KVM: arm64: Mark freed S2 MMUs as invalid

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When freeing an S2 MMU, we free the associated pgd, but omit to
mark the structure as invalid. Subsequently, a call to
kvm_nested_s2_unmap() would pick these invalid S2 MMUs and
pass them down the teardown path.

This ends up with a nasty warning as we try to unmap an unallocated
set of page tables.

Fix this by making the S2 MMU invalid on freeing the pgd by calling
kvm_init_nested_s2_mmu().

Fixes: 4f128f8e1a ("KVM: arm64: nv: Support multiple nested Stage-2 mmu structures")
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20250905072859.211369-1-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

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Marc Zyngier 2025-09-05 08:28:59 +01:00 • committed by Oliver Upton

parent b320789d68

commit 34b8f4aded

1 changed files with 4 additions and 0 deletions

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arch/arm64/kvm/mmu.c

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