[v2,04/33] KVM: PPC: Book3S HV: Extract PMU save/restore operations as C-callable functions

Message ID	1538127963-15645-5-git-send-email-paulus@ozlabs.org (mailing list archive)
State	New, archived
Headers	show Return-Path: <kvm-owner@kernel.org> From: Paul Mackerras <paulus@ozlabs.org> To: kvm@vger.kernel.org, kvm-ppc@vger.kernel.org Cc: linuxppc-dev@ozlabs.org, David Gibson <david@gibson.dropbear.id.au> Subject: [PATCH v2 04/33] KVM: PPC: Book3S HV: Extract PMU save/restore operations as C-callable functions Date: Fri, 28 Sep 2018 19:45:34 +1000 Message-Id: <1538127963-15645-5-git-send-email-paulus@ozlabs.org> In-Reply-To: <1538127963-15645-1-git-send-email-paulus@ozlabs.org> References: <1538127963-15645-1-git-send-email-paulus@ozlabs.org> Sender: kvm-owner@vger.kernel.org Precedence: bulk
Series	KVM: PPC: Book3S HV: Nested HV virtualization \| expand [v2,00/33] KVM: PPC: Book3S HV: Nested HV virtualization [v2,01/33] KVM: PPC: Book3S: Simplify external interrupt handling [v2,02/33] KVM: PPC: Book3S HV: Remove left-over code in XICS-on-XIVE emulation [v2,03/33] KVM: PPC: Book3S HV: Move interrupt delivery on guest entry to C code [v2,04/33] KVM: PPC: Book3S HV: Extract PMU save/restore operations as C-callable functions [v2,05/33] KVM: PPC: Book3S HV: Simplify real-mode interrupt handling [v2,06/33] KVM: PPC: Book3S: Rework TM save/restore code and make it C-callable [v2,07/33] KVM: PPC: Book3S HV: Call kvmppc_handle_exit_hv() with vcore unlocked [v2,08/33] KVM: PPC: Book3S HV: Streamlined guest entry/exit path on P9 for radix guests [v2,09/33] KVM: PPC: Book3S HV: Handle hypervisor instruction faults better [v2,10/33] KVM: PPC: Book3S HV: Add a debugfs file to dump radix mappings [v2,11/33] powerpc: Add LPCR_EVIRT define [v2,12/33] powerpc: Turn off CPU_FTR_P9_TM_HV_ASSIST in non-hypervisor mode [v2,13/33] KVM: PPC: Use ccr field in pt_regs struct embedded in vcpu struct [v2,14/33] KVM: PPC: Book3S HV: Clear partition table entry on vm teardown [v2,15/33] KVM: PPC: Book3S HV: Make kvmppc_mmu_radix_xlate process/partition table agnostic [v2,16/33] KVM: PPC: Book3S HV: Refactor radix page fault handler [v2,17/33] KVM: PPC: Book3S HV: Use kvmppc_unmap_pte() in kvm_unmap_radix() [v2,18/33] KVM: PPC: Book3S HV: Framework and hcall stubs for nested virtualization [v2,19/33] KVM: PPC: Book3S HV: Nested guest entry via hypercall [v2,20/33] KVM: PPC: Book3S HV: Use XICS hypercalls when running as a nested hypervisor [v2,21/33] KVM: PPC: Book3S HV: Handle hypercalls correctly when nested [v2,22/33] KVM: PPC: Book3S HV: Framework to handle HV Emulation Assist Interrupt [v2,23/33] KVM: PPC: Book3S HV: Handle page fault for a nested guest [v2,24/33] KVM: PPC: Book3S HV: Introduce rmap to track nested guest mappings [v2,25/33] KVM: PPC: Book3S HV: Emulate Privileged TLBIE for guest hypervisors [v2,26/33] KVM: PPC: Book3S HV: Invalidate TLB when nested vcpu moves physical cpu [v2,27/33] KVM: PPC: Book3S HV: Don't access HFSCR, LPIDR or LPCR when running nested [v2,28/33] KVM: PPC: Book3S HV: Add one-reg interface to virtual PTCR register [v2,29/33] KVM: PPC: Book3S HV: Sanitise hv_regs on nested guest entry [v2,30/33] KVM: PPC: Book3S HV: Handle differing endianness for H_ENTER_NESTED [v2,31/33] KVM: PPC: Book3S HV: Allow HV module to load without hypervisor mode [v2,32/33] KVM: PPC: Book3S HV: Add nested shadow page tables to debugfs [v2,33/33] KVM: PPC: Book3S HV: Use hypercalls for TLB invalidation when nested

