
| 20 | #include <asm/ppc_asm.h> |
| 21 | #include <asm/kvm_asm.h> |
| 22 | #include <asm/reg.h> |
| 23 | #include <asm/page.h> |
| 24 | #include <asm/asm-offsets.h> |
| 25 | #include <asm/exception-64s.h> |
| 26 | |
| 27 | #define KVMPPC_HANDLE_EXIT .kvmppc_handle_exit |
| 28 | #define ULONG_SIZE 8 |
| 29 | #define VCPU_GPR(n) (VCPU_GPRS + (n * ULONG_SIZE)) |
| 30 | |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 31 | .macro DISABLE_INTERRUPTS |
| 32 | mfmsr r0 |
| 33 | rldicl r0,r0,48,1 |
| 34 | rotldi r0,r0,16 |
| 35 | mtmsrd r0,1 |
| 36 | .endm |
| 37 | |
Alexander Graf | 97c4cfb | 2010-01-04 22:19:25 +0100 | [diff] [blame] | 38 | #define VCPU_LOAD_NVGPRS(vcpu) \ |
| 39 | ld r14, VCPU_GPR(r14)(vcpu); \ |
| 40 | ld r15, VCPU_GPR(r15)(vcpu); \ |
| 41 | ld r16, VCPU_GPR(r16)(vcpu); \ |
| 42 | ld r17, VCPU_GPR(r17)(vcpu); \ |
| 43 | ld r18, VCPU_GPR(r18)(vcpu); \ |
| 44 | ld r19, VCPU_GPR(r19)(vcpu); \ |
| 45 | ld r20, VCPU_GPR(r20)(vcpu); \ |
| 46 | ld r21, VCPU_GPR(r21)(vcpu); \ |
| 47 | ld r22, VCPU_GPR(r22)(vcpu); \ |
| 48 | ld r23, VCPU_GPR(r23)(vcpu); \ |
| 49 | ld r24, VCPU_GPR(r24)(vcpu); \ |
| 50 | ld r25, VCPU_GPR(r25)(vcpu); \ |
| 51 | ld r26, VCPU_GPR(r26)(vcpu); \ |
| 52 | ld r27, VCPU_GPR(r27)(vcpu); \ |
| 53 | ld r28, VCPU_GPR(r28)(vcpu); \ |
| 54 | ld r29, VCPU_GPR(r29)(vcpu); \ |
| 55 | ld r30, VCPU_GPR(r30)(vcpu); \ |
| 56 | ld r31, VCPU_GPR(r31)(vcpu); \ |
| 57 | |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 58 | /***************************************************************************** |
| 59 | * * |
| 60 | * Guest entry / exit code that is in kernel module memory (highmem) * |
| 61 | * * |
| 62 | ****************************************************************************/ |
| 63 | |
| 64 | /* Registers: |
| 65 | * r3: kvm_run pointer |
| 66 | * r4: vcpu pointer |
| 67 | */ |
| 68 | _GLOBAL(__kvmppc_vcpu_entry) |
| 69 | |
| 70 | kvm_start_entry: |
| 71 | /* Write correct stack frame */ |
| 72 | mflr r0 |
| 73 | std r0,16(r1) |
| 74 | |
| 75 | /* Save host state to the stack */ |
| 76 | stdu r1, -SWITCH_FRAME_SIZE(r1) |
| 77 | |
| 78 | /* Save r3 (kvm_run) and r4 (vcpu) */ |
| 79 | SAVE_2GPRS(3, r1) |
| 80 | |
| 81 | /* Save non-volatile registers (r14 - r31) */ |
| 82 | SAVE_NVGPRS(r1) |
| 83 | |
| 84 | /* Save LR */ |
Alexander Graf | 97c4cfb | 2010-01-04 22:19:25 +0100 | [diff] [blame] | 85 | std r0, _LINK(r1) |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 86 | |
Alexander Graf | 97c4cfb | 2010-01-04 22:19:25 +0100 | [diff] [blame] | 87 | /* Load non-volatile guest state from the vcpu */ |
| 88 | VCPU_LOAD_NVGPRS(r4) |
| 89 | |
Alexander Graf | 7e57cba | 2010-01-08 02:58:03 +0100 | [diff] [blame] | 90 | /* Save R1/R2 in the PACA */ |
| 91 | std r1, PACA_KVM_HOST_R1(r13) |
| 92 | std r2, PACA_KVM_HOST_R2(r13) |
| 93 | |
| 94 | /* XXX swap in/out on load? */ |
| 95 | ld r3, VCPU_HIGHMEM_HANDLER(r4) |
| 96 | std r3, PACA_KVM_VMHANDLER(r13) |
| 97 | |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 98 | kvm_start_lightweight: |
| 99 | |
Alexander Graf | 97c4cfb | 2010-01-04 22:19:25 +0100 | [diff] [blame] | 100 | ld r9, VCPU_PC(r4) /* r9 = vcpu->arch.pc */ |
| 101 | ld r10, VCPU_SHADOW_MSR(r4) /* r10 = vcpu->arch.shadow_msr */ |
| 102 | |
Alexander Graf | 7e57cba | 2010-01-08 02:58:03 +0100 | [diff] [blame] | 103 | /* Load some guest state in the respective registers */ |
Alexander Graf | 021ec9c | 2010-01-08 02:58:06 +0100 | [diff] [blame] | 104 | ld r5, VCPU_CTR(r4) /* r5 = vcpu->arch.ctr */ |
