| /* |
| * 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. |
| * |
| * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> |
| * |
| * Derived from book3s_rmhandlers.S and other files, which are: |
| * |
| * Copyright SUSE Linux Products GmbH 2009 |
| * |
| * Authors: Alexander Graf <agraf@suse.de> |
| */ |
| |
| #include <asm/ppc_asm.h> |
| #include <asm/kvm_asm.h> |
| #include <asm/reg.h> |
| #include <asm/mmu.h> |
| #include <asm/page.h> |
| #include <asm/ptrace.h> |
| #include <asm/hvcall.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/exception-64s.h> |
| #include <asm/kvm_book3s_asm.h> |
| #include <asm/mmu-hash64.h> |
| |
| /***************************************************************************** |
| * * |
| * Real Mode handlers that need to be in the linear mapping * |
| * * |
| ****************************************************************************/ |
| |
| .globl kvmppc_skip_interrupt |
| kvmppc_skip_interrupt: |
| mfspr r13,SPRN_SRR0 |
| addi r13,r13,4 |
| mtspr SPRN_SRR0,r13 |
| GET_SCRATCH0(r13) |
| rfid |
| b . |
| |
| .globl kvmppc_skip_Hinterrupt |
| kvmppc_skip_Hinterrupt: |
| mfspr r13,SPRN_HSRR0 |
| addi r13,r13,4 |
| mtspr SPRN_HSRR0,r13 |
| GET_SCRATCH0(r13) |
| hrfid |
| b . |
| |
| /* |
| * Call kvmppc_hv_entry in real mode. |
| * Must be called with interrupts hard-disabled. |
| * |
| * Input Registers: |
| * |
| * LR = return address to continue at after eventually re-enabling MMU |
| */ |
| _GLOBAL(kvmppc_hv_entry_trampoline) |
| mfmsr r10 |
| LOAD_REG_ADDR(r5, kvmppc_hv_entry) |
| li r0,MSR_RI |
| andc r0,r10,r0 |
| li r6,MSR_IR | MSR_DR |
| andc r6,r10,r6 |
| mtmsrd r0,1 /* clear RI in MSR */ |
| mtsrr0 r5 |
| mtsrr1 r6 |
| RFI |
| |
| /****************************************************************************** |
| * * |
| * Entry code * |
| * * |
| *****************************************************************************/ |
| |
| #define XICS_XIRR 4 |
| #define XICS_QIRR 0xc |
| #define XICS_IPI 2 /* interrupt source # for IPIs */ |
| |
| /* |
| * We come in here when wakened from nap mode on a secondary hw thread. |
| * Relocation is off and most register values are lost. |
| * r13 points to the PACA. |
| */ |
| .globl kvm_start_guest |
| kvm_start_guest: |
| ld r1,PACAEMERGSP(r13) |
| subi r1,r1,STACK_FRAME_OVERHEAD |
| ld r2,PACATOC(r13) |
| |
| li r0,KVM_HWTHREAD_IN_KVM |
| stb r0,HSTATE_HWTHREAD_STATE(r13) |
| |
| /* NV GPR values from power7_idle() will no longer be valid */ |
| li r0,1 |
| stb r0,PACA_NAPSTATELOST(r13) |
| |
| /* get vcpu pointer, NULL if we have no vcpu to run */ |
| ld r4,HSTATE_KVM_VCPU(r13) |
| cmpdi cr1,r4,0 |
| |
| /* Check the wake reason in SRR1 to see why we got here */ |
| mfspr r3,SPRN_SRR1 |
| rlwinm r3,r3,44-31,0x7 /* extract wake reason field */ |
| cmpwi r3,4 /* was it an external interrupt? */ |
| bne 27f |
| |
| /* |
| * External interrupt - for now assume it is an IPI, since we |
| * should never get any other interrupts sent to offline threads. |
| * Only do this for secondary threads. |
| */ |
| beq cr1,25f |
| lwz r3,VCPU_PTID(r4) |
| cmpwi r3,0 |
| beq 27f |
| 25: ld r5,HSTATE_XICS_PHYS(r13) |
| li r0,0xff |
| li r6,XICS_QIRR |
| li r7,XICS_XIRR |
| lwzcix r8,r5,r7 /* get and ack the interrupt */ |
| sync |
| clrldi. r9,r8,40 /* get interrupt source ID. */ |
| beq 27f /* none there? */ |
| cmpwi r9,XICS_IPI |
| bne 26f |
| stbcix r0,r5,r6 /* clear IPI */ |
| 26: stwcix r8,r5,r7 /* EOI the interrupt */ |
| |
| 27: /* XXX should handle hypervisor maintenance interrupts etc. here */ |
| |
| /* reload vcpu pointer after clearing the IPI */ |
| ld r4,HSTATE_KVM_VCPU(r13) |
| cmpdi r4,0 |
| /* if we have no vcpu to run, go back to sleep */ |
| beq kvm_no_guest |
| |
| /* were we napping due to cede? */ |
| lbz r0,HSTATE_NAPPING(r13) |
| cmpwi r0,0 |
| bne kvm_end_cede |
| |
| .global kvmppc_hv_entry |
| kvmppc_hv_entry: |
| |
| /* Required state: |
| * |
| * R4 = vcpu pointer |
| * MSR = ~IR|DR |
| * R13 = PACA |
| * R1 = host R1 |
| * all other volatile GPRS = free |
| */ |
| mflr r0 |
| std r0, HSTATE_VMHANDLER(r13) |
| |
| /* Set partition DABR */ |
| /* Do this before re-enabling PMU to avoid P7 DABR corruption bug */ |
| li r5,3 |
| ld r6,VCPU_DABR(r4) |
| mtspr SPRN_DABRX,r5 |
| mtspr SPRN_DABR,r6 |
| BEGIN_FTR_SECTION |
| isync |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) |
| |
| /* Load guest PMU registers */ |
| /* R4 is live here (vcpu pointer) */ |
| li r3, 1 |
| sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */ |
| mtspr SPRN_MMCR0, r3 /* freeze all counters, disable ints */ |
| isync |
| lwz r3, VCPU_PMC(r4) /* always load up guest PMU registers */ |
| lwz r5, VCPU_PMC + 4(r4) /* to prevent information leak */ |
| lwz r6, VCPU_PMC + 8(r4) |
| lwz r7, VCPU_PMC + 12(r4) |
| lwz r8, VCPU_PMC + 16(r4) |
| lwz r9, VCPU_PMC + 20(r4) |
| BEGIN_FTR_SECTION |
| lwz r10, VCPU_PMC + 24(r4) |
| lwz r11, VCPU_PMC + 28(r4) |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) |
| mtspr SPRN_PMC1, r3 |
| mtspr SPRN_PMC2, r5 |
| mtspr SPRN_PMC3, r6 |
| mtspr SPRN_PMC4, r7 |
| mtspr SPRN_PMC5, r8 |
| mtspr SPRN_PMC6, r9 |
| BEGIN_FTR_SECTION |
| mtspr SPRN_PMC7, r10 |
| mtspr SPRN_PMC8, r11 |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) |
| ld r3, VCPU_MMCR(r4) |
| ld r5, VCPU_MMCR + 8(r4) |
| ld r6, VCPU_MMCR + 16(r4) |
| mtspr SPRN_MMCR1, r5 |
| mtspr SPRN_MMCRA, r6 |
| mtspr SPRN_MMCR0, r3 |
| isync |
| |
| /* Load up FP, VMX and VSX registers */ |
| bl kvmppc_load_fp |
| |
| ld r14, VCPU_GPR(R14)(r4) |
| ld r15, VCPU_GPR(R15)(r4) |
| ld r16, VCPU_GPR(R16)(r4) |
| ld r17, VCPU_GPR(R17)(r4) |
| ld r18, VCPU_GPR(R18)(r4) |
| ld r19, VCPU_GPR(R19)(r4) |
| ld r20, VCPU_GPR(R20)(r4) |
| ld r21, VCPU_GPR(R21)(r4) |
