Populate bits [56:55] of the leaf entry with the level provided by the guest's S2 translation. Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx> --- arch/arm64/include/asm/kvm_nested.h | 8 ++++++++ arch/arm64/kvm/mmu.c | 6 ++++++ 2 files changed, 14 insertions(+) diff --git a/arch/arm64/include/asm/kvm_nested.h b/arch/arm64/include/asm/kvm_nested.h index 34499c496ae6..36f2cd2c6fdf 100644 --- a/arch/arm64/include/asm/kvm_nested.h +++ b/arch/arm64/include/asm/kvm_nested.h @@ -5,6 +5,8 @@ #include <linux/bitfield.h> #include <linux/kvm_host.h> +#include <asm/kvm_pgtable.h> + static inline bool nested_virt_in_use(const struct kvm_vcpu *vcpu) { return (!__is_defined(__KVM_NVHE_HYPERVISOR__) && @@ -135,4 +137,10 @@ void access_nested_id_reg(struct kvm_vcpu *v, struct sys_reg_params *p, #define KVM_NV_GUEST_MAP_SZ GENMASK_ULL(56, 55) +static inline u64 kvm_encode_nested_level(struct kvm_s2_trans *trans) +{ + return FIELD_PREP(KVM_PGTABLE_PROT_S2_SW1 | KVM_PGTABLE_PROT_S2_SW0, + trans->level); +} + #endif /* __ARM64_KVM_NESTED_H */ diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 5fb13995190e..0994b3264d28 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -920,11 +920,17 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, * Potentially reduce shadow S2 permissions to match the guest's own * S2. For exec faults, we'd only reach this point if the guest * actually allowed it (see kvm_s2_handle_perm_fault). + * + * Also encode the level of the nested translation in the SW bits of + * the PTE/PMD/PUD. This will be retrived on TLB invalidation from + * the guest. */ if (kvm_is_shadow_s2_fault(vcpu)) { writable &= kvm_s2_trans_writable(nested); if (!kvm_s2_trans_readable(nested)) prot &= ~KVM_PGTABLE_PROT_R; + + prot |= kvm_encode_nested_level(nested); } spin_lock(&kvm->mmu_lock); -- 2.29.2