diff --git a/arch/powerpc/include/asm/asm-prototypes.h b/arch/powerpc/include/asm/asm-prototypes.h index 1f4691c..024e8fc 100644 --- a/arch/powerpc/include/asm/asm-prototypes.h +++ b/arch/powerpc/include/asm/asm-prototypes.h @@ -150,4 +150,9 @@ extern s32 patch__memset_nocache, patch__memcpy_nocache; extern long flush_count_cache; +void kvmhv_save_host_pmu(void); +void kvmhv_load_host_pmu(void); +void kvmhv_save_guest_pmu(struct kvm_vcpu *vcpu, bool pmu_in_use); +void kvmhv_load_guest_pmu(struct kvm_vcpu *vcpu); + #endif /* _ASM_POWERPC_ASM_PROTOTYPES_H */ diff --git a/arch/powerpc/kvm/book3s_hv_interrupts.S b/arch/powerpc/kvm/book3s_hv_interrupts.S index 666b91c..a6d1001 100644 --- a/arch/powerpc/kvm/book3s_hv_interrupts.S +++ b/arch/powerpc/kvm/book3s_hv_interrupts.S @@ -64,52 +64,7 @@ BEGIN_FTR_SECTION END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) /* Save host PMU registers */ -BEGIN_FTR_SECTION - /* Work around P8 PMAE bug */ - li r3, -1 - clrrdi r3, r3, 10 - mfspr r8, SPRN_MMCR2 - mtspr SPRN_MMCR2, r3 /* freeze all counters using MMCR2 */ - isync -END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) - li r3, 1 - sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */ - mfspr r7, SPRN_MMCR0 /* save MMCR0 */ - mtspr SPRN_MMCR0, r3 /* freeze all counters, disable interrupts */ - mfspr r6, SPRN_MMCRA - /* Clear MMCRA in order to disable SDAR updates */ - li r5, 0 - mtspr SPRN_MMCRA, r5 - isync - lbz r5, PACA_PMCINUSE(r13) /* is the host using the PMU? */ - cmpwi r5, 0 - beq 31f /* skip if not */ - mfspr r5, SPRN_MMCR1 - mfspr r9, SPRN_SIAR - mfspr r10, SPRN_SDAR - std r7, HSTATE_MMCR0(r13) - std r5, HSTATE_MMCR1(r13) - std r6, HSTATE_MMCRA(r13) - std r9, HSTATE_SIAR(r13) - std r10, HSTATE_SDAR(r13) -BEGIN_FTR_SECTION - mfspr r9, SPRN_SIER - std r8, HSTATE_MMCR2(r13) - std r9, HSTATE_SIER(r13) -END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) - mfspr r3, SPRN_PMC1 - mfspr r5, SPRN_PMC2 - mfspr r6, SPRN_PMC3 - mfspr r7, SPRN_PMC4 - mfspr r8, SPRN_PMC5 - mfspr r9, SPRN_PMC6 - stw r3, HSTATE_PMC1(r13) - stw r5, HSTATE_PMC2(r13) - stw r6, HSTATE_PMC3(r13) - stw r7, HSTATE_PMC4(r13) - stw r8, HSTATE_PMC5(r13) - stw r9, HSTATE_PMC6(r13) -31: + bl kvmhv_save_host_pmu /* * Put whatever is in the decrementer into the @@ -161,3 +116,51 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) ld r0, PPC_LR_STKOFF(r1) mtlr r0 blr + +_GLOBAL(kvmhv_save_host_pmu) +BEGIN_FTR_SECTION + /* Work around P8 PMAE bug */ + li r3, -1 + clrrdi r3, r3, 10 + mfspr r8, SPRN_MMCR2 + mtspr SPRN_MMCR2, r3 /* freeze all counters using MMCR2 */ + isync +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) + li r3, 1 + sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */ + mfspr r7, SPRN_MMCR0 /* save MMCR0 */ + mtspr SPRN_MMCR0, r3 /* freeze all counters, disable interrupts */ + mfspr r6, SPRN_MMCRA + /* Clear MMCRA in order to disable SDAR updates */ + li r5, 0 + mtspr SPRN_MMCRA, r5 + isync + lbz r5, PACA_PMCINUSE(r13) /* is the host using the PMU? */ + cmpwi r5, 0 + beq 31f /* skip if not */ + mfspr r5, SPRN_MMCR1 + mfspr r9, SPRN_SIAR + mfspr r10, SPRN_SDAR + std r7, HSTATE_MMCR0(r13) + std r5, HSTATE_MMCR1(r13) + std