diff options
Diffstat (limited to 'arch/arm64/kvm/nested.c')
| -rw-r--r-- | arch/arm64/kvm/nested.c | 298 |
1 files changed, 165 insertions, 133 deletions
diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c index 0c9387d2f507..4a3fc11f7ecf 100644 --- a/arch/arm64/kvm/nested.c +++ b/arch/arm64/kvm/nested.c @@ -16,9 +16,6 @@ #include "sys_regs.h" -/* Protection against the sysreg repainting madness... */ -#define NV_FTR(r, f) ID_AA64##r##_EL1_##f - /* * Ratio of live shadow S2 MMU per vcpu. This is a trade-off between * memory usage and potential number of different sets of S2 PTs in @@ -54,6 +51,10 @@ int kvm_vcpu_init_nested(struct kvm_vcpu *vcpu) struct kvm_s2_mmu *tmp; int num_mmus, ret = 0; + if (test_bit(KVM_ARM_VCPU_HAS_EL2_E2H0, kvm->arch.vcpu_features) && + !cpus_have_final_cap(ARM64_HAS_HCR_NV1)) + return -EINVAL; + /* * Let's treat memory allocation failures as benign: If we fail to * allocate anything, return an error and keep the allocated array @@ -807,134 +808,151 @@ void kvm_arch_flush_shadow_all(struct kvm *kvm) * This list should get updated as new features get added to the NV * support, and new extension to the architecture. */ -static void limit_nv_id_regs(struct kvm *kvm) +u64 limit_nv_id_reg(struct kvm *kvm, u32 reg, u64 val) { - u64 val, tmp; - - /* Support everything but TME */ - val = kvm_read_vm_id_reg(kvm, SYS_ID_AA64ISAR0_EL1); - val &= ~NV_FTR(ISAR0, TME); - kvm_set_vm_id_reg(kvm, SYS_ID_AA64ISAR0_EL1, val); - - /* Support everything but Spec Invalidation and LS64 */ - val = kvm_read_vm_id_reg(kvm, SYS_ID_AA64ISAR1_EL1); - val &= ~(NV_FTR(ISAR1, LS64) | - NV_FTR(ISAR1, SPECRES)); - kvm_set_vm_id_reg(kvm, SYS_ID_AA64ISAR1_EL1, val); - - /* No AMU, MPAM, S-EL2, or RAS */ - val = kvm_read_vm_id_reg(kvm, SYS_ID_AA64PFR0_EL1); - val &= ~(GENMASK_ULL(55, 52) | - NV_FTR(PFR0, AMU) | - NV_FTR(PFR0, MPAM) | - NV_FTR(PFR0, SEL2) | - NV_FTR(PFR0, RAS) | - NV_FTR(PFR0, EL3) | - NV_FTR(PFR0, EL2) | - NV_FTR(PFR0, EL1) | - NV_FTR(PFR0, EL0)); - /* 64bit only at any EL */ - val |= FIELD_PREP(NV_FTR(PFR0, EL0), 0b0001); - val |= FIELD_PREP(NV_FTR(PFR0, EL1), 0b0001); - val |= FIELD_PREP(NV_FTR(PFR0, EL2), 0b0001); - val |= FIELD_PREP(NV_FTR(PFR0, EL3), 0b0001); - kvm_set_vm_id_reg(kvm, SYS_ID_AA64PFR0_EL1, val); - - /* Only support BTI, SSBS, CSV2_frac */ - val = kvm_read_vm_id_reg(kvm, SYS_ID_AA64PFR1_EL1); - val &= (NV_FTR(PFR1, BT) | - NV_FTR(PFR1, SSBS) | - NV_FTR(PFR1, CSV2_frac)); - kvm_set_vm_id_reg(kvm, SYS_ID_AA64PFR1_EL1, val); - - /* Hide ECV, ExS, Secure Memory */ - val = kvm_read_vm_id_reg(kvm, SYS_ID_AA64MMFR0_EL1); - val &= ~(NV_FTR(MMFR0, ECV) | - NV_FTR(MMFR0, EXS) | - NV_FTR(MMFR0, TGRAN4_2) | - NV_FTR(MMFR0, TGRAN16_2) | - NV_FTR(MMFR0, TGRAN64_2) | - NV_FTR(MMFR0, SNSMEM)); - - /* Disallow