Working on getting migration for virtio-mem completely right [1] I realized that virtio-balloon with VIRTIO_BALLOON_F_FREE_PAGE_HINT paired with postcopy might be shaky. Actually testing it, I directly found two issues, one of both being far from trivial to fix.
Let's disallow postcopy with "free-page-hint=on". [1] https://lkml.kernel.org/r/20210616162940.28630-1-da...@redhat.com David Hildenbrand (2): migration/postcopy-ram: define type for "struct PostcopyNotifyData" virtio-balloon: disallow postcopy with VIRTIO_BALLOON_F_FREE_PAGE_HINT hw/virtio/vhost-user.c | 2 +- hw/virtio/virtio-balloon.c | 26 ++++++++++++++++++++++++++ include/hw/virtio/virtio-balloon.h | 1 + migration/postcopy-ram.c | 2 +- migration/postcopy-ram.h | 4 ++-- 5 files changed, 31 insertions(+), 4 deletions(-) -- 2.31.1
