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KVM: arm64: Fix block mapping validity check in stage-1 walker

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For the 64K granule size, FEAT_LPA determines whether a level 1 mapping
is allowed. Using the result of has_52bit_pa() is too restrictive, as it
also checks the selected output addressi size in TCR.(I)PS. Fix it by
only checking FEAT_LPA.

Fixes: 5da3a3b27a ("KVM: arm64: Expand valid block mappings to FEAT_LPA/LPA2 support")
Signed-off-by: Wei-Lin Chang <weilin.chang@arm.com>
Link: https://patch.msgid.link/20260605185255.2431996-1-weilin.chang@arm.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Wei-Lin Chang 2026-06-05 19:52:55 +01:00 committed by Marc Zyngier
parent d8839941df
commit 6bef47288c
1 changed files with 4 additions and 1 deletions
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5
arch/arm64/kvm/at.c
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@ -495,15 +495,18 @@ static int walk_s1(struct kvm_vcpu *vcpu, struct s1_walk_info *wi,
/* Block mapping, check the validity of the level */
if (!(desc & BIT(1))) {
bool valid_block = false;
bool lpa = kvm_has_feat_enum(vcpu->kvm, ID_AA64MMFR0_EL1, PARANGE, 52);
switch (BIT(wi->pgshift)) {
case SZ_4K:
valid_block = level == 1 || level == 2 || (wi->pa52bit && level == 0);
break;
case SZ_16K:
case SZ_64K:
valid_block = level == 2 || (wi->pa52bit && level == 1);
break;
case SZ_64K:
valid_block = level == 2 || (lpa && level == 1);
break;
}
if (!valid_block)