| 105 | /* will be swapped in by rmcall */ |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 106 | |
| 107 | ld r3, VCPU_LR(r4) /* r3 = vcpu->arch.lr */ |
| 108 | mtlr r3 /* LR = r3 */ |
| 109 | |
Alexander Graf | 7e57cba | 2010-01-08 02:58:03 +0100 | [diff] [blame] | 110 | DISABLE_INTERRUPTS |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 111 | |
| 112 | /* Some guests may need to have dcbz set to 32 byte length. |
| 113 | * |
| 114 | * Usually we ensure that by patching the guest's instructions |
| 115 | * to trap on dcbz and emulate it in the hypervisor. |
| 116 | * |
| 117 | * If we can, we should tell the CPU to use 32 byte dcbz though, |
| 118 | * because that's a lot faster. |
| 119 | */ |
| 120 | |
| 121 | ld r3, VCPU_HFLAGS(r4) |
| 122 | rldicl. r3, r3, 0, 63 /* CR = ((r3 & 1) == 0) */ |
| 123 | beq no_dcbz32_on |
| 124 | |
| 125 | mfspr r3,SPRN_HID5 |
| 126 | ori r3, r3, 0x80 /* XXX HID5_dcbz32 = 0x80 */ |
| 127 | mtspr SPRN_HID5,r3 |
| 128 | |
| 129 | no_dcbz32_on: |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 130 | |
Alexander Graf | 021ec9c | 2010-01-08 02:58:06 +0100 | [diff] [blame] | 131 | ld r6, VCPU_RMCALL(r4) |
| 132 | mtctr r6 |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 133 | |
Alexander Graf | 021ec9c | 2010-01-08 02:58:06 +0100 | [diff] [blame] | 134 | ld r3, VCPU_TRAMPOLINE_ENTER(r4) |
| 135 | LOAD_REG_IMMEDIATE(r4, MSR_KERNEL & ~(MSR_IR | MSR_DR)) |
Alexander Graf | 7e57cba | 2010-01-08 02:58:03 +0100 | [diff] [blame] | 136 | |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 137 | /* Jump to SLB patching handlder and into our guest */ |
Alexander Graf | 021ec9c | 2010-01-08 02:58:06 +0100 | [diff] [blame] | 138 | bctr |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 139 | |
| 140 | /* |
| 141 | * This is the handler in module memory. It gets jumped at from the |
| 142 | * lowmem trampoline code, so it's basically the guest exit code. |
| 143 | * |
| 144 | */ |
| 145 | |
| 146 | .global kvmppc_handler_highmem |
| 147 | kvmppc_handler_highmem: |
| 148 | |
| 149 | /* |
| 150 | * Register usage at this point: |
| 151 | * |
Alexander Graf | 7e57cba | 2010-01-08 02:58:03 +0100 | [diff] [blame] | 152 | * R0 = guest last inst |
| 153 | * R1 = host R1 |
| 154 | * R2 = host R2 |
| 155 | * R3 = guest PC |
| 156 | * R4 = guest MSR |
| 157 | * R5 = guest DAR |
| 158 | * R6 = guest DSISR |
| 159 | * R13 = PACA |
| 160 | * PACA.KVM.* = guest * |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 161 | * |
| 162 | */ |
| 163 | |
Alexander Graf | 7e57cba | 2010-01-08 02:58:03 +0100 | [diff] [blame] | 164 | /* R7 = vcpu */ |
| 165 | ld r7, GPR4(r1) |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 166 | |
| 167 | /* Now save the guest state */ |
| 168 | |
Alexander Graf | 7e57cba | 2010-01-08 02:58:03 +0100 | [diff] [blame] | 169 | stw r0, VCPU_LAST_INST(r7) |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 170 | |
Alexander Graf | 7e57cba | 2010-01-08 02:58:03 +0100 | [diff] [blame] | 171 | std r3, VCPU_PC(r7) |
| 172 | std r4, VCPU_SHADOW_MSR(r7) |
| 173 | std r5, VCPU_FAULT_DEAR(r7) |
| 174 | std r6, VCPU_FAULT_DSISR(r7) |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 175 | |
Alexander Graf | 7e57cba | 2010-01-08 02:58:03 +0100 | [diff] [blame] | 176 | ld r5, VCPU_HFLAGS(r7) |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 177 | rldicl. r5, r5, 0, 63 /* CR = ((r5 & 1) == 0) */ |
| 178 | beq no_dcbz32_off |
| 179 | |
| 180 | mfspr r5,SPRN_HID5 |
| 181 | rldimi r5,r5,6,56 |
| 182 | mtspr SPRN_HID5,r5 |
| 183 | |
| 184 | no_dcbz32_off: |
| 185 | |