unsupported S2 page sizes */ - switch (PAGE_SIZE) { - case SZ_64K: - val |= FIELD_PREP(NV_FTR(MMFR0, TGRAN16_2), 0b0001); - fallthrough; - case SZ_16K: - val |= FIELD_PREP(NV_FTR(MMFR0, TGRAN4_2), 0b0001); - fallthrough; - case SZ_4K: - /* Support everything */ + switch (reg) { + case SYS_ID_AA64ISAR0_EL1: + /* Support everything but TME */ + val &= ~ID_AA64ISAR0_EL1_TME; break; - } - /* - * Since we can't support a guest S2 page size smaller than - * the host's own page size (due to KVM only populating its - * own S2 using the kernel's page size), advertise the - * limitation using FEAT_GTG. - */ - switch (PAGE_SIZE) { - case SZ_4K: - val |= FIELD_PREP(NV_FTR(MMFR0, TGRAN4_2), 0b0010); - fallthrough; - case SZ_16K: - val |= FIELD_PREP(NV_FTR(MMFR0, TGRAN16_2), 0b0010); - fallthrough; - case SZ_64K: - val |= FIELD_PREP(NV_FTR(MMFR0, TGRAN64_2), 0b0010); + + case SYS_ID_AA64ISAR1_EL1: + /* Support everything but LS64 and Spec Invalidation */ + val &= ~(ID_AA64ISAR1_EL1_LS64 | + ID_AA64ISAR1_EL1_SPECRES); + break; + + case SYS_ID_AA64PFR0_EL1: + /* No RME, AMU, MPAM, S-EL2, or RAS */ + val &= ~(ID_AA64PFR0_EL1_RME | + ID_AA64PFR0_EL1_AMU | + ID_AA64PFR0_EL1_MPAM | + ID_AA64PFR0_EL1_SEL2 | + ID_AA64PFR0_EL1_RAS | + ID_AA64PFR0_EL1_EL3 | + ID_AA64PFR0_EL1_EL2 | + ID_AA64PFR0_EL1_EL1 | + ID_AA64PFR0_EL1_EL0); + /* 64bit only at any EL */ + val |= SYS_FIELD_PREP_ENUM(ID_AA64PFR0_EL1, EL0, IMP); + val |= SYS_FIELD_PREP_ENUM(ID_AA64PFR0_EL1, EL1, IMP); + val |= SYS_FIELD_PREP_ENUM(ID_AA64PFR0_EL1, EL2, IMP); + val |= SYS_FIELD_PREP_ENUM(ID_AA64PFR0_EL1, EL3, IMP); + break; + + case SYS_ID_AA64PFR1_EL1: + /* Only support BTI, SSBS, CSV2_frac */ + val &= (ID_AA64PFR1_EL1_BT | + ID_AA64PFR1_EL1_SSBS | + ID_AA64PFR1_EL1_CSV2_frac); + break; + + case SYS_ID_AA64MMFR0_EL1: + /* Hide ExS, Secure Memory */ + val &= ~(ID_AA64MMFR0_EL1_EXS | + ID_AA64MMFR0_EL1_TGRAN4_2 | + ID_AA64MMFR0_EL1_TGRAN16_2 | + ID_AA64MMFR0_EL1_TGRAN64_2 | + ID_AA64MMFR0_EL1_SNSMEM); + + /* Hide CNTPOFF if present */ + val = ID_REG_LIMIT_FIELD_ENUM(val, ID_AA64MMFR0_EL1, ECV, IMP); + + /* Disallow unsupported S2 page sizes */ + switch (PAGE_SIZE) { + case SZ_64K: + val |= SYS_FIELD_PREP_ENUM(ID_AA64MMFR0_EL1, TGRAN16_2, NI); + fallthrough; + case SZ_16K: + val |= SYS_FIELD_PREP_ENUM(ID_AA64MMFR0_EL1, TGRAN4_2, NI); + fallthrough; + case SZ_4K: + /* Support everything */ + break; + } + + /* + * Since we can't support a guest S2 page size smaller + * than the host's own page size (due to KVM only + * populating its own S2 using the kernel's page + * size), advertise the limitation using FEAT_GTG. + */ + switch (PAGE_SIZE) { + case SZ_4K: + val |= SYS_FIELD_PREP_ENUM(ID_AA64MMFR0_EL1, TGRAN4_2, IMP); + fallthrough; + case