| ld r22, VCPU_GPR(R22)(r4) |
| ld r23, VCPU_GPR(R23)(r4) |
| ld r24, VCPU_GPR(R24)(r4) |
| ld r25, VCPU_GPR(R25)(r4) |
| ld r26, VCPU_GPR(R26)(r4) |
| ld r27, VCPU_GPR(R27)(r4) |
| ld r28, VCPU_GPR(R28)(r4) |
| ld r29, VCPU_GPR(R29)(r4) |
| ld r30, VCPU_GPR(R30)(r4) |
| ld r31, VCPU_GPR(R31)(r4) |
| |
| BEGIN_FTR_SECTION |
| /* Switch DSCR to guest value */ |
| ld r5, VCPU_DSCR(r4) |
| mtspr SPRN_DSCR, r5 |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) |
| |
| /* |
| * Set the decrementer to the guest decrementer. |
| */ |
| ld r8,VCPU_DEC_EXPIRES(r4) |
| mftb r7 |
| subf r3,r7,r8 |
| mtspr SPRN_DEC,r3 |
| stw r3,VCPU_DEC(r4) |
| |
| ld r5, VCPU_SPRG0(r4) |
| ld r6, VCPU_SPRG1(r4) |
| ld r7, VCPU_SPRG2(r4) |
| ld r8, VCPU_SPRG3(r4) |
| mtspr SPRN_SPRG0, r5 |
| mtspr SPRN_SPRG1, r6 |
| mtspr SPRN_SPRG2, r7 |
| mtspr SPRN_SPRG3, r8 |
| |
| /* Save R1 in the PACA */ |
| std r1, HSTATE_HOST_R1(r13) |
| |
| /* Increment yield count if they have a VPA */ |
| ld r3, VCPU_VPA(r4) |
| cmpdi r3, 0 |
| beq 25f |
| lwz r5, LPPACA_YIELDCOUNT(r3) |
| addi r5, r5, 1 |
| stw r5, LPPACA_YIELDCOUNT(r3) |
| 25: |
| /* Load up DAR and DSISR */ |
| ld r5, VCPU_DAR(r4) |
| lwz r6, VCPU_DSISR(r4) |
| mtspr SPRN_DAR, r5 |
| mtspr SPRN_DSISR, r6 |
| |
| BEGIN_FTR_SECTION |
| /* Restore AMR and UAMOR, set AMOR to all 1s */ |
| ld r5,VCPU_AMR(r4) |
| ld r6,VCPU_UAMOR(r4) |
| li r7,-1 |
| mtspr SPRN_AMR,r5 |
| mtspr SPRN_UAMOR,r6 |
| mtspr SPRN_AMOR,r7 |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) |
| |
| /* Clear out SLB */ |
| li r6,0 |
| slbmte r6,r6 |
| slbia |
| ptesync |
| |
| BEGIN_FTR_SECTION |
| b 30f |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) |
| /* |
| * POWER7 host -> guest partition switch code. |
| * We don't have to lock against concurrent tlbies, |
| * but we do have to coordinate across hardware threads. |
| */ |
| /* Increment entry count iff exit count is zero. */ |
| ld r5,HSTATE_KVM_VCORE(r13) |
| addi r9,r5,VCORE_ENTRY_EXIT |
| 21: lwarx r3,0,r9 |
| cmpwi r3,0x100 /* any threads starting to exit? */ |
| bge secondary_too_late /* if so we're too late to the party */ |
| addi r3,r3,1 |
| stwcx. r3,0,r9 |
| bne 21b |
| |
| /* Primary thread switches to guest partition. */ |
| ld r9,VCPU_KVM(r4) /* pointer to struct kvm */ |
| lwz r6,VCPU_PTID(r4) |
| cmpwi r6,0 |
| bne 20f |
| ld r6,KVM_SDR1(r9) |
| lwz r7,KVM_LPID(r9) |
| li r0,LPID_RSVD /* switch to reserved LPID */ |
| mtspr SPRN_LPID,r0 |
| ptesync |
| mtspr SPRN_SDR1,r6 /* switch to partition page table */ |
| mtspr SPRN_LPID,r7 |
| isync |
| |
| /* See if we need to flush the TLB */ |
| lhz r6,PACAPACAINDEX(r13) /* test_bit(cpu, need_tlb_flush) */ |
| clrldi r7,r6,64-6 /* extract bit number (6 bits) */ |
| srdi r6,r6,6 /* doubleword number */ |
| sldi r6,r6,3 /* address offset */ |
| add r6,r6,r9 |
| addi r6,r6,KVM_NEED_FLUSH /* dword in kvm->arch.need_tlb_flush */ |
| li r0,1 |
| sld r0,r0,r7 |
| ld r7,0(r6) |
| and. r7,r7,r0 |
| beq 22f |
| 23: ldarx r7,0,r6 /* if set, clear the bit */ |
| andc r7,r7,r0 |
| stdcx. r7,0,r6 |
| bne 23b |
| li r6,128 /* and flush the TLB */ |
| mtctr r6 |
| li r7,0x800 /* IS field = 0b10 */ |
| ptesync |
| 28: tlbiel r7 |
| addi r7,r7,0x1000 |
| bdnz 28b |
| ptesync |
| |
| 22: li r0,1 |
| stb r0,VCORE_IN_GUEST(r5) /* signal secondaries to continue */ |
| b 10f |
| |
| /* Secondary threads wait for primary to have done partition switch */ |
| 20: lbz r0,VCORE_IN_GUEST(r5) |
| cmpwi r0,0 |
| beq 20b |
| |
| /* Set LPCR and RMOR. */ |
| 10: ld r8,KVM_LPCR(r9) |
| mtspr SPRN_LPCR,r8 |
| ld r8,KVM_RMOR(r9) |
| mtspr SPRN_RMOR,r8 |
| isync |
| |
| /* Check if HDEC expires soon */ |
| mfspr r3,SPRN_HDEC |
| cmpwi r3,10 |
| li r12,BOOK3S_INTERRUPT_HV_DECREMENTER |
| mr r9,r4 |
| blt hdec_soon |
| |
| /* Save purr/spurr */ |
| mfspr r5,SPRN_PURR |
| mfspr r6,SPRN_SPURR |
| std r5,HSTATE_PURR(r13) |
| std r6,HSTATE_SPURR(r13) |
| ld r7,VCPU_PURR(r4) |
| ld r8,VCPU_SPURR(r4) |
| mtspr SPRN_PURR,r7 |
| mtspr SPRN_SPURR,r8 |
| b 31f |
| |
| /* |
| * PPC970 host -> guest partition switch code. |
| * We have to lock against concurrent tlbies, |
| * using native_tlbie_lock to lock against host tlbies |
| * and kvm->arch.tlbie_lock to lock against guest tlbies. |
| * We also have to invalidate the TLB since its |
| * entries aren't tagged with the LPID. |
| */ |
| 30: ld r9,VCPU_KVM(r4) /* pointer to struct kvm */ |
| |
| /* first take native_tlbie_lock */ |
| .section ".toc","aw" |
| toc_tlbie_lock: |
| .tc native_tlbie_lock[TC],native_tlbie_lock |
| .previous |
| ld r3,toc_tlbie_lock@toc(2) |
| lwz r8,PACA_LOCK_TOKEN(r13) |
| 24: lwarx r0,0,r3 |
| cmpwi r0,0 |
| bne 24b |
| stwcx. r8,0,r3 |
| bne 24b |
| isync |
| |
| ld r7,KVM_LPCR(r9) /* use kvm->arch.lpcr to store HID4 */ |
| li r0,0x18f |
| rotldi r0,r0,HID4_LPID5_SH /* all lpid bits in HID4 = 1 */ |
| or r0,r7,r0 |
| ptesync |
| sync |
| mtspr SPRN_HID4,r0 /* switch to reserved LPID */ |
| isync |
| li r0,0 |
| stw r0,0(r3) /* drop native_tlbie_lock */ |
| |
| /* invalidate the whole TLB */ |
| li r0,256 |
| mtctr r0 |
| li r6,0 |
| 25: tlbiel r6 |
| addi r6,r6,0x1000 |
| bdnz 25b |
| ptesync |
| |
| /* Take the guest's tlbie_lock */ |
| addi r3,r9,KVM_TLBIE_LOCK |
| 24: lwarx r0,0,r3 |
| cmpwi r0,0 |
| bne 24b |
| stwcx. r8,0,r3 |
| bne 24b |
| isync |
| ld r6,KVM_SDR1(r9) |
| mtspr SPRN_SDR1,r6 /* switch to partition page table */ |
| |
| /* Set up HID4 with the guest's LPID etc. */ |
| sync |
| mtspr SPRN_HID4,r7 |
| isync |
| |
| /* drop the guest's tlbie_lock */ |
| li r0,0 |
| stw r0,0(r3) |
| |
| /* Check if HDEC expires soon */ |
| mfspr r3,SPRN_HDEC |
| cmpwi r3,10 |
| li r12,BOOK3S_INTERRUPT_HV_DECREMENTER |
| mr r9,r4 |
| blt hdec_soon |
| |
| /* Enable HDEC interrupts */ |
| mfspr r0,SPRN_HID0 |
