HI Maxime, Thanks.
> -----Original Message----- > From: Maxime Coquelin <[email protected]> > Sent: Friday, July 1, 2022 9:55 PM > To: Pei, Andy <[email protected]>; [email protected] > Cc: Xia, Chenbo <[email protected]>; Xu, Rosen <[email protected]>; > Xiao, QimaiX <[email protected]> > Subject: Re: [PATCH] vhost: fix virtio blk vDPA live migration IO drop > > > > On 6/22/22 09:47, Andy Pei wrote: > > In the virtio blk vDPA live migration use case, before the live > > migration process, QEMU will set call fd to vDPA back-end. QEMU and > > vDPA back-end stand by until live migration starts. > > During live migration process, QEMU sets kick fd and a new call fd. > > However, after the kick fd is set to the vDPA back-end, the vDPA > > back-end configures device and data path starts. The new call fd will > > cause some kind of "re-configuration", this kind of "re-configuration" > > cause IO drop. > > After this patch, vDPA back-end configures device after kick fd and > > call fd are well set and make sure no IO drops. > > This patch only impact virtio blk vDPA device and does not impact net > > device. > > > > Fixes: 7015b6577178 ("vdpa/ifc: add block device SW live-migration") > > > > Signed-off-by: Andy Pei <[email protected]> > > --- > > lib/vhost/vhost_user.c | 15 +++++++++++++++ > > 1 file changed, 15 insertions(+) > > > > Applied to dpdk-next-virtio/main. > > Thanks, > Maxime
