diff options
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv_rmhandlers.S | 212 |
1 files changed, 126 insertions, 86 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index 245f5c972030..3f6fd78cccd2 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -175,6 +175,19 @@ kvmppc_primary_no_guest: /* put the HDEC into the DEC, since HDEC interrupts don't wake us */ mfspr r3, SPRN_HDEC mtspr SPRN_DEC, r3 + /* + * Make sure the primary has finished the MMU switch. + * We should never get here on a secondary thread, but + * check it for robustness' sake. + */ + ld r5, HSTATE_KVM_VCORE(r13) +65: lbz r0, VCORE_IN_GUEST(r5) + cmpwi r0, 0 + beq 65b + /* Set LPCR. */ + ld r8,VCORE_LPCR(r5) + mtspr SPRN_LPCR,r8 + isync /* set our bit in napping_threads */ ld r5, HSTATE_KVM_VCORE(r13) lbz r7, HSTATE_PTID(r13) @@ -206,7 +219,7 @@ kvm_novcpu_wakeup: /* 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 @@ -244,7 +257,15 @@ kvm_novcpu_wakeup: b kvmppc_got_guest kvm_novcpu_exit: - b hdec_soon +#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING + ld r4, HSTATE_KVM_VCPU(r13) + cmpdi r4, 0 + beq 13f + addi r3, r4, VCPU_TB_RMEXIT + bl kvmhv_accumulate_time +#endif +13: bl kvmhv_commence_exit + b kvmhv_switch_to_host /* * We come in here when wakened from nap mode. @@ -422,7 +443,7 @@ kvmppc_hv_entry: /* Primary thread switches to guest partition. */ ld r9,VCORE_KVM(r5) /* pointer to struct kvm */ cmpwi r6,0 - bne 20f + bne 10f ld r6,KVM_SDR1(r9) lwz r7,KVM_LPID(r9) li r0,LPID_RSVD /* switch to reserved LPID */ @@ -493,26 +514,9 @@ 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. */ -10: ld r8,VCORE_LPCR(r5) - mtspr SPRN_LPCR,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 /* Do we have a guest vcpu to run? */ - cmpdi r4, 0 +10: cmpdi r4, 0 beq kvmppc_primary_no_guest kvmppc_got_guest: @@ -837,6 +841,30 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) clrrdi r6,r6,1 mtspr SPRN_CTRLT,r6 4: + /* Secondary threads wait for primary to have done partition switch */ + ld r5, HSTATE_KVM_VCORE(r13) + lbz r6, HSTATE_PTID(r13) + cmpwi r6, 0 + beq 21f + lbz r0, VCORE_IN_GUEST(r5) + cmpwi r0, 0 + bne 21f + HMT_LOW +20: lbz r0, VCORE_IN_GUEST(r5) + cmpwi r0, 0 + beq 20b + HMT_MEDIUM +21: + /* Set LPCR. */ + ld r8,VCORE_LPCR(r5) + mtspr SPRN_LPCR,r8 + isync + + /* Check if HDEC expires soon */ + mfspr r3, SPRN_HDEC + cmpwi r3, 512 /* 1 microsecond */ + blt hdec_soon + ld r6, VCPU_CTR(r4) lwz r7, VCPU_XER(r4) @@ -942,22 +970,26 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) hrfid b . -#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING secondary_too_late: + li r12, 0 cmpdi r4, 0 beq 11f + stw r12, VCPU_TRAP(r4) +#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING addi r3, r4, VCPU_TB_RMEXIT bl kvmhv_accumulate_time +#endif 11: b kvmhv_switch_to_host hdec_soon: - ld r4, HSTATE_KVM_VCPU(r13) - cmpdi r4, 0 - beq 12f + li r12, BOOK3S_INTERRUPT_HV_DECREMENTER + stw r12, VCPU_TRAP(r4) + mr r9, r4 +#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING addi r3, r4, VCPU_TB_RMEXIT bl kvmhv_accumulate_time -12: b kvmhv_do_exit #endif + b guest_exit_cont /****************************************************************************** * * @@ -1113,7 +1145,7 @@ guest_exit_cont: /* r9 = vcpu, r12 = trap, r13 = paca */ stw r7, VCPU_DSISR(r9) /* don't