Alexander Graf | 7e57cba | 2010-01-08 02:58:03 +0100 | [diff] [blame] | 186 | std r14, VCPU_GPR(r14)(r7) |
| 187 | std r15, VCPU_GPR(r15)(r7) |
| 188 | std r16, VCPU_GPR(r16)(r7) |
| 189 | std r17, VCPU_GPR(r17)(r7) |
| 190 | std r18, VCPU_GPR(r18)(r7) |
| 191 | std r19, VCPU_GPR(r19)(r7) |
| 192 | std r20, VCPU_GPR(r20)(r7) |
| 193 | std r21, VCPU_GPR(r21)(r7) |
| 194 | std r22, VCPU_GPR(r22)(r7) |
| 195 | std r23, VCPU_GPR(r23)(r7) |
| 196 | std r24, VCPU_GPR(r24)(r7) |
| 197 | std r25, VCPU_GPR(r25)(r7) |
| 198 | std r26, VCPU_GPR(r26)(r7) |
| 199 | std r27, VCPU_GPR(r27)(r7) |
| 200 | std r28, VCPU_GPR(r28)(r7) |
| 201 | std r29, VCPU_GPR(r29)(r7) |
| 202 | std r30, VCPU_GPR(r30)(r7) |
| 203 | std r31, VCPU_GPR(r31)(r7) |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 204 | |
Alexander Graf | 7e57cba | 2010-01-08 02:58:03 +0100 | [diff] [blame] | 205 | /* Save guest CTR */ |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 206 | mfctr r5 |
Alexander Graf | 7e57cba | 2010-01-08 02:58:03 +0100 | [diff] [blame] | 207 | std r5, VCPU_CTR(r7) |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 208 | |
| 209 | /* Save guest LR */ |
| 210 | mflr r5 |
Alexander Graf | 7e57cba | 2010-01-08 02:58:03 +0100 | [diff] [blame] | 211 | std r5, VCPU_LR(r7) |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 212 | |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 213 | /* Restore host msr -> SRR1 */ |
Alexander Graf | 7e57cba | 2010-01-08 02:58:03 +0100 | [diff] [blame] | 214 | ld r6, VCPU_HOST_MSR(r7) |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 215 | |
| 216 | /* |
| 217 | * For some interrupts, we need to call the real Linux |
| 218 | * handler, so it can do work for us. This has to happen |
| 219 | * as if the interrupt arrived from the kernel though, |
| 220 | * so let's fake it here where most state is restored. |
| 221 | * |
| 222 | * Call Linux for hardware interrupts/decrementer |
| 223 | * r3 = address of interrupt handler (exit reason) |
| 224 | */ |
| 225 | |
Alexander Graf | 7e57cba | 2010-01-08 02:58:03 +0100 | [diff] [blame] | 226 | cmpwi r12, BOOK3S_INTERRUPT_EXTERNAL |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 227 | beq call_linux_handler |
Alexander Graf | 7e57cba | 2010-01-08 02:58:03 +0100 | [diff] [blame] | 228 | cmpwi r12, BOOK3S_INTERRUPT_DECREMENTER |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 229 | beq call_linux_handler |
| 230 | |
Alexander Graf | bc90923 | 2010-01-08 02:58:05 +0100 | [diff] [blame] | 231 | /* Back to EE=1 */ |
| 232 | mtmsr r6 |
| 233 | b kvm_return_point |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 234 | |
| 235 | call_linux_handler: |
| 236 | |
| 237 | /* |
| 238 | * If we land here we need to jump back to the handler we |
| 239 | * came from. |
| 240 | * |
| 241 | * We have a page that we can access from real mode, so let's |
| 242 | * jump back to that and use it as a trampoline to get back into the |
| 243 | * interrupt handler! |
| 244 | * |
| 245 | * R3 still contains the exit code, |
Alexander Graf | bc90923 | 2010-01-08 02:58:05 +0100 | [diff] [blame] | 246 | * R5 VCPU_HOST_RETIP and |
| 247 | * R6 VCPU_HOST_MSR |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 248 | */ |
| 249 | |
Alexander Graf | bc90923 | 2010-01-08 02:58:05 +0100 | [diff] [blame] | 250 | /* Restore host IP -> SRR0 */ |
| 251 | ld r5, VCPU_HOST_RETIP(r7) |
| 252 | |
| 253 | /* XXX Better move to a safe function? |
| 254 | * What if we get an HTAB flush in between mtsrr0 and mtsrr1? */ |
| 255 | |
