As it currently stands, KVM makes use of FEAT_HAFDBS unconditionally. Use of the feature in the rest of the kernel is guarded by an associated Kconfig option. Align KVM with the rest of the kernel and only enable VTCR_HA when ARM64_HW_AFDBM is enabled. This can be helpful for testing changes to the stage-2 access fault path on Armv8.1+ implementations. Signed-off-by: Oliver Upton <oliver.upton@xxxxxxxxx> --- arch/arm64/kvm/hyp/pgtable.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c index 1a3dd9774707..9c651b6d4092 100644 --- a/arch/arm64/kvm/hyp/pgtable.c +++ b/arch/arm64/kvm/hyp/pgtable.c @@ -584,12 +584,14 @@ u64 kvm_get_vtcr(u64 mmfr0, u64 mmfr1, u32 phys_shift) lvls = 2; vtcr |= VTCR_EL2_LVLS_TO_SL0(lvls); +#ifdef CONFIG_ARM64_HW_AFDBM /* * Enable the Hardware Access Flag management, unconditionally * on all CPUs. The features is RES0 on CPUs without the support * and must be ignored by the CPUs. */ vtcr |= VTCR_EL2_HA; +#endif /* CONFIG_ARM64_HW_AFDBM */ /* Set the vmid bits */ vtcr |= (get_vmid_bits(mmfr1) == 16) ? -- 2.38.1.584.g0f3c55d4c2-goog _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
