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 49 BEGIN_FTR_SECTION 50 /* Save host DABR */ 51 mfspr r3, SPRN_DABR 52 std r3, HSTATE_DABR(r13) 53 END_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 * Because of a hardware deviation in P8 and P9, 62 * we need to set LPCR[HDICE] before writing HDEC. 63 */ 64 ld r5, HSTATE_KVM_VCORE(r13) 65 ld r6, VCORE_KVM(r5) 66 ld r9, KVM_HOST_LPCR(r6) 67 ori r8, r9, LPCR_HDICE 68 mtspr SPRN_LPCR, r8 69 isync 70 andis. r0, r9, LPCR_LD@h 71 mfspr r8,SPRN_DEC 72 mftb r7 73 BEGIN_FTR_SECTION 74 /* On POWER9, don't sign-extend if host LPCR[LD] bit is set */ 75 bne 32f 76 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) 77 extsw r8,r8 78 32: mtspr SPRN_HDEC,r8 79 add r8,r8,r7 80 std r8,HSTATE_DECEXP(r13) 81 82 /* Jump to partition switch code */ 83 bl kvmppc_hv_entry_trampoline 84 nop 85 86 /* 87 * We return here in virtual mode after the guest exits 88 * with something that we can't handle in real mode. 89 * Interrupts are still hard-disabled. 90 */ 91 92 /* 93 * Register usage at this point: 94 * 95 * R1 = host R1 96 * R2 = host R2 97 * R3 = trap number on this thread 98 * R12 = exit handler id 99 * R13 = PACA 100 */ 101 102 /* Restore non-volatile host registers (r14 - r31) and CR */ 103 REST_NVGPRS(r1) 104 ld r4, _CCR(r1) 105 mtcr r4 106 107 addi r1, r1, SWITCH_FRAME_SIZE 108 ld r0, PPC_LR_STKOFF(r1) 109 mtlr r0 110 blr 111 112 _GLOBAL(kvmhv_save_host_pmu) 113 BEGIN_FTR_SECTION 114 /* Work around P8 PMAE bug */ 115 li r3, -1 116 clrrdi r3, r3, 10 117 mfspr r8, SPRN_MMCR2 118 mtspr SPRN_MMCR2, r3 /* freeze all counters using MMCR2 */ 119 isync 120 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) 121 li r3, 1 122 sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */ 123 mfspr r7, SPRN_MMCR0 /* save MMCR0 */ 124 mtspr SPRN_MMCR0, r3 /* freeze all counters, disable interrupts */ 125 mfspr r6, SPRN_MMCRA 126 /* Clear MMCRA in order to disable SDAR updates */ 127 li r5, 0 128 mtspr SPRN_MMCRA, r5 129 isync 130 lbz r5, PACA_PMCINUSE(r13) /* is the host using the PMU? */ 131 cmpwi r5, 0 132 beq 31f /* skip if not */ 133 mfspr r5, SPRN_MMCR1 134 mfspr r9, SPRN_SIAR 135 mfspr r10, SPRN_SDAR 136 std r7, HSTATE_MMCR0(r13) 137 std r5, HSTATE_MMCR1(r13) 138 std r6, HSTATE_MMCRA(r13) 139 std r9, HSTATE_SIAR(r13) 140 std r10, HSTATE_SDAR(r13) 141 BEGIN_FTR_SECTION 142 mfspr r9, SPRN_SIER 143 std r8, HSTATE_MMCR2(r13) 144 std r9, HSTATE_SIER(r13) 145 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) 146 BEGIN_FTR_SECTION 147 mfspr r5, SPRN_MMCR3 148 mfspr r6, SPRN_SIER2 149 mfspr r7, SPRN_SIER3 150 std r5, HSTATE_MMCR3(r13) 151 std r6, HSTATE_SIER2(r13) 152 std r7, HSTATE_SIER3(r13) 153 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_31) 154 mfspr r3, SPRN_PMC1 155 mfspr r5, SPRN_PMC2 156 mfspr r6, SPRN_PMC3 157 mfspr r7, SPRN_PMC4 158 mfspr r8, SPRN_PMC5 159 mfspr r9, SPRN_PMC6 160 stw r3, HSTATE_PMC1(r13) 161 stw r5, HSTATE_PMC2(r13) 162 stw r6, HSTATE_PMC3(r13) 163 stw r7, HSTATE_PMC4(r13) 164 stw r8, HSTATE_PMC5(r13) 165 stw r9, HSTATE_PMC6(r13) 166 31: blr 167