/* * 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. * * Derived from book3s_rmhandlers.S and other files, which are: * * Copyright SUSE Linux Products GmbH 2009 * * Authors: Alexander Graf */ #include #include #include #include #include #include #include #include #include #include #include #include #define VCPU_GPRS_TM(reg) (((reg) * ULONG_SIZE) + VCPU_GPR_TM) /* Values in HSTATE_NAPPING(r13) */ #define NAPPING_CEDE 1 #define NAPPING_NOVCPU 2 /* * 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_TOC(kvmppc_hv_entry_trampoline) mflr r0 std r0, PPC_LR_STKOFF(r1) stdu r1, -112(r1) mfmsr r10 LOAD_REG_ADDR(r5, kvmppc_call_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 kvmppc_call_hv_entry: ld r4, HSTATE_KVM_VCPU(r13) bl kvmppc_hv_entry /* Back from guest - restore host state and return to caller */ BEGIN_FTR_SECTION /* Restore host DABR and DABRX */ ld r5,HSTATE_DABR(r13) li r6,7 mtspr SPRN_DABR,r5 mtspr SPRN_DABRX,r6 END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) /* Restore SPRG3 */ ld r3,PACA_SPRG_VDSO(r13) mtspr SPRN_SPRG_VDSO_WRITE,r3 /* 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 */ BEGIN_FTR_SECTION ld r3, HSTATE_MMCR(r13) andi. r4, r3, MMCR0_PMAO_SYNC | MMCR0_PMAO cmpwi r4, MMCR0_PMAO beql kvmppc_fix_pmao END_FTR_SECTION_IFSET(CPU_FTR_PMAO_BUG) 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) ld r6, HSTATE_MMCR + 24(r13) ld r7, HSTATE_MMCR + 32(r13) mtspr SPRN_MMCR1, r4 mtspr SPRN_MMCRA, r5 mtspr SPRN_SIAR, r6 mtspr SPRN_SDAR, r7 BEGIN_FTR_SECTION ld r8, HSTATE_MMCR + 40(r13) ld r9, HSTATE_MMCR + 48(r13) mtspr SPRN_MMCR2, r8 mtspr SPRN_SIER, r9 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) mtspr SPRN_MMCR0, r3 isync 23: /* * 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 /* * 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, 112+PPC_LR_STKOFF(r1) addi r1, r1, 112 ld r7, HSTATE_HOST_MSR(r13) cmpwi cr1, r12, BOOK3S_INTERRUPT_MACHINE_CHECK cmpwi r12, BOOK3S_INTERRUPT_EXTERNAL BEGIN_FTR_SECTION beq 11f cmpwi cr2, r12, BOOK3S_INTERRUPT_HMI beq cr2, 14f /* HMI check */ 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 14: mtspr SPRN_HSRR0, r8 mtspr SPRN_HSRR1, r7 b hmi_exception_after_realmode kvmppc_primary_no_guest: /* We handle this much like a ceded vcpu */ /* set our bit in napping_threads */ ld r5, HSTATE_KVM_VCORE(r13) lbz r7, HSTATE_PTID(r13) li r0, 1 sld r0, r0, r7 addi r6, r5, VCORE_NAPPING_THREADS 1: lwarx r3, 0, r6 or r3, r3, r0 stwcx. r3, 0, r6 bne 1b /* order napping_threads update vs testing entry_exit_count */ isync li r12, 0 lwz r7, VCORE_ENTRY_EXIT(r5) cmpwi r7, 0x100 bge kvm_novcpu_exit /* another thread already exiting */ li r3, NAPPING_NOVCPU stb r3, HSTATE_NAPPING(r13) li r3, 1 stb r3, HSTATE_HWTHREAD_REQ(r13) b kvm_do_nap kvm_novcpu_wakeup: ld r1, HSTATE_HOST_R1(r13) ld r5, HSTATE_KVM_VCORE(r13) li r0, 0 stb r0, HSTATE_NAPPING(r13) stb r0, HSTATE_HWTHREAD_REQ(r13) /* check the wake reason */ bl kvmppc_check_wake_reason /* see if any other thread is already exiting */ lwz r0, VCORE_ENTRY_EXIT(r5) cmpwi r0, 0x100 bge kvm_novcpu_exit /* clear our bit in napping_threads */ lbz r7, HSTATE_PTID(r13) li r0, 1 sld r0, r0, r7 addi r6, r5, VCORE_NAPPING_THREADS 4: lwarx r7, 0, r6 andc r7, r7, r0 stwcx. r7, 0, r6 bne 4b /* See if the wake reason means we need to exit */ cmpdi r3, 0 bge kvm_novcpu_exit /* Got an IPI but other vcpus aren't yet exiting, must be a latecomer */ ld r4, HSTATE_KVM_VCPU(r13) cmpdi r4, 0 bne kvmppc_got_guest kvm_novcpu_exit: b hdec_soon /* * We come in here when wakened from nap mode. * Relocation is off and most register values are lost. * r13 points to the PACA. */ .globl kvm_start_guest kvm_start_guest: /* Set runlatch bit the minute you wake up from nap */ mfspr r1, SPRN_CTRLF ori r1, r1, 1 mtspr SPRN_CTRLT, r1 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) /* were we napping due to cede? */ lbz r0,HSTATE_NAPPING(r13) cmpwi r0,NAPPING_CEDE beq kvm_end_cede cmpwi r0,NAPPING_NOVCPU beq kvm_novcpu_wakeup ld r1,PACAEMERGSP(r13) subi r1,r1,STACK_FRAME_OVERHEAD /* * We weren't napping due to cede, so this must be a secondary * thread being woken up to run a guest, or being woken up due * to a stray IPI. (Or due to some machine check or hypervisor * maintenance interrupt while the core is in KVM.) */ /* Check the wake reason in SRR1 to see why we got here */ bl kvmppc_check_wake_reason cmpdi r3, 0 bge kvm_no_guest /* get vcpu pointer, NULL if we have no vcpu to run */ ld r4,HSTATE_KVM_VCPU(r13) cmpdi r4,0 /* if we have no vcpu to run, go back to sleep */ beq kvm_no_guest /* Set HSTATE_DSCR(r13) to something sensible */ ld r6, PACA_DSCR(r13) std r6, HSTATE_DSCR(r13) bl kvmppc_hv_entry /* Back from the guest, go back to nap */ /* Clear our vcpu pointer so we don't come back in early */ li r0, 0 std r0, HSTATE_KVM_VCPU(r13) /* * Make sure we clear HSTATE_KVM_VCPU(r13) before incrementing * the nap_count, because once the increment to nap_count is * visible we could be given another vcpu. */ lwsync /* increment the nap count and then go to nap mode */ ld r4, HSTATE_KVM_VCORE(r13) addi r4, r4, VCORE_NAP_COUNT 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) kvm_do_nap: /* Clear the runlatch bit before napping */ mfspr r2, SPRN_CTRLF clrrdi r2, r2, 1 mtspr SPRN_CTRLT, r2 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 . /****************************************************************************** * * * Entry code * * * *****************************************************************************/ .global kvmppc_hv_entry kvmppc_hv_entry: /* Required state: * * R4 = vcpu pointer (or NULL) * MSR = ~IR|DR * R13 = PACA * R1 = host R1 * all other volatile GPRS = free */ mflr r0 std r0, PPC_LR_STKOFF(r1) stdu r1, -112(r1) /* Save R1 in the PACA */ std r1, HSTATE_HOST_R1(r13) li r6, KVM_GUEST_MODE_HOST_HV stb r6, HSTATE_IN_GUEST(r13) /* 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,VCORE_KVM(r5) /* pointer to struct kvm */ lbz r6,HSTATE_PTID(r13) 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 /* Flush the TLB of any entries for this LPID */ /* use arch 2.07S as a proxy for POWER8 */ BEGIN_FTR_SECTION li r6,512 /* POWER8 has 512 sets */ FTR_SECTION_ELSE li r6,128 /* POWER7 has 128 sets */ ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_207S) mtctr r6 li r7,0x800 /* IS field = 0b10 */ ptesync 28: tlbiel r7 addi r7,r7,0x1000 bdnz 28b ptesync /* Add timebase offset onto timebase */ 22: ld r8,VCORE_TB_OFFSET(r5) cmpdi r8,0 beq 37f mftb r6 /* current host timebase */ add r8,r8,r6 mtspr SPRN_TBU40,r8 /* update upper 40 bits */ mftb r7 /* check if lower 24 bits overflowed */ clrldi r6,r6,40 clrldi r7,r7,40 cmpld r7,r6 bge 37f addis r8,r8,0x100 /* if so, increment upper 40 bits */ mtspr SPRN_TBU40,r8 /* Load guest PCR value to select appropriate compat mode */ 37: ld r7, VCORE_PCR(r5) cmpdi r7, 0 beq 38f mtspr SPRN_PCR, r7 38: BEGIN_FTR_SECTION /* DPDES is shared between threads */ ld r8, VCORE_DPDES(r5) mtspr SPRN_DPDES, r8 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) 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,VCORE_LPCR(r5) mtspr SPRN_LPCR,r8 ld r8,KVM_RMOR(r9) mtspr SPRN_RMOR,r8 isync /* Check if HDEC expires soon */ mfspr r3,SPRN_HDEC cmpwi r3,512 /* 1 microsecond */ li r12,BOOK3S_INTERRUPT_HV_DECREMENTER blt hdec_soon 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 r5,HSTATE_KVM_VCORE(r13) ld r9,VCORE_KVM(r5) /* 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) #ifdef __BIG_ENDIAN__ lwz r8,PACA_LOCK_TOKEN(r13) #else lwz r8,PACAPACAINDEX(r13) #endif 24: lwarx r0,0,r3 cmpwi r0,0 bne 24b stwcx. r8,0,r3 bne 24b isync ld r5,HSTATE_KVM_VCORE(r13) ld r7,VCORE_LPCR(r5) /* use vcore->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 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 31: /* Do we have a guest vcpu to run? */ cmpdi r4, 0 beq kvmppc_primary_no_guest kvmppc_got_guest: /* Load up guest SLB entries */ 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: /* Increment yield count if they have a VPA */ ld r3, VCPU_VPA(r4) cmpdi r3, 0 beq 25f li r6, LPPACA_YIELDCOUNT LWZX_BE r5, r3, r6 addi r5, r5, 1 STWX_BE r5, r3, r6 li r6, 1 stb r6, VCPU_VPA_DIRTY(r4) 25: BEGIN_FTR_SECTION /* 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 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) BEGIN_FTR_SECTION /* Set partition DABR */ /* Do this before re-enabling PMU to avoid P7 DABR corruption bug */ lwz r5,VCPU_DABRX(r4) ld r6,VCPU_DABR(r4) mtspr SPRN_DABRX,r5 mtspr SPRN_DABR,r6 BEGIN_FTR_SECTION_NESTED(89) isync END_FTR_SECTION_NESTED(CPU_FTR_ARCH_206, CPU_FTR_ARCH_206, 89) END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) #ifdef CONFIG_PPC_TRANSACTIONAL_MEM