1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * 4 * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> 5 * 6 * Derived from book3s_interrupts.S, which is: 7 * Copyright SUSE Linux Products GmbH 2009 8 * 9 * Authors: Alexander Graf <agraf@suse.de> 10 */ 11 12#include <asm/ppc_asm.h> 13#include <asm/kvm_asm.h> 14#include <asm/reg.h> 15#include <asm/page.h> 16#include <asm/asm-offsets.h> 17#include <asm/exception-64s.h> 18#include <asm/ppc-opcode.h> 19#include <asm/asm-compat.h> 20#include <asm/feature-fixups.h> 21 22/***************************************************************************** 23 * * 24 * Guest entry / exit code that is in kernel module memory (vmalloc) * 25 * * 26 ****************************************************************************/ 27 28/* Registers: 29 * none 30 */ 31_GLOBAL(__kvmppc_vcore_entry) 32 33 /* Write correct stack frame */ 34 mflr r0 35 std r0,PPC_LR_STKOFF(r1) 36 37 /* Save host state to the stack */ 38 stdu r1, -SWITCH_FRAME_SIZE(r1) 39 40 /* Save non-volatile registers (r14 - r31) and CR */ 41 SAVE_NVGPRS(r1) 42 mfcr r3 43 std r3, _CCR(r1) 44 45 /* Save host DSCR */ 46 mfspr r3, SPRN_DSCR 47 std r3, HSTATE_DSCR(r13) 48 49BEGIN_FTR_SECTION 50 /* Save host DABR */ 51 mfspr r3, SPRN_DABR 52 std r3, HSTATE_DABR(r13) 53END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) 54 55 /* Save host PMU registers */ 56 bl kvmhv_save_host_pmu 57 58 /* 59 * Put whatever is in the decrementer into the 60 * hypervisor decrementer. 61 */ 62BEGIN_FTR_SECTION 63 ld r5, HSTATE_KVM_VCORE(r13) 64 ld r6, VCORE_KVM(r5) 65 ld r9, KVM_HOST_LPCR(r6) 66 andis. r9, r9, LPCR_LD@h 67END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) 68 mfspr r8,SPRN_DEC 69 mftb r7 70BEGIN_FTR_SECTION 71 /* On POWER9, don't sign-extend if host LPCR[LD] bit is set */ 72 bne 32f 73END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) 74 extsw r8,r8 7532: mtspr SPRN_HDEC,r8 76 add r8,r8,r7 77 std r8,HSTATE_DECEXP(r13) 78 79 /* Jump to partition switch code */ 80 bl kvmppc_hv_entry_trampoline 81 nop 82 83/* 84 * We return here in virtual mode after the guest exits 85 * with something that we can't handle in real mode. 86 * Interrupts are still hard-disabled. 87 */ 88 89 /* 90 * Register usage at this point: 91 * 92 * R1 = host R1 93 * R2 = host R2 94 * R3 = trap number on this thread 95 * R12 = exit handler id 96 * R13 = PACA 97 */ 98 99 /* Restore non-volatile host registers (r14 - r31) and CR */ 100 REST_NVGPRS(r1) 101 ld r4, _CCR(r1) 102 mtcr r4 103 104 addi r1, r1, SWITCH_FRAME_SIZE 105 ld r0, PPC_LR_STKOFF(r1) 106 mtlr r0 107 blr 108 109_GLOBAL(kvmhv_save_host_pmu) 110BEGIN_FTR_SECTION 111 /* Work around P8 PMAE bug */ 112 li r3, -1 113 clrrdi r3, r3, 10 114 mfspr r8, SPRN_MMCR2 115 mtspr SPRN_MMCR2, r3 /* freeze all counters using MMCR2 */ 116 isync 117END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) 118 li r3, 1 119 sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */ 120 mfspr r7, SPRN_MMCR0 /* save MMCR0 */ 121 mtspr SPRN_MMCR0, r3 /* freeze all counters, disable interrupts */ 122 mfspr r6, SPRN_MMCRA 123 /* Clear MMCRA in order to disable SDAR updates */ 124 li r5, 0 125 mtspr SPRN_MMCRA, r5 126 isync 127 lbz r5, PACA_PMCINUSE(r13) /* is the host using the PMU? */ 128 cmpwi r5, 0 129 beq 31f /* skip if not */ 130 mfspr r5, SPRN_MMCR1 131 mfspr r9, SPRN_SIAR 132 mfspr r10, SPRN_SDAR 133 std r7, HSTATE_MMCR0(r13) 134 std r5, HSTATE_MMCR1(r13) 135 std r6, HSTATE_MMCRA(r13) 136 std r9, HSTATE_SIAR(r13) 137 std r10, HSTATE_SDAR(r13) 138BEGIN_FTR_SECTION 139 mfspr r9, SPRN_SIER 140 std r8, HSTATE_MMCR2(r13) 141 std r9, HSTATE_SIER(r13) 142END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) 143 mfspr r3, SPRN_PMC1 144 mfspr r5, SPRN_PMC2 145 mfspr r6, SPRN_PMC3 146 mfspr r7, SPRN_PMC4 147 mfspr r8, SPRN_PMC5 148 mfspr r9, SPRN_PMC6 149 stw r3, HSTATE_PMC1(r13) 150 stw r5, HSTATE_PMC2(r13) 151 stw r6, HSTATE_PMC3(r13) 152 stw r7, HSTATE_PMC4(r13) 153 stw r8, HSTATE_PMC5(r13) 154 stw r9, HSTATE_PMC6(r13) 15531: blr 156