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239 lines
5.5 KiB
239 lines
5.5 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* |
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* Copyright SUSE Linux Products GmbH 2009 |
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* |
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* Authors: Alexander Graf <agraf@suse.de> |
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*/ |
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#include <asm/ppc_asm.h> |
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#include <asm/kvm_asm.h> |
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#include <asm/reg.h> |
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#include <asm/page.h> |
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#include <asm/asm-offsets.h> |
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#include <asm/exception-64s.h> |
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#include <asm/asm-compat.h> |
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#if defined(CONFIG_PPC_BOOK3S_64) |
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#ifdef PPC64_ELF_ABI_v2 |
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#define FUNC(name) name |
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#else |
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#define FUNC(name) GLUE(.,name) |
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#endif |
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#define GET_SHADOW_VCPU(reg) addi reg, r13, PACA_SVCPU |
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#elif defined(CONFIG_PPC_BOOK3S_32) |
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#define FUNC(name) name |
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#define GET_SHADOW_VCPU(reg) lwz reg, (THREAD + THREAD_KVM_SVCPU)(r2) |
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#endif /* CONFIG_PPC_BOOK3S_64 */ |
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#define VCPU_LOAD_NVGPRS(vcpu) \ |
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PPC_LL r14, VCPU_GPR(R14)(vcpu); \ |
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PPC_LL r15, VCPU_GPR(R15)(vcpu); \ |
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PPC_LL r16, VCPU_GPR(R16)(vcpu); \ |
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PPC_LL r17, VCPU_GPR(R17)(vcpu); \ |
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PPC_LL r18, VCPU_GPR(R18)(vcpu); \ |
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PPC_LL r19, VCPU_GPR(R19)(vcpu); \ |
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PPC_LL r20, VCPU_GPR(R20)(vcpu); \ |
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PPC_LL r21, VCPU_GPR(R21)(vcpu); \ |
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PPC_LL r22, VCPU_GPR(R22)(vcpu); \ |
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PPC_LL r23, VCPU_GPR(R23)(vcpu); \ |
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PPC_LL r24, VCPU_GPR(R24)(vcpu); \ |
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PPC_LL r25, VCPU_GPR(R25)(vcpu); \ |
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PPC_LL r26, VCPU_GPR(R26)(vcpu); \ |
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PPC_LL r27, VCPU_GPR(R27)(vcpu); \ |
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PPC_LL r28, VCPU_GPR(R28)(vcpu); \ |
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PPC_LL r29, VCPU_GPR(R29)(vcpu); \ |
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PPC_LL r30, VCPU_GPR(R30)(vcpu); \ |
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PPC_LL r31, VCPU_GPR(R31)(vcpu); \ |
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/***************************************************************************** |
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* * |
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* Guest entry / exit code that is in kernel module memory (highmem) * |
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* * |
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****************************************************************************/ |
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/* Registers: |
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* r3: vcpu pointer |
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*/ |
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_GLOBAL(__kvmppc_vcpu_run) |
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kvm_start_entry: |
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/* Write correct stack frame */ |
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mflr r0 |
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PPC_STL r0,PPC_LR_STKOFF(r1) |
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/* Save host state to the stack */ |
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PPC_STLU r1, -SWITCH_FRAME_SIZE(r1) |
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/* Save r3 (vcpu) */ |
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SAVE_GPR(3, r1) |
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/* Save non-volatile registers (r14 - r31) */ |
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SAVE_NVGPRS(r1) |
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/* Save CR */ |
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mfcr r14 |
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stw r14, _CCR(r1) |
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/* Save LR */ |
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PPC_STL r0, _LINK(r1) |
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/* Load non-volatile guest state from the vcpu */ |
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VCPU_LOAD_NVGPRS(r3) |
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kvm_start_lightweight: |
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/* Copy registers into shadow vcpu so we can access them in real mode */ |
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bl FUNC(kvmppc_copy_to_svcpu) |
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nop |
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REST_GPR(3, r1) |
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#ifdef CONFIG_PPC_BOOK3S_64 |
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/* Get the dcbz32 flag */ |
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PPC_LL r0, VCPU_HFLAGS(r3) |
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rldicl r0, r0, 0, 63 /* r3 &= 1 */ |
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stb r0, HSTATE_RESTORE_HID5(r13) |
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/* Load up guest SPRG3 value, since it's user readable */ |
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lbz r4, VCPU_SHAREDBE(r3) |
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cmpwi r4, 0 |
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ld r5, VCPU_SHARED(r3) |
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beq sprg3_little_endian |
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sprg3_big_endian: |
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#ifdef __BIG_ENDIAN__ |
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ld r4, VCPU_SHARED_SPRG3(r5) |
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#else |
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addi r5, r5, VCPU_SHARED_SPRG3 |
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ldbrx r4, 0, r5 |
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#endif |
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b after_sprg3_load |
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sprg3_little_endian: |
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#ifdef __LITTLE_ENDIAN__ |
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ld r4, VCPU_SHARED_SPRG3(r5) |
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#else |
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addi r5, r5, VCPU_SHARED_SPRG3 |
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ldbrx r4, 0, r5 |
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#endif |
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after_sprg3_load: |
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mtspr SPRN_SPRG3, r4 |
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#endif /* CONFIG_PPC_BOOK3S_64 */ |
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PPC_LL r4, VCPU_SHADOW_MSR(r3) /* get shadow_msr */ |
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/* Jump to segment patching handler and into our guest */ |
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bl FUNC(kvmppc_entry_trampoline) |
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nop |
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/* |
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* This is the handler in module memory. It gets jumped at from the |
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* lowmem trampoline code, so it's basically the guest exit code. |
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* |
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*/ |
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/* |
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* Register usage at this point: |
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* |
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* R1 = host R1 |
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* R2 = host R2 |
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* R12 = exit handler id |
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* R13 = PACA |
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* SVCPU.* = guest * |
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* MSR.EE = 1 |
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* |
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*/ |
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PPC_LL r3, GPR3(r1) /* vcpu pointer */ |
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/* |
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* kvmppc_copy_from_svcpu can clobber volatile registers, save |
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* the exit handler id to the vcpu and restore it from there later. |
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*/ |
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stw r12, VCPU_TRAP(r3) |
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/* Transfer reg values from shadow vcpu back to vcpu struct */ |
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bl FUNC(kvmppc_copy_from_svcpu) |
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nop |
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#ifdef CONFIG_PPC_BOOK3S_64 |
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/* |
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* Reload kernel SPRG3 value. |
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* No need to save guest value as usermode can't modify SPRG3. |
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*/ |
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ld r3, PACA_SPRG_VDSO(r13) |
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mtspr SPRN_SPRG_VDSO_WRITE, r3 |
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#endif /* CONFIG_PPC_BOOK3S_64 */ |
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/* R7 = vcpu */ |
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PPC_LL r7, GPR3(r1) |
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PPC_STL r14, VCPU_GPR(R14)(r7) |
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PPC_STL r15, VCPU_GPR(R15)(r7) |
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PPC_STL r16, VCPU_GPR(R16)(r7) |
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PPC_STL r17, VCPU_GPR(R17)(r7) |
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PPC_STL r18, VCPU_GPR(R18)(r7) |
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PPC_STL r19, VCPU_GPR(R19)(r7) |
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PPC_STL r20, VCPU_GPR(R20)(r7) |
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PPC_STL r21, VCPU_GPR(R21)(r7) |
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PPC_STL r22, VCPU_GPR(R22)(r7) |
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PPC_STL r23, VCPU_GPR(R23)(r7) |
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PPC_STL r24, VCPU_GPR(R24)(r7) |
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PPC_STL r25, VCPU_GPR(R25)(r7) |
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PPC_STL r26, VCPU_GPR(R26)(r7) |
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PPC_STL r27, VCPU_GPR(R27)(r7) |
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PPC_STL r28, VCPU_GPR(R28)(r7) |
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PPC_STL r29, VCPU_GPR(R29)(r7) |
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PPC_STL r30, VCPU_GPR(R30)(r7) |
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PPC_STL r31, VCPU_GPR(R31)(r7) |
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/* Pass the exit number as 2nd argument to kvmppc_handle_exit */ |
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lwz r4, VCPU_TRAP(r7) |
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/* Restore r3 (vcpu) */ |
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REST_GPR(3, r1) |
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bl FUNC(kvmppc_handle_exit_pr) |
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/* If RESUME_GUEST, get back in the loop */ |
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cmpwi r3, RESUME_GUEST |
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beq kvm_loop_lightweight |
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cmpwi r3, RESUME_GUEST_NV |
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beq kvm_loop_heavyweight |
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kvm_exit_loop: |
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PPC_LL r4, _LINK(r1) |
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mtlr r4 |
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lwz r14, _CCR(r1) |
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mtcr r14 |
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/* Restore non-volatile host registers (r14 - r31) */ |
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REST_NVGPRS(r1) |
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addi r1, r1, SWITCH_FRAME_SIZE |
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blr |
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kvm_loop_heavyweight: |
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PPC_LL r4, _LINK(r1) |
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PPC_STL r4, (PPC_LR_STKOFF + SWITCH_FRAME_SIZE)(r1) |
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/* Load vcpu */ |
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REST_GPR(3, r1) |
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/* Load non-volatile guest state from the vcpu */ |
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VCPU_LOAD_NVGPRS(r3) |
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/* Jump back into the beginning of this function */ |
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b kvm_start_lightweight |
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kvm_loop_lightweight: |
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/* We'll need the vcpu pointer */ |
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REST_GPR(3, r1) |
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/* Jump back into the beginning of this function */ |
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b kvm_start_lightweight
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