BEGIN_FTR_SECTION b skip_tm END_FTR_SECTION_IFCLR(CPU_FTR_TM) /* Turn on TM/FP/VSX/VMX so we can restore them. */ mfmsr r5 li r6, MSR_TM >> 32 sldi r6, r6, 32 or r5, r5, r6 ori r5, r5, MSR_FP oris r5, r5, (MSR_VEC | MSR_VSX)@h mtmsrd r5 /* * The user may change these outside of a transaction, so they must * always be context switched. */ ld r5, VCPU_TFHAR(r4) ld r6, VCPU_TFIAR(r4) ld r7, VCPU_TEXASR(r4) mtspr SPRN_TFHAR, r5 mtspr SPRN_TFIAR, r6 mtspr SPRN_TEXASR, r7 ld r5, VCPU_MSR(r4) rldicl. r5, r5, 64 - MSR_TS_S_LG, 62 beq skip_tm /* TM not active in guest */ /* Make sure the failure summary is set, otherwise we'll program check * when we trechkpt. It's possible that this might have been not set * on a kvmppc_set_one_reg() call but we shouldn't let this crash the * host. */ oris r7, r7, (TEXASR_FS)@h mtspr SPRN_TEXASR, r7 /* * We need to load up the checkpointed state for the guest. * We need to do this early as it will blow away any GPRs, VSRs and * some SPRs. */ mr r31, r4 addi r3, r31, VCPU_FPRS_TM bl load_fp_state addi r3, r31, VCPU_VRS_TM bl load_vr_state mr r4, r31 lwz r7, VCPU_VRSAVE_TM(r4) mtspr SPRN_VRSAVE, r7 ld r5, VCPU_LR_TM(r4) lwz r6, VCPU_CR_TM(r4) ld r7, VCPU_CTR_TM(r4) ld r8, VCPU_AMR_TM(r4) ld r9, VCPU_TAR_TM(r4) mtlr r5 mtcr r6 mtctr r7 mtspr SPRN_AMR, r8 mtspr SPRN_TAR, r9 /* * Load up PPR and DSCR values but don't put them in the actual SPRs * till the last moment to avoid running with userspace PPR and DSCR for * too long. */ ld r29, VCPU_DSCR_TM(r4) ld r30, VCPU_PPR_TM(r4) std r2, PACATMSCRATCH(r13) /* Save TOC */ /* Clear the MSR RI since r1, r13 are all going to be foobar. */ li r5, 0 mtmsrd r5, 1 /* Load GPRs r0-r28 */ reg = 0 .rept 29 ld reg, VCPU_GPRS_TM(reg)(r31) reg = reg + 1 .endr mtspr SPRN_DSCR, r29 mtspr SPRN_PPR, r30 /* Load final GPRs */ ld 29, VCPU_GPRS_TM(29)(r31) ld 30, VCPU_GPRS_TM(30)(r31) ld 31, VCPU_GPRS_TM(31)(r31) /* TM checkpointed state is now setup. All GPRs are now volatile. */ TRECHKPT /* Now let's get back the state we need. */ HMT_MEDIUM GET_PACA(r13) ld r29, HSTATE_DSCR(r13) mtspr SPRN_DSCR, r29 ld r4, HSTATE_KVM_VCPU(r13) ld r1, HSTATE_HOST_R1(r13) ld r2, PACATMSCRATCH(r13) /* Set the MSR RI since we have our registers back. */ li r5, MSR_RI mtmsrd r5, 1 skip_tm: #endif /* 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 BEGIN_FTR_SECTION ld r3, VCPU_MMCR(r4) andi. r5, r3, MMCR0_PMAO_SYNC | MMCR0_PMAO cmpwi r5, MMCR0_PMAO beql kvmppc_fix_pmao END_FTR_SECTION_IFSET(CPU_FTR_PMAO_BUG) 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) ld r7, VCPU_SIAR(r4) ld r8, VCPU_SDAR(r4) mtspr SPRN_MMCR1, r5 mtspr SPRN_MMCRA, r6 mtspr SPRN_SIAR, r7 mtspr SPRN_SDAR, r8 BEGIN_FTR_SECTION ld r5, VCPU_MMCR + 24(r4) ld r6, VCPU_SIER(r4) lwz r7, VCPU_PMC + 24(r4) lwz r8, VCPU_PMC + 28(r4) ld r9, VCPU_MMCR + 32(r4) mtspr SPRN_MMCR2, r5 mtspr SPRN_SIER, r6 mtspr SPRN_SPMC1, r7 mtspr SPRN_SPMC2, r8 mtspr SPRN_MMCRS, r9 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) 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) BEGIN_FTR_SECTION /* Skip next section on POWER7 or PPC970 */ b 8f END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) /* Turn on TM so we can access TFHAR/TFIAR/TEXASR */ mfmsr r8 li r0, 1 rldimi r8, r0, MSR_TM_LG, 63-MSR_TM_LG mtmsrd r8 /* Load up POWER8-specific registers */ ld r5, VCPU_IAMR(r4) lwz r6, VCPU_PSPB(r4) ld r7, VCPU_FSCR(r4) mtspr SPRN_IAMR, r5 mtspr SPRN_PSPB, r6 mtspr SPRN_FSCR, r7 ld r5, VCPU_DAWR(r4) ld r6, VCPU_DAWRX(r4) ld r7, VCPU_CIABR(r4) ld r8, VCPU_TAR(r4) mtspr SPRN_DAWR, r5 mtspr SPRN_DAWRX, r6 mtspr SPRN_CIABR, r7 mtspr SPRN_TAR, r8 ld r5, VCPU_IC(r4) ld r6, VCPU_VTB(r4) mtspr SPRN_IC, r5 mtspr SPRN_VTB, r6 ld r8, VCPU_EBBHR(r4) mtspr SPRN_EBBHR, r8 ld r5, VCPU_EBBRR(r4) ld r6, VCPU_BESCR(r4) ld r7, VCPU_CSIGR(r4) ld r8, VCPU_TACR(r4) mtspr SPRN_EBBRR, r5 mtspr SPRN_BESCR, r6 mtspr SPRN_CSIGR, r7 mtspr SPRN_TACR, r8 ld r5, VCPU_TCSCR(r4) ld r6, VCPU_ACOP(r4) lwz r7, VCPU_GUEST_PID(r4) ld r8, VCPU_WORT(r4) mtspr SPRN_TCSCR, r5 mtspr SPRN_ACOP, r6 mtspr SPRN_PID, r7 mtspr SPRN_WORT, r8 8: /* * Set the decrementer to the guest decrementer. */ ld r8,VCPU_DEC_EXPIRES(r4) /* r8 is a host timebase value here, convert to guest TB */ ld r5,HSTATE_KVM_VCORE(r13) ld r6,VCORE_TB_OFFSET(r5) add r8,r8,r6 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 /* 