Alexander Graf | 7e57cba | 2010-01-08 02:58:03 +0100 | [diff] [blame] | 256 | mtlr r12 |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 257 | |
Alexander Graf | 7e57cba | 2010-01-08 02:58:03 +0100 | [diff] [blame] | 258 | ld r4, VCPU_TRAMPOLINE_LOWMEM(r7) |
| 259 | mtsrr0 r4 |
| 260 | LOAD_REG_IMMEDIATE(r3, MSR_KERNEL & ~(MSR_IR | MSR_DR)) |
| 261 | mtsrr1 r3 |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 262 | |
| 263 | RFI |
| 264 | |
| 265 | .global kvm_return_point |
| 266 | kvm_return_point: |
| 267 | |
| 268 | /* Jump back to lightweight entry if we're supposed to */ |
| 269 | /* go back into the guest */ |
Alexander Graf | 97c4cfb | 2010-01-04 22:19:25 +0100 | [diff] [blame] | 270 | |
| 271 | /* Pass the exit number as 3rd argument to kvmppc_handle_exit */ |
Alexander Graf | 7e57cba | 2010-01-08 02:58:03 +0100 | [diff] [blame] | 272 | mr r5, r12 |
Alexander Graf | 97c4cfb | 2010-01-04 22:19:25 +0100 | [diff] [blame] | 273 | |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 274 | /* Restore r3 (kvm_run) and r4 (vcpu) */ |
| 275 | REST_2GPRS(3, r1) |
| 276 | bl KVMPPC_HANDLE_EXIT |
| 277 | |
Alexander Graf | 97c4cfb | 2010-01-04 22:19:25 +0100 | [diff] [blame] | 278 | /* If RESUME_GUEST, get back in the loop */ |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 279 | cmpwi r3, RESUME_GUEST |
Alexander Graf | 97c4cfb | 2010-01-04 22:19:25 +0100 | [diff] [blame] | 280 | beq kvm_loop_lightweight |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 281 | |
Alexander Graf | 97c4cfb | 2010-01-04 22:19:25 +0100 | [diff] [blame] | 282 | cmpwi r3, RESUME_GUEST_NV |
| 283 | beq kvm_loop_heavyweight |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 284 | |
Alexander Graf | 97c4cfb | 2010-01-04 22:19:25 +0100 | [diff] [blame] | 285 | kvm_exit_loop: |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 286 | |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 287 | ld r4, _LINK(r1) |
| 288 | mtlr r4 |
| 289 | |
Alexander Graf | 97c4cfb | 2010-01-04 22:19:25 +0100 | [diff] [blame] | 290 | /* Restore non-volatile host registers (r14 - r31) */ |
| 291 | REST_NVGPRS(r1) |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 292 | |
Alexander Graf | 97c4cfb | 2010-01-04 22:19:25 +0100 | [diff] [blame] | 293 | addi r1, r1, SWITCH_FRAME_SIZE |
| 294 | blr |
| 295 | |
| 296 | kvm_loop_heavyweight: |
| 297 | |
| 298 | ld r4, _LINK(r1) |
| 299 | std r4, (16 + SWITCH_FRAME_SIZE)(r1) |
| 300 | |
| 301 | /* Load vcpu and cpu_run */ |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 302 | REST_2GPRS(3, r1) |
| 303 | |
Alexander Graf | 97c4cfb | 2010-01-04 22:19:25 +0100 | [diff] [blame] | 304 | /* Load non-volatile guest state from the vcpu */ |
| 305 | VCPU_LOAD_NVGPRS(r4) |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 306 | |
Alexander Graf | 97c4cfb | 2010-01-04 22:19:25 +0100 | [diff] [blame] | 307 | /* Jump back into the beginning of this function */ |
| 308 | b kvm_start_lightweight |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 309 | |
Alexander Graf | 97c4cfb | 2010-01-04 22:19:25 +0100 | [diff] [blame] | 310 | kvm_loop_lightweight: |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 311 | |
Alexander Graf | 97c4cfb | 2010-01-04 22:19:25 +0100 | [diff] [blame] | 312 | /* We'll need the vcpu pointer */ |
| 313 | REST_GPR(4, r1) |
Alexander Graf | 29eb61b | 2009-10-30 05:47:07 +0000 | [diff] [blame] | 314 | |
Alexander Graf | 97c4cfb | 2010-01-04 22:19:25 +0100 | [diff] [blame] | 315 | /* Jump back into the beginning of this function */ |
| 316 | b kvm_start_lightweight |
| 317 | |