| /* |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License, version 2, as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| * |
| * Copyright IBM Corp. 2007 |
| * |
| * Authors: Hollis Blanchard <hollisb@us.ibm.com> |
| */ |
| |
| #include <asm/ppc_asm.h> |
| #include <asm/kvm_asm.h> |
| #include <asm/reg.h> |
| #include <asm/mmu-44x.h> |
| #include <asm/page.h> |
| #include <asm/asm-offsets.h> |
| |
| #define KVMPPC_MSR_MASK (MSR_CE|MSR_EE|MSR_PR|MSR_DE|MSR_ME|MSR_IS|MSR_DS) |
| |
| #define VCPU_GPR(n) (VCPU_GPRS + (n * 4)) |
| |
| /* The host stack layout: */ |
| #define HOST_R1 0 /* Implied by stwu. */ |
| #define HOST_CALLEE_LR 4 |
| #define HOST_RUN 8 |
| /* r2 is special: it holds 'current', and it made nonvolatile in the |
| * kernel with the -ffixed-r2 gcc option. */ |
| #define HOST_R2 12 |
| #define HOST_NV_GPRS 16 |
| #define HOST_NV_GPR(n) (HOST_NV_GPRS + ((n - 14) * 4)) |
| #define HOST_MIN_STACK_SIZE (HOST_NV_GPR(31) + 4) |
| #define HOST_STACK_SIZE (((HOST_MIN_STACK_SIZE + 15) / 16) * 16) /* Align. */ |
| #define HOST_STACK_LR (HOST_STACK_SIZE + 4) /* In caller stack frame. */ |
| |
| #define NEED_INST_MASK ((1<<BOOKE_INTERRUPT_PROGRAM) | \ |
| (1<<BOOKE_INTERRUPT_DTLB_MISS) | \ |
| (1<<BOOKE_INTERRUPT_DEBUG)) |
| |
| #define NEED_DEAR_MASK ((1<<BOOKE_INTERRUPT_DATA_STORAGE) | \ |
| (1<<BOOKE_INTERRUPT_DTLB_MISS)) |
| |
| #define NEED_ESR_MASK ((1<<BOOKE_INTERRUPT_DATA_STORAGE) | \ |
| (1<<BOOKE_INTERRUPT_INST_STORAGE) | \ |
| (1<<BOOKE_INTERRUPT_PROGRAM) | \ |
| (1<<BOOKE_INTERRUPT_DTLB_MISS)) |
| |
| .macro KVM_HANDLER ivor_nr |
| _GLOBAL(kvmppc_handler_\ivor_nr) |
| /* Get pointer to vcpu and record exit number. */ |
| mtspr SPRN_SPRG0, r4 |
| mfspr r4, SPRN_SPRG1 |
| stw r5, VCPU_GPR(r5)(r4) |
| stw r6, VCPU_GPR(r6)(r4) |
| mfctr r5 |
| lis r6, kvmppc_resume_host@h |
| stw r5, VCPU_CTR(r4) |
| li r5, \ivor_nr |
| ori r6, r6, kvmppc_resume_host@l |
| mtctr r6 |
| bctr |
| .endm |
| |
| _GLOBAL(kvmppc_handlers_start) |
| KVM_HANDLER BOOKE_INTERRUPT_CRITICAL |
| KVM_HANDLER BOOKE_INTERRUPT_MACHINE_CHECK |
| KVM_HANDLER BOOKE_INTERRUPT_DATA_STORAGE |
| KVM_HANDLER BOOKE_INTERRUPT_INST_STORAGE |
| KVM_HANDLER BOOKE_INTERRUPT_EXTERNAL |
| KVM_HANDLER BOOKE_INTERRUPT_ALIGNMENT |
| KVM_HANDLER BOOKE_INTERRUPT_PROGRAM |
| KVM_HANDLER BOOKE_INTERRUPT_FP_UNAVAIL |
| KVM_HANDLER BOOKE_INTERRUPT_SYSCALL |
| KVM_HANDLER BOOKE_INTERRUPT_AP_UNAVAIL |