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) /* 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 r10, VCPU_PC(r4) ld r11, VCPU_MSR(r4) ld r6, VCPU_SRR0(r4) ld r7, VCPU_SRR1(r4) mtspr SPRN_SRR0, r6 mtspr SPRN_SRR1, r7 deliver_guest_interrupt: /* 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) rldicl r0, r0, 64 - BOOK3S_IRQPRIO_EXTERNAL_LEVEL, 63 cmpdi cr1, r0, 0 andi. r8, r11, MSR_EE BEGIN_FTR_SECTION mfspr r8, SPRN_LPCR /* Insert EXTERNAL_LEVEL bit into LPCR at the MER bit position */ rldimi r8, r0, LPCR_MER_SH, 63 - LPCR_MER_SH mtspr SPRN_LPCR, r8 isync END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) beq 5f li r0, BOOK3S_INTERRUPT_EXTERNAL bne cr1, 12f mfspr r0, SPRN_DEC cmpwi r0, 0 li r0, BOOK3S_INTERRUPT_DECREMENTER bge 5f 12: mtspr SPRN_SRR0, r10 mr r10,r0 mtspr SPRN_SRR1, r11 mr r9, r4 bl kvmppc_msr_interrupt 5: /* * Required state: * R4 = vcpu * R10: value for HSRR0 * R11: value for HSRR1 * R13 = PACA */ fast_guest_return: li r0,0 stb r0,VCPU_CEDED(r4) /* cancel cede */ mtspr SPRN_HSRR0,r10 mtspr SPRN_HSRR1,r11 /* Activate guest mode, so faults get handled by KVM */ li r9, KVM_GUEST_MODE_GUEST_HV stb r9, HSTATE_IN_GUEST(r13) /* Enter guest */ BEGIN_FTR_SECTION ld r5, VCPU_CFAR(r4) mtspr SPRN_CFAR, r5 END_FTR_SECTION_IFSET(CPU_FTR_CFAR) BEGIN_FTR_SECTION ld r0, VCPU_PPR(r4) END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) ld r5, VCPU_LR(r4) lwz r6, VCPU_CR(r4) mtlr r5 mtcr r6 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) BEGIN_FTR_SECTION mtspr SPRN_PPR, r0 END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) ld r0, VCPU_GPR(R0)(r4) ld r4, VCPU_GPR(R4)(r4) hrfid b . /****************************************************************************** * * * Exit code * * * *****************************************************************************/ /* * We come here from the first-level interrupt handlers. */ .globl kvmppc_interrupt_hv kvmppc_interrupt_hv: /* * Register contents: * R12 = interrupt vector * R13 = PACA * guest CR, R12 saved in shadow VCPU SCRATCH1/0 * guest R13 saved in SPRN_SCRATCH0 */ std r9, HSTATE_SCRATCH2(r13) lbz r9, HSTATE_IN_GUEST(r13) cmpwi r9, KVM_GUEST_MODE_HOST_HV beq kvmppc_bad_host_intr #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE cmpwi r9, KVM_GUEST_MODE_GUEST ld r9, HSTATE_SCRATCH2(r13) beq kvmppc_interrupt_pr #endif /* We're now back in the host but in guest MMU context */ li r9, KVM_GUEST_MODE_HOST_HV stb r9, HSTATE_IN_GUEST(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_SCRATCH2(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) BEGIN_FTR_SECTION ld r3, HSTATE_CFAR(r13) std r3, VCPU_CFAR(r9) END_FTR_SECTION_IFSET(CPU_FTR_CFAR) BEGIN_FTR_SECTION ld r4, HSTATE_PPR(r13) std r4, VCPU_PPR(r9) END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) /* 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) 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 /* Only handle external interrupts here on arch 206 and later */ BEGIN_FTR_SECTION b ext_interrupt_to_host END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_206) /* External interrupt ? */ cmpwi r12, BOOK3S_INTERRUPT_EXTERNAL bne+ ext_interrupt_to_host /* External interrupt, first check for host_ipi. If this is * set, we know the host wants us out so let's do it now */ bl kvmppc_read_intr cmpdi r3, 0 bgt ext_interrupt_to_host /* Check if any CPU is heading out to the host, if so head out too */ ld r5, HSTATE_KVM_VCORE(r13) lwz r0, VCORE_ENTRY_EXIT(r5) cmpwi r0, 0x100 bge ext_interrupt_to_host /* Return to guest after delivering any pending interrupt */ mr r4, r9 b deliver_guest_interrupt ext_interrupt_to_host: guest_exit_cont: /* r9 = vcpu, r12 = trap, r13 = paca */ /* 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) /* Save DEC */ mfspr r5,SPRN_DEC mftb r6 extsw r5,r5 add r5,r5,r6 /* r5 is a guest timebase value here, convert to host TB */ ld r3,HSTATE_KVM_VCORE(r13) ld r4,VCORE_TB_OFFSET(r3) subf r5,r4,r5 std r5,VCPU_DEC_EXPIRES(r9) BEGIN_FTR_SECTION b 8f END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) /* Save POWER8-specific registers */ mfspr r5, SPRN_IAMR mfspr r6, SPRN_PSPB mfspr r7, SPRN_FSCR std r5, VCPU_IAMR(r9) stw r6, VCPU_PSPB(r9) std r7, VCPU_FSCR(r9) mfspr r5, SPRN_IC mfspr r6, SPRN_VTB mfspr r7, SPRN_TAR std r5, VCPU_IC(r9) std r6, VCPU_VTB(r9) std r7, VCPU_TAR(r9) mfspr