overwrite fault_dar/fault_dsisr if HDSI */ cmpwi r12,BOOK3S_INTERRUPT_H_DATA_STORAGE - beq 6f + beq mc_cont std r6, VCPU_FAULT_DAR(r9) stw r7, VCPU_FAULT_DSISR(r9) @@ -1127,8 +1159,11 @@ mc_cont: bl kvmhv_accumulate_time #endif + /* Increment exit count, poke other threads to exit */ + bl kvmhv_commence_exit + /* Save guest CTRL register, set runlatch to 1 */ -6: mfspr r6,SPRN_CTRLF + mfspr r6,SPRN_CTRLF stw r6,VCPU_CTRL(r9) andi. r0,r6,1 bne 4f @@ -1470,68 +1505,14 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) slbia ptesync -#ifndef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING -hdec_soon: -#endif -kvmhv_do_exit: /* r12 = trap, r13 = paca */ /* * POWER7/POWER8 guest -> host partition switch code. * We don't have to lock against tlbies but we do * have to coordinate the hardware threads. */ - /* Set our bit in the threads-exiting-guest map in the 0xff00 - bits of vcore->entry_exit_map */ - ld r5, HSTATE_KVM_VCORE(r13) - lbz r4, HSTATE_PTID(r13) - li r7, 0x100 - sld r7, r7, r4 - addi r6, r5, VCORE_ENTRY_EXIT -41: lwarx r3, 0, r6 - or r0, r3, r7 - 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 send a message or - * IPI to all the threads that have their bit set in the entry - * map in vcore->entry_exit_map (other than ourselves). - * 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 43f - - srwi r0,r7,8 - 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 - -#ifndef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING -secondary_too_late: -#endif kvmhv_switch_to_host: /* Secondary threads wait for primary to do partition switch */ -43: ld r5,HSTATE_KVM_VCORE(r13) + ld r5,HSTATE_KVM_VCORE(r13) ld r4,VCORE_KVM(r5) /* pointer to struct kvm */ lbz r3,HSTATE_PTID(r13) cmpwi r3,0 @@ -1633,6 +1614,63 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) mtlr r0 blr +kvmhv_commence_exit: /* r12 = trap, r13 = paca, doesn't trash r9 */ + mflr r0 + std r0, PPC_LR_STKOFF(r1) + stdu r1, -PPC_MIN_STKFRM(r1) + + /* Set our bit in the threads-exiting-guest map in the 0xff00 + bits of vcore->entry_exit_map */ + ld r5, HSTATE_KVM_VCORE(r13) + lbz r4, HSTATE_PTID(r13) + li r7, 0x100 + sld r7, r7, r4 + addi r6, r5, VCORE_ENTRY_EXIT +41: lwarx r3, 0, r6 + or r0, r3, r7 + 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 send a message or + * IPI to all the threads that have their bit set in the entry + * map in vcore->entry_exit_map (other than ourselves). + * 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 43f + + srwi r0,r7,8 + 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 + +43: ld r0, PPC_MIN_STKFRM+PPC_LR_STKOFF(r1) + addi r1, r1, PPC_MIN_STKFRM + 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 @@ -2068,8 +2106,8 @@ _GLOBAL(kvmppc_h_cede) /* r3 = vcpu pointer, r11 = msr, r13 = paca */ 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 r12,0 /* set trap to 0 to say hcall is handled */ + stw r12,VCPU_TRAP(r3) li r0,H_SUCCESS std r0,VCPU_GPR(R3)(r3) @@ -2275,7 +2313,8 @@ kvm_cede_prodded: /* we've ceded but we want to give control to the host */ kvm_cede_exit: - b hcall_real_fallback + ld r9, HSTATE_KVM_VCPU(r13) + b guest_exit_cont /* Try to handle a machine check in real mode */ machine_check_realmode: @@ -2405,6 +2444,7 @@ kvmppc_read_intr: bne- 43f /* OK, it's an IPI for us */ + li r12, 0 li r3, -1 1: blr |