| li r3,1 |
| rldimi r0,r3, HID0_HDICE_SH, 64-HID0_HDICE_SH-1 |
| sync |
| mtspr SPRN_HID0,r0 |
| mfspr r0,SPRN_HID0 |
| mfspr r0,SPRN_HID0 |
| mfspr r0,SPRN_HID0 |
| mfspr r0,SPRN_HID0 |
| mfspr r0,SPRN_HID0 |
| mfspr r0,SPRN_HID0 |
| |
| /* Load up guest SLB entries */ |
| 31: lwz r5,VCPU_SLB_MAX(r4) |
| cmpwi r5,0 |
| beq 9f |
| mtctr r5 |
| addi r6,r4,VCPU_SLB |
| 1: ld r8,VCPU_SLB_E(r6) |
| ld r9,VCPU_SLB_V(r6) |
| slbmte r9,r8 |
| addi r6,r6,VCPU_SLB_SIZE |
| bdnz 1b |
| 9: |
| |
| /* Restore state of CTRL run bit; assume 1 on entry */ |
| lwz r5,VCPU_CTRL(r4) |
| andi. r5,r5,1 |
| bne 4f |
| mfspr r6,SPRN_CTRLF |
| clrrdi r6,r6,1 |
| mtspr SPRN_CTRLT,r6 |
| 4: |
| ld r6, VCPU_CTR(r4) |
| lwz r7, VCPU_XER(r4) |
| |
| mtctr r6 |
| mtxer r7 |
| |
| kvmppc_cede_reentry: /* r4 = vcpu, r13 = paca */ |
| ld r6, VCPU_SRR0(r4) |
| ld r7, VCPU_SRR1(r4) |
| ld r10, VCPU_PC(r4) |
| ld r11, VCPU_MSR(r4) /* r11 = vcpu->arch.msr & ~MSR_HV */ |
| |
| rldicl r11, r11, 63 - MSR_HV_LG, 1 |
| rotldi r11, r11, 1 + MSR_HV_LG |
| ori r11, r11, MSR_ME |
| |
| /* Check if we can deliver an external or decrementer interrupt now */ |
| ld r0,VCPU_PENDING_EXC(r4) |
| li r8,(1 << BOOK3S_IRQPRIO_EXTERNAL) |
| oris r8,r8,(1 << BOOK3S_IRQPRIO_EXTERNAL_LEVEL)@h |
| and r0,r0,r8 |
| cmpdi cr1,r0,0 |
| andi. r0,r11,MSR_EE |
| beq cr1,11f |
| BEGIN_FTR_SECTION |
| mfspr r8,SPRN_LPCR |
| ori r8,r8,LPCR_MER |
| mtspr SPRN_LPCR,r8 |
| isync |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) |
| beq 5f |
| li r0,BOOK3S_INTERRUPT_EXTERNAL |
| 12: mr r6,r10 |
| mr r10,r0 |
| mr r7,r11 |
| li r11,(MSR_ME << 1) | 1 /* synthesize MSR_SF | MSR_ME */ |
| rotldi r11,r11,63 |
| b 5f |
| 11: beq 5f |
| mfspr r0,SPRN_DEC |
| cmpwi r0,0 |
| li r0,BOOK3S_INTERRUPT_DECREMENTER |
| blt 12b |
| |
| /* Move SRR0 and SRR1 into the respective regs */ |
| 5: mtspr SPRN_SRR0, r6 |
| mtspr SPRN_SRR1, r7 |
| li r0,0 |
| stb r0,VCPU_CEDED(r4) /* cancel cede */ |
| |
| fast_guest_return: |
| mtspr SPRN_HSRR0,r10 |
| mtspr SPRN_HSRR1,r11 |
| |
| /* Activate guest mode, so faults get handled by KVM */ |
| li r9, KVM_GUEST_MODE_GUEST |
| stb r9, HSTATE_IN_GUEST(r13) |
| |
| /* Enter guest */ |
| |
| ld r5, VCPU_LR(r4) |
| lwz r6, VCPU_CR(r4) |
| mtlr r5 |
| mtcr r6 |
| |
| ld r0, VCPU_GPR(R0)(r4) |
| ld r1, VCPU_GPR(R1)(r4) |
| ld r2, VCPU_GPR(R2)(r4) |
| ld r3, VCPU_GPR(R3)(r4) |
| ld r5, VCPU_GPR(R5)(r4) |
| ld r6, VCPU_GPR(R6)(r4) |
| ld r7, VCPU_GPR(R7)(r4) |
| ld r8, VCPU_GPR(R8)(r4) |
| ld r9, VCPU_GPR(R9)(r4) |
| ld r10, VCPU_GPR(R10)(r4) |
| ld r11, VCPU_GPR(R11)(r4) |
| ld r12, VCPU_GPR(R12)(r4) |
| ld r13, VCPU_GPR(R13)(r4) |
| |
| ld r4, VCPU_GPR(R4)(r4) |
| |
| hrfid |
| b . |
| |
| /****************************************************************************** |
| * * |
| * Exit code * |
| * * |
| *****************************************************************************/ |
| |
| /* |
| * We come here from the first-level interrupt handlers. |
| */ |
| .globl kvmppc_interrupt |
| kvmppc_interrupt: |
| /* |
| * Register contents: |
| * R12 = interrupt vector |
| * R13 = PACA |
| * guest CR, R12 saved in shadow VCPU SCRATCH1/0 |
| * guest R13 saved in SPRN_SCRATCH0 |
| */ |
| /* abuse host_r2 as third scratch area; we get r2 from PACATOC(r13) */ |
| std r9, HSTATE_HOST_R2(r13) |
| ld r9, HSTATE_KVM_VCPU(r13) |
| |
| /* Save registers */ |
| |
| std r0, VCPU_GPR(R0)(r9) |
| std r1, VCPU_GPR(R1)(r9) |
| std r2, VCPU_GPR(R2)(r9) |
| std r3, VCPU_GPR(R3)(r9) |
| std r4, VCPU_GPR(R4)(r9) |
| std r5, VCPU_GPR(R5)(r9) |
| std r6, VCPU_GPR(R6)(r9) |
| std r7, VCPU_GPR(R7)(r9) |
| std r8, VCPU_GPR(R8)(r9) |
| ld r0, HSTATE_HOST_R2(r13) |
| std r0, VCPU_GPR(R9)(r9) |
| std r10, VCPU_GPR(R10)(r9) |
| std r11, VCPU_GPR(R11)(r9) |
| ld r3, HSTATE_SCRATCH0(r13) |
| lwz r4, HSTATE_SCRATCH1(r13) |
| std r3, VCPU_GPR(R12)(r9) |
| stw r4, VCPU_CR(r9) |
| |
| /* Restore R1/R2 so we can handle faults */ |
| ld r1, HSTATE_HOST_R1(r13) |
| ld r2, PACATOC(r13) |
| |
| mfspr r10, SPRN_SRR0 |
| mfspr r11, SPRN_SRR1 |
| std r10, VCPU_SRR0(r9) |
| std r11, VCPU_SRR1(r9) |
| andi. r0, r12, 2 /* need to read HSRR0/1? */ |
| beq 1f |
| mfspr r10, SPRN_HSRR0 |
| mfspr r11, SPRN_HSRR1 |
| clrrdi r12, r12, 2 |
| 1: std r10, VCPU_PC(r9) |
| std r11, VCPU_MSR(r9) |
| |
| GET_SCRATCH0(r3) |
| mflr r4 |
| std r3, VCPU_GPR(R13)(r9) |
| std r4, VCPU_LR(r9) |
| |
| /* Unset guest mode */ |
| li r0, KVM_GUEST_MODE_NONE |
| stb r0, HSTATE_IN_GUEST(r13) |
| |
| stw r12,VCPU_TRAP(r9) |
| |
| /* Save HEIR (HV emulation assist reg) in last_inst |
| if this is an HEI (HV emulation interrupt, e40) */ |
| li r3,KVM_INST_FETCH_FAILED |
| BEGIN_FTR_SECTION |
| cmpwi r12,BOOK3S_INTERRUPT_H_EMUL_ASSIST |
| bne 11f |
| mfspr r3,SPRN_HEIR |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) |
| 11: stw r3,VCPU_LAST_INST(r9) |
| |
| /* these are volatile across C function calls */ |
| mfctr r3 |
| mfxer r4 |
| std r3, VCPU_CTR(r9) |
| stw r4, VCPU_XER(r9) |
| |
| BEGIN_FTR_SECTION |
| /* If this is a page table miss then see if it's theirs or ours */ |
| cmpwi r12, BOOK3S_INTERRUPT_H_DATA_STORAGE |
| beq kvmppc_hdsi |
| cmpwi r12, BOOK3S_INTERRUPT_H_INST_STORAGE |
| beq kvmppc_hisi |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) |
| |
| /* See if this is a leftover HDEC interrupt */ |
| cmpwi r12,BOOK3S_INTERRUPT_HV_DECREMENTER |
| bne 2f |
| mfspr r3,SPRN_HDEC |
| cmpwi r3,0 |
| bge ignore_hdec |
| 2: |
| /* See if this is an hcall we can handle in real mode */ |
| cmpwi r12,BOOK3S_INTERRUPT_SYSCALL |
| beq hcall_try_real_mode |
| |
| /* Check for mediated interrupts (could be done earlier really ...) */ |
| BEGIN_FTR_SECTION |
| cmpwi r12,BOOK3S_INTERRUPT_EXTERNAL |
| bne+ 1f |
| andi. r0,r11,MSR_EE |
| beq 1f |
| mfspr r5,SPRN_LPCR |