r8, SPRN_EBBHR std r8, VCPU_EBBHR(r9) mfspr r5, SPRN_EBBRR mfspr r6, SPRN_BESCR mfspr r7, SPRN_CSIGR mfspr r8, SPRN_TACR std r5, VCPU_EBBRR(r9) std r6, VCPU_BESCR(r9) std r7, VCPU_CSIGR(r9) std r8, VCPU_TACR(r9) mfspr r5, SPRN_TCSCR mfspr r6, SPRN_ACOP mfspr r7, SPRN_PID mfspr r8, SPRN_WORT std r5, VCPU_TCSCR(r9) std r6, VCPU_ACOP(r9) stw r7, VCPU_GUEST_PID(r9) std r8, VCPU_WORT(r9) 8: /* 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(r9) 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 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM BEGIN_FTR_SECTION b 2f END_FTR_SECTION_IFCLR(CPU_FTR_TM) /* Turn on TM. */ mfmsr r8 li r0, 1 rldimi r8, r0, MSR_TM_LG, 63-MSR_TM_LG mtmsrd r8 ld r5, VCPU_MSR(r9) rldicl. r5, r5, 64 - MSR_TS_S_LG, 62 beq 1f /* TM not active in guest. */ li r3, TM_CAUSE_KVM_RESCHED /* Clear the MSR RI since r1, r13 are all going to be foobar. */ li r5, 0 mtmsrd r5, 1 /* All GPRs are volatile at this point. */ TRECLAIM(R3) /* Temporarily store r13 and r9 so we have some regs to play with */ SET_SCRATCH0(r13) GET_PACA(r13) std r9, PACATMSCRATCH(r13) ld r9, HSTATE_KVM_VCPU(r13) /* Get a few more GPRs free. */ std r29, VCPU_GPRS_TM(29)(r9) std r30, VCPU_GPRS_TM(30)(r9) std r31, VCPU_GPRS_TM(31)(r9) /* Save away PPR and DSCR soon so don't run with user values. */ mfspr r31, SPRN_PPR HMT_MEDIUM mfspr r30, SPRN_DSCR ld r29, HSTATE_DSCR(r13) mtspr SPRN_DSCR, r29 /* Save all but r9, r13 & r29-r31 */ reg = 0 .rept 29 .if (reg != 9) && (reg != 13) std reg, VCPU_GPRS_TM(reg)(r9) .endif reg = reg + 1 .endr /* ... now save r13 */ GET_SCRATCH0(r4) std r4, VCPU_GPRS_TM(13)(r9) /* ... and save r9 */ ld r4, PACATMSCRATCH(r13) std r4, VCPU_GPRS_TM(9)(r9) /* Reload stack pointer and TOC. */ ld r1, HSTATE_HOST_R1(r13) ld r2, PACATOC(r13) /* Set MSR RI now we have r1 and r13 back. */ li r5, MSR_RI mtmsrd r5, 1 /* Save away checkpinted SPRs. */ std r31, VCPU_PPR_TM(r9) std r30, VCPU_DSCR_TM(r9) mflr r5 mfcr r6 mfctr r7 mfspr r8, SPRN_AMR mfspr r10, SPRN_TAR std r5, VCPU_LR_TM(r9) stw r6, VCPU_CR_TM(r9) std r7, VCPU_CTR_TM(r9) std r8, VCPU_AMR_TM(r9) std r10, VCPU_TAR_TM(r9) /* Restore r12 as trap number. */ lwz r12, VCPU_TRAP(r9) /* Save FP/VSX. */ addi r3, r9, VCPU_FPRS_TM bl store_fp_state addi r3, r9, VCPU_VRS_TM bl store_vr_state mfspr r6, SPRN_VRSAVE stw r6, VCPU_VRSAVE_TM(r9) 1: /* * We need to save these SPRs after the treclaim so that the software * error code is recorded correctly in the TEXASR. Also the user may * change these outside of a transaction, so they must always be * context switched. */ mfspr r5, SPRN_TFHAR mfspr r6, SPRN_TFIAR mfspr r7, SPRN_TEXASR std r5, VCPU_TFHAR(r9) std r6, VCPU_TFIAR(r9) std r7, VCPU_TEXASR(r9) 2: #endif /* Increment yield count if they have a VPA */ ld r8, VCPU_VPA(r9) /* do they have a VPA? */ cmpdi r8, 0 beq 25f li r4, LPPACA_YIELDCOUNT LWZX_BE r3, r8, r4 addi r3, r3, 1 STWX_BE r3, r8, r4 li r3, 1 stb r3, VCPU_VPA_DIRTY(r9) 25: /* Save PMU registers if requested */ /* r8 and cr0.eq are live here */ BEGIN_FTR_SECTION /* * POWER8 seems to have a hardware bug where setting * MMCR0[PMAE] along with MMCR0[PMC1CE] and/or MMCR0[PMCjCE] * when some counters are already negative doesn't seem * to cause a performance monitor alert (and hence interrupt). * The effect of this is that when saving the PMU state, * if there is no PMU alert pending when we read MMCR0 * before freezing the counters, but one becomes pending * before we read the counters, we lose it. * To work around this, we need a way to freeze the counters * before reading MMCR0. Normally, freezing the counters * is done by writing MMCR0 (to set MMCR0[FC]) which * unavoidably writes MMCR0[PMA0] as well. On POWER8, * we can also freeze the counters using MMCR2, by writing * 1s to all the counter freeze condition bits (there are * 9 bits each for 6 counters). */ li r3, -1 /* set all freeze bits */ clrrdi r3, r3, 10 mfspr r10, SPRN_MMCR2 mtspr SPRN_MMCR2, r3 isync END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) 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 mfspr r7, SPRN_SIAR mfspr r8, SPRN_SDAR std r4, VCPU_MMCR(r9) std r5, VCPU_MMCR + 8(r9) std r6, VCPU_MMCR + 16(r9) BEGIN_FTR_SECTION std r10, VCPU_MMCR + 24(r9) END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) std r7, VCPU_SIAR(r9) std r8, VCPU_SDAR(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) BEGIN_FTR_SECTION