From d5bbb76f447420681abdcfa4ad32344d11188d00 Mon Sep 17 00:00:00 2001 From: Oliver Upton Date: Mon, 24 Nov 2025 11:01:56 -0800 Subject: [PATCH] KVM: arm64: nv: Expose hardware access flag management to NV guests Everything is in place to update the access flag at S1 and S2. Expose support for the access flag flavor of FEAT_HAFDBS to NV guests. Reviewed-by: Marc Zyngier Tested-by: Marc Zyngier Link: https://msgid.link/20251124190158.177318-15-oupton@kernel.org Signed-off-by: Oliver Upton --- arch/arm64/kvm/nested.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c index 6495442f400af..88d7dfb44410c 100644 --- a/arch/arm64/kvm/nested.c +++ b/arch/arm64/kvm/nested.c @@ -1599,11 +1599,13 @@ u64 limit_nv_id_reg(struct kvm *kvm, u32 reg, u64 val) case SYS_ID_AA64MMFR1_EL1: val &= ~(ID_AA64MMFR1_EL1_CMOW | ID_AA64MMFR1_EL1_nTLBPA | - ID_AA64MMFR1_EL1_ETS | - ID_AA64MMFR1_EL1_HAFDBS); + ID_AA64MMFR1_EL1_ETS); + /* FEAT_E2H0 implies no VHE */ if (test_bit(KVM_ARM_VCPU_HAS_EL2_E2H0, kvm->arch.vcpu_features)) val &= ~ID_AA64MMFR1_EL1_VH; + + val = ID_REG_LIMIT_FIELD_ENUM(val, ID_AA64MMFR1_EL1, HAFDBS, AF); break; case SYS_ID_AA64MMFR2_EL1: -- 2.47.3