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#define GET_SHADOW_VCPU(reg) addi reg, r13, PACA_SVCPU 30 31#elif defined(CONFIG_PPC_BOOK3S_32) 32#define FUNC(name) name 33#define GET_SHADOW_VCPU(reg) lwz reg, (THREAD + THREAD_KVM_SVCPU)(r2) 34 35#endif /* CONFIG_PPC_BOOK3S_XX */ 36 37#define VCPU_LOAD_NVGPRS(vcpu) \ 38 PPC_LL r14, VCPU_GPR(R14)(vcpu); \ 39 PPC_LL r15, VCPU_GPR(R15)(vcpu); \ 40 PPC_LL r16, VCPU_GPR(R16)(vcpu); \ 41 PPC_LL r17, VCPU_GPR(R17)(vcpu); \ 42 PPC_LL r18, VCPU_GPR(R18)(vcpu); \ 43 PPC_LL r19, VCPU_GPR(R19)(vcpu); \ 44 PPC_LL r20, VCPU_GPR(R20)(vcpu); \ 45 PPC_LL r21, VCPU_GPR(R21)(vcpu); \ 46 PPC_LL r22, VCPU_GPR(R22)(vcpu); \ 47 PPC_LL r23, VCPU_GPR(R23)(vcpu); \ 48 PPC_LL r24, VCPU_GPR(R24)(vcpu); \ 49 PPC_LL r25, VCPU_GPR(R25)(vcpu); \ 50 PPC_LL r26, VCPU_GPR(R26)(vcpu); \ 51 PPC_LL r27, VCPU_GPR(R27)(vcpu); \ 52 PPC_LL r28, VCPU_GPR(R28)(vcpu); \ 53 PPC_LL r29, VCPU_GPR(R29)(vcpu); \ 54 PPC_LL r30, VCPU_GPR(R30)(vcpu); \ 55 PPC_LL r31, VCPU_GPR(R31)(vcpu); \ 56 57/***************************************************************************** 58 * * 59 * Guest entry / exit code that is in kernel module memory (highmem) * 60 * * 61 ****************************************************************************/ 62 63/* Registers: 64 * r3: kvm_run pointer 65 * r4: vcpu pointer 66 */ 67_GLOBAL(__kvmppc_vcpu_run) 68 69kvm_start_entry: 70 /* Write correct stack frame */ 71 mflr r0 72 PPC_STL r0,PPC_LR_STKOFF(r1) 73 74 /* Save host state to the stack */ 75 PPC_STLU r1, -SWITCH_FRAME_SIZE(r1) 76 77 /* Save r3 (kvm_run) and r4 (vcpu) */ 78 SAVE_2GPRS(3, r1) 79 80 /* Save non-volatile registers (r14 - r31) */ 81 SAVE_NVGPRS(r1) 82 83 /* Save CR */ 84 mfcr r14 85 stw r14, _CCR(r1) 86 87 /* Save LR */ 88 PPC_STL r0, _LINK(r1) 89 90 /* Load non-volatile guest state from the vcpu */ 91 VCPU_LOAD_NVGPRS(r4) 92 93kvm_start_lightweight: 94 /* Copy registers into shadow vcpu so we can access them in real mode */ 95 GET_SHADOW_VCPU(r3) 96 bl FUNC(kvmppc_copy_to_svcpu) 97 nop 98 REST_GPR(4, r1) 99 100#ifdef CONFIG_PPC_BOOK3S_64 101 /* Get the dcbz32 flag */ 102 PPC_LL r3, VCPU_HFLAGS(r4) 103 rldicl r3, r3, 0, 63 /* r3 &= 1 */ 104 stb r3, HSTATE_RESTORE_HID5(r13) 105 106 /* Load up guest SPRG3 value, since it's user readable */ 107 ld r3, VCPU_SHARED(r4) 108 ld r3, VCPU_SHARED_SPRG3(r3) 109 mtspr SPRN_SPRG3, r3 110#endif /* CONFIG_PPC_BOOK3S_64 */ 111 112 PPC_LL r4, VCPU_SHADOW_MSR(r4) /* get shadow_msr */ 113 114 /* Jump to segment patching handler and into our guest */ 115 bl FUNC(kvmppc_entry_trampoline) 116 nop 117 118/* 119 * This is the handler in module memory. It gets jumped at from the 120 * lowmem trampoline code, so it's basically the guest exit code. 121 * 122 */ 123 124 /* 125 * Register usage at this point: 126 * 127 * R1 = host R1 128 * R2 = host R2 129 * R12 = exit handler id 130 * R13 = PACA 131 * SVCPU.