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authorAvihai Horon <avihaih@nvidia.com>2023-06-21 14:12:00 +0300
committerCédric Le Goater <clg@redhat.com>2023-06-30 06:02:51 +0200
commiteda7362af9595a9c6b1f1fefdd94b5ef711c250c (patch)
tree53fe4bd1738e3c95a5d18e58f17bfada5e48692d /hw/m68k
parent6cd1fe11598a304b8d22203365f4fc39172ec9b2 (diff)
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vfio/migration: Add VFIO migration pre-copy support
Pre-copy support allows the VFIO device data to be transferred while the VM is running. This helps to accommodate VFIO devices that have a large amount of data that needs to be transferred, and it can reduce migration downtime. Pre-copy support is optional in VFIO migration protocol v2. Implement pre-copy of VFIO migration protocol v2 and use it for devices that support it. Full description of it can be found in the following Linux commit: 4db52602a607 ("vfio: Extend the device migration protocol with PRE_COPY"). Signed-off-by: Avihai Horon <avihaih@nvidia.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Tested-by: YangHang Liu <yanghliu@redhat.com> Acked-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Cédric Le Goater <clg@redhat.com>
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