From: Oliver Upton Date: Mon, 24 Nov 2025 19:01:56 +0000 (-0800) Subject: KVM: arm64: nv: Expose hardware access flag management to NV guests X-Git-Tag: v6.19-rc1~103^2~1^2^2~8 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d5bbb76f447420681abdcfa4ad32344d11188d00;p=thirdparty%2Flinux.git 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 --- 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: