diff options
| -rw-r--r-- | target/ppc/kvm.c | 117 |
1 files changed, 20 insertions, 97 deletions
diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c index 4df4ff6cbf..b6000f12b9 100644 --- a/target/ppc/kvm.c +++ b/target/ppc/kvm.c @@ -248,107 +248,25 @@ static int kvm_booke206_tlb_init(PowerPCCPU *cpu) #if defined(TARGET_PPC64) -static void kvm_get_fallback_smmu_info(PowerPCCPU *cpu, - struct kvm_ppc_smmu_info *info) +static void kvm_get_smmu_info(PowerPCCPU *cpu, struct kvm_ppc_smmu_info *info, + Error **errp) { - CPUPPCState *env = &cpu->env; CPUState *cs = CPU(cpu); + int ret; - memset(info, 0, sizeof(*info)); - - /* We don't have the new KVM_PPC_GET_SMMU_INFO ioctl, so - * need to "guess" what the supported page sizes are. - * - * For that to work we make a few assumptions: - * - * - Check whether we are running "PR" KVM which only supports 4K - * and 16M pages, but supports them regardless of the backing - * store characteritics. We also don't support 1T segments. - * - * This is safe as if HV KVM ever supports that capability or PR - * KVM grows supports for more page/segment sizes, those versions - * will have implemented KVM_CAP_PPC_GET_SMMU_INFO and thus we - * will not hit this fallback - * - * - Else we are running HV KVM. This means we only support page - * sizes that fit in the backing store. Additionally we only - * advertize 64K pages if the processor is ARCH 2.06 and we assume - * P7 encodings for the SLB and hash table. Here too, we assume - * support for any newer processor will mean a kernel that - * implements KVM_CAP_PPC_GET_SMMU_INFO and thus doesn't hit - * this fallback. - */ - if (kvmppc_is_pr(cs->kvm_state)) { - /* No flags */ - info->flags = 0; - info->slb_size = 64; - - /* Standard 4k base page size segment */ - info->sps[0].page_shift = 12; - info->sps[0].slb_enc = 0; - info->sps[0].enc[0].page_shift = 12; - info->sps[0].enc[0].pte_enc = 0; - - /* Standard 16M large page size segment */ - info->sps[1].page_shift = 24; - info->sps[1].slb_enc = SLB_VSID_L; - info->sps[1].enc[0].page_shift = 24; - info->sps[1].enc[0].pte_enc = 0; - } else { - int i = 0; - - /* HV KVM has backing store size restrictions */ - info->flags = KVM_PPC_PAGE_SIZES_REAL; - - if (ppc_hash64_has(cpu, PPC_HASH64_1TSEG)) { - info->flags |= KVM_PPC_1T_SEGMENTS; - } - - if (env->mmu_model == POWERPC_MMU_2_06 || - env->mmu_model == POWERPC_MMU_2_07) { - info->slb_size = 32; - } else { - info->slb_size = 64; - } - - /* Standard 4k base page size segment */ - info->sps[i].page_shift = 12; - info->sps[i].slb_enc = 0; - info->sps[i].enc[0].page_shift = 12; - info->sps[i].enc[0].pte_enc = 0; - i++; - - /* 64K on MMU 2.06 and later */ - if (env->mmu_model == POWERPC_MMU_2_06 || - env->mmu_model == POWERPC_MMU_2_07) { - info->sps[i].page_shift = 16; - info->sps[i].slb_enc = 0x110; - info->sps[i].enc[0].page_shift = 16; - info->sps[i].enc[0].pte_enc = 1; - i++; - } - - /* Standard 16M large page size segment */ - info->sps[i].page_shift = 24; - info->sps[i].slb_enc = SLB_VSID_L; - info->sps[i].enc[0].page_shift = 24; - info->sps[i].enc[0].pte_enc = 0; + if (!kvm_check_extension(cs->kvm_state, KVM_CAP_PPC_GET_SMMU_INFO)) { + error_setg(errp, "KVM doesn't expose the MMU features it supports"); + error_append_hint(errp, "Consider switching to a newer KVM\n"); + return; } -} - -static void kvm_get_smmu_info(PowerPCCPU *cpu, struct kvm_ppc_smmu_info *info) -{ - CPUState *cs = CPU(cpu); - int ret; - if (kvm_check_extension(cs->kvm_state, KVM_CAP_PPC_GET_SMMU_INFO)) { - ret = kvm_vm_ioctl(cs->kvm_state, KVM_PPC_GET_SMMU_INFO, info); - if (ret == 0) { - return; - } + ret = kvm_vm_ioctl(cs->kvm_state, KVM_PPC_GET_SMMU_INFO, info); + if (ret == 0) { + return; } - kvm_get_fallback_smmu_info(cpu, info); + error_setg_errno(errp, -ret, + "KVM failed to provide the MMU features it supports"); } struct ppc_radix_page_info *kvm_get_radix_page_info(void) @@ -415,7 +333,7 @@ bool kvmppc_hpt_needs_host_contiguous_pages(void) return false; } - kvm_get_smmu_info(cpu, &smmu_info); + kvm_get_smmu_info(cpu, &smmu_info, &error_fatal); return !!(smmu_info.flags & KVM_PPC_PAGE_SIZES_REAL); } @@ -423,13 +341,18 @@ void kvm_check_mmu(PowerPCCPU *cpu, Error **errp) { struct kvm_ppc_smmu_info smmu_info; int iq, ik, jq, jk; + Error *local_err = NULL; /* For now, we only have anything to check on hash64 MMUs */ if (!cpu->hash64_opts || !kvm_enabled()) { return; } - kvm_get_smmu_info(cpu, &smmu_info); + kvm_get_smmu_info(cpu, &smmu_info, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } if (ppc_hash64_has(cpu, PPC_HASH64_1TSEG) && !(smmu_info.flags & KVM_PPC_1T_SEGMENTS)) { @@ -2168,7 +2091,7 @@ uint64_t kvmppc_rma_size(uint64_t current_size, unsigned int hash_shift) /* Find the largest hardware supported page size that's less than * or equal to the (logical) backing page size of guest RAM */ - kvm_get_smmu_info(POWERPC_CPU(first_cpu), &info); + kvm_get_smmu_info(POWERPC_CPU(first_cpu), &info, &error_fatal); rampagesize = qemu_getrampagesize(); best_page_shift = 0; |