mfspr r5, SPRN_SIER mfspr r6, SPRN_SPMC1 mfspr r7, SPRN_SPMC2 mfspr r8, SPRN_MMCRS std r5, VCPU_SIER(r9) stw r6, VCPU_PMC + 24(r9) stw r7, VCPU_PMC + 28(r9) std r8, VCPU_MMCR + 32(r9) lis r4, 0x8000 mtspr SPRN_MMCRS, r4 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) 22: /* Clear out SLB */ li r5,0 slbmte r5,r5 slbia ptesync hdec_soon: /* 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 */ 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 isync /* order stwcx. vs. reading napping_threads */ /* * 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 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) lbz r4,HSTATE_PTID(r13) li r0,1 sld r0,r0,r4 andc. r3,r3,r0 /* no sense IPI'ing ourselves */ beq 43f /* Order entry/exit update vs. IPIs */ sync 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_MFRR stbcix r0,r7,r8 /* trigger the IPI */ 44: srdi. r3,r3,1 addi r6,r6,PACA_SIZE bne 42b secondary_too_late: /* Secondary threads wait for primary to do partition switch */ 43: ld r5,HSTATE_KVM_VCORE(r13) ld r4,VCORE_KVM(r5) /* pointer to struct kvm */ lbz r3,HSTATE_PTID(r13) 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 BEGIN_FTR_SECTION /* DPDES is shared between threads */ mfspr r7, SPRN_DPDES std r7, VCORE_DPDES(r5) /* clear DPDES so we don't get guest doorbells in the host */ li r8, 0 mtspr SPRN_DPDES, r8 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) /* Subtract timebase offset from timebase */ ld r8,VCORE_TB_OFFSET(r5) cmpdi r8,0 beq 17f mftb r6 /* current guest timebase */ subf r8,r8,r6 mtspr SPRN_TBU40,r8 /* update upper 40 bits */ mftb r7 /* check if lower 24 bits overflowed */ clrldi r6,r6,40 clrldi r7,r7,40 cmpld r7,r6 bge 17f addis r8,r8,0x100 /* if so, increment upper 40 bits */ mtspr SPRN_TBU40,r8 /* Reset PCR */ 17: ld r0, VCORE_PCR(r5) cmpdi r0, 0 beq 18f li r0, 0 mtspr SPRN_PCR, r0 18: /* Signal secondary CPUs to continue */ 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 r5,HSTATE_KVM_VCORE(r13) ld r4,VCORE_KVM(r5) /* pointer to struct kvm */ /* Take the guest's tlbie_lock */ #ifdef __BIG_ENDIAN__ lwz r8,PACA_LOCK_TOKEN(r13) #else lwz r8,PACAPACAINDEX(r13) #endif 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 li r3, SLBSHADOW_SAVEAREA LDX_BE r5, r8, r3 addi r3, r3, 8 LDX_BE r6, r8, r3 andis. r7,r5,SLB_ESID_V@h beq 1f slbmte r6,r5 1: addi r8,r8,16 .endr /* Unset guest mode */ li r0, KVM_GUEST_MODE_NONE stb r0, HSTATE_IN_GUEST(r13) ld r0, 112+PPC_LR_STKOFF(r1) addi r1, r1, 112 mtlr r0 blr /* * 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 bl kvmppc_msr_interrupt 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_HOST_HV 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 bl kvmppc_msr_interrupt 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 /* sc 1 from userspace - reflect to guest syscall */ bne sc_1_fast_return clrrdi r3,r3,2 cmpldi r3,hcall_real_table_end - hcall_real_table bge guest_exit_cont /* See if this hcall is enabled for in-kernel handling */ ld r4, VCPU_KVM(r9) srdi r0, r3, 8 /* r0 = (r3 / 4) >> 6 */ sldi r0, r0, 3 /* index into kvm->arch.enabled_hcalls[] */ add r4, r4, r0 ld r0, KVM_ENABLED_HCALLS(r4) rlwinm r4, r3, 32-2, 0x3f /* r4 = (r3 / 4) & 0x3f */ srd r0, r0, r4 andi. r0, r0, 1 beq guest_exit_cont /* Get pointer to handler, if any, and call it */ LOAD_REG_ADDR(r4, hcall_real_table) lwax r3,r3,r4 cmpwi r3,0 beq guest_exit_cont add r12,r3,r4 mtctr r12 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 sc_1_fast_return: mtspr SPRN_SRR0,r10 mtspr SPRN_SRR1,r11 li r10, BOOK3S_INTERRUPT_SYSCALL bl kvmppc_msr_interrupt mr r4,r9 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 DOTSYM(kvmppc_h_remove) - hcall_real_table .long DOTSYM(kvmppc_h_enter) - hcall_real_table .long DOTSYM(kvmppc_h_read) - hcall_real_table .long 0 /* 0x10 - H_CLEAR_MOD */ .long 0 /* 0x14 - H_CLEAR_REF */ .long DOTSYM(kvmppc_h_protect) - hcall_real_table .long DOTSYM(kvmppc_h_get_tce) - hcall_real_table .long DOTSYM(kvmppc_h_put_tce) - hcall_real_table .long 0 /* 0x24 - H_SET_SPRG0 */ .long DOTSYM(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 */ #ifdef CONFIG_KVM_XICS .long DOTSYM(kvmppc_rm_h_eoi) - hcall_real_table .long DOTSYM(kvmppc_rm_h_cppr) - hcall_real_table .long DOTSYM(kvmppc_rm_h_ipi) - hcall_real_table .long 0 /* 0x70 - H_IPOLL */ .long DOTSYM(kvmppc_rm_h_xirr) - hcall_real_table #else .long 0 /* 0x64 - H_EOI */ .long 0 /* 0x68 - H_CPPR */ .long 0 /* 0x6c - H_IPI */ .long 0 /* 0x70 - H_IPOLL */ .long 0 /* 0x74 - H_XIRR */ #endif .