| /* |
| * 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 2009 |
| * |
| * Authors: Alexander Graf <agraf@suse.de> |
| */ |
| |
| #include <asm/ppc_asm.h> |
| #include <asm/kvm_asm.h> |
| #include <asm/reg.h> |
| #include <asm/page.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/exception-64s.h> |
| |
| #define KVMPPC_HANDLE_EXIT .kvmppc_handle_exit |
| #define ULONG_SIZE 8 |
| #define VCPU_GPR(n) (VCPU_GPRS + (n * ULONG_SIZE)) |
| |
| .macro DISABLE_INTERRUPTS |
| mfmsr r0 |
| rldicl r0,r0,48,1 |
| rotldi r0,r0,16 |
| mtmsrd r0,1 |
| .endm |
| |
| #define VCPU_LOAD_NVGPRS(vcpu) \ |
| ld r14, VCPU_GPR(r14)(vcpu); \ |
| ld r15, VCPU_GPR(r15)(vcpu); \ |
| ld r16, VCPU_GPR(r16)(vcpu); \ |
| ld r17, VCPU_GPR(r17)(vcpu); \ |
| ld r18, VCPU_GPR(r18)(vcpu); \ |
| ld r19, VCPU_GPR(r19)(vcpu); \ |
| ld r20, VCPU_GPR(r20)(vcpu); \ |
| ld r21, VCPU_GPR(r21)(vcpu); \ |
| ld r22, VCPU_GPR(r22)(vcpu); \ |
| ld r23, VCPU_GPR(r23)(vcpu); \ |
| ld r24, VCPU_GPR(r24)(vcpu); \ |
| ld r25, VCPU_GPR(r25)(vcpu); \ |
| ld r26, VCPU_GPR(r26)(vcpu); \ |
| ld r27, VCPU_GPR(r27)(vcpu); \ |
| ld r28, VCPU_GPR(r28)(vcpu); \ |
| ld r29, VCPU_GPR(r29)(vcpu); \ |
| ld r30, VCPU_GPR(r30)(vcpu); \ |
| ld r31, VCPU_GPR(r31)(vcpu); \ |
| |
| /***************************************************************************** |
| * * |
| * Guest entry / exit code that is in kernel module memory (highmem) * |
| * * |
| ****************************************************************************/ |
| |
| /* Registers: |
| * r3: kvm_run pointer |
| * r4: vcpu pointer |
| */ |
| _GLOBAL(__kvmppc_vcpu_entry) |
| |
| kvm_start_entry: |
| /* Write correct stack frame */ |
| mflr r0 |
| std r0,16(r1) |
| |
| /* Save host state to the stack */ |
| stdu r1, -SWITCH_FRAME_SIZE(r1) |
| |
| /* Save r3 (kvm_run) and r4 (vcpu) */ |
| SAVE_2GPRS(3, r1) |
| |
| /* Save non-volatile registers (r14 - r31) */ |
| SAVE_NVGPRS(r1) |
| |
| /* Save LR */ |
| std r0, _LINK(r1) |
| |
| /* Load non-volatile guest state from the vcpu */ |
| VCPU_LOAD_NVGPRS(r4) |
| |
| /* Save R1/R2 in the PACA */ |
| std r1, PACA_KVM_HOST_R1(r13) |
| std r2, PACA_KVM_HOST_R2(r13) |
| |
| /* XXX swap in/out on load? */ |
| ld r3, VCPU_HIGHMEM_HANDLER(r4) |
| std r3, PACA_KVM_VMHANDLER(r13) |
| |
| kvm_start_lightweight: |
| |
| ld r9, VCPU_PC(r4) /* r9 = vcpu->arch.pc */ |
| ld r10, VCPU_SHADOW_MSR(r4) /* r10 = vcpu->arch.shadow_msr */ |
| |
| /* Load some guest state in the respective registers */ |
| ld r5, VCPU_CTR(r4) /* r5 = vcpu->arch.ctr */ |
| /* will be swapped in by rmcall */ |
| |
| ld r3, VCPU_LR(r4) /* r3 = vcpu->arch.lr */ |
| mtlr r3 /* LR = r3 */ |
| |
| DISABLE_INTERRUPTS |
| |
| /* 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. |
| */ |
| |
| ld r3, VCPU_HFLAGS(r4) |
| rldicl. r3, r3, 0, 63 /* CR = ((r3 & 1) == 0) */ |
| beq no_dcbz32_on |
| |
| mfspr r3,SPRN_HID5 |
| ori r3, r3, 0x80 /* XXX HID5_dcbz32 = 0x80 */ |
| mtspr SPRN_HID5,r3 |
| |
| no_dcbz32_on: |
| |
| ld r6, VCPU_RMCALL(r4) |
| mtctr r6 |
| |
| ld r3, VCPU_TRAMPOLINE_ENTER(r4) |
| LOAD_REG_IMMEDIATE(r4, MSR_KERNEL & ~(MSR_IR | MSR_DR)) |
| |
| /* Jump to SLB patching handlder and into our guest */ |
| bctr |
| |
| /* |
| * This is the handler in module memory. It gets jumped at from the |
| * lowmem trampoline code, so it's basically the guest exit code. |
| * |
| */ |
| |
| .global kvmppc_handler_highmem |
| kvmppc_handler_highmem: |
| |
| /* |
| * Register usage at this point: |
| * |
| * R0 = guest last inst |
| * R1 = host R1 |
| * R2 = host R2 |
| * R3 = guest PC |
| * R4 = guest MSR |
| * R5 = guest DAR |
| * R6 = guest DSISR |
