On Wed, Apr 19, 2023 at 06:29:40PM +0800, Zhenzhong Duan wrote: > On x86, there are two notifiers registered due to vtd-ir memory > region splitting the entire address space. During replay of the > address space for each notifier, the whole address space is > scanned which is unnecessary. We only need to scan the space > belong to notifier monitored space. > > While on x86 IOMMU memory region spans over entire address space, > but on some other platforms(e.g. arm mps3-an547), IOMMU memory > region is only a window in the entire address space. User could > register a notifier with arbitrary scope beyond IOMMU memory > region. Though in current implementation replay is only triggered > by VFIO and dirty page sync with notifiers derived from memory > region section, but this isn't guaranteed in the future. > > So, we replay the intersection part of IOMMU memory region and > notifier's scope in memory_region_iommu_replay(). Update doc > comment to match this change. > > Signed-off-by: Zhenzhong Duan <zhenzhong.d...@intel.com>
Reviewed-by: Peter Xu <pet...@redhat.com> -- Peter Xu
