From: Jason Wang <jasowang@redhat.com>
To: Stefan Hajnoczi <stefanha@gmail.com>,
"Avi Cohen (A)" <avi.cohen@huawei.com>
Cc: Wei Wang <wei.w.wang@intel.com>,
Stefan Hajnoczi <stefanha@redhat.com>,
"virtio-dev@lists.oasis-open.org"
<virtio-dev@lists.oasis-open.org>,
"mst@redhat.com" <mst@redhat.com>,
"Yang, Zhiyong" <zhiyong.yang@intel.com>,
"jan.kiszka@siemens.com" <jan.kiszka@siemens.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
"marcandre.lureau@redhat.com" <marcandre.lureau@redhat.com>,
"pbonzini@redhat.com" <pbonzini@redhat.com>
Subject: Re: [Qemu-devel] [virtio-dev] [PATCH v3 0/7] Vhost-pci for inter-VM communication
Date: Thu, 7 Dec 2017 16:31:27 +0800 [thread overview]
Message-ID: <ed3c3bb2-acc9-b44e-2a5b-7f4f22c2230a@redhat.com> (raw)
In-Reply-To: <CAJSP0QVSOsPXYTyjCsBbUmzivjtYbC7xKpU2m7dQbAPMhrcLnA@mail.gmail.com>
On 2017年12月07日 16:04, Stefan Hajnoczi wrote:
> On Thu, Dec 7, 2017 at 7:54 AM, Avi Cohen (A) <avi.cohen@huawei.com> wrote:
>> There is already a virtio mechanism in which 2 VMs assigned a virtio device , are communicating via a veth pair in the host .
>> KVM just passes a pointer of the page of the writer VM to the reader VM - resulting in excellent performance (no vSwitch in the middle)
>> **Question**: What is the advantage of vhost-pci compared to this ?
> Which mechanism do you mean?
>
> vhost-pci will allow VM-to-VM communication without vmexits when
> polling mode is used. Does the mechanism you are thinking about
> require vmexits?
>
> Stefan
I guess what Avi means is probably veth tap support (RFC) here:
https://www.spinics.net/lists/netdev/msg454040.html
But in fact, we don't need veth at all, by using rx handler trick, we
can easily implement pair mode on TUN/TAP.
Thanks
WARNING: multiple messages have this Message-ID (diff)
From: Jason Wang <jasowang@redhat.com>
To: Stefan Hajnoczi <stefanha@gmail.com>,
"Avi Cohen (A)" <avi.cohen@huawei.com>
Cc: Wei Wang <wei.w.wang@intel.com>,
Stefan Hajnoczi <stefanha@redhat.com>,
"virtio-dev@lists.oasis-open.org"
<virtio-dev@lists.oasis-open.org>,
"mst@redhat.com" <mst@redhat.com>,
"Yang, Zhiyong" <zhiyong.yang@intel.com>,
"jan.kiszka@siemens.com" <jan.kiszka@siemens.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
"marcandre.lureau@redhat.com" <marcandre.lureau@redhat.com>,
"pbonzini@redhat.com" <pbonzini@redhat.com>
Subject: [virtio-dev] Re: [Qemu-devel] [virtio-dev] [PATCH v3 0/7] Vhost-pci for inter-VM communication
Date: Thu, 7 Dec 2017 16:31:27 +0800 [thread overview]
Message-ID: <ed3c3bb2-acc9-b44e-2a5b-7f4f22c2230a@redhat.com> (raw)
In-Reply-To: <CAJSP0QVSOsPXYTyjCsBbUmzivjtYbC7xKpU2m7dQbAPMhrcLnA@mail.gmail.com>
On 2017年12月07日 16:04, Stefan Hajnoczi wrote:
> On Thu, Dec 7, 2017 at 7:54 AM, Avi Cohen (A) <avi.cohen@huawei.com> wrote:
>> There is already a virtio mechanism in which 2 VMs assigned a virtio device , are communicating via a veth pair in the host .
>> KVM just passes a pointer of the page of the writer VM to the reader VM - resulting in excellent performance (no vSwitch in the middle)
>> **Question**: What is the advantage of vhost-pci compared to this ?
> Which mechanism do you mean?
>
> vhost-pci will allow VM-to-VM communication without vmexits when
> polling mode is used. Does the mechanism you are thinking about
> require vmexits?
>
> Stefan
I guess what Avi means is probably veth tap support (RFC) here:
https://www.spinics.net/lists/netdev/msg454040.html
But in fact, we don't need veth at all, by using rx handler trick, we
can easily implement pair mode on TUN/TAP.
