From 616dff86028298dbc91174fb3d12b8ed8cd74955 Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Tue, 29 Apr 2014 16:48:44 +0200 Subject: [PATCH] KVM: PPC: Book3S PR: Handle Facility interrupt and FSCR POWER8 introduced a new interrupt type called "Facility unavailable interrupt" which contains its status message in a new register called FSCR. Handle these exits and try to emulate instructions for unhandled facilities. Follow-on patches enable KVM to expose specific facilities into the guest. Signed-off-by: Alexander Graf --- arch/powerpc/include/asm/kvm_asm.h | 18 +++--- arch/powerpc/include/asm/kvm_book3s_asm.h | 2 + arch/powerpc/include/asm/kvm_host.h | 1 + arch/powerpc/kernel/asm-offsets.c | 3 + arch/powerpc/kvm/book3s.c | 10 ++++ arch/powerpc/kvm/book3s_emulate.c | 6 ++ arch/powerpc/kvm/book3s_hv.c | 6 -- arch/powerpc/kvm/book3s_pr.c | 68 +++++++++++++++++++++++ arch/powerpc/kvm/book3s_segment.S | 25 +++++++++ 9 files changed, 125 insertions(+), 14 deletions(-) diff --git a/arch/powerpc/include/asm/kvm_asm.h b/arch/powerpc/include/asm/kvm_asm.h index 19eb74a95b59..9601741080e5 100644 --- a/arch/powerpc/include/asm/kvm_asm.h +++ b/arch/powerpc/include/asm/kvm_asm.h @@ -102,6 +102,7 @@ #define BOOK3S_INTERRUPT_PERFMON 0xf00 #define BOOK3S_INTERRUPT_ALTIVEC 0xf20 #define BOOK3S_INTERRUPT_VSX 0xf40 +#define BOOK3S_INTERRUPT_FAC_UNAVAIL 0xf60 #define BOOK3S_INTERRUPT_H_FAC_UNAVAIL 0xf80 #define BOOK3S_IRQPRIO_SYSTEM_RESET 0 @@ -114,14 +115,15 @@ #define BOOK3S_IRQPRIO_FP_UNAVAIL 7 #define BOOK3S_IRQPRIO_ALTIVEC 8 #define BOOK3S_IRQPRIO_VSX 9 -#define BOOK3S_IRQPRIO_SYSCALL 10 -#define BOOK3S_IRQPRIO_MACHINE_CHECK 11 -#define BOOK3S_IRQPRIO_DEBUG 12 -#define BOOK3S_IRQPRIO_EXTERNAL 13 -#define BOOK3S_IRQPRIO_DECREMENTER 14 -#define BOOK3S_IRQPRIO_PERFORMANCE_MONITOR 15 -#define BOOK3S_IRQPRIO_EXTERNAL_LEVEL 16 -#define BOOK3S_IRQPRIO_MAX 17 +#define BOOK3S_IRQPRIO_FAC_UNAVAIL 10 +#define BOOK3S_IRQPRIO_SYSCALL 11 +#define BOOK3S_IRQPRIO_MACHINE_CHECK 12 +#define BOOK3S_IRQPRIO_DEBUG 13 +#define BOOK3S_IRQPRIO_EXTERNAL 14 +#define BOOK3S_IRQPRIO_DECREMENTER 15 +#define BOOK3S_IRQPRIO_PERFORMANCE_MONITOR 16 +#define BOOK3S_IRQPRIO_EXTERNAL_LEVEL 17 +#define BOOK3S_IRQPRIO_MAX 18 #define BOOK3S_HFLAG_DCBZ32 0x1 #define BOOK3S_HFLAG_SLB 0x2 diff --git a/arch/powerpc/include/asm/kvm_book3s_asm.h b/arch/powerpc/include/asm/kvm_book3s_asm.h index 821725c1bf46..5bdfb5dd3400 100644 --- a/arch/powerpc/include/asm/kvm_book3s_asm.h +++ b/arch/powerpc/include/asm/kvm_book3s_asm.h @@ -104,6 +104,7 @@ struct kvmppc_host_state { #ifdef CONFIG_PPC_BOOK3S_64 u64 cfar; u64 ppr; + u64 host_fscr; #endif }; @@ -133,6 +134,7 @@ struct kvmppc_book3s_shadow_vcpu { u64 esid; u64 vsid; } slb[64]; /* guest SLB */ + u64 shadow_fscr; #endif }; diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 15f19d3cc584..232ec5f0b886 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -475,6 +475,7 @@ struct kvm_vcpu_arch { ulong ppr; ulong pspb; ulong fscr; + ulong shadow_fscr; ulong ebbhr; ulong ebbrr; ulong bescr; diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index bbf3b9a3e2af..e2b86b5c02b3 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -537,6 +537,7 @@ int main(void) DEFINE(VCPU_CFAR, offsetof(struct kvm_vcpu, arch.cfar)); DEFINE(VCPU_PPR, offsetof(struct kvm_vcpu, arch.ppr)); DEFINE(VCPU_FSCR, offsetof(struct kvm_vcpu, arch.fscr)); + DEFINE(VCPU_SHADOW_FSCR, offsetof(struct kvm_vcpu, arch.shadow_fscr)); DEFINE(VCPU_PSPB, offsetof(struct kvm_vcpu, arch.pspb)); DEFINE(VCPU_EBBHR, offsetof(struct kvm_vcpu, arch.ebbhr)); DEFINE(VCPU_EBBRR, offsetof(struct kvm_vcpu, arch.ebbrr)); @@ -618,6 +619,7 @@ int main(void) #ifdef CONFIG_PPC64 SVCPU_FIELD(SVCPU_SLB, slb); SVCPU_FIELD(SVCPU_SLB_MAX, slb_max); + SVCPU_FIELD(SVCPU_SHADOW_FSCR, shadow_fscr); #endif HSTATE_FIELD(HSTATE_HOST_R1, host_r1); @@ -653,6 +655,7 @@ int main(void) #ifdef CONFIG_PPC_BOOK3S_64 HSTATE_FIELD(HSTATE_CFAR, cfar); HSTATE_FIELD(HSTATE_PPR, ppr); + HSTATE_FIELD(HSTATE_HOST_FSCR, host_fscr); #endif /* CONFIG_PPC_BOOK3S_64 */ #else /* CONFIG_PPC_BOOK3S */ diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c index 81abc5cef0fe..79cfa2d10238 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -145,6 +145,7 @@ static int kvmppc_book3s_vec2irqprio(unsigned int vec) case 0xd00: prio = BOOK3S_IRQPRIO_DEBUG; break; case 0xf20: prio = BOOK3S_IRQPRIO_ALTIVEC; break; case 0xf40: prio = BOOK3S_IRQPRIO_VSX; break; + case 0xf60: prio = BOOK3S_IRQPRIO_FAC_UNAVAIL; break; default: prio = BOOK3S_IRQPRIO_MAX; break; } @@ -275,6 +276,9 @@ int kvmppc_book3s_irqprio_deliver(struct kvm_vcpu *vcpu, unsigned int priority) case BOOK3S_IRQPRIO_PERFORMANCE_MONITOR: vec = BOOK3S_INTERRUPT_PERFMON; break; + case BOOK3S_IRQPRIO_FAC_UNAVAIL: + vec = BOOK3S_INTERRUPT_FAC_UNAVAIL; + break; default: deliver = 0; printk(KERN_ERR "KVM: Unknown interrupt: 0x%x\n", priority); @@ -627,6 +631,9 @@ int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg) val = get_reg_val(reg->id, kvmppc_xics_get_icp(vcpu)); break; #endif /* CONFIG_KVM_XICS */ + case KVM_REG_PPC_FSCR: + val = get_reg_val(reg->id, vcpu->arch.fscr); + break; default: r = -EINVAL; break; @@ -716,6 +723,9 @@ int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg) set_reg_val(reg->id, val)); break; #endif /* CONFIG_KVM_XICS */ + case KVM_REG_PPC_FSCR: + vcpu->arch.fscr = set_reg_val(reg->id, val); + break; default: r = -EINVAL; break; diff --git a/arch/powerpc/kvm/book3s_emulate.c b/arch/powerpc/kvm/book3s_emulate.c index 0a1de29a4caf..e8133e5e89c6 100644 --- a/arch/powerpc/kvm/book3s_emulate.c +++ b/arch/powerpc/kvm/book3s_emulate.c @@ -438,6 +438,9 @@ int kvmppc_core_emulate_mtspr_pr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val) case SPRN_GQR7: to_book3s(vcpu)->gqr[sprn - SPRN_GQR0] = spr_val; break; + case SPRN_FSCR: + vcpu->arch.fscr = spr_val; + break; case SPRN_ICTC: case SPRN_THRM1: case SPRN_THRM2: @@ -545,6 +548,9 @@ int kvmppc_core_emulate_mfspr_pr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val case SPRN_GQR7: *spr_val = to_book3s(vcpu)->gqr[sprn - SPRN_GQR0]; break; + case SPRN_FSCR: + *spr_val = vcpu->arch.fscr; + break; case SPRN_THRM1: case SPRN_THRM2: case SPRN_THRM3: diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 030821a414a8..0092e12b3e46 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -879,9 +879,6 @@ static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, case KVM_REG_PPC_IAMR: *val = get_reg_val(id, vcpu->arch.iamr); break; - case KVM_REG_PPC_FSCR: - *val = get_reg_val(id, vcpu->arch.fscr); - break; case KVM_REG_PPC_PSPB: *val = get_reg_val(id, vcpu->arch.pspb); break; @@ -1091,9 +1088,6 @@ static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, case KVM_REG_PPC_IAMR: vcpu->arch.iamr = set_reg_val(id, *val); break; - case KVM_REG_PPC_FSCR: - vcpu->arch.fscr = set_reg_val(id, *val); - break; case KVM_REG_PPC_PSPB: vcpu->arch.pspb = set_reg_val(id, *val); break; diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index 6e55934dda0a..ddc626eea2da 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -53,6 +53,7 @@ static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr, ulong msr); +static void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac); /* Some compatibility defines */ #ifdef CONFIG_PPC_BOOK3S_32 @@ -115,6 +116,9 @@ void kvmppc_copy_to_svcpu(struct kvmppc_book3s_shadow_vcpu *svcpu, svcpu->ctr = vcpu->arch.ctr; svcpu->lr = vcpu->arch.lr; svcpu->pc = vcpu->arch.pc; +#ifdef CONFIG_PPC_BOOK3S_64 + svcpu->shadow_fscr = vcpu->arch.shadow_fscr; +#endif svcpu->in_use = true; } @@ -158,6 +162,9 @@ void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu, vcpu->arch.fault_dar = svcpu->fault_dar; vcpu->arch.fault_dsisr = svcpu->fault_dsisr; vcpu->arch.last_inst = svcpu->last_inst; +#ifdef CONFIG_PPC_BOOK3S_64 + vcpu->arch.shadow_fscr = svcpu->shadow_fscr; +#endif svcpu->in_use = false; out: @@ -610,6 +617,17 @@ void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr) kvmppc_recalc_shadow_msr(vcpu); } +/* Give up facility (TAR / EBB / DSCR) */ +static void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac) +{ +#ifdef CONFIG_PPC_BOOK3S_64 + if (!(vcpu->arch.shadow_fscr & (1ULL << fac))) { + /* Facility not available to the guest, ignore giveup request*/ + return; + } +#endif +} + static int kvmppc_read_inst(struct kvm_vcpu *vcpu) { ulong srr0 = kvmppc_get_pc(vcpu); @@ -741,6 +759,50 @@ static void kvmppc_handle_lost_ext(struct kvm_vcpu *vcpu) current->thread.regs->msr |= lost_ext; } +#ifdef CONFIG_PPC_BOOK3S_64 + +static void kvmppc_trigger_fac_interrupt(struct kvm_vcpu *vcpu, ulong fac) +{ + /* Inject the Interrupt Cause field and trigger a guest interrupt */ + vcpu->arch.fscr &= ~(0xffULL << 56); + vcpu->arch.fscr |= (fac << 56); + kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_FAC_UNAVAIL); +} + +static void kvmppc_emulate_fac(struct kvm_vcpu *vcpu, ulong fac) +{ + enum emulation_result er = EMULATE_FAIL; + + if (!