r6, HSTATE_MMCRA(r13) + std r9, HSTATE_SIAR(r13) + std r10, HSTATE_SDAR(r13) +BEGIN_FTR_SECTION + mfspr r9, SPRN_SIER + std r8, HSTATE_MMCR2(r13) + std r9, HSTATE_SIER(r13) +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) + mfspr r3, SPRN_PMC1 + mfspr r5, SPRN_PMC2 + mfspr r6, SPRN_PMC3 + mfspr r7, SPRN_PMC4 + mfspr r8, SPRN_PMC5 + mfspr r9, SPRN_PMC6 + stw r3, HSTATE_PMC1(r13) + stw r5, HSTATE_PMC2(r13) + stw r6, HSTATE_PMC3(r13) + stw r7, HSTATE_PMC4(r13) + stw r8, HSTATE_PMC5(r13) + stw r9, HSTATE_PMC6(r13) +31: blr diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index 6752da1..5b2ae34 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -28,6 +28,7 @@ #include <asm/exception-64s.h> #include <asm/kvm_book3s_asm.h> #include <asm/book3s/64/mmu-hash.h> +#include <asm/export.h> #include <asm/tm.h> #include <asm/opal.h> #include <asm/xive-regs.h> @@ -113,45 +114,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) mtspr SPRN_SPRG_VDSO_WRITE,r3 /* Reload the host's PMU registers */ - lbz r4, PACA_PMCINUSE(r13) /* is the host using the PMU? */ - cmpwi r4, 0 - beq 23f /* skip if not */ -BEGIN_FTR_SECTION - ld r3, HSTATE_MMCR0(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_PMC1(r13) - lwz r4, HSTATE_PMC2(r13) - lwz r5, HSTATE_PMC3(r13) - lwz r6, HSTATE_PMC4(r13) - lwz r8, HSTATE_PMC5(r13) - lwz r9, HSTATE_PMC6(r13) - mtspr SPRN_PMC1, r3 - mtspr SPRN_PMC2, r4 - mtspr SPRN_PMC3, r5 - mtspr SPRN_PMC4, r6 - mtspr SPRN_PMC5, r8 - mtspr SPRN_PMC6, r9 - ld r3, HSTATE_MMCR0(r13) - ld r4, HSTATE_MMCR1(r13) - ld r5, HSTATE_MMCRA(r13) - ld r6, HSTATE_SIAR(r13) - ld r7, HSTATE_SDAR(r13) - mtspr SPRN_MMCR1, r4 - mtspr SPRN_MMCRA, r5 - mtspr SPRN_SIAR, r6 - mtspr SPRN_SDAR, r7 -BEGIN_FTR_SECTION - ld r8, HSTATE_MMCR2(r13) - ld r9, HSTATE_SIER(r13) - mtspr SPRN_MMCR2, r8 - mtspr SPRN_SIER, r9 -END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) - mtspr SPRN_MMCR0, r3 - isync -23: + bl kvmhv_load_host_pmu /* * Reload DEC. HDEC interrupts were disabled when @@ -805,57 +768,12 @@ END_FTR_SECTION(CPU_FTR_TM | CPU_FTR_P9_TM_HV_ASSIST, 0) 91: #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) - mtspr SPRN_PMC1, r3 - mtspr SPRN_PMC2, r5 - mtspr SPRN_PMC3, r6 - mtspr SPRN_PMC4, r7 - mtspr SPRN_PMC5, r8 - mtspr SPRN_PMC6, r9 - 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) - mtspr SPRN_MMCR2, r5 - mtspr SPRN_SIER, r6 -BEGIN_FTR_SECTION_NESTED(96) - lwz r7, VCPU_PMC + 24(r4) - lwz r8, VCPU_PMC + 28(r4) - ld r9, VCPU_MMCR + 32(r4) - mtspr SPRN_SPMC1, r7 - mtspr SPRN_SPMC2, r8 - mtspr SPRN_MMCRS, r9 -END_FTR_SECTION_NESTED(CPU_FTR_ARCH_300, 0, 96) -END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) - mtspr SPRN_MMCR0, r3 - isync + /* Load guest PMU registers; r4 = vcpu pointer here */ + mr r3, r4 + bl kvmhv_load_guest_pmu /* Load up FP, VMX and VSX registers */ + ld r4, HSTATE_KVM_VCPU(r13) bl kvmppc_load_fp ld r14, VCPU_GPR(R14)(r4) @@ -1766,83 +1684,12 @@ END_FTR_SECTION(CPU_FTR_TM | CPU_FTR_P9_TM_HV_ASSIST, 0) 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 - /* Clear MMCRA in order to disable SDAR updates */ - li r7, 0 - mtspr SPRN_MMCRA, r7 - isync + mr r3, r9 + li r4, 1 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 - 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 - mfspr r5, SPRN_SIER - std