* = guest * 132 * MSR.EE = 1 133 * 134 */ 135 136 PPC_LL r3, GPR4(r1) /* vcpu pointer */ 137 138 /* 139 * kvmppc_copy_from_svcpu can clobber volatile registers, save 140 * the exit handler id to the vcpu and restore it from there later. 141 */ 142 stw r12, VCPU_TRAP(r3) 143 144 /* Transfer reg values from shadow vcpu back to vcpu struct */ 145 /* On 64-bit, interrupts are still off at this point */ 146 147 GET_SHADOW_VCPU(r4) 148 bl FUNC(kvmppc_copy_from_svcpu) 149 nop 150 151#ifdef CONFIG_PPC_BOOK3S_64 152 /* 153 * Reload kernel SPRG3 value. 154 * No need to save guest value as usermode can't modify SPRG3. 155 */ 156 ld r3, PACA_SPRG3(r13) 157 mtspr SPRN_SPRG3, r3 158#endif /* CONFIG_PPC_BOOK3S_64 */ 159 160 /* R7 = vcpu */ 161 PPC_LL r7, GPR4(r1) 162 163 PPC_STL r14, VCPU_GPR(R14)(r7) 164 PPC_STL r15, VCPU_GPR(R15)(r7) 165 PPC_STL r16, VCPU_GPR(R16)(r7) 166 PPC_STL r17, VCPU_GPR(R17)(r7) 167 PPC_STL r18, VCPU_GPR(R18)(r7) 168 PPC_STL r19, VCPU_GPR(R19)(r7) 169 PPC_STL r20, VCPU_GPR(R20)(r7) 170 PPC_STL r21, VCPU_GPR(R21)(r7) 171 PPC_STL r22, VCPU_GPR(R22)(r7) 172 PPC_STL r23, VCPU_GPR(R23)(r7) 173 PPC_STL r24, VCPU_GPR(R24)(r7) 174 PPC_STL r25, VCPU_GPR(R25)(r7) 175 PPC_STL r26, VCPU_GPR(R26)(r7) 176 PPC_STL r27, VCPU_GPR(R27)(r7) 177 PPC_STL r28, VCPU_GPR(R28)(r7) 178 PPC_STL r29, VCPU_GPR(R29)(r7) 179 PPC_STL r30, VCPU_GPR(R30)(r7) 180 PPC_STL r31, VCPU_GPR(R31)(r7) 181 182 /* Pass the exit number as 3rd argument to kvmppc_handle_exit */ 183 lwz r5, VCPU_TRAP(r7) 184 185 /* Restore r3 (kvm_run) and r4 (vcpu) */ 186 REST_2GPRS(3, r1) 187 bl FUNC(kvmppc_handle_exit_pr) 188 189 /* If RESUME_GUEST, get back in the loop */ 190 cmpwi r3, RESUME_GUEST 191 beq kvm_loop_lightweight 192 193 cmpwi r3, RESUME_GUEST_NV 194 beq kvm_loop_heavyweight 195 196kvm_exit_loop: 197 198 PPC_LL r4, _LINK(r1) 199 mtlr r4 200 201 lwz r14, _CCR(r1) 202 mtcr r14 203 204 /* Restore non-volatile host registers (r14 - r31) */ 205 REST_NVGPRS(r1) 206 207 addi r1, r1, SWITCH_FRAME_SIZE 208 blr 209 210kvm_loop_heavyweight: 211 212 PPC_LL r4, _LINK(r1) 213 PPC_STL r4, (PPC_LR_STKOFF + SWITCH_FRAME_SIZE)(r1) 214 215 /* Load vcpu and cpu_run */ 216 REST_2GPRS(3, r1) 217 218 /* Load non-volatile guest state from the vcpu */ 219 VCPU_LOAD_NVGPRS(r4) 220 221 /* Jump back into the beginning of this function */ 222 b kvm_start_lightweight 223 224kvm_loop_lightweight: 225 226 /* We'll need the vcpu pointer */ 227 REST_GPR(4, r1) 228 229 /* Jump back into the beginning of this function */ 230 b kvm_start_lightweight 231