[virtio-dev] vhost-user to interconnect vm's

[virtio-dev] vhost-user to interconnect vm's

[Avi Cohen (A)]

Hello,
I wonder if it is possible to directly connect 2  VM's (without host intervention) with  vhost-user interface , so one VM is slave and the 2nd  is the master.
I can connect the VM's with OVS-DPDK (or VPP)  in the middle - but this requires an extra copy.
Best Regards
Avi

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Re: [virtio-dev] vhost-user to interconnect vm's

[Michael S. Tsirkin]

On Tue, Oct 24, 2017 at 02:07:21PM +0000, Avi Cohen (A) wrote:
> Hello,
> I wonder if it is possible to directly connect 2  VM's (without host intervention) with  vhost-user interface , so one VM is slave and the 2nd  is the master.
> I can connect the VM's with OVS-DPDK (or VPP)  in the middle - but this requires an extra copy.
> Best Regards
> Avi


This is the vhost-pci set of patches. They are not upstream yet -
last version - v2 - was posted back in May. Cc Wei Wang for an
update on the status. It would be great if you could try them out.

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Re: [virtio-dev] vhost-user to interconnect vm's

[Wei Wang]

On 10/25/2017 06:25 AM, Michael S. Tsirkin wrote:
> On Tue, Oct 24, 2017 at 02:07:21PM +0000, Avi Cohen (A) wrote:
>> Hello,
>> I wonder if it is possible to directly connect 2  VM's (without host intervention) with  vhost-user interface , so one VM is slave and the 2nd  is the master.
>> I can connect the VM's with OVS-DPDK (or VPP)  in the middle - but this requires an extra copy.
>> Best Regards
>> Avi
>
> This is the vhost-pci set of patches. They are not upstream yet -
> last version - v2 - was posted back in May. Cc Wei Wang for an
> update on the status. It would be great if you could try them out.


We have started to implement the DPDK PMD of vhost-pci, since
it is simpler and has better performance than the kernel driver.

We are also trying to make a simpler QEMU implementation than v2,
for example, the vhost-pci device will be statically set up via qemu
command line, instead of being hot-plugged on demand.

We would be able to send out the new version in a month or two.

Best,
Wei

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RE: [virtio-dev] vhost-user to interconnect vm's

[Avi Cohen (A)]

Thank you Michael and Wei
What is the estimated time for kernel-driver implementation ?
Best Regards
Avi

> -----Original Message-----
> From: Wei Wang [mailto:wei.w.wang@intel.com]
> Sent: Wednesday, 25 October, 2017 3:48 AM
> To: Michael S. Tsirkin; Avi Cohen (A)
> Cc: virtio-dev@lists.oasis-open.org; Ofer Ben-Yacov; zhiyong.yang@intel.com
> Subject: Re: [virtio-dev] vhost-user to interconnect vm's
> 
> On 10/25/2017 06:25 AM, Michael S. Tsirkin wrote:
> > On Tue, Oct 24, 2017 at 02:07:21PM +0000, Avi Cohen (A) wrote:
> >> Hello,
> >> I wonder if it is possible to directly connect 2  VM's (without host
> intervention) with  vhost-user interface , so one VM is slave and the 2nd  is the
> master.
> >> I can connect the VM's with OVS-DPDK (or VPP)  in the middle - but this
> requires an extra copy.
> >> Best Regards
> >> Avi
> >
> > This is the vhost-pci set of patches. They are not upstream yet - last
> > version - v2 - was posted back in May. Cc Wei Wang for an update on
> > the status. It would be great if you could try them out.
> 
> 
> We have started to implement the DPDK PMD of vhost-pci, since it is simpler
> and has better performance than the kernel driver.
> 
> We are also trying to make a simpler QEMU implementation than v2, for
> example, the vhost-pci device will be statically set up via qemu command line,
> instead of being hot-plugged on demand.
> 
> We would be able to send out the new version in a month or two.
> 
> Best,
> Wei

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Re: [virtio-dev] vhost-user to interconnect vm's

[Wei Wang]

On 10/25/2017 03:34 PM, Avi Cohen (A) wrote:
> Thank you Michael and Wei
> What is the estimated time for kernel-driver implementation ?
> Best Regards
> Avi
>

We have some initial draft kernel driver code for the old design:
driver: https://github.com/wei-w-wang/vhost-pci-driver
device: https://github.com/wei-w-wang/vhost-pci-device

But don't have a plan to continue to work on the kernel driver until the
QEMU part gets upstreammed with dpdk pmd.

Best,
Wei

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RE: [virtio-dev] vhost-user to interconnect vm's

[Wang, Wei W]

On Monday, December 4, 2017 9:38 PM, Avi Cohen (A) wrote:
> 
> Hi Wei,
> Regarding the kernel (not dpdk) mode:
> V1:
> I understand that these (v1) patches should be installed in the guest kernel.
> I don't understand what is the status of the qemu patch for v1 ? where can I
> find it ?
> 
> V2:
> Currently there is no QEMU support - correct ?
> Best Regards
> Avi
> 
> > -----Original Message-----
> > From: Wei Wang [mailto:wei.w.wang@intel.com]
> > Sent: Wednesday, 25 October, 2017 2:48 PM
> > To: Avi Cohen (A); Michael S. Tsirkin
> > Cc: virtio-dev@lists.oasis-open.org; Ofer Ben-Yacov;
> > zhiyong.yang@intel.com
> > Subject: Re: [virtio-dev] vhost-user to interconnect vm's
> >
> > On 10/25/2017 03:34 PM, Avi Cohen (A) wrote:
> > > Thank you Michael and Wei
> > > What is the estimated time for kernel-driver implementation ?
> > > Best Regards
> > > Avi
> > >
> >
> > We have some initial draft kernel driver code for the old design:
> > driver: https://github.com/wei-w-wang/vhost-pci-driver
> > device: https://github.com/wei-w-wang/vhost-pci-device

Hi Avi,

The above links are actually v2 QEMU and the draft guest kernel driver. 

Best,
Wei

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