1/* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License, version 2, as 4 * published by the Free Software Foundation. 5 * 6 * This program is distributed in the hope that it will be useful, 7 * but WITHOUT ANY WARRANTY; without even the implied warranty of 8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 9 * GNU General Public License for more details. 10 * 11 * You should have received a copy of the GNU General Public License 12 * along with this program; if not, write to the Free Software 13 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 14 * 15 * Copyright SUSE Linux Products GmbH 2009 16 * 17 * Authors: Alexander Graf <agraf@suse.de> 18 */ 19 20#include <asm/ppc_asm.h> 21#include <asm/kvm_asm.h> 22#include <asm/reg.h> 23#include <asm/page.h> 24#include <asm/asm-offsets.h> 25#include <asm/exception-64s.h> 26 27#if defined(CONFIG_PPC_BOOK3S_64) 28#define FUNC(name) GLUE(.,name) 29#elif defined(CONFIG_PPC_BOOK3S_32) 30#define FUNC(name) name 31#endif /* CONFIG_PPC_BOOK3S_XX */ 32 33#define VCPU_LOAD_NVGPRS(vcpu) \ 34 PPC_LL r14, VCPU_GPR(R14)(vcpu); \ 35 PPC_LL r15, VCPU_GPR(R15)(vcpu); \ 36 PPC_LL r16, VCPU_GPR(R16)(vcpu); \ 37 PPC_LL r17, VCPU_GPR(R17)(vcpu); \ 38 PPC_LL r18, VCPU_GPR(R18)(vcpu); \ 39 PPC_LL r19, VCPU_GPR(R19)(vcpu); \ 40 PPC_LL r20, VCPU_GPR(R20)(vcpu); \ 41 PPC_LL r21, VCPU_GPR(R21)(vcpu); \ 42 PPC_LL r22, VCPU_GPR(R22)(vcpu); \ 43 PPC_LL r23, VCPU_GPR(R23)(vcpu); \ 44 PPC_LL r24, VCPU_GPR(R24)(vcpu); \ 45 PPC_LL r25, VCPU_GPR(R25)(vcpu); \ 46 PPC_LL r26, VCPU_GPR(R26)(vcpu); \ 47 PPC_LL r27, VCPU_GPR(R27)(vcpu); \ 48 PPC_LL r28, VCPU_GPR(R28)(vcpu); \ 49 PPC_LL r29, VCPU_GPR(R29)(vcpu); \ 50 PPC_LL r30, VCPU_GPR(R30)(vcpu); \ 51 PPC_LL r31, VCPU_GPR(R31)(vcpu); \ 52 53/***************************************************************************** 54 * * 55 * Guest entry / exit code that is in kernel module memory (highmem) * 56 * * 57 ****************************************************************************/ 58 59/* Registers: 60 * r3: kvm_run pointer 61 * r4: vcpu pointer 62 */ 63_GLOBAL(__kvmppc_vcpu_run) 64 65kvm_start_entry: 66 /* Write correct stack frame */ 67 mflr r0 68 PPC_STL r0,PPC_LR_STKOFF(r1) 69 70 /* Save host state to the stack */ 71 PPC_STLU r1, -SWITCH_FRAME_SIZE(r1) 72 73 /* Save r3 (kvm_run) and r4 (vcpu) */ 74 SAVE_2GPRS(3, r1) 75 76 /* Save non-volatile registers (r14 - r31) */ 77 SAVE_NVGPRS(r1) 78 79 /* Save CR */ 80 mfcr r14 81 stw r14, _CCR(r1) 82 83 /* Save LR */ 84 PPC_STL r0, _LINK(r1) 85 86 /* Load non-volatile guest state from the vcpu */ 87 VCPU_LOAD_NVGPRS(r4) 