| /* |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License, version 2, as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| * |
| * Copyright SUSE Linux Products GmbH 2010 |
| * |
| * Authors: Alexander Graf <agraf@suse.de> |
| */ |
| |
| /* Real mode helpers */ |
| |
| #if defined(CONFIG_PPC_BOOK3S_64) |
| |
| #define GET_SHADOW_VCPU(reg) \ |
| mr reg, r13 |
| #define MTMSR_EERI(reg) mtmsrd (reg),1 |
| |
| #elif defined(CONFIG_PPC_BOOK3S_32) |
| |
| #define GET_SHADOW_VCPU(reg) \ |
| tophys(reg, r2); \ |
| lwz reg, (THREAD + THREAD_KVM_SVCPU)(reg); \ |
| tophys(reg, reg) |
| #define MTMSR_EERI(reg) mtmsr (reg) |
| |
| #endif |
| |
| /* Disable for nested KVM */ |
| #define USE_QUICK_LAST_INST |
| |
| |
| /* Get helper functions for subarch specific functionality */ |
| |
| #if defined(CONFIG_PPC_BOOK3S_64) |
| #include "book3s_64_slb.S" |
| #elif defined(CONFIG_PPC_BOOK3S_32) |
| #include "book3s_32_sr.S" |
| #endif |
| |
| /****************************************************************************** |
| * * |
| * Entry code * |
| * * |
| *****************************************************************************/ |
| |
| .global kvmppc_handler_trampoline_enter |
| kvmppc_handler_trampoline_enter: |
| |
| /* Required state: |
| * |
| * MSR = ~IR|DR |
| * R1 = host R1 |
| * R2 = host R2 |
| * R4 = guest shadow MSR |
| * R5 = normal host MSR |
| * R6 = current host MSR (EE, IR, DR off) |
| * LR = highmem guest exit code |
| * all other volatile GPRS = free |
| * SVCPU[CR] = guest CR |
| * SVCPU[XER] = guest XER |
| * SVCPU[CTR] = guest CTR |
| * SVCPU[LR] = guest LR |
| */ |
| |
| /* r3 = shadow vcpu */ |
| GET_SHADOW_VCPU(r3) |
| |
| /* Save guest exit handler address and MSR */ |
| mflr r0 |
| PPC_STL r0, HSTATE_VMHANDLER(r3) |
| PPC_STL r5, HSTATE_HOST_MSR(r3) |
| |
| /* Save R1/R2 in the PACA (64-bit) or shadow_vcpu (32-bit) */ |
| PPC_STL r1, HSTATE_HOST_R1(r3) |
| PPC_STL r2, HSTATE_HOST_R2(r3) |
| |
| /* Activate guest mode, so faults get handled by KVM */ |
| li r11, KVM_GUEST_MODE_GUEST |
| stb r11, HSTATE_IN_GUEST(r3) |
| |
| /* Switch to guest segment. This is subarch specific. */ |
| LOAD_GUEST_SEGMENTS |
| |
| #ifdef CONFIG_PPC_BOOK3S_64 |
| /* Some guests may need to have dcbz set to 32 byte length. |
| * |
| * Usually we ensure that by patching the guest's instructions |
| * to trap on dcbz and emulate it in the hypervisor. |
| * |
| * If we can, we should tell the CPU to use 32 byte dcbz though, |
| * because that's a lot faster. |
| */ |
| lbz r0, HSTATE_RESTORE_HID5(r3) |
| cmpwi r0, 0 |
| beq no_dcbz32_on |
| |
| mfspr r0,SPRN_HID5 |
| ori r0, r0, 0x80 /* XXX HID5_dcbz32 = 0x80 */ |
| mtspr SPRN_HID5,r0 |
| no_dcbz32_on: |
| |
| #endif /* CONFIG_PPC_BOOK3S_64 */ |
| |
| /* Enter guest */ |
| |
| PPC_LL r8, SVCPU_CTR(r3) |
| PPC_LL r9, SVCPU_LR(r3) |
| lwz r10, SVCPU_CR(r3) |
| lwz r11, SVCPU_XER(r3) |
