From 2044969f0b27fa67f2b69bc710eaef45998cb6fb Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Tue, 13 Apr 2021 11:55:23 +0200 Subject: virtio-mem: Implement RamDiscardManager interface Let's properly notify when (un)plugging blocks, after discarding memory and before allowing the guest to consume memory. Handle errors from notifiers gracefully (e.g., no remaining VFIO mappings) when plugging, rolling back the change and telling the guest that the VM is busy. One special case to take care of is replaying all notifications after restoring the vmstate. The device starts out with all memory discarded, so after loading the vmstate, we have to notify about all plugged blocks. Acked-by: Michael S. Tsirkin Reviewed-by: Michael S. Tsirkin Cc: Paolo Bonzini Cc: "Michael S. Tsirkin" Cc: Alex Williamson Cc: Dr. David Alan Gilbert Cc: Igor Mammedov Cc: Pankaj Gupta Cc: Peter Xu Cc: Auger Eric Cc: Wei Yang Cc: teawater Cc: Marek Kedzierski Signed-off-by: David Hildenbrand Message-Id: <20210413095531.25603-6-david@redhat.com> Signed-off-by: Eduardo Habkost --- include/hw/virtio/virtio-mem.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include') diff --git a/include/hw/virtio/virtio-mem.h b/include/hw/virtio/virtio-mem.h index 4eeb82d5dd..9a6e348fa2 100644 --- a/include/hw/virtio/virtio-mem.h +++ b/include/hw/virtio/virtio-mem.h @@ -67,6 +67,9 @@ struct VirtIOMEM { /* don't migrate unplugged memory */ NotifierWithReturn precopy_notifier; + + /* listeners to notify on plug/unplug activity. */ + QLIST_HEAD(, RamDiscardListener) rdl_list; }; struct VirtIOMEMClass { -- cgit v1.2.3-55-g7522