| KVM_HANDLER BOOKE_INTERRUPT_DECREMENTER |
| KVM_HANDLER BOOKE_INTERRUPT_FIT |
| KVM_HANDLER BOOKE_INTERRUPT_WATCHDOG |
| KVM_HANDLER BOOKE_INTERRUPT_DTLB_MISS |
| KVM_HANDLER BOOKE_INTERRUPT_ITLB_MISS |
| KVM_HANDLER BOOKE_INTERRUPT_DEBUG |
| |
| _GLOBAL(kvmppc_handler_len) |
| .long kvmppc_handler_1 - kvmppc_handler_0 |
| |
| |
| /* Registers: |
| * SPRG0: guest r4 |
| * r4: vcpu pointer |
| * r5: KVM exit number |
| */ |
| _GLOBAL(kvmppc_resume_host) |
| stw r3, VCPU_GPR(r3)(r4) |
| mfcr r3 |
| stw r3, VCPU_CR(r4) |
| stw r7, VCPU_GPR(r7)(r4) |
| stw r8, VCPU_GPR(r8)(r4) |
| stw r9, VCPU_GPR(r9)(r4) |
| |
| li r6, 1 |
| slw r6, r6, r5 |
| |
| #ifdef CONFIG_KVM_EXIT_TIMING |
| /* save exit time */ |
| 1: |
| mfspr r7, SPRN_TBRU |
| mfspr r8, SPRN_TBRL |
| mfspr r9, SPRN_TBRU |
| cmpw r9, r7 |
| bne 1b |
| stw r8, VCPU_TIMING_EXIT_TBL(r4) |
| stw r9, VCPU_TIMING_EXIT_TBU(r4) |
| #endif |
| |
| /* Save the faulting instruction and all GPRs for emulation. */ |
| andi. r7, r6, NEED_INST_MASK |
| beq ..skip_inst_copy |
| mfspr r9, SPRN_SRR0 |
| mfmsr r8 |
| ori r7, r8, MSR_DS |
| mtmsr r7 |
| isync |
| lwz r9, 0(r9) |
| mtmsr r8 |
| isync |
| stw r9, VCPU_LAST_INST(r4) |
| |
| stw r15, VCPU_GPR(r15)(r4) |
| stw r16, VCPU_GPR(r16)(r4) |
| stw r17, VCPU_GPR(r17)(r4) |
| stw r18, VCPU_GPR(r18)(r4) |
| stw r19, VCPU_GPR(r19)(r4) |
| stw r20, VCPU_GPR(r20)(r4) |
| stw r21, VCPU_GPR(r21)(r4) |
| stw r22, VCPU_GPR(r22)(r4) |
| stw r23, VCPU_GPR(r23)(r4) |
| stw r24, VCPU_GPR(r24)(r4) |
| stw r25, VCPU_GPR(r25)(r4) |
| stw r26, VCPU_GPR(r26)(r4) |
| stw r27, VCPU_GPR(r27)(r4) |
| stw r28, VCPU_GPR(r28)(r4) |
| stw r29, VCPU_GPR(r29)(r4) |
| stw r30, VCPU_GPR(r30)(r4) |
| stw r31, VCPU_GPR(r31)(r4) |
| ..skip_inst_copy: |
| |
| /* Also grab DEAR and ESR before the host can clobber them. */ |
| |
| andi. r7, r6, NEED_DEAR_MASK |
| beq ..skip_dear |
| mfspr r9, SPRN_DEAR |
| stw r9, VCPU_FAULT_DEAR(r4) |
| ..skip_dear: |
| |
| andi. r7, r6, NEED_ESR_MASK |
| beq ..skip_esr |
| mfspr r9, SPRN_ESR |
| stw r9, VCPU_FAULT_ESR(r4) |
| ..skip_esr: |
| |
| /* Save remaining volatile guest register state to vcpu. */ |
| stw r0, VCPU_GPR(r0)(r4) |
| stw r1, VCPU_GPR(r1)(r4) |
| stw r2, VCPU_GPR(r2)(r4) |
| stw r10, VCPU_GPR(r10)(r4) |
| stw r11, VCPU_GPR(r11)(r4) |
| stw r12, VCPU_GPR(r12)(r4) |
| stw r13, VCPU_GPR(r13)(r4) |
| stw r14, VCPU_GPR(r14)(r4) /* We need a NV GPR below. */ |
| mflr r3 |
