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arm64: kvm: avoid CONFIG_PGTABLE_LEVELS for runtime levels

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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>
Link: https://lore.kernel.org/r/20240214122845.2033971-84-ardb+git@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Ard Biesheuvel 2024-02-14 13:29:25 +01:00 committed by Catalin Marinas
parent d40900fcb3
commit 95e059b5db
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/kvm/mmu.c
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@ -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;