diff options
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv_rmhandlers.S')
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv_rmhandlers.S | 1345 |
1 files changed, 1345 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S new file mode 100644 index 000000000000..6dd33581a228 --- /dev/null +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -0,0 +1,1345 @@ +/* + * 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/page.h> +#include <asm/asm-offsets.h> +#include <asm/exception-64s.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_handler_trampoline_enter 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 + +#define ULONG_SIZE 8 +#define VCPU_GPR(n) (VCPU_GPRS + (n * ULONG_SIZE)) + +/****************************************************************************** + * * + * Entry code * + * * + *****************************************************************************/ + +#define XICS_XIRR 4 +#define XICS_QIRR 0xc + +/* + * 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 + + /* get vcpu pointer */ + ld r4, HSTATE_KVM_VCPU(r13) + + /* We got here with an IPI; clear it */ + ld r5, HSTATE_XICS_PHYS(r13) + li r0, 0xff + li r6, XICS_QIRR + li r7, XICS_XIRR + lwzcix r8, r5, r7 /* ack the interrupt */ + sync + stbcix r0, r5, r6 /* clear it */ + stwcix r8, r5, r7 /* EOI it */ + +.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) + + 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) + + /* 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 + +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 + + /* Set partition DABR */ + li r5,3 + ld r6,VCPU_DABR(r4) + mtspr SPRN_DABRX,r5 + mtspr SPRN_DABR,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 + 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. Set the MER bit if there is a pending external irq. */ +10: ld r8,KVM_LPCR(r9) + ld r0,VCPU_PENDING_EXC(r4) + li r7,(1 << BOOK3S_IRQPRIO_EXTERNAL) + oris r7,r7,(1 << BOOK3S_IRQPRIO_EXTERNAL_LEVEL)@h + and. r0,r0,r7 + beq 11f + ori r8,r8,LPCR_MER +11: 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 + + /* + * Invalidate the TLB if we could possibly have stale TLB + * entries for this partition on this core due to the use + * of tlbiel. + * XXX maybe only need this on primary thread? + */ + ld r9,VCPU_KVM(r4) /* pointer to struct kvm */ + lwz r5,VCPU_VCPUID(r4) + lhz r6,PACAPACAINDEX(r13) + rldimi r6,r5,0,62 /* XXX map as if threads 1:1 p:v */ + lhz r8,VCPU_LAST_CPU(r4) + sldi r7,r6,1 /* see if this is the same vcpu */ + add r7,r7,r9 /* as last ran on this pcpu */ + lhz r0,KVM_LAST_VCPU(r7) + cmpw r6,r8 /* on the same cpu core as last time? */ + bne 3f + cmpw r0,r5 /* same vcpu as this core last ran? */ + beq 1f +3: sth r6,VCPU_LAST_CPU(r4) /* if not, invalidate partition TLB */ + sth r5,KVM_LAST_VCPU(r7) + li r6,128 + mtctr r6 + li r7,0x800 /* IS field = 0b10 */ + ptesync +2: tlbiel r7 + addi r7,r7,0x1000 + bdnz 2b + ptesync +1: + + /* 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 + + /* Move SRR0 and SRR1 into the respective regs */ + ld r6, VCPU_SRR0(r4) + ld r7, VCPU_SRR1(r4) + mtspr SPRN_SRR0, r6 + mtspr SPRN_SRR1, r7 + + ld r10, VCPU_PC(r4) + + ld r11, VCPU_MSR(r4) /* r10 = 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 + +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) + + /* 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 something we can handle in real mode */ + cmpwi r12,BOOK3S_INTERRUPT_SYSCALL + beq hcall_try_real_mode +hcall_real_cont: + + /* Check for mediated interrupts (could be done earlier really ...) */ +BEGIN_FTR_SECTION + cmpwi r12,BOOK3S_INTERRUPT_EXTERNAL + bne+ 1f + ld r5,VCPU_KVM(r9) + ld r5,KVM_LPCR(r5) + andi. r0,r11,MSR_EE + beq 1f + andi. r0,r5,LPCR_MER + bne bounce_ext_interrupt +1: +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) + + /* Save DEC */ + mfspr r5,SPRN_DEC + mftb