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/* SPDX-License-Identifier: GPL-2.0-only */
/*
*
* 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/mmu.h>
#include <asm/page.h>
#include <asm/asm-offsets.h>
#include <asm/asm-compat.h>
#ifdef CONFIG_PPC_BOOK3S_64
#include <asm/exception-64s.h>
#endif
/*****************************************************************************
* *
* Real Mode handlers that need to be in low physical memory *
* *
****************************************************************************/
#if defined(CONFIG_PPC_BOOK3S_64)
#ifdef PPC64_ELF_ABI_v2
#define FUNC(name) name
#else
#define FUNC(name) GLUE(.,name)
#endif
#elif defined(CONFIG_PPC_BOOK3S_32)
#define FUNC(name) name
#define RFI_TO_KERNEL RFI
#define RFI_TO_GUEST RFI
.macro INTERRUPT_TRAMPOLINE intno
.global kvmppc_trampoline_\intno
kvmppc_trampoline_\intno:
mtspr SPRN_SPRG_SCRATCH0, r13 /* Save r13 */
/*
* First thing to do is to find out if we're coming
* from a KVM guest or a Linux process.
*
* To distinguish, we check a magic byte in the PACA/current
*/
mfspr r13, SPRN_SPRG_THREAD
lwz r13, THREAD_KVM_SVCPU(r13)
/* PPC32 can have a NULL pointer - let's check for that */
mtspr SPRN_SPRG_SCRATCH1, r12 /* Save r12 */
mfcr r12
cmpwi r13, 0
bne 1f
2: mtcr r12
mfspr r12, SPRN_SPRG_SCRATCH1
mfspr r13, SPRN_SPRG_SCRATCH0 /* r13 = original r13 */
b kvmppc_resume_\intno /* Get back original handler */
1: tophys(r13, r13)
stw r12, HSTATE_SCRATCH1(r13)
mfspr r12, SPRN_SPRG_SCRATCH1
stw r12, HSTATE_SCRATCH0(r13)
lbz r12, HSTATE_IN_GUEST(r13)
cmpwi r12, KVM_GUEST_MODE_NONE
bne ..kvmppc_handler_hasmagic_\intno
/* No KVM guest? Then jump back to the Linux handler! */
lwz r12, HSTATE_SCRATCH1(r13)
b 2b
/* Now we know we're handling a KVM guest */
..kvmppc_handler_hasmagic_\intno:
/* Should we just skip the faulting instruction? */
cmpwi r12, KVM_GUEST_MODE_SKIP
beq kvmppc_handler_skip_ins
/* Let's store which interrupt we're handling */
li r12, \intno
/* Jump into the SLB exit code that goes to the highmem handler */
b kvmppc_handler_trampoline_exit
.endm
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_SYSTEM_RESET
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_MACHINE_CHECK
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_DATA_STORAGE
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_INST_STORAGE
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_EXTERNAL
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_ALIGNMENT
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_PROGRAM
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_FP_UNAVAIL
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_DECREMENTER
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_SYSCALL
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_TRACE
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_PERFMON
INTERRUPT_TRAMPOLINE BOOK3S_INTERRUPT_ALTIVEC
/*
* Bring us back to the faulting code, but skip the
* faulting instruction.
*
* This is a generic exit path from the interrupt
* trampolines above.
*
* Input Registers:
*
* R12 = free
* R13 = Shadow VCPU (PACA)
* HSTATE.SCRATCH0 = guest R12
* HSTATE.SCRATCH1 = guest CR
* SPRG_SCRATCH0 = guest R13
*
*/
kvmppc_handler_skip_ins:
/* Patch the IP to the next instruction */
mfsrr0 r12
addi r12, r12, 4
mtsrr0 r12
/* Clean up all state */
lwz r12, HSTATE_SCRATCH1(r13)
mtcr r12
PPC_LL r12, HSTATE_SCRATCH0(r13)
GET_SCRATCH0(r13)
/* And get back into the code */
RFI_TO_KERNEL
#endif
/*
* Call kvmppc_handler_trampoline_enter in real mode
*
* On entry, r4 contains the guest shadow MSR
* MSR.EE has to be 0 when calling this function
*/
_GLOBAL_TOC(kvmppc_entry_trampoline)
mfmsr r5
LOAD_REG_ADDR(r7, kvmppc_handler_trampoline_enter)
toreal(r7)
li r6, MSR_IR | MSR_DR
andc r6, r5, r6 /* Clear DR and IR in MSR value */
/*
* Set EE in HOST_MSR so that it's enabled when we get into our
* C exit handler function.
*/
ori r5, r5, MSR_EE
mtsrr0 r7
mtsrr1 r6
RFI_TO_KERNEL
#include "book3s_segment.S"
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