(kvmppc_get_msr(vcpu) & MSR_PR)) + er = kvmppc_emulate_instruction(vcpu->run, vcpu); + + if ((er != EMULATE_DONE) && (er != EMULATE_AGAIN)) { + /* Couldn't emulate, trigger interrupt in guest */ + kvmppc_trigger_fac_interrupt(vcpu, fac); + } +} + +/* Enable facilities (TAR, EBB, DSCR) for the guest */ +static int kvmppc_handle_fac(struct kvm_vcpu *vcpu, ulong fac) +{ + BUG_ON(!cpu_has_feature(CPU_FTR_ARCH_207S)); + + if (!(vcpu->arch.fscr & (1ULL << fac))) { + /* Facility not enabled by the guest */ + kvmppc_trigger_fac_interrupt(vcpu, fac); + return RESUME_GUEST; + } + + switch (fac) { + default: + kvmppc_emulate_fac(vcpu, fac); + break; + } + + return RESUME_GUEST; +} +#endif + int kvmppc_handle_exit_pr(struct kvm_run *run, struct kvm_vcpu *vcpu, unsigned int exit_nr) { @@ -1015,6 +1077,12 @@ program_interrupt: } r = RESUME_GUEST; break; +#ifdef CONFIG_PPC_BOOK3S_64 + case BOOK3S_INTERRUPT_FAC_UNAVAIL: + kvmppc_handle_fac(vcpu, vcpu->arch.shadow_fscr >> 56); + r = RESUME_GUEST; + break; +#endif case BOOK3S_INTERRUPT_MACHINE_CHECK: case BOOK3S_INTERRUPT_TRACE: kvmppc_book3s_queue_irqprio(vcpu, exit_nr); diff --git a/arch/powerpc/kvm/book3s_segment.S b/arch/powerpc/kvm/book3s_segment.S index 1e0cc2adfd40..acee37cde840 100644 --- a/arch/powerpc/kvm/book3s_segment.S +++ b/arch/powerpc/kvm/book3s_segment.S @@ -90,6 +90,15 @@ kvmppc_handler_trampoline_enter: LOAD_GUEST_SEGMENTS #ifdef CONFIG_PPC_BOOK3S_64 +BEGIN_FTR_SECTION + /* Save host FSCR */ + mfspr r8, SPRN_FSCR + std r8, HSTATE_HOST_FSCR(r13) + /* Set FSCR during guest execution */ + ld r9, SVCPU_SHADOW_FSCR(r13) + mtspr SPRN_FSCR, r9 +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) + /* Some guests may need to have dcbz set to 32 byte length. * * Usually we ensure that by patching the guest's instructions @@ -255,6 +264,10 @@ BEGIN_FTR_SECTION cmpwi r12, BOOK3S_INTERRUPT_H_EMUL_ASSIST beq- ld_last_inst END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) +BEGIN_FTR_SECTION + cmpwi r12, BOOK3S_INTERRUPT_FAC_UNAVAIL + beq- ld_last_inst +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) #endif b no_ld_last_inst @@ -311,6 +324,18 @@ no_ld_last_inst: no_dcbz32_off: +BEGIN_FTR_SECTION + /* Save guest FSCR on a FAC_UNAVAIL interrupt */ + cmpwi r12, BOOK3S_INTERRUPT_FAC_UNAVAIL + bne+ no_fscr_save + mfspr r7, SPRN_FSCR + std r7, SVCPU_SHADOW_FSCR(r13) +no_fscr_save: + /* Restore host FSCR */ + ld r8, HSTATE_HOST_FSCR(r13) + mtspr SPRN_FSCR, r8 +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) + #endif /* CONFIG_PPC_BOOK3S_64 */ /* -- 2.20.1