Thanks
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next prev parent reply other threads:[~2017-12-07 8:31 UTC|newest]
Thread overview: 170+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-05 3:33 [Qemu-devel] [PATCH v3 0/7] Vhost-pci for inter-VM communication Wei Wang
2017-12-05 3:33 ` [virtio-dev] " Wei Wang
2017-12-05 3:33 ` [Qemu-devel] [PATCH v3 1/7] vhost-user: share the vhost-user protocol related structures Wei Wang
2017-12-05 3:33 ` [virtio-dev] " Wei Wang
2017-12-05 3:33 ` [Qemu-devel] [PATCH v3 2/7] vhost-pci-net: add vhost-pci-net Wei Wang
2017-12-05 3:33 ` [virtio-dev] " Wei Wang
2017-12-05 14:59 ` [Qemu-devel] " Stefan Hajnoczi
2017-12-05 14:59 ` Stefan Hajnoczi
2017-12-05 15:17 ` [Qemu-devel] " Michael S. Tsirkin
2017-12-05 15:17 ` Michael S. Tsirkin
2017-12-05 15:55 ` [Qemu-devel] " Michael S. Tsirkin
2017-12-05 15:55 ` Michael S. Tsirkin
2017-12-05 16:41 ` [Qemu-devel] " Stefan Hajnoczi
2017-12-05 16:41 ` Stefan Hajnoczi
2017-12-05 16:53 ` [Qemu-devel] " Michael S. Tsirkin
2017-12-05 16:53 ` Michael S. Tsirkin
2017-12-05 17:00 ` [Qemu-devel] " Cornelia Huck
2017-12-05 17:00 ` [virtio-dev] " Cornelia Huck
2017-12-05 18:06 ` Michael S. Tsirkin
2017-12-05 18:06 ` [virtio-dev] " Michael S. Tsirkin
2017-12-06 10:17 ` Wei Wang
2017-12-06 10:17 ` Wei Wang
2017-12-06 12:01 ` [Qemu-devel] " Stefan Hajnoczi
2017-12-06 12:01 ` Stefan Hajnoczi
2017-12-05 3:33 ` [Qemu-devel] [PATCH v3 3/7] virtio/virtio-pci.c: add vhost-pci-net-pci Wei Wang
2017-12-05 3:33 ` [virtio-dev] " Wei Wang
2017-12-05 3:33 ` [Qemu-devel] [PATCH v3 4/7] vhost-pci-slave: add vhost-pci slave implementation Wei Wang
2017-12-05 3:33 ` [virtio-dev] " Wei Wang
2017-12-05 15:56 ` [Qemu-devel] " Stefan Hajnoczi
2017-12-05 15:56 ` [virtio-dev] " Stefan Hajnoczi
2017-12-14 17:30 ` [Qemu-devel] " Stefan Hajnoczi
2017-12-14 17:30 ` [virtio-dev] " Stefan Hajnoczi
2017-12-14 17:48 ` [Qemu-devel] " Stefan Hajnoczi
2017-12-14 17:48 ` [virtio-dev] " Stefan Hajnoczi
2017-12-05 3:33 ` [Qemu-devel] [PATCH v3 5/7] vhost-user: VHOST_USER_SET_VHOST_PCI msg Wei Wang
2017-12-05 3:33 ` [virtio-dev] " Wei Wang
2017-12-05 16:00 ` [Qemu-devel] " Stefan Hajnoczi
2017-12-05 16:00 ` [virtio-dev] " Stefan Hajnoczi
2017-12-06 10:32 ` [Qemu-devel] " Wei Wang
2017-12-06 10:32 ` Wei Wang
2017-12-15 12:40 ` [Qemu-devel] " Stefan Hajnoczi
2017-12-15 12:40 ` Stefan Hajnoczi
2017-12-05 3:33 ` [Qemu-devel] [PATCH v3 6/7] vhost-pci-slave: handle VHOST_USER_SET_VHOST_PCI Wei Wang
2017-12-05 3:33 ` [virtio-dev] " Wei Wang
2017-12-05 3:33 ` [Qemu-devel] [PATCH v3 7/7] virtio/vhost.c: vhost-pci needs remote gpa Wei Wang
2017-12-05 3:33 ` [virtio-dev] " Wei Wang
2017-12-05 16:05 ` [Qemu-devel] " Stefan Hajnoczi
2017-12-05 16:05 ` [virtio-dev] " Stefan Hajnoczi
