KVM: arm64: Restart instruction upon race in __kvm_at_s12()

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__kvm_at_s*() are expected to return -EAGAIN if the page table walk
raced with a concurrent update to a page table descriptor, which is
interpreted as a signal to restart the trapping instruction.

While this mostly works, __kvm_at_s12() silently eats the return from
__kvm_at_s1e01() and consumes an uninitialized PAR value. Propagate the
nonzero return instead.

Fixes: 92c6443222 ("KVM: arm64: Propagate PTW errors up to AT emulation")
Signed-off-by: Oliver Upton <oupton@kernel.org>
Link: https://patch.msgid.link/20260602235450.103057-5-oupton@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>

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Oliver Upton 2026-06-02 16:54:49 -07:00 • committed by Marc Zyngier

parent efa871f4a2

commit 699a2cc7f6

1 changed files with 4 additions and 1 deletions

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arch/arm64/kvm/at.c

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