Commit d5bbb76f authored by Oliver Upton's avatar Oliver Upton
Browse files

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: default avatarMarc Zyngier <maz@kernel.org>
Tested-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://msgid.link/20251124190158.177318-15-oupton@kernel.org


Signed-off-by: default avatarOliver Upton <oupton@kernel.org>
parent e4c7dfac

arch/arm64/kvm/nested.c

+4 −2
Original line number Diff line number Diff line
@@ -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: