From: "Pei, Andy" <andy.pei@intel.com>
To: Maxime Coquelin <maxime.coquelin@redhat.com>,
"dev@dpdk.org" <dev@dpdk.org>
Cc: "Xia, Chenbo" <chenbo.xia@intel.com>,
"Xu, Rosen" <rosen.xu@intel.com>,
"Xiao, QimaiX" <qimaix.xiao@intel.com>
Subject: RE: [PATCH] vhost: fix virtio blk vDPA live migration IO drop
Date: Mon, 4 Jul 2022 02:30:00 +0000 [thread overview]
Message-ID: <DM5PR11MB1739C9B3A22479ECADADAC958FBE9@DM5PR11MB1739.namprd11.prod.outlook.com> (raw)
In-Reply-To: <a061bf27-a9b2-8ece-21cd-022521e94cbb@redhat.com>
HI Maxime,
Thanks.
> -----Original Message-----
> From: Maxime Coquelin <maxime.coquelin@redhat.com>
> Sent: Friday, July 1, 2022 9:55 PM
> To: Pei, Andy <andy.pei@intel.com>; dev@dpdk.org
> Cc: Xia, Chenbo <chenbo.xia@intel.com>; Xu, Rosen <rosen.xu@intel.com>;
> Xiao, QimaiX <qimaix.xiao@intel.com>
> 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 <andy.pei@intel.com>
> > ---
> > lib/vhost/vhost_user.c | 15 +++++++++++++++
> > 1 file changed, 15 insertions(+)
> >
>
> Applied to dpdk-next-virtio/main.
>
> Thanks,
> Maxime
prev parent reply other threads:[~2022-07-04 2:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-22 7:47 Andy Pei
2022-07-01 12:02 ` Maxime Coquelin
2022-07-01 13:55 ` Maxime Coquelin
2022-07-04 2:30 ` Pei, Andy [this message]
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