diff options
| -rw-r--r-- | arch/powerpc/include/asm/kvm_asm.h | 2 | ||||
| -rw-r--r-- | arch/powerpc/kvm/book3s_64_entry.S | 15 | ||||
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv.c | 4 | ||||
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv_p9_entry.c | 36 |
4 files changed, 44 insertions, 13 deletions
diff --git a/arch/powerpc/include/asm/kvm_asm.h b/arch/powerpc/include/asm/kvm_asm.h index e479487488f4..fbbf3cec92e9 100644 --- a/arch/powerpc/include/asm/kvm_asm.h +++ b/arch/powerpc/include/asm/kvm_asm.h @@ -147,7 +147,7 @@ #define KVM_GUEST_MODE_SKIP 2 #define KVM_GUEST_MODE_GUEST_HV 3 #define KVM_GUEST_MODE_HOST_HV 4 -#define KVM_GUEST_MODE_HV_FAST 5 /* ISA >= v3.0 host radix */ +#define KVM_GUEST_MODE_HV_P9 5 /* ISA >= v3.0 path */ #define KVM_INST_FETCH_FAILED -1 diff --git a/arch/powerpc/kvm/book3s_64_entry.S b/arch/powerpc/kvm/book3s_64_entry.S index 7322fea971e4..983b8c18bc31 100644 --- a/arch/powerpc/kvm/book3s_64_entry.S +++ b/arch/powerpc/kvm/book3s_64_entry.S @@ -36,7 +36,7 @@ kvmppc_hcall: #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE lbz r10,HSTATE_IN_GUEST(r13) - cmpwi r10,KVM_GUEST_MODE_HV_FAST + cmpwi r10,KVM_GUEST_MODE_HV_P9 beq kvmppc_p9_exit_hcall #endif ld r10,PACA_EXGEN+EX_R13(r13) @@ -68,7 +68,7 @@ kvmppc_interrupt: #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE std r10,HSTATE_SCRATCH0(r13) lbz r10,HSTATE_IN_GUEST(r13) - cmpwi r10,KVM_GUEST_MODE_HV_FAST + cmpwi r10,KVM_GUEST_MODE_HV_P9 beq kvmppc_p9_exit_interrupt ld r10,HSTATE_SCRATCH0(r13) #endif @@ -183,8 +183,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) /* * void kvmppc_p9_enter_guest(struct vcpu *vcpu); * - * Enter the guest on a ISAv3.0 or later system where we have exactly - * one vcpu per vcore, and the host is radix. + * Enter the guest on a ISAv3.0 or later system. */ .balign IFETCH_ALIGN_BYTES _GLOBAL(kvmppc_p9_enter_guest) @@ -284,7 +283,7 @@ kvmppc_p9_exit_hcall: .balign IFETCH_ALIGN_BYTES kvmppc_p9_exit_interrupt: /* - * If set to KVM_GUEST_MODE_HV_FAST but we're still in the + * If set to KVM_GUEST_MODE_HV_P9 but we're still in the * hypervisor, that means we can't return from the entry stack. */ rldicl. r10,r12,64-MSR_HV_LG,63 @@ -358,6 +357,12 @@ kvmppc_p9_exit_interrupt: * effort for a small bit of code. Lots of other things to do first. */ kvmppc_p9_bad_interrupt: +BEGIN_MMU_FTR_SECTION + /* + * Hash host doesn't try to recover MMU (requires host SLB reload) + */ + b . +END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX) /* * Clean up guest registers to give host a chance to run. */ diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 662f599bdc0e..045458e7192a 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -4511,7 +4511,7 @@ static int kvmppc_vcpu_run_hv(struct kvm_vcpu *vcpu) vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; do { - if (radix_enabled()) + if (cpu_has_feature(CPU_FTR_ARCH_300)) r = kvmhv_run_single_vcpu(vcpu, ~(u64)0, vcpu->arch.vcore->lpcr); else @@ -5599,6 +5599,8 @@ static int kvmhv_enable_nested(struct kvm *kvm) return -EPERM; if (!cpu_has_feature(CPU_FTR_ARCH_300)) return -ENODEV; + if (!radix_enabled()) + return -ENODEV; /* kvm == NULL means the caller is testing if the capability exists */ if (kvm) diff --git a/arch/powerpc/kvm/book3s_hv_p9_entry.c b/arch/powerpc/kvm/book3s_hv_p9_entry.c index 4460f1c23a9d..83f592eadcd2 100644 --- a/arch/powerpc/kvm/book3s_hv_p9_entry.c +++ b/arch/powerpc/kvm/book3s_hv_p9_entry.c @@ -130,7 +130,7 @@ static void switch_mmu_to_guest_hpt(struct kvm *kvm, struct kvm_vcpu *vcpu, u64 isync(); } -static void switch_mmu_to_host_radix(struct kvm *kvm, u32 pid) +static void switch_mmu_to_host(struct kvm *kvm, u32 pid) { isync(); mtspr(SPRN_PID, pid); @@ -139,6 +139,22 @@ static void switch_mmu_to_host_radix(struct kvm *kvm, u32 pid) isync(); mtspr(SPRN_LPCR, kvm->arch.host_lpcr); isync(); + + if (!radix_enabled()) + slb_restore_bolted_realmode(); +} + +static void save_clear_host_mmu(struct kvm *kvm) +{ + if (!radix_enabled()) { + /* + * Hash host could save and restore host SLB entries to + * reduce SLB fault overheads of VM exits, but for now the + * existing code clears all entries and restores just the + * bolted ones when switching back to host. + */ + slb_clear_invalidate_partition(); + } } static void save_clear_guest_mmu(struct kvm *kvm, struct kvm_vcpu *vcpu) @@ -271,16 +287,24 @@ int kvmhv_vcpu_entry_p9(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpc mtspr(SPRN_AMOR, ~0UL); - local_paca->kvm_hstate.in_guest = KVM_GUEST_MODE_HV_FAST; + local_paca->kvm_hstate.in_guest = KVM_GUEST_MODE_HV_P9; + + /* + * Hash host, hash guest, or radix guest with prefetch bug, all have + * to disable the MMU before switching to guest MMU state. + */ + if (!radix_enabled() || !kvm_is_radix(kvm) || + cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG)) + __mtmsrd(msr & ~(MSR_IR|MSR_DR|MSR_RI), 0); + + save_clear_host_mmu(kvm); + if (kvm_is_radix(kvm)) { - if (cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG)) - __mtmsrd(msr & ~(MSR_IR|MSR_DR|MSR_RI), 0); switch_mmu_to_guest_radix(kvm, vcpu, lpcr); if (!cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG)) __mtmsrd(0, 1); /* clear RI */ } else { - __mtmsrd(msr & ~(MSR_IR|MSR_DR|MSR_RI), 0); switch_mmu_to_guest_hpt(kvm, vcpu, lpcr); } @@ -468,7 +492,7 @@ int kvmhv_vcpu_entry_p9(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpc mtspr(SPRN_HDEC, 0x7fffffff); save_clear_guest_mmu(kvm, vcpu); - switch_mmu_to_host_radix(kvm, host_pidr); + switch_mmu_to_host(kvm, host_pidr); local_paca->kvm_hstate.in_guest = KVM_GUEST_MODE_NONE; /* |