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162 lines
4.1 KiB
162 lines
4.1 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/mmu.h> |
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#include <asm/page.h> |
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#include <asm/asm-offsets.h> |
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#include <asm/asm-compat.h> |
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#ifdef CONFIG_PPC_BOOK3S_64 |
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#include <asm/exception-64s.h> |
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#endif |
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/***************************************************************************** |
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* * |
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* Real Mode handlers that need to be in low physical memory * |
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* * |
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****************************************************************************/ |
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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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#elif defined(CONFIG_PPC_BOOK3S_32) |
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#define FUNC(name) name |
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#define RFI_TO_KERNEL rfi |
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#define RFI_TO_GUEST rfi |
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.macro INTERRUPT_TRAMPOLINE intno |
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.global kvmppc_trampoline_\intno |
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kvmppc_trampoline_\intno: |
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mtspr SPRN_SPRG_SCRATCH0, r13 /* Save r13 */ |
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/* |
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* First thing to do is to find out if we're coming |
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* from a KVM guest or a Linux process. |
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* |
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* To distinguish, we check a magic byte in the PACA/current |
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*/ |
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mfspr r13, SPRN_SPRG_THREAD |
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lwz r13, THREAD_KVM_SVCPU(r13) |
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/* PPC32 can have a NULL pointer - let's check for that */ |
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mtspr SPRN_SPRG_SCRATCH1, r12 /* Save r12 */ |
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mfcr r12 |
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cmpwi r13, 0 |
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bne 1f |
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2: mtcr r12 |
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mfspr r12, SPRN_SPRG_SCRATCH1 |
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mfspr r13, SPRN_SPRG_SCRATCH0 /* r13 = original r13 */ |
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b kvmppc_resume_\intno /* Get back original handler */ |
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1: tophys(r13, r13) |
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stw r12, HSTATE_SCRATCH1(r13) |
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mfspr r12, SPRN_SPRG_SCRATCH1 |
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stw r12, HSTATE_SCRATCH0(r13) |
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lbz r12, HSTATE_IN_GUEST(r13) |
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cmpwi r12, KVM_GUEST_MODE_NONE |
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bne ..kvmppc_handler_hasmagic_\intno |
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/* No KVM guest? Then jump back to the Linux handler! */ |
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lwz r12, HSTATE_SCRATCH1(r13) |
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b 2b |
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/* Now we know we're handling a KVM guest */ |
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..kvmppc_handler_hasmagic_\intno: |
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/* Should we just skip the faulting instruction? */ |
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cmpwi r12, KVM_GUEST_MODE_SKIP |
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beq kvmppc_handler_skip_ins |
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/* Let's store which interrupt we're handling */ |
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li r12, \intno |
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/* Jump into the SLB exit code that goes to the highmem handler */ |
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b kvmppc_handler_trampoline_exit |
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.endm |
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_SYSTEM_RESET |
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_MACHINE_CHECK |
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_DATA_STORAGE |
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_INST_STORAGE |
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_EXTERNAL |
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_ALIGNMENT |
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_PROGRAM |
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_FP_UNAVAIL |
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_DECREMENTER |
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_SYSCALL |
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_TRACE |
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_PERFMON |
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INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_ALTIVEC |
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/* |
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* Bring us back to the faulting code, but skip the |
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* faulting instruction. |
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* |
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* This is a generic exit path from the interrupt |
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* trampolines above. |
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* |
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* Input Registers: |
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* |
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* R12 = free |
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* R13 = Shadow VCPU (PACA) |
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* HSTATE.SCRATCH0 = guest R12 |
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* HSTATE.SCRATCH1 = guest CR |
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* SPRG_SCRATCH0 = guest R13 |
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* |
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*/ |
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kvmppc_handler_skip_ins: |
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/* Patch the IP to the next instruction */ |
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mfsrr0 r12 |
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addi r12, r12, 4 |
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mtsrr0 r12 |
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/* Clean up all state */ |
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lwz r12, HSTATE_SCRATCH1(r13) |
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mtcr r12 |
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PPC_LL r12, HSTATE_SCRATCH0(r13) |
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GET_SCRATCH0(r13) |
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/* And get back into the code */ |
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RFI_TO_KERNEL |
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#endif |
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/* |
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* Call kvmppc_handler_trampoline_enter in real mode |
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* |
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* On entry, r4 contains the guest shadow MSR |
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* MSR.EE has to be 0 when calling this function |
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*/ |
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_GLOBAL_TOC(kvmppc_entry_trampoline) |
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mfmsr r5 |
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LOAD_REG_ADDR(r7, kvmppc_handler_trampoline_enter) |
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toreal(r7) |
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li r6, MSR_IR | MSR_DR |
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andc r6, r5, r6 /* Clear DR and IR in MSR value */ |
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/* |
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* Set EE in HOST_MSR so that it's enabled when we get into our |
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* C exit handler function. |
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*/ |
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ori r5, r5, MSR_EE |
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mtsrr0 r7 |
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mtsrr1 r6 |
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RFI_TO_KERNEL |
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#include "book3s_segment.S"
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