KVM: arm64: nv: Respect stage-2 write permssion when setting stage-1 AF

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Naturally, updating the Access Flag in a stage-1 descriptor requires
write permission at stage-2, although this isn't actually enforced in
KVM's software PTW.

Generate a stage-2 permission fault if the stage-1 walk attempts to
update the descriptor and its corresponding stage-2 translation lacks
write permission.

Fixes: bff8aa213d ("KVM: arm64: Implement HW access flag management in stage-1 SW PTW")
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://msgid.link/20260108204230.677172-1-oupton@kernel.org
Signed-off-by: Oliver Upton <oupton@kernel.org>

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Oliver Upton 2026-01-08 12:42:30 -08:00

parent 9cb2c20f06

commit 9e27085c33

1 changed files with 6 additions and 2 deletions

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arch/arm64/kvm/at.c

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