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 <linux/linkage.h> 13 #include <asm/ppc_asm.h> 14 #include <asm/kvm_asm.h> 15 #include <asm/reg.h> 16 #include <asm/page.h> 17 #include <asm/asm-offsets.h> 18 #include <asm/exception-64s.h> 19 #include <asm/ppc-opcode.h> 20 #include <asm/asm-compat.h> 21 #include <asm/feature-fixups.h> 22 23 /***************************************************************************** 24 * * 25 * Guest entry / exit code that is in kernel module memory (vmalloc) * 26 * * 27 ****************************************************************************/ 28 29 /* Registers: 30 * none 31 */ 32 _GLOBAL(__kvmppc_vcore_entry) 33 34 /* Write correct stack frame */ 35 mflr r0 36 std r0,PPC_LR_STKOFF(r1) 37 38 /* Save host state to the stack */ 39 stdu r1, -SWITCH_FRAME_SIZE(r1) 40 41 /* Save non-volatile registers (r14 - r31) and CR */ 42 SAVE_NVGPRS(r1) 43 mfcr r3 44 std r3, _CCR(r1) 45 46 /* Save host DSCR */ 47 mfspr r3, SPRN_DSCR 48 std r3, HSTATE_DSCR(r13) 49 50 BEGIN_FTR_SECTION 51 /* Save host DABR */ 52 mfspr r3, SPRN_DABR 53 std r3, HSTATE_DABR(r13) 54 END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) 55 56 /* Save host PMU registers */ 57 bl kvmhv_save_host_pmu 58 59 /* 60 * Put whatever is in the decrementer into the 61 * hypervisor decrementer. 62 * Because of a hardware deviation in P8, 63 * we need to set LPCR[HDICE] before writing HDEC. 64 */ 65 ld r5, HSTATE_KVM_VCORE(r13) 66 ld r6, VCORE_KVM(r5) 67 ld r9, KVM_HOST_LPCR(r6) 68 ori r8, r9, LPCR_HDICE 69 mtspr SPRN_LPCR, r8 70 isync 71 mfspr r8,SPRN_DEC 72 mftb r7 73 extsw r8,r8 74 mtspr SPRN_HDEC,r8 75 add r8,r8,r7 76 std r8,HSTATE_DECEXP(r13) 77 78 /* Jump to partition switch code */ 79 bl kvmppc_hv_entry_trampoline 80 nop 81 82 /* 83 * We return here in virtual mode after the guest exits 84 * with something that we can't handle in real mode. 85 * Interrupts are still hard-disabled. 86 */ 87 88 /* 89 * Register usage at this point: 90 * 91 * R1 = host R1 92 * R2 = host R2 93 * R3 = trap number on this thread 94 * R12 = exit handler id 95 * R13 = PACA 96 */ 97 98 /* Restore non-volatile host registers (r14 - r31) and CR */ 99 REST_NVGPRS(r1) 100 ld r4, _CCR(r1) 101 mtcr r4 102 103 addi r1, r1, SWITCH_FRAME_SIZE 104 ld r0, PPC_LR_STKOFF(r1) 105 mtlr r0 106 blr 107 108 /* 109 * void kvmhv_save_host_pmu(void) 110 */ 111 SYM_FUNC_START_LOCAL(kvmhv_save_host_pmu) 112 BEGIN_FTR_SECTION 113 /* Work around P8 PMAE bug */ 114 li r3, -1 115 clrrdi r3, r3, 10 116 mfspr r8, SPRN_MMCR2 117 mtspr SPRN_MMCR2, r3 /* freeze all counters using MMCR2 */ 118 isync 119 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) 120 li r3, 1 121 sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */ 122 mfspr r7, SPRN_MMCR0 /* save MMCR0 */ 123 mtspr SPRN_MMCR0, r3 /* freeze all counters, disable interrupts */ 124 mfspr r6, SPRN_MMCRA 125 /* Clear MMCRA in order to disable SDAR updates */ 126 li r5, 0 127 mtspr SPRN_MMCRA, r5 128 isync 129 lbz r5, PACA_PMCINUSE(r13) /* is the host using the PMU? */ 130 cmpwi r5, 0 131 beq 31f /* skip if not */ 132 mfspr r5, SPRN_MMCR1 133 mfspr r9, SPRN_SIAR 134 mfspr r10, SPRN_SDAR 135 std r7, HSTATE_MMCR0(r13) 136 std r5, HSTATE_MMCR1(r13) 137 std r6, HSTATE_MMCRA(r13) 138 std r9, HSTATE_SIAR(r13) 139 std r10, HSTATE_SDAR(r13) 140 BEGIN_FTR_SECTION 141 mfspr r9, SPRN_SIER 142 std r8, HSTATE_MMCR2(r13) 143 std r9, HSTATE_SIER(r13) 144 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) 145 mfspr r3, SPRN_PMC1 146 mfspr r5, SPRN_PMC2 147 mfspr r6, SPRN_PMC3 148 mfspr r7, SPRN_PMC4 149 mfspr r8, SPRN_PMC5 150 mfspr r9, SPRN_PMC6 151 stw r3, HSTATE_PMC1(r13) 152 stw r5, HSTATE_PMC2(r13) 153 stw r6, HSTATE_PMC3(r13) 154 stw r7, HSTATE_PMC4(r13) 155 stw r8, HSTATE_PMC5(r13) 156 stw r9, HSTATE_PMC6(r13) 157 31: blr 158 SYM_FUNC_END(kvmhv_save_host_pmu)
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