| |
| mtctr r8 |
| mtlr r9 |
| mtcr r10 |
| mtxer r11 |
| |
| /* Move SRR0 and SRR1 into the respective regs */ |
| PPC_LL r9, SVCPU_PC(r3) |
| /* First clear RI in our current MSR value */ |
| li r0, MSR_RI |
| andc r6, r6, r0 |
| MTMSR_EERI(r6) |
| mtsrr0 r9 |
| mtsrr1 r4 |
| |
| PPC_LL r0, SVCPU_R0(r3) |
| PPC_LL r1, SVCPU_R1(r3) |
| PPC_LL r2, SVCPU_R2(r3) |
| PPC_LL r4, SVCPU_R4(r3) |
| PPC_LL r5, SVCPU_R5(r3) |
| PPC_LL r6, SVCPU_R6(r3) |
| PPC_LL r7, SVCPU_R7(r3) |
| PPC_LL r8, SVCPU_R8(r3) |
| PPC_LL r9, SVCPU_R9(r3) |
| PPC_LL r10, SVCPU_R10(r3) |
| PPC_LL r11, SVCPU_R11(r3) |
| PPC_LL r12, SVCPU_R12(r3) |
| PPC_LL r13, SVCPU_R13(r3) |
| |
| PPC_LL r3, (SVCPU_R3)(r3) |
| |
| RFI |
| kvmppc_handler_trampoline_enter_end: |
| |
| |
| |
| /****************************************************************************** |
| * * |
| * Exit code * |
| * * |
| *****************************************************************************/ |
| |
| .global kvmppc_handler_trampoline_exit |
| kvmppc_handler_trampoline_exit: |
| |
| .global kvmppc_interrupt |
| kvmppc_interrupt: |
| |
| /* Register usage at this point: |
| * |
| * SPRG_SCRATCH0 = guest R13 |
| * R12 = exit handler id |
| * R13 = shadow vcpu (32-bit) or PACA (64-bit) |
| * HSTATE.SCRATCH0 = guest R12 |
| * HSTATE.SCRATCH1 = guest CR |
| * |
| */ |
| |
| /* Save registers */ |
| |
| PPC_STL r0, SVCPU_R0(r13) |
| PPC_STL r1, SVCPU_R1(r13) |
| PPC_STL r2, SVCPU_R2(r13) |
| PPC_STL r3, SVCPU_R3(r13) |
| PPC_STL r4, SVCPU_R4(r13) |
| PPC_STL r5, SVCPU_R5(r13) |
| PPC_STL r6, SVCPU_R6(r13) |
| PPC_STL r7, SVCPU_R7(r13) |
| PPC_STL r8, SVCPU_R8(r13) |
| PPC_STL r9, SVCPU_R9(r13) |
| PPC_STL r10, SVCPU_R10(r13) |
| PPC_STL r11, SVCPU_R11(r13) |
| |
| /* Restore R1/R2 so we can handle faults */ |
| PPC_LL r1, HSTATE_HOST_R1(r13) |
| PPC_LL r2, HSTATE_HOST_R2(r13) |
| |
| /* Save guest PC and MSR */ |
| #ifdef CONFIG_PPC64 |
| BEGIN_FTR_SECTION |
| andi. r0,r12,0x2 |
| beq 1f |
| mfspr r3,SPRN_HSRR0 |
| mfspr r4,SPRN_HSRR1 |
| andi. r12,r12,0x3ffd |
| b 2f |
| END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) |
| #endif |
| 1: mfsrr0 r3 |
| mfsrr1 r4 |
| 2: |
| PPC_STL r3, SVCPU_PC(r13) |
| PPC_STL r4, SVCPU_SHADOW_SRR1(r13) |
| |
| /* Get scratch'ed off registers */ |
| GET_SCRATCH0(r9) |
| PPC_LL r8, HSTATE_SCRATCH0(r13) |
| lwz r7, HSTATE_SCRATCH1(r13) |
| |
| PPC_STL r9, SVCPU_R13(r13) |
| PPC_STL r8, SVCPU_R12(r13) |
| stw r7, SVCPU_CR(r13) |
| |
| /* Save more register state */ |
| |
| mfxer r5 |
| mfdar r6 |
| mfdsisr r7 |
| mfctr r8 |
| mflr r9 |
| |
| stw r5, SVCPU_XER(r13) |
| PPC_STL r6, SVCPU_FAULT_DAR(r13) |
| stw r7, SVCPU_FAULT_DSISR(r13) |
| PPC_STL r8, SVCPU_CTR(r13) |
| PPC_STL r9, SVCPU_LR(r13) |
| |
| /* |
| * In order for us to easily get the last instruction, |
| * we got the #vmexit at, we exploit the fact that the |
| * virtual layout is still the same here, so we can just |