2017-12-06 10:46 ` [Qemu-devel] " Wei Wang
2017-12-06 10:46 ` Wei Wang
2017-12-05 4:13 ` [Qemu-devel] [PATCH v3 0/7] Vhost-pci for inter-VM communication no-reply
2017-12-05 7:01 ` [Qemu-devel] [virtio-dev] " Jason Wang
2017-12-05 7:01 ` Jason Wang
2017-12-05 7:15 ` [Qemu-devel] " Wei Wang
2017-12-05 7:15 ` Wei Wang
2017-12-05 7:19 ` [Qemu-devel] " Jason Wang
2017-12-05 7:19 ` Jason Wang
2017-12-05 8:49 ` [Qemu-devel] " Avi Cohen (A)
2017-12-05 8:49 ` Avi Cohen (A)
2017-12-05 10:36 ` [Qemu-devel] " Wei Wang
2017-12-05 10:36 ` Wei Wang
2017-12-05 14:30 ` [Qemu-devel] " Stefan Hajnoczi
2017-12-05 14:30 ` Stefan Hajnoczi
2017-12-05 15:20 ` [Qemu-devel] " Michael S. Tsirkin
2017-12-05 15:20 ` [virtio-dev] " Michael S. Tsirkin
2017-12-05 16:06 ` [Qemu-devel] [virtio-dev] " Stefan Hajnoczi
2017-12-05 16:06 ` Stefan Hajnoczi
2017-12-06 13:49 ` [Qemu-devel] " Stefan Hajnoczi
2017-12-06 13:49 ` Stefan Hajnoczi
2017-12-06 16:09 ` [Qemu-devel] " Wang, Wei W
2017-12-06 16:09 ` Wang, Wei W
2017-12-06 16:27 ` [Qemu-devel] " Stefan Hajnoczi
2017-12-07 3:57 ` Wei Wang
2017-12-07 3:57 ` [virtio-dev] " Wei Wang
2017-12-07 5:11 ` Michael S. Tsirkin
2017-12-07 5:11 ` [virtio-dev] " Michael S. Tsirkin
2017-12-07 5:34 ` Wei Wang
2017-12-07 5:34 ` [virtio-dev] " Wei Wang
2017-12-07 6:31 ` Stefan Hajnoczi
2017-12-07 7:54 ` Avi Cohen (A)
2017-12-07 7:54 ` [virtio-dev] " Avi Cohen (A)
2017-12-07 8:04 ` Stefan Hajnoczi
2017-12-07 8:31 ` Jason Wang [this message]
2017-12-07 8:31 ` [virtio-dev] " Jason Wang
2017-12-07 10:24 ` [Qemu-devel] [virtio-dev] " Stefan Hajnoczi
2017-12-07 10:24 ` [virtio-dev] Re: [Qemu-devel] " Stefan Hajnoczi
2017-12-07 13:33 ` Michael S. Tsirkin
2017-12-07 13:33 ` [virtio-dev] " Michael S. Tsirkin
2017-12-07 9:02 ` Wei Wang
2017-12-07 9:02 ` [virtio-dev] " Wei Wang
2017-12-07 13:08 ` Stefan Hajnoczi
2017-12-07 14:02 ` Michael S. Tsirkin
2017-12-07 14:02 ` [virtio-dev] " Michael S. Tsirkin
2017-12-07 16:29 ` Stefan Hajnoczi
2017-12-07 16:47 ` Michael S. Tsirkin
2017-12-07 16:47 ` [virtio-dev] " Michael S. Tsirkin
2017-12-07 17:29 ` Stefan Hajnoczi
2017-12-07 17:38 ` Michael S. Tsirkin
2017-12-07 17:38 ` [virtio-dev] " Michael S. Tsirkin
2017-12-07 18:28 ` Stefan Hajnoczi
2017-12-07 23:54 ` Michael S. Tsirkin
2017-12-07 23:54 ` [virtio-dev] " Michael S. Tsirkin
2017-12-08 6:08 ` Stefan Hajnoczi
2017-12-08 14:27 ` Michael S. Tsirkin
2017-12-08 14:27 ` [virtio-dev] " Michael S. Tsirkin
2017-12-08 16:15 ` Stefan Hajnoczi
2017-12-09 16:08 ` Wang, Wei W
2017-12-09 16:08 ` [virtio-dev] " Wang, Wei W
2017-12-08 6:43 ` Wei Wang
2017-12-08 6:43 ` [virtio-dev] " Wei Wang
2017-12-08 8:33 ` Stefan Hajnoczi
2017-12-09 16:23 ` Wang, Wei W
2017-12-09 16:23 ` [virtio-dev] " Wang, Wei W
