Re: [dpdk-dev] [PATCH] vhost: postpone ring addresses translations at kick time only

["Yao, Lei A" <lei.a.yao@intel.com>]

Hi, Maxime

> -----Original Message-----
> From: Maxime Coquelin [mailto:maxime.coquelin@redhat.com]
> Sent: Friday, November 3, 2017 11:57 PM
> To: dev@dpdk.org; yliu@fridaylinux.org; Yao, Lei A <lei.a.yao@intel.com>
> Cc: mst@redhat.com
> Subject: Re: [PATCH] vhost: postpone ring addresses translations at kick time
> only
> 
> Hi Lei,
> 
> On 11/03/2017 04:52 PM, Maxime Coquelin wrote:
> > If multiple queue pairs are created but all are not used, the
> > device is never started, as unused queues aren't enabled and
> > their ring addresses aren't translated. The device is changed
> > to running state when all rings addresses are translated.
> >
> > This patch fixes this by postponning rings addresses translation
> > at kick time unconditionnaly, VHOST_USER_F_PROTOCOL_FEATURES
> > being negotiated or not.
> >
> > Reported-by: Lei Yao<lei.a.yao@intel.com>
> > Signed-off-by: Maxime Coquelin<maxime.coquelin@redhat.com>
> > ---
> >   lib/librte_vhost/vhost_user.c | 33 ++++++++-------------------------
> >   1 file changed, 8 insertions(+), 25 deletions(-)
> 
> Could you confirm the patch fixes the issue on your side?
> 
> I tested below cases with and without IOMMU:
> - Host DPDK queues = 1 / QEMU queues = 1 / Guest DPDK queues = 1
> - Host DPDK queues = 2 / QEMU queues = 2 / Guest DPDK queues = 1
> - Host DPDK queues = 2 / QEMU queues = 2 / Guest DPDK queues = 2
> 
> Thanks,
> Maxime


Thanks for your patch. I test my test cases with your patch based on v17.11-rc2,
It can fix my issue here. 

BRs
Lei