| stw r3, VCPU_LR(r4) |
| mfxer r3 |
| stw r3, VCPU_XER(r4) |
| mfspr r3, SPRN_SPRG0 |
| stw r3, VCPU_GPR(r4)(r4) |
| mfspr r3, SPRN_SRR0 |
| stw r3, VCPU_PC(r4) |
| |
| /* Restore host stack pointer and PID before IVPR, since the host |
| * exception handlers use them. */ |
| lwz r1, VCPU_HOST_STACK(r4) |
| lwz r3, VCPU_HOST_PID(r4) |
| mtspr SPRN_PID, r3 |
| |
| /* Restore host IVPR before re-enabling interrupts. We cheat and know |
| * that Linux IVPR is always 0xc0000000. */ |
| lis r3, 0xc000 |
| mtspr SPRN_IVPR, r3 |
| |
| /* Switch to kernel stack and jump to handler. */ |
| LOAD_REG_ADDR(r3, kvmppc_handle_exit) |
| mtctr r3 |
| lwz r3, HOST_RUN(r1) |
| lwz r2, HOST_R2(r1) |
| mr r14, r4 /* Save vcpu pointer. */ |
| |
| bctrl /* kvmppc_handle_exit() */ |
| |
| /* Restore vcpu pointer and the nonvolatiles we used. */ |
| mr r4, r14 |
| lwz r14, VCPU_GPR(r14)(r4) |
| |
| /* Sometimes instruction emulation must restore complete GPR state. */ |
| andi. r5, r3, RESUME_FLAG_NV |
| beq ..skip_nv_load |
| lwz r15, VCPU_GPR(r15)(r4) |
| lwz r16, VCPU_GPR(r16)(r4) |
| lwz r17, VCPU_GPR(r17)(r4) |
| lwz r18, VCPU_GPR(r18)(r4) |
| lwz r19, VCPU_GPR(r19)(r4) |
| lwz r20, VCPU_GPR(r20)(r4) |
| lwz r21, VCPU_GPR(r21)(r4) |
| lwz r22, VCPU_GPR(r22)(r4) |
| lwz r23, VCPU_GPR(r23)(r4) |
| lwz r24, VCPU_GPR(r24)(r4) |
| lwz r25, VCPU_GPR(r25)(r4) |
| lwz r26, VCPU_GPR(r26)(r4) |
| lwz r27, VCPU_GPR(r27)(r4) |
| lwz r28, VCPU_GPR(r28)(r4) |
| lwz r29, VCPU_GPR(r29)(r4) |
| lwz r30, VCPU_GPR(r30)(r4) |
| lwz r31, VCPU_GPR(r31)(r4) |
| ..skip_nv_load: |
| |
| /* Should we return to the guest? */ |
| andi. r5, r3, RESUME_FLAG_HOST |
| beq lightweight_exit |
| |
| srawi r3, r3, 2 /* Shift -ERR back down. */ |
| |
| heavyweight_exit: |
| /* Not returning to guest. */ |
| |
| /* We already saved guest volatile register state; now save the |
| * non-volatiles. */ |
| stw r15, VCPU_GPR(r15)(r4) |
| stw r16, VCPU_GPR(r16)(r4) |
| stw r17, VCPU_GPR(r17)(r4) |
| stw r18, VCPU_GPR(r18)(r4) |
| stw r19, VCPU_GPR(r19)(r4) |
| stw r20, VCPU_GPR(r20)(r4) |
| stw r21, VCPU_GPR(r21)(r4) |
| stw r22, VCPU_GPR(r22)(r4) |
| stw r23, VCPU_GPR(r23)(r4) |
| stw r24, VCPU_GPR(r24)(r4) |
| stw r25, VCPU_GPR(r25)(r4) |
| stw r26, VCPU_GPR(r26)(r4) |
| stw r27, VCPU_GPR(r27)(r4) |
| stw r28, VCPU_GPR(r28)(r4) |
| stw r29, VCPU_GPR(r29)(r4) |
| stw r30, VCPU_GPR(r30)(r4) |
| stw r31, VCPU_GPR(r31)(r4) |
| |
| /* Load host non-volatile register state from host stack. */ |
| lwz r14, HOST_NV_GPR(r14)(r1) |
| lwz r15, HOST_NV_GPR(r15)(r1) |
| lwz r16, HOST_NV_GPR(r16)(r1) |
| lwz r17, HOST_NV_GPR(r17)(r1) |
| lwz r18, HOST_NV_GPR(r18)(r1) |
| lwz r19, HOST_NV_GPR(r19)(r1) |
| lwz r20, HOST_NV_GPR(r20)(r1) |
| lwz r21, HOST_NV_GPR(r21)(r1) |
| lwz r22, HOST_NV_GPR(r22)(r1) |
| lwz r23, HOST_NV_GPR(r23)(r1) |
| lwz r24, HOST_NV_GPR(r24)(r1) |
| lwz r25, HOST_NV_GPR(r25)(r1) |
| lwz r26, HOST_NV_GPR(r26)(r1) |
| lwz r27, HOST_NV_GPR(r27)(r1) |
| lwz r28, HOST_NV_GPR(r28)(r1) |
| lwz r29, HOST_NV_GPR(r29)(r1) |
| lwz r30, HOST_NV_GPR(r30)(r1) |
| lwz r31, HOST_NV_GPR(r31)(r1) |
| |
| /* Return to kvm_vcpu_run(). */ |
| lwz r4, HOST_STACK_LR(r1) |
| addi r1, r1, HOST_STACK_SIZE |
| mtlr r4 |
| /* r3 still contains the return code from kvmppc_handle_exit(). */ |
| blr |
| |
| |
| /* Registers: |
| * r3: kvm_run pointer |
| * r4: vcpu pointer |
| */ |
| _GLOBAL(__kvmppc_vcpu_run) |
| stwu r1, -HOST_STACK_SIZE(r1) |
| stw r1, VCPU_HOST_STACK(r4) /* Save stack pointer to vcpu. */ |
| |
| /* Save host state to stack. */ |
| stw r3, HOST_RUN(r1) |
| mflr r3 |
| stw r3, HOST_STACK_LR(r1) |
| |
| /* Save host non-volatile register state to stack. */ |
| stw r14, HOST_NV_GPR(r14)(r1) |
| stw r15, HOST_NV_GPR(r15)(r1) |
| stw r16, HOST_NV_GPR(r16)(r1) |
| stw r17, HOST_NV_GPR(r17)(r1) |
| stw r18, HOST_NV_GPR(r18)(r1) |
| stw r19, HOST_NV_GPR(r19)(r1) |
| stw r20, HOST_NV_GPR(r20)(r1) |
| stw r21, HOST_NV_GPR(r21)(r1) |
| stw r22, HOST_NV_GPR(r22)(r1) |
| stw r23, HOST_NV_GPR(r23)(r1) |
| stw r24, HOST_NV_GPR(r24)(r1) |
| stw r25, HOST_NV_GPR(r25)(r1) |
| stw r26, HOST_NV_GPR(r26)(r1) |
| stw r27, HOST_NV_GPR(r27)(r1) |
| stw r28, HOST_NV_GPR(r28)(r1) |
| stw r29, HOST_NV_GPR(r29)(r1) |
| stw r30, HOST_NV_GPR(r30)(r1) |
| stw r31, HOST_NV_GPR(r31)(r1) |
| |
| /* Load guest non-volatiles. */ |
| lwz r14, VCPU_GPR(r14)(r4) |
| lwz r15, VCPU_GPR(r15)(r4) |
| lwz r16, VCPU_GPR(r16)(r4) |
| lwz r17, VCPU_GPR(r17)(r4) |
| lwz r18, VCPU_GPR(r18)(r4) |
| lwz r19, VCPU_GPR(r19)(r4) |
| lwz r20, VCPU_GPR(r20)(r4) |
| lwz r21, VCPU_GPR(r21)(r4) |
| lwz r22, VCPU_GPR(r22)(r4) |
| lwz r23, VCPU_GPR(r23)(r4) |
| lwz r24, VCPU_GPR(r24)(r4) |
| lwz r25, VCPU_GPR(r25)(r4) |
| lwz r26, VCPU_GPR(r26)(r4) |
| lwz r27, VCPU_GPR(r27)(r4) |
| lwz r28, VCPU_GPR(r28)(r4) |
| lwz r29, VCPU_GPR(r29)(r4) |
| lwz r30, VCPU_GPR(r30)(r4) |