| * ld from the guest's PC address |
| */ |
| |
| /* We only load the last instruction when it's safe */ |
| cmpwi r12, BOOK3S_INTERRUPT_DATA_STORAGE |
| beq ld_last_inst |
| cmpwi r12, BOOK3S_INTERRUPT_PROGRAM |
| beq ld_last_inst |
| cmpwi r12, BOOK3S_INTERRUPT_SYSCALL |
| beq ld_last_prev_inst |
| cmpwi r12, BOOK3S_INTERRUPT_ALIGNMENT |
| beq- ld_last_inst |
| |
| b no_ld_last_inst |
| |
| ld_last_prev_inst: |
| addi r3, r3, -4 |
| |
| ld_last_inst: |
| /* Save off the guest instruction we're at */ |
| |
| /* In case lwz faults */ |
| li r0, KVM_INST_FETCH_FAILED |
| |
| #ifdef USE_QUICK_LAST_INST |
| |
| /* Set guest mode to 'jump over instruction' so if lwz faults |
| * we'll just continue at the next IP. */ |
| li r9, KVM_GUEST_MODE_SKIP |
| stb r9, HSTATE_IN_GUEST(r13) |
| |
| /* 1) enable paging for data */ |
| mfmsr r9 |
| ori r11, r9, MSR_DR /* Enable paging for data */ |
| mtmsr r11 |
| sync |
| /* 2) fetch the instruction */ |
| lwz r0, 0(r3) |
| /* 3) disable paging again */ |
| mtmsr r9 |
| sync |
| |
| #endif |
| stw r0, SVCPU_LAST_INST(r13) |
| |
| no_ld_last_inst: |
| |
| /* Unset guest mode */ |
| li r9, KVM_GUEST_MODE_NONE |
| stb r9, HSTATE_IN_GUEST(r13) |
| |
| /* Switch back to host MMU */ |
| LOAD_HOST_SEGMENTS |
| |
| #ifdef CONFIG_PPC_BOOK3S_64 |
| |
| lbz r5, HSTATE_RESTORE_HID5(r13) |
| cmpwi r5, 0 |
| beq no_dcbz32_off |
| |
| li r4, 0 |
| mfspr r5,SPRN_HID5 |
| rldimi r5,r4,6,56 |
| mtspr SPRN_HID5,r5 |
| |
| no_dcbz32_off: |
| |
| #endif /* CONFIG_PPC_BOOK3S_64 */ |
| |
| /* |
| * For some interrupts, we need to call the real Linux |
| * handler, so it can do work for us. This has to happen |
| * as if the interrupt arrived from the kernel though, |
| * so let's fake it here where most state is restored. |
| * |
| * Having set up SRR0/1 with the address where we want |
| * to continue with relocation on (potentially in module |
| * space), we either just go straight there with rfi[d], |
| * or we jump to an interrupt handler with bctr if there |
| * is an interrupt to be handled first. In the latter |
| * case, the rfi[d] at the end of the interrupt handler |
| * will get us back to where we want to continue. |
| */ |
| |
| cmpwi r12, BOOK3S_INTERRUPT_EXTERNAL |
| beq 1f |
| cmpwi r12, BOOK3S_INTERRUPT_DECREMENTER |
| beq 1f |
| cmpwi r12, BOOK3S_INTERRUPT_PERFMON |
| 1: mtctr r12 |
| |
| /* Register usage at this point: |
| * |
| * R1 = host R1 |
| * R2 = host R2 |
| * R12 = exit handler id |
| * R13 = shadow vcpu (32-bit) or PACA (64-bit) |
| * SVCPU.* = guest * |
| * |
| */ |
| |
| PPC_LL r6, HSTATE_HOST_MSR(r13) |
| PPC_LL r8, HSTATE_VMHANDLER(r13) |
| |
| /* Restore host msr -> SRR1 */ |
| mtsrr1 r6 |
| /* Load highmem handler address */ |
| mtsrr0 r8 |
| |
| /* RFI into the highmem handler, or jump to interrupt handler */ |
| beqctr |
| RFI |
| kvmppc_handler_trampoline_exit_end: |