SZ_16K: + val |= SYS_FIELD_PREP_ENUM(ID_AA64MMFR0_EL1, TGRAN16_2, IMP); + fallthrough; + case SZ_64K: + val |= SYS_FIELD_PREP_ENUM(ID_AA64MMFR0_EL1, TGRAN64_2, IMP); + break; + } + + /* Cap PARange to 48bits */ + val = ID_REG_LIMIT_FIELD_ENUM(val, ID_AA64MMFR0_EL1, PARANGE, 48); + break; + + case SYS_ID_AA64MMFR1_EL1: + val &= (ID_AA64MMFR1_EL1_HCX | + ID_AA64MMFR1_EL1_PAN | + ID_AA64MMFR1_EL1_LO | + ID_AA64MMFR1_EL1_HPDS | + ID_AA64MMFR1_EL1_VH | + ID_AA64MMFR1_EL1_VMIDBits); + /* FEAT_E2H0 implies no VHE */ + if (test_bit(KVM_ARM_VCPU_HAS_EL2_E2H0, kvm->arch.vcpu_features)) + val &= ~ID_AA64MMFR1_EL1_VH; + break; + + case SYS_ID_AA64MMFR2_EL1: + val &= ~(ID_AA64MMFR2_EL1_BBM | + ID_AA64MMFR2_EL1_TTL | + GENMASK_ULL(47, 44) | + ID_AA64MMFR2_EL1_ST | + ID_AA64MMFR2_EL1_CCIDX | + ID_AA64MMFR2_EL1_VARange); + + /* Force TTL support */ + val |= SYS_FIELD_PREP_ENUM(ID_AA64MMFR2_EL1, TTL, IMP); + break; + + case SYS_ID_AA64MMFR4_EL1: + /* + * You get EITHER + * + * - FEAT_VHE without FEAT_E2H0 + * - FEAT_NV limited to FEAT_NV2 + * - HCR_EL2.NV1 being RES0 + * + * OR + * + * - FEAT_E2H0 without FEAT_VHE nor FEAT_NV + * + * Life is too short for anything else. + */ + if (test_bit(KVM_ARM_VCPU_HAS_EL2_E2H0, kvm->arch.vcpu_features)) { + val = 0; + } else { + val = SYS_FIELD_PREP_ENUM(ID_AA64MMFR4_EL1, NV_frac, NV2_ONLY); + val |= SYS_FIELD_PREP_ENUM(ID_AA64MMFR4_EL1, E2H0, NI_NV1); + } + break; + + case SYS_ID_AA64DFR0_EL1: + /* Only limited support for PMU, Debug, BPs, WPs, and HPMN0 */ + val &= (ID_AA64DFR0_EL1_PMUVer | + ID_AA64DFR0_EL1_WRPs | + ID_AA64DFR0_EL1_BRPs | + ID_AA64DFR0_EL1_DebugVer| + ID_AA64DFR0_EL1_HPMN0); + + /* Cap Debug to ARMv8.1 */ + val = ID_REG_LIMIT_FIELD_ENUM(val, ID_AA64DFR0_EL1, DebugVer, VHE); break; } - /* Cap PARange to 48bits */ - tmp = FIELD_GET(NV_FTR(MMFR0, PARANGE), val); - if (tmp > 0b0101) { - val &= ~NV_FTR(MMFR0, PARANGE); - val |= FIELD_PREP(NV_FTR(MMFR0, PARANGE), 0b0101); - } - kvm_set_vm_id_reg(kvm, SYS_ID_AA64MMFR0_EL1, val); - - val = kvm_read_vm_id_reg(kvm, SYS_ID_AA64MMFR1_EL1); - val &= (NV_FTR(MMFR1, HCX) | - NV_FTR(MMFR1, PAN) | - NV_FTR(MMFR1, LO) | - NV_FTR(MMFR1, HPDS) | - NV_FTR(MMFR1, VH) | - NV_FTR(MMFR1, VMIDBits)); - kvm_set_vm_id_reg(kvm, SYS_ID_AA64MMFR1_EL1, val); - - val = kvm_read_vm_id_reg(kvm, SYS_ID_AA64MMFR2_EL1); - val &= ~(NV_FTR(MMFR2, BBM) | - NV_FTR(MMFR2, TTL) | - GENMASK_ULL(47, 44) | - NV_FTR(MMFR2, ST) | - NV_FTR(MMFR2, CCIDX) | - NV_FTR(MMFR2, VARange)); - - /* Force TTL support */ - val |= FIELD_PREP(NV_FTR(MMFR2, TTL), 0b0001); - kvm_set_vm_id_reg(kvm, SYS_ID_AA64MMFR2_EL1, val); - - val = 0; - if (!cpus_have_final_cap(ARM64_HAS_HCR_NV1)) - val |= FIELD_PREP(NV_FTR(MMFR4, E2H0), - ID_AA64MMFR4_EL1_E2H0_NI_NV1); - kvm_set_vm_id_reg(kvm, SYS_ID_AA64MMFR4_EL1, val); - - /* Only