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 DOTSYM(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 DOTSYM(kvmppc_h_bulk_remove) - hcall_real_table .long 0 /* 0x128 */ .long 0 /* 0x12c */ .long 0 /* 0x130 */ .long DOTSYM(kvmppc_h_set_xdabr) - hcall_real_table .globl hcall_real_table_end hcall_real_table_end: ignore_hdec: mr r4,r9 b fast_guest_return _GLOBAL(kvmppc_h_set_xdabr) andi. r0, r5, DABRX_USER | DABRX_KERNEL beq 6f li r0, DABRX_USER | DABRX_KERNEL | DABRX_BTI andc. r0, r5, r0 beq 3f 6: li r3, H_PARAMETER blr _GLOBAL(kvmppc_h_set_dabr) li r5, DABRX_USER | DABRX_KERNEL 3: BEGIN_FTR_SECTION b 2f END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) std r4,VCPU_DABR(r3) stw r5, VCPU_DABRX(r3) mtspr SPRN_DABRX, r5 /* 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 /* Emulate H_SET_DABR/X on P8 for the sake of compat mode guests */ 2: rlwimi r5, r4, 5, DAWRX_DR | DAWRX_DW rlwimi r5, r4, 1, DAWRX_WT clrrdi r4, r4, 3 std r4, VCPU_DAWR(r3) std r5, VCPU_DAWRX(r3) mtspr SPRN_DAWR, r4 mtspr SPRN_DAWRX, r5 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) lbz r6,HSTATE_PTID(r13) 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 /* order napping_threads update vs testing entry_exit_count */ isync li r0,NAPPING_CEDE stb r0,HSTATE_NAPPING(r13) 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 or doobell interrupt * occurs, with PECE1, PECE0 and PECEDP set in LPCR. Also clear the * runlatch bit before napping. */ mfspr r2, SPRN_CTRLF clrrdi r2, r2, 1 mtspr SPRN_CTRLT, r2 li r0,1 stb r0,HSTATE_HWTHREAD_REQ(r13) mfspr r5,SPRN_LPCR ori r5,r5,LPCR_PECE0 | LPCR_PECE1 BEGIN_FTR_SECTION oris r5,r5,LPCR_PECEDP@h END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) 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 . 33: mr r4, r3 li r3, 0 li r12, 0 b 34f kvm_end_cede: /* get vcpu pointer */ ld r4, HSTATE_KVM_VCPU(r13) /* 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) /* Check the wake reason in SRR1 to see why we got here */ bl kvmppc_check_wake_reason /* clear our bit in vcore->napping_threads */ 34: ld r5,HSTATE_KVM_VCORE(r13) lbz r7,HSTATE_PTID(r13) li r0,1 sld r0,r0,r7 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 the wake reason means we need to exit */ stw r12, VCPU_TRAP(r4) mr r9, r4 cmpdi r3, 0 bgt guest_exit_cont /* see if any other thread is already exiting */ lwz r0,VCORE_ENTRY_EXIT(r5) cmpwi r0,0x100 bge guest_exit_cont b kvmppc_cede_reentry /* if not go back to guest */ /* 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: b hcall_real_fallback /* 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 /* Did we handle MCE ? */ ld r9, HSTATE_KVM_VCPU(r13) li r12, BOOK3S_INTERRUPT_MACHINE_CHECK /* * Deliver unhandled/fatal (e.g. UE) MCE errors to guest through * machine check interrupt (set HSRR0 to 0x200). And for handled * errors (no-fatal), just go back to guest execution with current * HSRR0 instead of exiting guest. This new approach will inject * machine check to guest for fatal error causing guest to crash. * * The old code used to return to host for unhandled errors which * was causing guest to hang with soft lockups inside guest and * makes it difficult to recover guest instance. */ ld r10, VCPU_PC(r9) ld r11, VCPU_MSR(r9) bne 2f /* Continue guest execution. */ /* If not, deliver a machine check. SRR0/1 are already set */ li r10, BOOK3S_INTERRUPT_MACHINE_CHECK ld r11, VCPU_MSR(r9) bl kvmppc_msr_interrupt 2: b fast_interrupt_c_return /* * Check the reason we woke from nap, and take appropriate action. * Returns: * 0 if nothing needs to be done * 1 if something happened that needs to be handled by the host * -1 if there was a guest wakeup (IPI) * * Also sets r12 to the interrupt vector for any interrupt that needs * to be handled now by the host (0x500 for external interrupt), or zero. */ kvmppc_check_wake_reason: mfspr r6, SPRN_SRR1 BEGIN_FTR_SECTION rlwinm r6, r6, 45-31, 0xf /* extract wake reason field (P8) */ FTR_SECTION_ELSE rlwinm r6, r6, 45-31, 0xe /* P7 wake reason field is 3 bits */ ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_207S) cmpwi r6, 8 /* was it an external interrupt? */ li r12, BOOK3S_INTERRUPT_EXTERNAL