diff mbox series

[v8,39/43] arm64: kvm: avoid CONFIG_PGTABLE_LEVELS for runtime levels

Message ID 20240214122845.2033971-84-ardb+git@google.com (mailing list archive)
State New, archived
Headers show
Series arm64: Add support for LPA2 and WXN at stage 1 | expand

Commit Message

Ard Biesheuvel Feb. 14, 2024, 12:29 p.m. UTC 
From: Ard Biesheuvel <ardb@kernel.org>

get_user_mapping_size() uses vabits_actual and CONFIG_PGTABLE_LEVELS to
provide the starting point for a table walk. This is fine for LVA, as
the number of translation levels is the same regardless of whether LVA
is enabled. However, with LPA2, this will no longer be the case, so
let's derive the number of levels from the number of VA bits directly.

Acked-by: Marc Zyngier <maz@kernel.org>
Acked-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/arm64/kvm/mmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 6fa9e816df40..cd9456a03e38 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -805,7 +805,7 @@  static int get_user_mapping_size(struct kvm *kvm, u64 addr)
 		.pgd		= (kvm_pteref_t)kvm->mm->pgd,
 		.ia_bits	= vabits_actual,
 		.start_level	= (KVM_PGTABLE_LAST_LEVEL -
-				   CONFIG_PGTABLE_LEVELS + 1),
+				   ARM64_HW_PGTABLE_LEVELS(pgt.ia_bits) + 1),
 		.mm_ops		= &kvm_user_mm_ops,
 	};
 	unsigned long flags;