/* * 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_SPRG_WSCRATCH0, r4 mfspr r4, SPRN_SPRG_RVCPU 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 KVM_HANDLER BOOKE_INTERRUPT_SPE_UNAVAIL KVM_HANDLER BOOKE_INTERRUPT_SPE_FP_DATA KVM_HANDLER BOOKE_INTERRUPT_SPE_FP_ROUND _GLOBAL(kvmppc_handler_len) .long kvmppc_handler_1 - kvmppc_handler_0 /* Registers: * SPRG_SCRATCH0: 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_SPRG_RSCRATCH0 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 #ifdef CONFIG_44x iccci 0, 0 /* XXX hack */ #endif /* 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_SPRG_WVCPU, 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_SPRG4W, r3 lwz r3, VCPU_SPRG5(r4) mtspr SPRN_SPRG5W, r3 lwz r3, VCPU_SPRG6(r4) mtspr SPRN_SPRG6W, r3 lwz r3, VCPU_SPRG7(r4) mtspr SPRN_SPRG7W, 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