beq kvmppc_read_intr /* if so, see what it was */ li r3, 0 li r12, 0 cmpwi r6, 6 /* was it the decrementer? */ beq 0f BEGIN_FTR_SECTION cmpwi r6, 5 /* privileged doorbell? */ beq 0f cmpwi r6, 3 /* hypervisor doorbell? */ beq 3f END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) li r3, 1 /* anything else, return 1 */ 0: blr /* hypervisor doorbell */ 3: li r12, BOOK3S_INTERRUPT_H_DOORBELL li r3, 1 blr /* * Determine what sort of external interrupt is pending (if any). * Returns: * 0 if no interrupt is pending * 1 if an interrupt is pending that needs to be handled by the host * -1 if there was a guest wakeup IPI (which has now been cleared) */ kvmppc_read_intr: /* see if a host IPI is pending */ li r3, 1 lbz r0, HSTATE_HOST_IPI(r13) cmpwi r0, 0 bne 1f /* Now read the interrupt from the ICP */ ld r6, HSTATE_XICS_PHYS(r13) li r7, XICS_XIRR cmpdi r6, 0 beq- 1f lwzcix r0, r6, r7 /* * Save XIRR for later. Since we get in in reverse endian on LE * systems, save it byte reversed and fetch it back in host endian. */ li r3, HSTATE_SAVED_XIRR STWX_BE r0, r3, r13 #ifdef __LITTLE_ENDIAN__ lwz r3, HSTATE_SAVED_XIRR(r13) #else mr r3, r0 #endif rlwinm. r3, r3, 0, 0xffffff sync beq 1f /* if nothing pending in the ICP */ /* We found something in the ICP... * * If it's not an IPI, stash it in the PACA and return to * the host, we don't (yet) handle directing real external * interrupts directly to the guest */ cmpwi r3, XICS_IPI /* if there is, is it an IPI? */ bne 42f /* It's an IPI, clear the MFRR and EOI it */ li r3, 0xff li r8, XICS_MFRR stbcix r3, r6, r8 /* clear the IPI */ stwcix r0, r6, r7 /* EOI it */ sync /* We need to re-check host IPI now in case it got set in the * meantime. If it's clear, we bounce the interrupt to the * guest */ lbz r0, HSTATE_HOST_IPI(r13) cmpwi r0, 0 bne- 43f /* OK, it's an IPI for us */ li r3, -1 1: blr 42: /* It's not an IPI and it's for the host. We saved a copy of XIRR in * the PACA earlier, it will be picked up by the host ICP driver */ li r3, 1 b 1b 43: /* We raced with the host, we need to resend that IPI, bummer */ li r0, IPI_PRIORITY stbcix r0, r6, r8 /* set the IPI */ sync li r3, 1 b 1b /* * Save away FP, VMX and VSX registers. * r3 = vcpu pointer * N.B. r30 and r31 are volatile across this function, * thus it is not callable from C. */ kvmppc_save_fp: mflr r30 mr r31,r3 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 addi r3,r3,VCPU_FPRS bl store_fp_state #ifdef CONFIG_ALTIVEC BEGIN_FTR_SECTION addi r3,r31,VCPU_VRS bl store_vr_state END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) #endif mfspr r6,SPRN_VRSAVE stw r6,VCPU_VRSAVE(r31) mtlr r30 blr /* * Load up FP, VMX and VSX registers * r4 = vcpu pointer * N.B. r30 and r31 are volatile across this function, * thus it is not callable from C. */ kvmppc_load_fp: mflr r30 mr r31,r4 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 addi r3,r4,VCPU_FPRS bl load_fp_state #ifdef CONFIG_ALTIVEC BEGIN_FTR_SECTION addi r3,r31,VCPU_VRS bl load_vr_state END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) #endif lwz r7,VCPU_VRSAVE(r31) mtspr SPRN_VRSAVE,r7 mtlr r30 mr r4,r31 blr /* * We come here if we get any exception or interrupt while we are * executing host real mode code while in guest MMU context. * For now just spin, but we should do something better. */ kvmppc_bad_host_intr: b . /* * This mimics the MSR transition on IRQ delivery. The new guest MSR is taken * from VCPU_INTR_MSR and is modified based on the required TM state changes. * r11 has the guest MSR value (in/out) * r9 has a vcpu pointer (in) * r0 is used as a scratch register */ kvmppc_msr_interrupt: rldicl r0, r11, 64 - MSR_TS_S_LG, 62 cmpwi r0, 2 /* Check if we are in transactional state.. */ ld r11, VCPU_INTR_MSR(r9) bne 1f /* ... if transactional, change to suspended */ li r0, 1 1: rldimi r11, r0, MSR_TS_S_LG, 63 - MSR_TS_T_LG blr /* * This works around a hardware bug on POWER8E processors, where * writing a 1 to the MMCR0[PMAO] bit doesn't generate a * performance monitor interrupt. Instead, when we need to have * an interrupt pending, we have to arrange for a counter to overflow. */ kvmppc_fix_pmao: li r3, 0 mtspr SPRN_MMCR2, r3 lis r3, (MMCR0_PMXE | MMCR0_FCECE)@h ori r3, r3, MMCR0_PMCjCE | MMCR0_C56RUN mtspr SPRN_MMCR0, r3 lis r3, 0x7fff ori r3, r3, 0xffff mtspr SPRN_PMC6, r3 isync blr