| andi. r0,r5,LPCR_MER |
| bne bounce_ext_interrupt |
| 1: |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) |
| |
| guest_exit_cont: /* r9 = vcpu, r12 = trap, r13 = paca */ |
| /* Save DEC */ |
| mfspr r5,SPRN_DEC |
| mftb r6 |
| extsw r5,r5 |
| add r5,r5,r6 |
| std r5,VCPU_DEC_EXPIRES(r9) |
| |
| /* Save more register state */ |
| mfdar r6 |
| mfdsisr r7 |
| std r6, VCPU_DAR(r9) |
| stw r7, VCPU_DSISR(r9) |
| BEGIN_FTR_SECTION |
| /* don't overwrite fault_dar/fault_dsisr if HDSI */ |
| cmpwi r12,BOOK3S_INTERRUPT_H_DATA_STORAGE |
| beq 6f |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) |
| std r6, VCPU_FAULT_DAR(r9) |
| stw r7, VCPU_FAULT_DSISR(r9) |
| |
| /* See if it is a machine check */ |
| cmpwi r12, BOOK3S_INTERRUPT_MACHINE_CHECK |
| beq machine_check_realmode |
| mc_cont: |
| |
| /* Save guest CTRL register, set runlatch to 1 */ |
| 6: mfspr r6,SPRN_CTRLF |
| stw r6,VCPU_CTRL(r9) |
| andi. r0,r6,1 |
| bne 4f |
| ori r6,r6,1 |
| mtspr SPRN_CTRLT,r6 |
| 4: |
| /* Read the guest SLB and save it away */ |
| lwz r0,VCPU_SLB_NR(r9) /* number of entries in SLB */ |
| mtctr r0 |
| li r6,0 |
| addi r7,r9,VCPU_SLB |
| li r5,0 |
| 1: slbmfee r8,r6 |
| andis. r0,r8,SLB_ESID_V@h |
| beq 2f |
| add r8,r8,r6 /* put index in */ |
| slbmfev r3,r6 |
| std r8,VCPU_SLB_E(r7) |
| std r3,VCPU_SLB_V(r7) |
| addi r7,r7,VCPU_SLB_SIZE |
| addi r5,r5,1 |
| 2: addi r6,r6,1 |
| bdnz 1b |
| stw r5,VCPU_SLB_MAX(r9) |
| |
| /* |
| * Save the guest PURR/SPURR |
| */ |
| BEGIN_FTR_SECTION |
| mfspr r5,SPRN_PURR |
| mfspr r6,SPRN_SPURR |
| ld r7,VCPU_PURR(r9) |
| ld r8,VCPU_SPURR(r9) |
| std r5,VCPU_PURR(r9) |
| std r6,VCPU_SPURR(r9) |
| subf r5,r7,r5 |
| subf r6,r8,r6 |
| |
| /* |
| * Restore host PURR/SPURR and add guest times |
| * so that the time in the guest gets accounted. |
| */ |
| ld r3,HSTATE_PURR(r13) |
| ld r4,HSTATE_SPURR(r13) |
| add r3,r3,r5 |
| add r4,r4,r6 |
| mtspr SPRN_PURR,r3 |
| mtspr SPRN_SPURR,r4 |
| END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_201) |
| |
| /* Clear out SLB */ |
| li r5,0 |
| slbmte r5,r5 |
| slbia |
| ptesync |
| |
| hdec_soon: /* r9 = vcpu, r12 = trap, r13 = paca */ |
| BEGIN_FTR_SECTION |
| b 32f |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) |
| /* |
| * POWER7 guest -> host partition switch code. |
| * We don't have to lock against tlbies but we do |
| * have to coordinate the hardware threads. |
| */ |
| /* Increment the threads-exiting-guest count in the 0xff00 |
| bits of vcore->entry_exit_count */ |
| lwsync |
| ld r5,HSTATE_KVM_VCORE(r13) |
| addi r6,r5,VCORE_ENTRY_EXIT |
| 41: lwarx r3,0,r6 |
| addi r0,r3,0x100 |
| stwcx. r0,0,r6 |
| bne 41b |
| lwsync |
| |
| /* |
| * At this point we have an interrupt that we have to pass |
| * up to the kernel or qemu; we can't handle it in real mode. |
| * Thus we have to do a partition switch, so we have to |
| * collect the other threads, if we are the first thread |
| * to take an interrupt. To do this, we set the HDEC to 0, |
| * which causes an HDEC interrupt in all threads within 2ns |
| * because the HDEC register is shared between all 4 threads. |
| * However, we don't need to bother if this is an HDEC |
| * interrupt, since the other threads will already be on their |
| * way here in that case. |
| */ |
| cmpwi r3,0x100 /* Are we the first here? */ |
| bge 43f |
| cmpwi r3,1 /* Are any other threads in the guest? */ |
| ble 43f |
| cmpwi r12,BOOK3S_INTERRUPT_HV_DECREMENTER |
| beq 40f |
| li r0,0 |
| mtspr SPRN_HDEC,r0 |
| 40: |
| /* |
| * Send an IPI to any napping threads, since an HDEC interrupt |
| * doesn't wake CPUs up from nap. |
| */ |
| lwz r3,VCORE_NAPPING_THREADS(r5) |
| lwz r4,VCPU_PTID(r9) |
| li r0,1 |
| sld r0,r0,r4 |
| andc. r3,r3,r0 /* no sense IPI'ing ourselves */ |
| beq 43f |
| mulli r4,r4,PACA_SIZE /* get paca for thread 0 */ |
| subf r6,r4,r13 |
| 42: andi. r0,r3,1 |
| beq 44f |
| ld r8,HSTATE_XICS_PHYS(r6) /* get thread's XICS reg addr */ |
| li r0,IPI_PRIORITY |
| li r7,XICS_QIRR |
| stbcix r0,r7,r8 /* trigger the IPI */ |
| 44: srdi. r3,r3,1 |
| addi r6,r6,PACA_SIZE |
| bne 42b |
| |
| /* Secondary threads wait for primary to do partition switch */ |
| 43: ld r4,VCPU_KVM(r9) /* pointer to struct kvm */ |
| ld r5,HSTATE_KVM_VCORE(r13) |
| lwz r3,VCPU_PTID(r9) |
| cmpwi r3,0 |
| beq 15f |
| HMT_LOW |
| 13: lbz r3,VCORE_IN_GUEST(r5) |
| cmpwi r3,0 |
| bne 13b |
| HMT_MEDIUM |
| b 16f |
| |
| /* Primary thread waits for all the secondaries to exit guest */ |
| 15: lwz r3,VCORE_ENTRY_EXIT(r5) |
| srwi r0,r3,8 |
| clrldi r3,r3,56 |
| cmpw r3,r0 |
| bne 15b |
| isync |
| |
| /* Primary thread switches back to host partition */ |
| ld r6,KVM_HOST_SDR1(r4) |
| lwz r7,KVM_HOST_LPID(r4) |
| li r8,LPID_RSVD /* switch to reserved LPID */ |
| mtspr SPRN_LPID,r8 |
| ptesync |
| mtspr SPRN_SDR1,r6 /* switch to partition page table */ |
| mtspr SPRN_LPID,r7 |
| isync |
| li r0,0 |
| stb r0,VCORE_IN_GUEST(r5) |
| lis r8,0x7fff /* MAX_INT@h */ |
| mtspr SPRN_HDEC,r8 |
| |
| 16: ld r8,KVM_HOST_LPCR(r4) |
| mtspr SPRN_LPCR,r8 |
| isync |
| b 33f |
| |
| /* |
| * PPC970 guest -> host partition switch code. |
| * We have to lock against concurrent tlbies, and |
| * we have to flush the whole TLB. |
| */ |
| 32: ld r4,VCPU_KVM(r9) /* pointer to struct kvm */ |
| |
| /* Take the guest's tlbie_lock */ |
| lwz r8,PACA_LOCK_TOKEN(r13) |
| addi r3,r4,KVM_TLBIE_LOCK |
| 24: lwarx r0,0,r3 |
| cmpwi r0,0 |
| bne 24b |
| stwcx. r8,0,r3 |
| bne 24b |
| isync |
| |
| ld r7,KVM_HOST_LPCR(r4) /* use kvm->arch.host_lpcr for HID4 */ |
| li r0,0x18f |
| rotldi r0,r0,HID4_LPID5_SH /* all lpid bits in HID4 = 1 */ |
| or r0,r7,r0 |
| ptesync |
| sync |
| mtspr SPRN_HID4,r0 /* switch to reserved LPID */ |
| isync |
| li r0,0 |
| stw r0,0(r3) /* drop guest tlbie_lock */ |
