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Like the Intel IOMMU driver already does, flush the per-IOVA domain CPU rcache when a CPU goes offline - there's no point in keeping it. Reviewed-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: John Garry <john.garry@huawei.com> Link: https://lore.kernel.org/r/1616675401-151997-2-git-send-email-john.garry@huawei.com Signed-off-by: Joerg Roedel <jroedel@suse.de>