| * R13 = PACA |
| * PACA.KVM.* = guest * |
| * |
| */ |
| |
| /* R7 = vcpu */ |
| ld r7, GPR4(r1) |
| |
| /* Now save the guest state */ |
| |
| stw r0, VCPU_LAST_INST(r7) |
| |
| std r3, VCPU_PC(r7) |
| std r4, VCPU_SHADOW_SRR1(r7) |
| std r5, VCPU_FAULT_DEAR(r7) |
| std r6, VCPU_FAULT_DSISR(r7) |
| |
| ld r5, VCPU_HFLAGS(r7) |
| rldicl. r5, r5, 0, 63 /* CR = ((r5 & 1) == 0) */ |
| beq no_dcbz32_off |
| |
| li r4, 0 |
| mfspr r5,SPRN_HID5 |
| rldimi r5,r4,6,56 |
| mtspr SPRN_HID5,r5 |
| |
| no_dcbz32_off: |
| |
| std r14, VCPU_GPR(r14)(r7) |
| std r15, VCPU_GPR(r15)(r7) |
| std r16, VCPU_GPR(r16)(r7) |
| std r17, VCPU_GPR(r17)(r7) |
| std r18, VCPU_GPR(r18)(r7) |
| std r19, VCPU_GPR(r19)(r7) |
| std r20, VCPU_GPR(r20)(r7) |
| std r21, VCPU_GPR(r21)(r7) |
| std r22, VCPU_GPR(r22)(r7) |
| std r23, VCPU_GPR(r23)(r7) |
| std r24, VCPU_GPR(r24)(r7) |
| std r25, VCPU_GPR(r25)(r7) |
| std r26, VCPU_GPR(r26)(r7) |
| std r27, VCPU_GPR(r27)(r7) |
| std r28, VCPU_GPR(r28)(r7) |
| std r29, VCPU_GPR(r29)(r7) |
| std r30, VCPU_GPR(r30)(r7) |
| std r31, VCPU_GPR(r31)(r7) |
| |
| /* Save guest CTR */ |
| mfctr r5 |
| std r5, VCPU_CTR(r7) |
| |
| /* Save guest LR */ |
| mflr r5 |
| std r5, VCPU_LR(r7) |
| |
| /* Restore host msr -> SRR1 */ |
| ld r6, VCPU_HOST_MSR(r7) |
| |
| /* |
| * 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. |
| * |
| * Call Linux for hardware interrupts/decrementer |
| * r3 = address of interrupt handler (exit reason) |
| */ |
| |
| cmpwi r12, BOOK3S_INTERRUPT_EXTERNAL |
| beq call_linux_handler |
| cmpwi r12, BOOK3S_INTERRUPT_DECREMENTER |
| beq call_linux_handler |
| |
| /* Back to EE=1 */ |
| mtmsr r6 |
| b kvm_return_point |
| |
| call_linux_handler: |
| |
| /* |
| * If we land here we need to jump back to the handler we |
| * came from. |
| * |
| * We have a page that we can access from real mode, so let's |
| * jump back to that and use it as a trampoline to get back into the |
| * interrupt handler! |
| * |
| * R3 still contains the exit code, |
| * R5 VCPU_HOST_RETIP and |
| * R6 VCPU_HOST_MSR |
| */ |
| |
| /* Restore host IP -> SRR0 */ |
| ld r5, VCPU_HOST_RETIP(r7) |
| |
| /* XXX Better move to a safe function? |
| * What if we get an HTAB flush in between mtsrr0 and mtsrr1? */ |
| |
| mtlr r12 |
| |
| ld r4, VCPU_TRAMPOLINE_LOWMEM(r7) |
| mtsrr0 r4 |
| LOAD_REG_IMMEDIATE(r3, MSR_KERNEL & ~(MSR_IR | MSR_DR)) |
| mtsrr1 r3 |
| |
| RFI |
| |
| .global kvm_return_point |
| kvm_return_point: |
| |
| /* Jump back to lightweight entry if we're supposed to */ |
| /* go back into the guest */ |
| |
| /* Pass the exit number as 3rd argument to kvmppc_handle_exit */ |
| mr r5, r12 |
| |
| /* Restore r3 (kvm_run) and r4 (vcpu) */ |
| REST_2GPRS(3, r1) |
| bl KVMPPC_HANDLE_EXIT |
| |
| /* If RESUME_GUEST, get back in the loop */ |
| cmpwi r3, RESUME_GUEST |
| beq kvm_loop_lightweight |
| |
| cmpwi r3, RESUME_GUEST_NV |
| beq kvm_loop_heavyweight |
| |
| kvm_exit_loop: |
| |
| ld r4, _LINK(r1) |
| mtlr r4 |
| |
| /* Restore non-volatile host registers (r14 - r31) */ |
| REST_NVGPRS(r1) |
| |
| addi r1, r1, SWITCH_FRAME_SIZE |
| blr |
| |
| kvm_loop_heavyweight: |
| |
| ld r4, _LINK(r1) |
| std r4, (16 + SWITCH_FRAME_SIZE)(r1) |
| |
| /* Load vcpu and cpu_run */ |
| REST_2GPRS(3, r1) |
| |
| /* Load non-volatile guest state from the vcpu */ |
| VCPU_LOAD_NVGPRS(r4) |
| |
| /* Jump back into the beginning of this function */ |
| b kvm_start_lightweight |
| |
| kvm_loop_lightweight: |
| |
| /* We'll need the vcpu pointer */ |
| REST_GPR(4, r1) |
| |
| /* Jump back into the beginning of this function */ |
| b kvm_start_lightweight |
| |