| |
| /* invalidate the whole TLB */ |
| li r0,256 |
| mtctr r0 |
| li r6,0 |
| 25: tlbiel r6 |
| addi r6,r6,0x1000 |
| bdnz 25b |
| ptesync |
| |
| /* take native_tlbie_lock */ |
| ld r3,toc_tlbie_lock@toc(2) |
| 24: lwarx r0,0,r3 |
| cmpwi r0,0 |
| bne 24b |
| stwcx. r8,0,r3 |
| bne 24b |
| isync |
| |
| ld r6,KVM_HOST_SDR1(r4) |
| mtspr SPRN_SDR1,r6 /* switch to host page table */ |
| |
| /* Set up host HID4 value */ |
| sync |
| mtspr SPRN_HID4,r7 |
| isync |
| li r0,0 |
| stw r0,0(r3) /* drop native_tlbie_lock */ |
| |
| lis r8,0x7fff /* MAX_INT@h */ |
| mtspr SPRN_HDEC,r8 |
| |
| /* Disable HDEC interrupts */ |
| mfspr r0,SPRN_HID0 |
| li r3,0 |
| rldimi r0,r3, HID0_HDICE_SH, 64-HID0_HDICE_SH-1 |
| sync |
| mtspr SPRN_HID0,r0 |
| mfspr r0,SPRN_HID0 |
| mfspr r0,SPRN_HID0 |
| mfspr r0,SPRN_HID0 |
| mfspr r0,SPRN_HID0 |
| mfspr r0,SPRN_HID0 |
| mfspr r0,SPRN_HID0 |
| |
| /* load host SLB entries */ |
| 33: ld r8,PACA_SLBSHADOWPTR(r13) |
| |
| .rept SLB_NUM_BOLTED |
| ld r5,SLBSHADOW_SAVEAREA(r8) |
| ld r6,SLBSHADOW_SAVEAREA+8(r8) |
| andis. r7,r5,SLB_ESID_V@h |
| beq 1f |
| slbmte r6,r5 |
| 1: addi r8,r8,16 |
| .endr |
| |
| /* Save and reset AMR and UAMOR before turning on the MMU */ |
| BEGIN_FTR_SECTION |
| mfspr r5,SPRN_AMR |
| mfspr r6,SPRN_UAMOR |
| std r5,VCPU_AMR(r9) |
| std r6,VCPU_UAMOR(r9) |
| li r6,0 |
| mtspr SPRN_AMR,r6 |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) |
| |
| /* Switch DSCR back to host value */ |
| BEGIN_FTR_SECTION |
| mfspr r8, SPRN_DSCR |
| ld r7, HSTATE_DSCR(r13) |
| std r8, VCPU_DSCR(r7) |
| mtspr SPRN_DSCR, r7 |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) |
| |
| /* Save non-volatile GPRs */ |
| std r14, VCPU_GPR(R14)(r9) |
| std r15, VCPU_GPR(R15)(r9) |
| std r16, VCPU_GPR(R16)(r9) |
| std r17, VCPU_GPR(R17)(r9) |
| std r18, VCPU_GPR(R18)(r9) |
| std r19, VCPU_GPR(R19)(r9) |
| std r20, VCPU_GPR(R20)(r9) |
| std r21, VCPU_GPR(R21)(r9) |
| std r22, VCPU_GPR(R22)(r9) |
| std r23, VCPU_GPR(R23)(r9) |
| std r24, VCPU_GPR(R24)(r9) |
| std r25, VCPU_GPR(R25)(r9) |
| std r26, VCPU_GPR(R26)(r9) |
| std r27, VCPU_GPR(R27)(r9) |
| std r28, VCPU_GPR(R28)(r9) |
| std r29, VCPU_GPR(R29)(r9) |
| std r30, VCPU_GPR(R30)(r9) |
| std r31, VCPU_GPR(R31)(r9) |
| |
| /* Save SPRGs */ |
| mfspr r3, SPRN_SPRG0 |
| mfspr r4, SPRN_SPRG1 |
| mfspr r5, SPRN_SPRG2 |
| mfspr r6, SPRN_SPRG3 |
| std r3, VCPU_SPRG0(r9) |
| std r4, VCPU_SPRG1(r9) |
| std r5, VCPU_SPRG2(r9) |
| std r6, VCPU_SPRG3(r9) |
| |
| /* save FP state */ |
| mr r3, r9 |
| bl .kvmppc_save_fp |
| |
| /* Increment yield count if they have a VPA */ |
| ld r8, VCPU_VPA(r9) /* do they have a VPA? */ |
| cmpdi r8, 0 |
| beq 25f |
| lwz r3, LPPACA_YIELDCOUNT(r8) |
| addi r3, r3, 1 |
| stw r3, LPPACA_YIELDCOUNT(r8) |
| 25: |
| /* Save PMU registers if requested */ |
| /* r8 and cr0.eq are live here */ |
| li r3, 1 |
| sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */ |
| mfspr r4, SPRN_MMCR0 /* save MMCR0 */ |
| mtspr SPRN_MMCR0, r3 /* freeze all counters, disable ints */ |
| mfspr r6, SPRN_MMCRA |
| BEGIN_FTR_SECTION |
| /* On P7, clear MMCRA in order to disable SDAR updates */ |
| li r7, 0 |
| mtspr SPRN_MMCRA, r7 |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) |
| isync |
| beq 21f /* if no VPA, save PMU stuff anyway */ |
| lbz r7, LPPACA_PMCINUSE(r8) |
| cmpwi r7, 0 /* did they ask for PMU stuff to be saved? */ |
| bne 21f |
| std r3, VCPU_MMCR(r9) /* if not, set saved MMCR0 to FC */ |
| b 22f |
| 21: mfspr r5, SPRN_MMCR1 |
| std r4, VCPU_MMCR(r9) |
| std r5, VCPU_MMCR + 8(r9) |
| std r6, VCPU_MMCR + 16(r9) |
| mfspr r3, SPRN_PMC1 |
| mfspr r4, SPRN_PMC2 |
| mfspr r5, SPRN_PMC3 |
| mfspr r6, SPRN_PMC4 |
| mfspr r7, SPRN_PMC5 |
| mfspr r8, SPRN_PMC6 |
| BEGIN_FTR_SECTION |
| mfspr r10, SPRN_PMC7 |
| mfspr r11, SPRN_PMC8 |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) |
| stw r3, VCPU_PMC(r9) |
| stw r4, VCPU_PMC + 4(r9) |
| stw r5, VCPU_PMC + 8(r9) |
| stw r6, VCPU_PMC + 12(r9) |
| stw r7, VCPU_PMC + 16(r9) |
| stw r8, VCPU_PMC + 20(r9) |
| BEGIN_FTR_SECTION |
| stw r10, VCPU_PMC + 24(r9) |
| stw r11, VCPU_PMC + 28(r9) |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) |
| 22: |
| |
| /* Secondary threads go off to take a nap on POWER7 */ |
| BEGIN_FTR_SECTION |
| lwz r0,VCPU_PTID(r9) |
| cmpwi r0,0 |
| bne secondary_nap |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) |
| |
| /* Restore host DABR and DABRX */ |
| ld r5,HSTATE_DABR(r13) |
| li r6,7 |
| mtspr SPRN_DABR,r5 |
| mtspr SPRN_DABRX,r6 |
| |
| /* Restore SPRG3 */ |
| ld r3,PACA_SPRG3(r13) |
| mtspr SPRN_SPRG3,r3 |
| |
| /* |
| * Reload DEC. HDEC interrupts were disabled when |
| * we reloaded the host's LPCR value. |
| */ |
| ld r3, HSTATE_DECEXP(r13) |
| mftb r4 |
| subf r4, r4, r3 |
| mtspr SPRN_DEC, r4 |
| |
| /* Reload the host's PMU registers */ |
| ld r3, PACALPPACAPTR(r13) /* is the host using the PMU? */ |
| lbz r4, LPPACA_PMCINUSE(r3) |
| cmpwi r4, 0 |
| beq 23f /* skip if not */ |
| lwz r3, HSTATE_PMC(r13) |
| lwz r4, HSTATE_PMC + 4(r13) |
| lwz r5, HSTATE_PMC + 8(r13) |
| lwz r6, HSTATE_PMC + 12(r13) |
| lwz r8, HSTATE_PMC + 16(r13) |
| lwz r9, HSTATE_PMC + 20(r13) |
| BEGIN_FTR_SECTION |
| lwz r10, HSTATE_PMC + 24(r13) |
| lwz r11, HSTATE_PMC + 28(r13) |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) |
| mtspr SPRN_PMC1, r3 |
| mtspr SPRN_PMC2, r4 |
| mtspr SPRN_PMC3, r5 |
| mtspr SPRN_PMC4, r6 |
| mtspr SPRN_PMC5, r8 |
| mtspr SPRN_PMC6, r9 |
| BEGIN_FTR_SECTION |
| mtspr SPRN_PMC7, r10 |
| mtspr SPRN_PMC8, r11 |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) |
| ld r3, HSTATE_MMCR(r13) |
| ld r4, HSTATE_MMCR + 8(r13) |
| ld r5, HSTATE_MMCR + 16(r13) |
| mtspr SPRN_MMCR1, r4 |
| mtspr SPRN_MMCRA, r5 |
| mtspr SPRN_MMCR0, r3 |
| isync |