r6 + extsw r5,r5 + add r5,r5,r6 + std r5,VCPU_DEC_EXPIRES(r9) + + /* Save HEIR (HV emulation assist reg) in last_inst + if this is an HEI (HV emulation interrupt, e40) */ + li r3,-1 +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) + + /* Save more register state */ + mfxer r5 + mfdar r6 + mfdsisr r7 + mfctr r8 + + stw r5, VCPU_XER(r9) + std r6, VCPU_DAR(r9) + stw r7, VCPU_DSISR(r9) + std r8, VCPU_CTR(r9) + /* grab HDAR & HDSISR if HV data storage interrupt (HDSI) */ +BEGIN_FTR_SECTION + cmpwi r12,BOOK3S_INTERRUPT_H_DATA_STORAGE + beq 6f +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) +7: std r6, VCPU_FAULT_DAR(r9) + stw r7, VCPU_FAULT_DSISR(r9) + + /* Save guest CTRL register, set runlatch to 1 */ + 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: +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 + + /* + * 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 r12,BOOK3S_INTERRUPT_HV_DECREMENTER + beq 40f + cmpwi r3,0x100 /* Are we the first here? */ + bge 40f + cmpwi r3,1 + ble 40f + li r0,0 + mtspr SPRN_HDEC,r0 +40: + + /* Secondary threads wait for primary to do partition switch */ + 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) + + /* Restore host DABR and DABRX */ + ld r5,HSTATE_DABR(r13) + li r6,7 + mtspr SPRN_DABR,r5 + mtspr SPRN_DABRX,r6 + + /* 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) + + /* 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 */ + 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 + mfspr r6, SPRN_MMCRA + 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: + /* save FP state */ + mr r3, r9 + bl .kvmppc_save_fp + + /* Secondary threads go off to take a nap on POWER7 */ +BEGIN_FTR_SECTION + lwz r0,VCPU_PTID(r3) + cmpwi r0,0 + bne secondary_nap +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) + + /* + * 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 the interrupt vector address + * which we have in r12. 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_interrupts.S code here. + */ + ld r8, HSTATE_VMHANDLER(r13) + ld r7, HSTATE_HOST_MSR(r13) + + cmpwi r12, BOOK3S_INTERRUPT_EXTERNAL + beq 11f + cmpwi r12, BOOK3S_INTERRUPT_MACHINE_CHECK + + /* RFI into the highmem handler, or branch to interrupt handler */ +12: mfmsr r6 + mtctr r12 + li r0, MSR_RI + andc r6, r6, r0 + mtmsrd r6, 1 /* Clear RI in MSR */ + mtsrr0 r8 + mtsrr1 r7 + beqctr + RFI + +11: +BEGIN_FTR_SECTION + b 12b +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) + mtspr SPRN_HSRR0, r8 + mtspr SPRN_HSRR1, r7 + ba 0x500 + +6: mfspr r6,SPRN_HDAR + mfspr r7,SPRN_HDSISR + b 7b + +/* + * 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 hcall_real_cont + clrrdi r3,r3,2 + cmpldi r3,hcall_real_table_end - hcall_real_table + bge hcall_real_cont + LOAD_REG_ADDR(r4, hcall_real_table) + lwzx r3,r3,r4 + cmpwi r3,0 + beq hcall_real_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) + ld r11, VCPU_MSR(r9) + + b hcall_real_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 0 /* 0xe0 */ + .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 + LOAD_REG_IMMEDIATE(r11,MSR_SF | MSR_ME); + b fast_guest_return + +_GLOBAL(kvmppc_h_set_dabr) + std r4,VCPU_DABR(r3) + mtspr SPRN_DABR,r4 + li r3,0 + blr + +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 + b 50f + +secondary_nap: + /* Clear any pending IPI */ +50: ld r5, HSTATE_XICS_PHYS(r13) + li r0, 0xff + li r6, XICS_QIRR + stbcix r0, r5, r6 + + /* 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 + isync + + mfspr r4, SPRN_LPCR + li r0, LPCR_PECE + andc r4, r4, r0 + ori r4, r4, LPCR_PECE0 /* exit nap on interrupt */ + mtspr SPRN_LPCR, r4 + li r0, 0 + 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 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 +#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 r9 + 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 |