2017-12-11 11:11 ` Stefan Hajnoczi
2017-12-11 11:11 ` [virtio-dev] " Stefan Hajnoczi
2017-12-11 13:53 ` Wang, Wei W
2017-12-11 13:53 ` [virtio-dev] " Wang, Wei W
2017-12-12 10:14 ` Stefan Hajnoczi
2017-12-12 10:14 ` [virtio-dev] " Stefan Hajnoczi
2017-12-13 8:11 ` Wei Wang
2017-12-13 8:11 ` [virtio-dev] " Wei Wang
2017-12-13 12:35 ` Stefan Hajnoczi
2017-12-13 15:01 ` Michael S. Tsirkin
2017-12-13 15:01 ` [virtio-dev] " Michael S. Tsirkin
2017-12-13 20:08 ` Stefan Hajnoczi
2017-12-13 20:59 ` Michael S. Tsirkin
2017-12-13 20:59 ` [virtio-dev] " Michael S. Tsirkin
2017-12-14 15:06 ` Stefan Hajnoczi
2017-12-14 15:06 ` [virtio-dev] " Stefan Hajnoczi
2017-12-15 10:33 ` Wei Wang
2017-12-15 10:33 ` [virtio-dev] " Wei Wang
2017-12-15 12:37 ` Stefan Hajnoczi
2017-12-15 12:37 ` [virtio-dev] " Stefan Hajnoczi
2017-12-13 21:50 ` Maxime Coquelin
2017-12-13 21:50 ` [virtio-dev] " Maxime Coquelin
2017-12-14 15:46 ` [Qemu-devel] [virtio-dev] " Stefan Hajnoczi
2017-12-14 15:46 ` [virtio-dev] Re: [Qemu-devel] " Stefan Hajnoczi
2017-12-14 16:27 ` [Qemu-devel] [virtio-dev] " Michael S. Tsirkin
2017-12-14 16:27 ` [virtio-dev] Re: [Qemu-devel] " Michael S. Tsirkin
2017-12-14 16:39 ` [Qemu-devel] [virtio-dev] " Maxime Coquelin
2017-12-14 16:39 ` [virtio-dev] Re: [Qemu-devel] " Maxime Coquelin
2017-12-14 16:40 ` [Qemu-devel] [virtio-dev] " Michael S. Tsirkin
2017-12-14 16:40 ` [virtio-dev] Re: [Qemu-devel] " Michael S. Tsirkin
2017-12-14 16:50 ` [Qemu-devel] [virtio-dev] " Maxime Coquelin
2017-12-14 16:50 ` [virtio-dev] Re: [Qemu-devel] " Maxime Coquelin
2017-12-14 18:11 ` [Qemu-devel] [virtio-dev] " Stefan Hajnoczi
2017-12-14 18:11 ` [virtio-dev] Re: [Qemu-devel] " Stefan Hajnoczi
2017-12-14 5:53 ` Wei Wang
2017-12-14 5:53 ` [virtio-dev] " Wei Wang
2017-12-14 17:32 ` Stefan Hajnoczi
2017-12-14 17:32 ` [virtio-dev] " Stefan Hajnoczi
2017-12-15 9:10 ` Wei Wang
2017-12-15 9:10 ` [virtio-dev] " Wei Wang
2017-12-15 12:26 ` Stefan Hajnoczi
2017-12-15 12:26 ` [virtio-dev] " Stefan Hajnoczi
2017-12-14 18:04 ` Stefan Hajnoczi
2017-12-14 18:04 ` [virtio-dev] " Stefan Hajnoczi
2017-12-15 10:33 ` [Qemu-devel] [virtio-dev] " Wei Wang
2017-12-15 10:33 ` [virtio-dev] Re: [Qemu-devel] " Wei Wang
2017-12-15 12:00 ` [Qemu-devel] [virtio-dev] " Stefan Hajnoczi
2017-12-15 12:00 ` [virtio-dev] Re: [Qemu-devel] " Stefan Hajnoczi
2017-12-06 16:13 ` Stefan Hajnoczi
2017-12-19 11:35 ` Stefan Hajnoczi
2017-12-19 11:35 ` Stefan Hajnoczi
2017-12-19 14:56 ` [Qemu-devel] " Michael S. Tsirkin
2017-12-19 14:56 ` Michael S. Tsirkin
2017-12-19 17:05 ` [Qemu-devel] " Stefan Hajnoczi
2017-12-20 4:06 ` Michael S. Tsirkin
2017-12-20 4:06 ` [virtio-dev] " Michael S. Tsirkin
2017-12-20 6:26 ` Stefan Hajnoczi
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