| 23: |
| /* |
| * For external and machine check interrupts, we need |
| * to call the Linux handler to process the interrupt. |
| * We do that by jumping to absolute address 0x500 for |
| * external interrupts, or the machine_check_fwnmi label |
| * for machine checks (since firmware might have patched |
| * the vector area at 0x200). The [h]rfid at the end of the |
| * handler will return to the book3s_hv_interrupts.S code. |
| * For other interrupts we do the rfid to get back |
| * to the book3s_hv_interrupts.S code here. |
| */ |
| ld r8, HSTATE_VMHANDLER(r13) |
| ld r7, HSTATE_HOST_MSR(r13) |
| |
| cmpwi cr1, r12, BOOK3S_INTERRUPT_MACHINE_CHECK |
| cmpwi r12, BOOK3S_INTERRUPT_EXTERNAL |
| BEGIN_FTR_SECTION |
| beq 11f |
| END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) |
| |
| /* RFI into the highmem handler, or branch to interrupt handler */ |
| mfmsr r6 |
| li r0, MSR_RI |
| andc r6, r6, r0 |
| mtmsrd r6, 1 /* Clear RI in MSR */ |
| mtsrr0 r8 |
| mtsrr1 r7 |
| beqa 0x500 /* external interrupt (PPC970) */ |
| beq cr1, 13f /* machine check */ |
| RFI |
| |
| /* On POWER7, we have external interrupts set to use HSRR0/1 */ |
| 11: mtspr SPRN_HSRR0, r8 |
| mtspr SPRN_HSRR1, r7 |
| ba 0x500 |
| |
| 13: b machine_check_fwnmi |
| |
| /* |
| * Check whether an HDSI is an HPTE not found fault or something else. |
| * If it is an HPTE not found fault that is due to the guest accessing |
| * a page that they have mapped but which we have paged out, then |
| * we continue on with the guest exit path. In all other cases, |
| * reflect the HDSI to the guest as a DSI. |
| */ |
| kvmppc_hdsi: |
| mfspr r4, SPRN_HDAR |
| mfspr r6, SPRN_HDSISR |
| /* HPTE not found fault or protection fault? */ |
| andis. r0, r6, (DSISR_NOHPTE | DSISR_PROTFAULT)@h |
| beq 1f /* if not, send it to the guest */ |
| andi. r0, r11, MSR_DR /* data relocation enabled? */ |
| beq 3f |
| clrrdi r0, r4, 28 |
| PPC_SLBFEE_DOT(R5, R0) /* if so, look up SLB */ |
| bne 1f /* if no SLB entry found */ |
| 4: std r4, VCPU_FAULT_DAR(r9) |
| stw r6, VCPU_FAULT_DSISR(r9) |
| |
| /* Search the hash table. */ |
| mr r3, r9 /* vcpu pointer */ |
| li r7, 1 /* data fault */ |
| bl .kvmppc_hpte_hv_fault |
| ld r9, HSTATE_KVM_VCPU(r13) |
| ld r10, VCPU_PC(r9) |
| ld r11, VCPU_MSR(r9) |
| li r12, BOOK3S_INTERRUPT_H_DATA_STORAGE |
| cmpdi r3, 0 /* retry the instruction */ |
| beq 6f |
| cmpdi r3, -1 /* handle in kernel mode */ |
| beq guest_exit_cont |
| cmpdi r3, -2 /* MMIO emulation; need instr word */ |
| beq 2f |
| |
| /* Synthesize a DSI for the guest */ |
| ld r4, VCPU_FAULT_DAR(r9) |
| mr r6, r3 |
| 1: mtspr SPRN_DAR, r4 |
| mtspr SPRN_DSISR, r6 |
| mtspr SPRN_SRR0, r10 |
| mtspr SPRN_SRR1, r11 |
| li r10, BOOK3S_INTERRUPT_DATA_STORAGE |
| li r11, (MSR_ME << 1) | 1 /* synthesize MSR_SF | MSR_ME */ |
| rotldi r11, r11, 63 |
| fast_interrupt_c_return: |
| 6: ld r7, VCPU_CTR(r9) |
| lwz r8, VCPU_XER(r9) |
| mtctr r7 |
| mtxer r8 |
| mr r4, r9 |
| b fast_guest_return |
| |
| 3: ld r5, VCPU_KVM(r9) /* not relocated, use VRMA */ |
| ld r5, KVM_VRMA_SLB_V(r5) |
| b 4b |
| |
| /* If this is for emulated MMIO, load the instruction word */ |
| 2: li r8, KVM_INST_FETCH_FAILED /* In case lwz faults */ |
| |
| /* Set guest mode to 'jump over instruction' so if lwz faults |
| * we'll just continue at the next IP. */ |
| li r0, KVM_GUEST_MODE_SKIP |
| stb r0, HSTATE_IN_GUEST(r13) |
| |
| /* Do the access with MSR:DR enabled */ |
| mfmsr r3 |
| ori r4, r3, MSR_DR /* Enable paging for data */ |
| mtmsrd r4 |
| lwz r8, 0(r10) |
| mtmsrd r3 |
| |
| /* Store the result */ |
| stw r8, VCPU_LAST_INST(r9) |
| |
| /* Unset guest mode. */ |
| li r0, KVM_GUEST_MODE_NONE |
| stb r0, HSTATE_IN_GUEST(r13) |
| b guest_exit_cont |
| |
| /* |
| * Similarly for an HISI, reflect it to the guest as an ISI unless |
| * it is an HPTE not found fault for a page that we have paged out. |
| */ |
| kvmppc_hisi: |
| andis. r0, r11, SRR1_ISI_NOPT@h |
| beq 1f |
| andi. r0, r11, MSR_IR /* instruction relocation enabled? */ |
| beq 3f |
| clrrdi r0, r10, 28 |
| PPC_SLBFEE_DOT(R5, R0) /* if so, look up SLB */ |
| bne 1f /* if no SLB entry found */ |
| 4: |
| /* Search the hash table. */ |
| mr r3, r9 /* vcpu pointer */ |
| mr r4, r10 |
| mr r6, r11 |
| li r7, 0 /* instruction fault */ |
| bl .kvmppc_hpte_hv_fault |
| ld r9, HSTATE_KVM_VCPU(r13) |
| ld r10, VCPU_PC(r9) |
| ld r11, VCPU_MSR(r9) |
| li r12, BOOK3S_INTERRUPT_H_INST_STORAGE |
| cmpdi r3, 0 /* retry the instruction */ |
| beq fast_interrupt_c_return |
| cmpdi r3, -1 /* handle in kernel mode */ |
| beq guest_exit_cont |
| |
| /* Synthesize an ISI for the guest */ |
| mr r11, r3 |
| 1: mtspr SPRN_SRR0, r10 |
| mtspr SPRN_SRR1, r11 |
| li r10, BOOK3S_INTERRUPT_INST_STORAGE |
| li r11, (MSR_ME << 1) | 1 /* synthesize MSR_SF | MSR_ME */ |
| rotldi r11, r11, 63 |
| b fast_interrupt_c_return |
| |
| 3: ld r6, VCPU_KVM(r9) /* not relocated, use VRMA */ |
| ld r5, KVM_VRMA_SLB_V(r6) |
| b 4b |
| |
| /* |
| * Try to handle an hcall in real mode. |
| * Returns to the guest if we handle it, or continues on up to |
| * the kernel if we can't (i.e. if we don't have a handler for |
| * it, or if the handler returns H_TOO_HARD). |
| */ |
| .globl hcall_try_real_mode |
| hcall_try_real_mode: |
| ld r3,VCPU_GPR(R3)(r9) |
| andi. r0,r11,MSR_PR |
| bne guest_exit_cont |
| clrrdi r3,r3,2 |
| cmpldi r3,hcall_real_table_end - hcall_real_table |
| bge guest_exit_cont |
| LOAD_REG_ADDR(r4, hcall_real_table) |
| lwzx r3,r3,r4 |
| cmpwi r3,0 |
| beq guest_exit_cont |
| add r3,r3,r4 |
| mtctr r3 |
| mr r3,r9 /* get vcpu pointer */ |
| ld r4,VCPU_GPR(R4)(r9) |
| bctrl |
| cmpdi r3,H_TOO_HARD |
| beq hcall_real_fallback |
| ld r4,HSTATE_KVM_VCPU(r13) |
| std r3,VCPU_GPR(R3)(r4) |
| ld r10,VCPU_PC(r4) |
