diff mbox series

[v2,6/6] KVM: arm64: Condition HW AF updates on config option

Message ID 20221202185156.696189-7-oliver.upton@linux.dev
State New
Headers
Series [v2,1/6] KVM: arm64: Use KVM's pte type/helpers in handle_access_fault() |

Commit Message

Oliver Upton Dec. 2, 2022, 6:51 p.m. UTC 
  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@linux.dev>
---
 arch/arm64/kvm/hyp/pgtable.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index 30575b5f5dcd..3d61bd3e591d 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -606,12 +606,14 @@  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) ?