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112 System memory dirty pages tracking
118 dirty tracking module and marks system memory pages which were DMA-ed by the
134 IOMMU support for dirty page tracking. For this reason, all pages are
135 perpetually marked dirty, unless the device driver pins pages through external
136 APIs in which case only those pinned pages are perpetually marked dirty.
138 If the above two methods are not supported, all pages are perpetually marked
141 By default, dirty pages are tracked during pre-copy as well as stop-and-copy
143 phases. Copying dirty pages in pre-copy phase helps QEMU to predict if it can
145 dirty pages continuously, then it understands that even in stop-and-copy phase,
146 it is likely to find dirty pages and can predict the downtime accordingly.
150 off, all dirty pages will be copied to the destination in stop-and-copy phase
153 System memory dirty pages tracking when vIOMMU is enabled
157 phase of migration. In that case, the unmap ioctl returns any dirty pages in
158 that range and QEMU reports corresponding guest physical pages dirty. During
160 pages and then dirty pages bitmap is fetched from VFIO IOMMU modules for those