| ld r11,VCPU_MSR(r4) |
| b fast_guest_return |
| |
| /* We've attempted a real mode hcall, but it's punted it back |
| * to userspace. We need to restore some clobbered volatiles |
| * before resuming the pass-it-to-qemu path */ |
| hcall_real_fallback: |
| li r12,BOOK3S_INTERRUPT_SYSCALL |
| ld r9, HSTATE_KVM_VCPU(r13) |
| |
| b guest_exit_cont |
| |
| .globl hcall_real_table |
| hcall_real_table: |
| .long 0 /* 0 - unused */ |
| .long .kvmppc_h_remove - hcall_real_table |
| .long .kvmppc_h_enter - hcall_real_table |
| .long .kvmppc_h_read - hcall_real_table |
| .long 0 /* 0x10 - H_CLEAR_MOD */ |
| .long 0 /* 0x14 - H_CLEAR_REF */ |
| .long .kvmppc_h_protect - hcall_real_table |
| .long 0 /* 0x1c - H_GET_TCE */ |
| .long .kvmppc_h_put_tce - hcall_real_table |
| .long 0 /* 0x24 - H_SET_SPRG0 */ |
| .long .kvmppc_h_set_dabr - hcall_real_table |
| .long 0 /* 0x2c */ |
| .long 0 /* 0x30 */ |
| .long 0 /* 0x34 */ |
| .long 0 /* 0x38 */ |
| .long 0 /* 0x3c */ |
| .long 0 /* 0x40 */ |
| .long 0 /* 0x44 */ |
| .long 0 /* 0x48 */ |
| .long 0 /* 0x4c */ |
| .long 0 /* 0x50 */ |
| .long 0 /* 0x54 */ |
| .long 0 /* 0x58 */ |
| .long 0 /* 0x5c */ |
| .long 0 /* 0x60 */ |
| .long 0 /* 0x64 */ |
| .long 0 /* 0x68 */ |
| .long 0 /* 0x6c */ |
| .long 0 /* 0x70 */ |
| .long 0 /* 0x74 */ |
| .long 0 /* 0x78 */ |
| .long 0 /* 0x7c */ |
| .long 0 /* 0x80 */ |
| .long 0 /* 0x84 */ |
| .long 0 /* 0x88 */ |
| .long 0 /* 0x8c */ |
| .long 0 /* 0x90 */ |
| .long 0 /* 0x94 */ |
| .long 0 /* 0x98 */ |
| .long 0 /* 0x9c */ |
| .long 0 /* 0xa0 */ |
| .long 0 /* 0xa4 */ |
| .long 0 /* 0xa8 */ |
| .long 0 /* 0xac */ |
| .long 0 /* 0xb0 */ |
| .long 0 /* 0xb4 */ |
| .long 0 /* 0xb8 */ |
| .long 0 /* 0xbc */ |
| .long 0 /* 0xc0 */ |
| .long 0 /* 0xc4 */ |
| .long 0 /* 0xc8 */ |
| .long 0 /* 0xcc */ |
| .long 0 /* 0xd0 */ |
| .long 0 /* 0xd4 */ |
| .long 0 /* 0xd8 */ |
| .long 0 /* 0xdc */ |
| .long .kvmppc_h_cede - hcall_real_table |
| .long 0 /* 0xe4 */ |
| .long 0 /* 0xe8 */ |
| .long 0 /* 0xec */ |
| .long 0 /* 0xf0 */ |
| .long 0 /* 0xf4 */ |
| .long 0 /* 0xf8 */ |
| .long 0 /* 0xfc */ |
| .long 0 /* 0x100 */ |
| .long 0 /* 0x104 */ |
| .long 0 /* 0x108 */ |
| .long 0 /* 0x10c */ |
| .long 0 /* 0x110 */ |
| .long 0 /* 0x114 */ |
| .long 0 /* 0x118 */ |
| .long 0 /* 0x11c */ |
| .long 0 /* 0x120 */ |
| .long .kvmppc_h_bulk_remove - hcall_real_table |
| hcall_real_table_end: |
| |
| ignore_hdec: |
| mr r4,r9 |
| b fast_guest_return |
| |
| bounce_ext_interrupt: |
| mr r4,r9 |
| mtspr SPRN_SRR0,r10 |
| mtspr SPRN_SRR1,r11 |
| li r10,BOOK3S_INTERRUPT_EXTERNAL |
| li r11,(MSR_ME << 1) | 1 /* synthesize MSR_SF | MSR_ME */ |
| rotldi r11,r11,63 |
| b fast_guest_return |
| |
| _GLOBAL(kvmppc_h_set_dabr) |
| std r4,VCPU_DABR(r3) |
| /* Work around P7 bug where DABR can get corrupted on mtspr */ |
| 1: mtspr SPRN_DABR,r4 |
| mfspr r5, SPRN_DABR |
| cmpd r4, r5 |
| bne 1b |
| isync |
| li r3,0 |
| blr |
| |
| _GLOBAL(kvmppc_h_cede) |
| ori r11,r11,MSR_EE |
| std r11,VCPU_MSR(r3) |
| li r0,1 |
| stb r0,VCPU_CEDED(r3) |
| sync /* order setting ceded vs. testing prodded */ |
| lbz r5,VCPU_PRODDED(r3) |
| cmpwi r5,0 |
| bne kvm_cede_prodded |
| li r0,0 /* set trap to 0 to say hcall is handled */ |
| stw r0,VCPU_TRAP(r3) |
| li r0,H_SUCCESS |
| std r0,VCPU_GPR(R3)(r3) |
| BEGIN_FTR_SECTION |
| b kvm_cede_exit /* just send it up to host on 970 */ |
| END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_206) |
| |
| /* |
| * Set our bit in the bitmask of napping threads unless all the |
| * other threads are already napping, in which case we send this |
| * up to the host. |
| */ |
| ld r5,HSTATE_KVM_VCORE(r13) |
| lwz r6,VCPU_PTID(r3) |
| lwz r8,VCORE_ENTRY_EXIT(r5) |
| clrldi r8,r8,56 |
| li r0,1 |
| sld r0,r0,r6 |
| addi r6,r5,VCORE_NAPPING_THREADS |
| 31: lwarx r4,0,r6 |
| or r4,r4,r0 |
| PPC_POPCNTW(R7,R4) |
| cmpw r7,r8 |
| bge kvm_cede_exit |
| stwcx. r4,0,r6 |
| bne 31b |
| li r0,1 |
| stb r0,HSTATE_NAPPING(r13) |
| /* order napping_threads update vs testing entry_exit_count */ |
| lwsync |
| mr r4,r3 |
| lwz r7,VCORE_ENTRY_EXIT(r5) |
| cmpwi r7,0x100 |
| bge 33f /* another thread already exiting */ |
| |
| /* |
| * Although not specifically required by the architecture, POWER7 |
| * preserves the following registers in nap mode, even if an SMT mode |
| * switch occurs: SLB entries, PURR, SPURR, AMOR, UAMOR, AMR, SPRG0-3, |
| * DAR, DSISR, DABR, DABRX, DSCR, PMCx, MMCRx, SIAR, SDAR. |
| */ |
| /* Save non-volatile GPRs */ |
| std r14, VCPU_GPR(R14)(r3) |
| std r15, VCPU_GPR(R15)(r3) |
| std r16, VCPU_GPR(R16)(r3) |
| std r17, VCPU_GPR(R17)(r3) |
| std r18, VCPU_GPR(R18)(r3) |
| std r19, VCPU_GPR(R19)(r3) |
| std r20, VCPU_GPR(R20)(r3) |
| std r21, VCPU_GPR(R21)(r3) |
| std r22, VCPU_GPR(R22)(r3) |
| std r23, VCPU_GPR(R23)(r3) |
| std r24, VCPU_GPR(R24)(r3) |
| std r25, VCPU_GPR(R25)(r3) |
| std r26, VCPU_GPR(R26)(r3) |
| std r27, VCPU_GPR(R27)(r3) |
| std r28, VCPU_GPR(R28)(r3) |
| std r29, VCPU_GPR(R29)(r3) |
| std r30, VCPU_GPR(R30)(r3) |
| std r31, VCPU_GPR(R31)(r3) |
| |
| /* save FP state */ |
| bl .kvmppc_save_fp |
| |
| /* |
| * Take a nap until a decrementer or external interrupt occurs, |
| * with PECE1 (wake on decr) and PECE0 (wake on external) set in LPCR |
| */ |
| li r0,1 |
| stb r0,HSTATE_HWTHREAD_REQ(r13) |
| mfspr r5,SPRN_LPCR |
| ori r5,r5,LPCR_PECE0 | LPCR_PECE1 |
| mtspr SPRN_LPCR,r5 |
| isync |
| li r0, 0 |
| std r0, HSTATE_SCRATCH0(r13) |
| ptesync |
| ld r0, HSTATE_SCRATCH0(r13) |
| 1: cmpd r0, r0 |
| bne 1b |
| nap |
| b . |
| |
| kvm_end_cede: |
| /* Woken by external or decrementer interrupt */ |
| ld r1, HSTATE_HOST_R1(r13) |
| |
| /* load up FP state */ |
| bl kvmppc_load_fp |
| |
| /* Load NV GPRS */ |
| ld r14, VCPU_GPR(R14)(r4) |
| ld r15, VCPU_GPR(R15)(r4) |
