On 05/07/2022 13:43, Jan Beulich wrote:
From: Roger Pau Monné <roger....@citrix.com>The loop in iommu_{,un}map() can be arbitrary large, and as such it needs to handle preemption. Introduce a new flag that signals whether the function should do preemption checks, returning the number of pages that have been processed in case a need for preemption was actually found. Note that the cleanup done in iommu_map() can now be incomplete if preemption has happened, and hence callers would need to take care of unmapping the whole range (ie: ranges already mapped by previously preempted calls). So far none of the callers care about having those ranges unmapped, so error handling in arch_iommu_hwdom_init() can be kept as-is. Note that iommu_legacy_{un,}map() are left without preemption handling: callers of those interfaces aren't going to modified to pass bigger chunks, and hence the functions won't be modified as they are legacy and uses should be replaced with iommu_{un,}map() instead if preemption is required. Signed-off-by: Roger Pau Monné <roger....@citrix.com> Signed-off-by: Jan Beulich <jbeul...@suse.com>
Reviewed-by: Paul Durrant <p...@xen.org>