88 89kvm_start_lightweight: 90 91#ifdef CONFIG_PPC_BOOK3S_64 92 PPC_LL r3, VCPU_HFLAGS(r4) 93 rldicl r3, r3, 0, 63 /* r3 &= 1 */ 94 stb r3, HSTATE_RESTORE_HID5(r13) 95#endif /* CONFIG_PPC_BOOK3S_64 */ 96 97 PPC_LL r4, VCPU_SHADOW_MSR(r4) /* get shadow_msr */ 98 99 /* Jump to segment patching handler and into our guest */ 100 bl FUNC(kvmppc_entry_trampoline) 101 nop 102 103/* 104 * This is the handler in module memory. It gets jumped at from the 105 * lowmem trampoline code, so it's basically the guest exit code. 106 * 107 */ 108 109.global kvmppc_handler_highmem 110kvmppc_handler_highmem: 111 112 /* 113 * Register usage at this point: 114 * 115 * R1 = host R1 116 * R2 = host R2 117 * R12 = exit handler id 118 * R13 = PACA 119 * SVCPU.* = guest * 120 * 121 */ 122 123 /* R7 = vcpu */ 124 PPC_LL r7, GPR4(r1) 125 126 PPC_STL r14, VCPU_GPR(R14)(r7) 127 PPC_STL r15, VCPU_GPR(R15)(r7) 128 PPC_STL r16, VCPU_GPR(R16)(r7) 129 PPC_STL r17, VCPU_GPR(R17)(r7) 130 PPC_STL r18, VCPU_GPR(R18)(r7) 131 PPC_STL r19, VCPU_GPR(R19)(r7) 132 PPC_STL r20, VCPU_GPR(R20)(r7) 133 PPC_STL r21, VCPU_GPR(R21)(r7) 134 PPC_STL r22, VCPU_GPR(R22)(r7) 135 PPC_STL r23, VCPU_GPR(R23)(r7) 136 PPC_STL r24, VCPU_GPR(R24)(r7) 137 PPC_STL r25, VCPU_GPR(R25)(r7) 138 PPC_STL r26, VCPU_GPR(R26)(r7) 139 PPC_STL r27, VCPU_GPR(R27)(r7) 140 PPC_STL r28, VCPU_GPR(R28)(r7) 141 PPC_STL r29, VCPU_GPR(R29)(r7) 142 PPC_STL r30, VCPU_GPR(R30)(r7) 143 PPC_STL r31, VCPU_GPR(R31)(r7) 144 145 /* Pass the exit number as 3rd argument to kvmppc_handle_exit */ 146 mr r5, r12 147 148 /* Restore r3 (kvm_run) and r4 (vcpu) */ 149 REST_2GPRS(3, r1) 150 bl FUNC(kvmppc_handle_exit) 151 152 /* If RESUME_GUEST, get back in the loop */ 153 cmpwi r3, RESUME_GUEST 154 beq kvm_loop_lightweight 155 156 cmpwi r3, RESUME_GUEST_NV 157 beq kvm_loop_heavyweight 158 159kvm_exit_loop: 160 161 PPC_LL r4, _LINK(r1) 162 mtlr r4 163 164 lwz r14, _CCR(r1) 165 mtcr r14 166 167 /* Restore non-volatile host registers (r14 - r31) */ 168 REST_NVGPRS(r1) 169 170 addi r1, r1, SWITCH_FRAME_SIZE 171 blr 172 173kvm_loop_heavyweight: 174 175 PPC_LL r4, _LINK(r1) 176 PPC_STL r4, (PPC_LR_STKOFF + SWITCH_FRAME_SIZE)(r1) 177 178 /* Load vcpu and cpu_run */ 179 REST_2GPRS(3, r1) 180 181 /* Load non-volatile guest state from the vcpu */ 182 VCPU_LOAD_NVGPRS(r4) 183 184 /* Jump back into the beginning of this function */ 185 b kvm_start_lightweight 186 187kvm_loop_lightweight: 188 189 /* We'll need the vcpu pointer */ 190 REST_GPR(4, r1) 191 192 /* Jump back into the beginning of this function */ 193 b kvm_start_lightweight 194