| ld r16, VCPU_GPR(R16)(r4) |
| ld r17, VCPU_GPR(R17)(r4) |
| ld r18, VCPU_GPR(R18)(r4) |
| ld r19, VCPU_GPR(R19)(r4) |
| ld r20, VCPU_GPR(R20)(r4) |
| ld r21, VCPU_GPR(R21)(r4) |
| ld r22, VCPU_GPR(R22)(r4) |
| ld r23, VCPU_GPR(R23)(r4) |
| ld r24, VCPU_GPR(R24)(r4) |
| ld r25, VCPU_GPR(R25)(r4) |
| ld r26, VCPU_GPR(R26)(r4) |
| ld r27, VCPU_GPR(R27)(r4) |
| ld r28, VCPU_GPR(R28)(r4) |
| ld r29, VCPU_GPR(R29)(r4) |
| ld r30, VCPU_GPR(R30)(r4) |
| ld r31, VCPU_GPR(R31)(r4) |
| |
| /* clear our bit in vcore->napping_threads */ |
| 33: ld r5,HSTATE_KVM_VCORE(r13) |
| lwz r3,VCPU_PTID(r4) |
| li r0,1 |
| sld r0,r0,r3 |
| addi r6,r5,VCORE_NAPPING_THREADS |
| 32: lwarx r7,0,r6 |
| andc r7,r7,r0 |
| stwcx. r7,0,r6 |
| bne 32b |
| li r0,0 |
| stb r0,HSTATE_NAPPING(r13) |
| |
| /* see if any other thread is already exiting */ |
| lwz r0,VCORE_ENTRY_EXIT(r5) |
| cmpwi r0,0x100 |
| blt kvmppc_cede_reentry /* if not go back to guest */ |
| |
| /* some threads are exiting, so go to the guest exit path */ |
| b hcall_real_fallback |
| |
| /* cede when already previously prodded case */ |
| kvm_cede_prodded: |
| li r0,0 |
| stb r0,VCPU_PRODDED(r3) |
| sync /* order testing prodded vs. clearing ceded */ |
| stb r0,VCPU_CEDED(r3) |
| li r3,H_SUCCESS |
| blr |
| |
| /* we've ceded but we want to give control to the host */ |
| kvm_cede_exit: |
| li r3,H_TOO_HARD |
| blr |
| |
| /* Try to handle a machine check in real mode */ |
| machine_check_realmode: |
| mr r3, r9 /* get vcpu pointer */ |
| bl .kvmppc_realmode_machine_check |
| nop |
| cmpdi r3, 0 /* continue exiting from guest? */ |
| ld r9, HSTATE_KVM_VCPU(r13) |
| li r12, BOOK3S_INTERRUPT_MACHINE_CHECK |
| beq mc_cont |
| /* If not, deliver a machine check. SRR0/1 are already set */ |
| li r10, BOOK3S_INTERRUPT_MACHINE_CHECK |
| li r11, (MSR_ME << 1) | 1 /* synthesize MSR_SF | MSR_ME */ |
| rotldi r11, r11, 63 |
| b fast_interrupt_c_return |
| |
| secondary_too_late: |
| ld r5,HSTATE_KVM_VCORE(r13) |
| HMT_LOW |
| 13: lbz r3,VCORE_IN_GUEST(r5) |
| cmpwi r3,0 |
| bne 13b |
| HMT_MEDIUM |
| ld r11,PACA_SLBSHADOWPTR(r13) |
| |
| .rept SLB_NUM_BOLTED |
| ld r5,SLBSHADOW_SAVEAREA(r11) |
| ld r6,SLBSHADOW_SAVEAREA+8(r11) |
| andis. r7,r5,SLB_ESID_V@h |
| beq 1f |
| slbmte r6,r5 |
| 1: addi r11,r11,16 |
| .endr |
| |
| secondary_nap: |
| /* Clear our vcpu pointer so we don't come back in early */ |
| li r0, 0 |
| std r0, HSTATE_KVM_VCPU(r13) |
| lwsync |
| /* Clear any pending IPI - assume we're a secondary thread */ |
| ld r5, HSTATE_XICS_PHYS(r13) |
| li r7, XICS_XIRR |
| lwzcix r3, r5, r7 /* ack any pending interrupt */ |
| rlwinm. r0, r3, 0, 0xffffff /* any pending? */ |
| beq 37f |
| sync |
| li r0, 0xff |
| li r6, XICS_QIRR |
| stbcix r0, r5, r6 /* clear the IPI */ |
| stwcix r3, r5, r7 /* EOI it */ |
| 37: sync |
| |
| /* increment the nap count and then go to nap mode */ |
| ld r4, HSTATE_KVM_VCORE(r13) |
| addi r4, r4, VCORE_NAP_COUNT |
| lwsync /* make previous updates visible */ |
| 51: lwarx r3, 0, r4 |
| addi r3, r3, 1 |
| stwcx. r3, 0, r4 |
| bne 51b |
| |
| kvm_no_guest: |
| li r0, KVM_HWTHREAD_IN_NAP |
| stb r0, HSTATE_HWTHREAD_STATE(r13) |
| |
| li r3, LPCR_PECE0 |
| mfspr r4, SPRN_LPCR |
| rlwimi r4, r3, 0, LPCR_PECE0 | LPCR_PECE1 |
| mtspr SPRN_LPCR, r4 |
| isync |
| std r0, HSTATE_SCRATCH0(r13) |
| ptesync |
| ld r0, HSTATE_SCRATCH0(r13) |
| 1: cmpd r0, r0 |
| bne 1b |
| nap |
| b . |
| |
| /* |
| * Save away FP, VMX and VSX registers. |
| * r3 = vcpu pointer |
| */ |
| _GLOBAL(kvmppc_save_fp) |
| mfmsr r5 |
| ori r8,r5,MSR_FP |
| #ifdef CONFIG_ALTIVEC |
| BEGIN_FTR_SECTION |
| oris r8,r8,MSR_VEC@h |
| END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) |
| #endif |
| #ifdef CONFIG_VSX |
| BEGIN_FTR_SECTION |
| oris r8,r8,MSR_VSX@h |
| END_FTR_SECTION_IFSET(CPU_FTR_VSX) |
| #endif |
| mtmsrd r8 |
| isync |
| #ifdef CONFIG_VSX |
| BEGIN_FTR_SECTION |
| reg = 0 |
| .rept 32 |
| li r6,reg*16+VCPU_VSRS |
| STXVD2X(reg,R6,R3) |
| reg = reg + 1 |
| .endr |
| FTR_SECTION_ELSE |
| #endif |
| reg = 0 |
| .rept 32 |
| stfd reg,reg*8+VCPU_FPRS(r3) |
| reg = reg + 1 |
| .endr |
| #ifdef CONFIG_VSX |
| ALT_FTR_SECTION_END_IFSET(CPU_FTR_VSX) |
| #endif |
| mffs fr0 |
| stfd fr0,VCPU_FPSCR(r3) |
| |
| #ifdef CONFIG_ALTIVEC |
| BEGIN_FTR_SECTION |
| reg = 0 |
| .rept 32 |
| li r6,reg*16+VCPU_VRS |
| stvx reg,r6,r3 |
| reg = reg + 1 |
| .endr |
| mfvscr vr0 |
| li r6,VCPU_VSCR |
| stvx vr0,r6,r3 |
| END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) |
| #endif |
| mfspr r6,SPRN_VRSAVE |
| stw r6,VCPU_VRSAVE(r3) |
| mtmsrd r5 |
| isync |
| blr |
| |
| /* |
| * Load up FP, VMX and VSX registers |
| * r4 = vcpu pointer |
| */ |
| .globl kvmppc_load_fp |
| kvmppc_load_fp: |
| mfmsr r9 |
| ori r8,r9,MSR_FP |
| #ifdef CONFIG_ALTIVEC |
| BEGIN_FTR_SECTION |
| oris r8,r8,MSR_VEC@h |
| END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) |
| #endif |
| #ifdef CONFIG_VSX |
| BEGIN_FTR_SECTION |
| oris r8,r8,MSR_VSX@h |
| END_FTR_SECTION_IFSET(CPU_FTR_VSX) |
| #endif |
| mtmsrd r8 |
| isync |
| lfd fr0,VCPU_FPSCR(r4) |
| MTFSF_L(fr0) |
| #ifdef CONFIG_VSX |
| BEGIN_FTR_SECTION |
| reg = 0 |
| .rept 32 |
| li r7,reg*16+VCPU_VSRS |
| LXVD2X(reg,R7,R4) |
| reg = reg + 1 |
| .endr |
| FTR_SECTION_ELSE |
| #endif |
| reg = 0 |
| .rept 32 |
| lfd reg,reg*8+VCPU_FPRS(r4) |
| reg = reg + 1 |
| .endr |
| #ifdef CONFIG_VSX |
| ALT_FTR_SECTION_END_IFSET(CPU_FTR_VSX) |
| #endif |
| |
| #ifdef CONFIG_ALTIVEC |
| BEGIN_FTR_SECTION |
| li r7,VCPU_VSCR |
| lvx vr0,r7,r4 |
| mtvscr vr0 |
| reg = 0 |
| .rept 32 |
| li r7,reg*16+VCPU_VRS |
| lvx reg,r7,r4 |
| reg = reg + 1 |
| .endr |
| END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) |
| #endif |
| lwz r7,VCPU_VRSAVE(r4) |
| mtspr SPRN_VRSAVE,r7 |
| blr |