r5, VCPU_SIER(r9) -BEGIN_FTR_SECTION_NESTED(96) - mfspr r6, SPRN_SPMC1 - mfspr r7, SPRN_SPMC2 - mfspr r8, SPRN_MMCRS - 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_NESTED(CPU_FTR_ARCH_300, 0, 96) -END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) -22: + lbz r4, LPPACA_PMCINUSE(r8) +21: bl kvmhv_save_guest_pmu + ld r9, HSTATE_KVM_VCPU(r13) /* Restore host values of some registers */ BEGIN_FTR_SECTION @@ -3388,6 +3235,194 @@ kvmppc_msr_interrupt: blr /* + * Load up guest PMU state. R3 points to the vcpu struct. + */ +_GLOBAL(kvmhv_load_guest_pmu) +EXPORT_SYMBOL_GPL(kvmhv_load_guest_pmu) + mr r4, r3 + mflr r0 + 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) + mtspr SPRN_PMC1, r3 + mtspr SPRN_PMC2, r5 + mtspr SPRN_PMC3, r6 + mtspr SPRN_PMC4, r7 + mtspr SPRN_PMC5, r8 + mtspr SPRN_PMC6, r9 + 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) + mtspr SPRN_MMCR2, r5 + mtspr SPRN_SIER, r6 +BEGIN_FTR_SECTION_NESTED(96) + lwz r7, VCPU_PMC + 24(r4) + lwz r8, VCPU_PMC + 28(r4) + ld r9, VCPU_MMCR + 32(r4) + mtspr SPRN_SPMC1, r7 + mtspr SPRN_SPMC2, r8 + mtspr SPRN_MMCRS, r9 +END_FTR_SECTION_NESTED(CPU_FTR_ARCH_300, 0, 96) +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) + mtspr SPRN_MMCR0, r3 + isync + mtlr r0 + blr + +/* + * Reload host PMU state saved in the PACA by kvmhv_save_host_pmu. + */ +_GLOBAL(kvmhv_load_host_pmu) +EXPORT_SYMBOL_GPL(kvmhv_load_host_pmu) + mflr r0 + lbz r4, PACA_PMCINUSE(r13) /* is the host using the PMU? */ + cmpwi r4, 0 + beq 23f /* skip if not */ +BEGIN_FTR_SECTION + ld r3, HSTATE_MMCR0(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_PMC1(r13) + lwz r4, HSTATE_PMC2(r13) + lwz r5, HSTATE_PMC3(r13) + lwz r6, HSTATE_PMC4(r13) + lwz r8, HSTATE_PMC5(r13) + lwz r9, HSTATE_PMC6(r13) + mtspr SPRN_PMC1, r3 + mtspr SPRN_PMC2, r4 + mtspr SPRN_PMC3, r5 + mtspr SPRN_PMC4, r6 + mtspr SPRN_PMC5, r8 + mtspr SPRN_PMC6, r9 + ld r3, HSTATE_MMCR0(r13) + ld r4, HSTATE_MMCR1(r13) + ld r5, HSTATE_MMCRA(r13) + ld r6, HSTATE_SIAR(r13) + ld r7, HSTATE_SDAR(r13) + mtspr SPRN_MMCR1, r4 + mtspr SPRN_MMCRA, r5 + mtspr SPRN_SIAR, r6 + mtspr SPRN_SDAR, r7 +BEGIN_FTR_SECTION + ld r8, HSTATE_MMCR2(r13) + ld r9, HSTATE_SIER(r13) + mtspr SPRN_MMCR2, r8 + mtspr SPRN_SIER, r9 +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) + mtspr SPRN_MMCR0, r3 + isync + mtlr r0 +23: blr + +/* + * Save guest PMU state into the vcpu struct. + * r3 = vcpu, r4 = full save flag (PMU in use flag set in VPA) + */ +_GLOBAL(kvmhv_save_guest_pmu) +EXPORT_SYMBOL_GPL(kvmhv_save_guest_pmu) + mr r9, r3 + mr r8, r4 +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 + /* Clear MMCRA in order to disable SDAR updates */ + li r7, 0 + mtspr SPRN_MMCRA, r7 + isync + cmpwi r8, 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 + 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 + mfspr r5, SPRN_SIER + std r5, VCPU_SIER(r9) +BEGIN_FTR_SECTION_NESTED(96) + mfspr r6, SPRN_SPMC1 + mfspr r7, SPRN_SPMC2 + mfspr r8, SPRN_MMCRS + 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_NESTED(CPU_FTR_ARCH_300, 0, 96) +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) +22: 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

[v2,04/33] KVM: PPC: Book3S HV: Extract PMU save/restore operations as C-callable functions

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Patch