limited support for PMU, Debug, BPs, WPs, and HPMN0 */ - val = kvm_read_vm_id_reg(kvm, SYS_ID_AA64DFR0_EL1); - val &= (NV_FTR(DFR0, PMUVer) | - NV_FTR(DFR0, WRPs) | - NV_FTR(DFR0, BRPs) | - NV_FTR(DFR0, DebugVer) | - NV_FTR(DFR0, HPMN0)); - - /* Cap Debug to ARMv8.1 */ - tmp = FIELD_GET(NV_FTR(DFR0, DebugVer), val); - if (tmp > 0b0111) { - val &= ~NV_FTR(DFR0, DebugVer); - val |= FIELD_PREP(NV_FTR(DFR0, DebugVer), 0b0111); - } - kvm_set_vm_id_reg(kvm, SYS_ID_AA64DFR0_EL1, val); + + return val; } u64 kvm_vcpu_apply_reg_masks(const struct kvm_vcpu *vcpu, @@ -981,8 +999,6 @@ int kvm_init_nv_sysregs(struct kvm_vcpu *vcpu) if (!kvm->arch.sysreg_masks) return -ENOMEM; - limit_nv_id_regs(kvm); - /* VTTBR_EL2 */ res0 = res1 = 0; if (!kvm_has_feat_enum(kvm, ID_AA64MMFR1_EL1, VMIDBits, 16)) @@ -1021,10 +1037,11 @@ int kvm_init_nv_sysregs(struct kvm_vcpu *vcpu) res0 |= HCR_FIEN; if (!kvm_has_feat(kvm, ID_AA64MMFR2_EL1, FWB, IMP)) res0 |= HCR_FWB; - if (!kvm_has_feat(kvm, ID_AA64MMFR2_EL1, NV, NV2)) - res0 |= HCR_NV2; - if (!kvm_has_feat(kvm, ID_AA64MMFR2_EL1, NV, IMP)) - res0 |= (HCR_AT | HCR_NV1 | HCR_NV); + /* Implementation choice: NV2 is the only supported config */ + if (!kvm_has_feat(kvm, ID_AA64MMFR4_EL1, NV_frac, NV2_ONLY)) + res0 |= (HCR_NV2 | HCR_NV | HCR_AT); + if (!kvm_has_feat(kvm, ID_AA64MMFR4_EL1, E2H0, NI)) + res0 |= HCR_NV1; if (!(kvm_vcpu_has_feature(kvm, KVM_ARM_VCPU_PTRAUTH_ADDRESS) && kvm_vcpu_has_feature(kvm, KVM_ARM_VCPU_PTRAUTH_GENERIC))) res0 |= (HCR_API | HCR_APK); @@ -1034,6 +1051,8 @@ int kvm_init_nv_sysregs(struct kvm_vcpu *vcpu) res0 |= (HCR_TEA | HCR_TERR); if (!kvm_has_feat(kvm, ID_AA64MMFR1_EL1, LO, IMP)) res0 |= HCR_TLOR; + if (!kvm_has_feat(kvm, ID_AA64MMFR1_EL1, VH, IMP)) + res0 |= HCR_E2H; if (!kvm_has_feat(kvm, ID_AA64MMFR4_EL1, E2H0, IMP)) res1 |= HCR_E2H; set_sysreg_masks(kvm, HCR_EL2, res0, res1); @@ -1290,6 +1309,15 @@ int kvm_init_nv_sysregs(struct kvm_vcpu *vcpu) res0 |= GENMASK(11, 8); set_sysreg_masks(kvm, CNTHCTL_EL2, res0, res1); + /* ICH_HCR_EL2 */ + res0 = ICH_HCR_EL2_RES0; + res1 = ICH_HCR_EL2_RES1; + if (!(kvm_vgic_global_state.ich_vtr_el2 & ICH_VTR_EL2_TDS)) + res0 |= ICH_HCR_EL2_TDIR; + /* No GICv4 is presented to the guest */ + res0 |= ICH_HCR_EL2_DVIM | ICH_HCR_EL2_vSGIEOICount; + set_sysreg_masks(kvm, ICH_HCR_EL2, res0, res1); + out: for (enum vcpu_sysreg sr = __SANITISED_REG_START__; sr < NR_SYS_REGS; sr++) (void)__vcpu_sys_reg(vcpu, sr); @@ -1309,4 +1337,8 @@ void check_nested_vcpu_requests(struct kvm_vcpu *vcpu) } write_unlock(&vcpu->kvm->mmu_lock); } + + /* Must be last, as may switch context! */ + if (kvm_check_request(KVM_REQ_GUEST_HYP_IRQ_PENDING, vcpu)) + kvm_inject_nested_irq(vcpu); } |