diff options
Diffstat (limited to 'arch/arm64/include/asm/kvm_mmu.h')
| -rw-r--r-- | arch/arm64/include/asm/kvm_mmu.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h index 66d93e320ec8..ae563ebd6aee 100644 --- a/arch/arm64/include/asm/kvm_mmu.h +++ b/arch/arm64/include/asm/kvm_mmu.h @@ -139,6 +139,8 @@ static __always_inline unsigned long __kern_hyp_va(unsigned long v) #define kern_hyp_va(v) ((typeof(v))(__kern_hyp_va((unsigned long)(v)))) +extern u32 __hyp_va_bits; + /* * We currently support using a VM-specified IPA size. For backward * compatibility, the default IPA size is fixed to 40bits. @@ -353,6 +355,40 @@ static inline bool kvm_is_nested_s2_mmu(struct kvm *kvm, struct kvm_s2_mmu *mmu) return &kvm->arch.mmu != mmu; } +static inline void kvm_fault_lock(struct kvm *kvm) +{ + if (is_protected_kvm_enabled()) + write_lock(&kvm->mmu_lock); + else + read_lock(&kvm->mmu_lock); +} + +static inline void kvm_fault_unlock(struct kvm *kvm) +{ + if (is_protected_kvm_enabled()) + write_unlock(&kvm->mmu_lock); + else + read_unlock(&kvm->mmu_lock); +} + +/* + * ARM64 KVM relies on a simple conversion from physaddr to a kernel + * virtual address (KVA) when it does cache maintenance as the CMO + * instructions work on virtual addresses. This is incompatible with + * VM_PFNMAP VMAs which may not have a kernel direct mapping to a + * virtual address. + * + * With S2FWB and CACHE DIC features, KVM need not do cache flushing + * and CMOs are NOP'd. This has the effect of no longer requiring a + * KVA for addresses mapped into the S2. The presence of these features + * are thus necessary to support cacheable S2 mapping of VM_PFNMAP. + */ +static inline bool kvm_supports_cacheable_pfnmap(void) +{ + return cpus_have_final_cap(ARM64_HAS_STAGE2_FWB) && + cpus_have_final_cap(ARM64_HAS_CACHE_DIC); +} + #ifdef CONFIG_PTDUMP_STAGE2_DEBUGFS void kvm_s2_ptdump_create_debugfs(struct kvm *kvm); #else |