| lwz r31, VCPU_GPR(r31)(r4) |
| |
| lightweight_exit: |
| stw r2, HOST_R2(r1) |
| |
| mfspr r3, SPRN_PID |
| stw r3, VCPU_HOST_PID(r4) |
| lwz r3, VCPU_SHADOW_PID(r4) |
| mtspr SPRN_PID, r3 |
| |
| iccci 0, 0 /* XXX hack */ |
| |
| /* Load some guest volatiles. */ |
| lwz r0, VCPU_GPR(r0)(r4) |
| lwz r2, VCPU_GPR(r2)(r4) |
| lwz r9, VCPU_GPR(r9)(r4) |
| lwz r10, VCPU_GPR(r10)(r4) |
| lwz r11, VCPU_GPR(r11)(r4) |
| lwz r12, VCPU_GPR(r12)(r4) |
| lwz r13, VCPU_GPR(r13)(r4) |
| lwz r3, VCPU_LR(r4) |
| mtlr r3 |
| lwz r3, VCPU_XER(r4) |
| mtxer r3 |
| |
| /* Switch the IVPR. XXX If we take a TLB miss after this we're screwed, |
| * so how do we make sure vcpu won't fault? */ |
| lis r8, kvmppc_booke_handlers@ha |
| lwz r8, kvmppc_booke_handlers@l(r8) |
| mtspr SPRN_IVPR, r8 |
| |
| /* Save vcpu pointer for the exception handlers. */ |
| mtspr SPRN_SPRG1, r4 |
| |
| /* Can't switch the stack pointer until after IVPR is switched, |
| * because host interrupt handlers would get confused. */ |
| lwz r1, VCPU_GPR(r1)(r4) |
| |
| /* XXX handle USPRG0 */ |
| /* Host interrupt handlers may have clobbered these guest-readable |
| * SPRGs, so we need to reload them here with the guest's values. */ |
| lwz r3, VCPU_SPRG4(r4) |
| mtspr SPRN_SPRG4, r3 |
| lwz r3, VCPU_SPRG5(r4) |
| mtspr SPRN_SPRG5, r3 |
| lwz r3, VCPU_SPRG6(r4) |
| mtspr SPRN_SPRG6, r3 |
| lwz r3, VCPU_SPRG7(r4) |
| mtspr SPRN_SPRG7, r3 |
| |
| #ifdef CONFIG_KVM_EXIT_TIMING |
| /* save enter time */ |
| 1: |
| mfspr r6, SPRN_TBRU |
| mfspr r7, SPRN_TBRL |
| mfspr r8, SPRN_TBRU |
| cmpw r8, r6 |
| bne 1b |
| stw r7, VCPU_TIMING_LAST_ENTER_TBL(r4) |
| stw r8, VCPU_TIMING_LAST_ENTER_TBU(r4) |
| #endif |
| |
| /* Finish loading guest volatiles and jump to guest. */ |
| lwz r3, VCPU_CTR(r4) |
| mtctr r3 |
| lwz r3, VCPU_CR(r4) |
| mtcr r3 |
| lwz r5, VCPU_GPR(r5)(r4) |
| lwz r6, VCPU_GPR(r6)(r4) |
| lwz r7, VCPU_GPR(r7)(r4) |
| lwz r8, VCPU_GPR(r8)(r4) |
| lwz r3, VCPU_PC(r4) |
| mtsrr0 r3 |
| lwz r3, VCPU_MSR(r4) |
| oris r3, r3, KVMPPC_MSR_MASK@h |
| ori r3, r3, KVMPPC_MSR_MASK@l |
| mtsrr1 r3 |
| |
| /* Clear any debug events which occurred since we disabled MSR[DE]. |
| * XXX This gives us a 3-instruction window in which a breakpoint |
| * intended for guest context could fire in the host instead. */ |
| lis r3, 0xffff |
| ori r3, r3, 0xffff |
| mtspr SPRN_DBSR, r3 |
| |
| lwz r3, VCPU_GPR(r3)(r4) |
| lwz r4, VCPU_GPR(r4)(r4) |
| rfi |