KVM: arm64: vgic: Take a refcount on IRQs referenced by last_lr_irq

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Referencing the last interrupt inserted in an LR is rather fragile, as
this interrupt can vanish if a concurrently unmapped LPI.

Solve this by bumping up the refcount on the interrupt when populating
last_lr_irq, and drop it at vgic_prune_ap_list() time, when LPIs are
being reclaimed.

Fixes: 6da5e537f5 ("KVM: arm64: vgic: Pick EOIcount deactivations from AP-list tail")
Reported-by: Yuchao Zhang <ndaugoing@gmail.com>
Reviewed-by: Fuad Tabba <fuad.tabba@linux.dev>
Tested-by: Fuad Tabba <fuad.tabba@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260929093548.3598547-5-maz@kernel.org
Signed-off-by: Oliver Upton <oupton@kernel.org>

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Marc Zyngier 2026-09-29 10:35:45 +01:00 • committed by Oliver Upton

parent e079ef0b1c

commit 19bc5d79ec

1 changed files with 14 additions and 1 deletions

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arch/arm64/kvm/vgic/vgic.c

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