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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 | /* 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 CONFIG_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 */ /* Note that prefixed instructions are disabled in PR KVM for now */ 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" |