From: Jason Wang <jasowang@redhat.com>
To: Eugenio Perez Martin <eperezma@redhat.com>
Cc: Eli Cohen <elic@nvidia.com>, Michael Tsirkin <mst@redhat.com>,
kvm list <kvm@vger.kernel.org>,
virtualization@lists.linux-foundation.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Cindy Lu <lulu@redhat.com>, Eli Cohen <eli@mellanox.com>,
lingshan.zhu@intel.com, Rob Miller <rob.miller@broadcom.com>,
Stefan Hajnoczi <stefanha@redhat.com>,
Stefano Garzarella <sgarzare@redhat.com>
Subject: Re: [PATCH 21/21] vdpasim: control virtqueue support
Date: Mon, 25 Jan 2021 11:16:30 +0800 [thread overview]
Message-ID: <9be0b845-4d59-05fc-5575-347a03c5da52@redhat.com> (raw)
In-Reply-To: <CAJaqyWcRirQgz+n63rU2nYVH2RKqjQfwHGFLzOG=H46qRWuTog@mail.gmail.com>
On 2021/1/23 上午3:43, Eugenio Perez Martin wrote:
> On Tue, Jan 12, 2021 at 4:12 AM Jason Wang <jasowang@redhat.com> wrote:
>>
>> On 2021/1/11 下午8:26, Eli Cohen wrote:
>>> On Wed, Dec 16, 2020 at 02:48:18PM +0800, Jason Wang wrote:
>>>> This patch introduces the control virtqueue support for vDPA
>>>> simulator. This is a requirement for supporting advanced features like
>>>> multiqueue.
>>>>
>>>> A requirement for control virtqueue is to isolate its memory access
>>>> from the rx/tx virtqueues. This is because when using vDPA device
>>>> for VM, the control virqueue is not directly assigned to VM. Userspace
>>>> (Qemu) will present a shadow control virtqueue to control for
>>>> recording the device states.
>>>>
>>>> The isolation is done via the virtqueue groups and ASID support in
>>>> vDPA through vhost-vdpa. The simulator is extended to have:
>>>>
>>>> 1) three virtqueues: RXVQ, TXVQ and CVQ (control virtqueue)
>>>> 2) two virtqueue groups: group 0 contains RXVQ and TXVQ; group 1
>>>> contains CVQ
>>>> 3) two address spaces and the simulator simply implements the address
>>>> spaces by mapping it 1:1 to IOTLB.
>>>>
>>>> For the VM use cases, userspace(Qemu) may set AS 0 to group 0 and AS 1
>>>> to group 1. So we have:
>>>>
>>>> 1) The IOTLB for virtqueue group 0 contains the mappings of guest, so
>>>> RX and TX can be assigned to guest directly.
>>>> 2) The IOTLB for virtqueue group 1 contains the mappings of CVQ which
>>>> is the buffers that allocated and managed by VMM only. So CVQ of
>>>> vhost-vdpa is visible to VMM only. And Guest can not access the CVQ
>>>> of vhost-vdpa.
>>>>
>>>> For the other use cases, since AS 0 is associated to all virtqueue
>>>> groups by default. All virtqueues share the same mapping by default.
>>>>
>>>> To demonstrate the function, VIRITO_NET_F_CTRL_MACADDR is
>>>> implemented in the simulator for the driver to set mac address.
>>>>
>>> Hi Jason,
>>>
>>> is there any version of qemu/libvirt available that I can see the
>>> control virtqueue working in action?
>>
>> Not yet, the qemu part depends on the shadow virtqueue work of Eugenio.
>> But it will work as:
>>
>> 1) qemu will use a separated address space for the control virtqueue
>> (shadow) exposed through vhost-vDPA
>> 2) the commands sent through control virtqueue by guest driver will
>> intercept by qemu
>> 3) Qemu will send those commands to the shadow control virtqueue
>>
>> Eugenio, any ETA for the new version of shadow virtqueue support in Qemu?
>>
> Hi Jason. Sorry for the late response.
>
> For the notification part I have addressed all the issues of the RFC
> [1], except the potential race conditions Stefan pointed, and tested
> with vdpa devices. You can find at
> https://github.com/eugpermar/qemu/tree/vdpa_sw_live_migration.d/notifications.rfc
> . Since the shadow path is activated only through QMP and does not
> interfere with regular operation, I could post to the qemu list if you
> prefer. The series will be smaller if merged in steps.
Sure. Please post them.
>
> Adding the buffer forwarding on top should not take long.
>
> [1] https://lkml.org/lkml/2020/9/23/1243
>
> Thanks!
Thanks
next prev parent reply other threads:[~2021-01-25 3:19 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-16 6:47 [PATCH 00/21] Control VQ support in vDPA Jason Wang
2020-12-16 6:47 ` [PATCH 01/21] vhost: move the backend feature bits to vhost_types.h Jason Wang
2020-12-16 6:47 ` [PATCH 02/21] virtio-vdpa: don't set callback if virtio doesn't need it Jason Wang
2020-12-16 6:48 ` [PATCH 03/21] vhost-vdpa: passing iotlb to IOMMU mapping helpers Jason Wang
2020-12-16 6:48 ` [PATCH 04/21] vhost-vdpa: switch to use vhost-vdpa specific IOTLB Jason Wang
2020-12-16 6:48 ` [PATCH 05/21] vdpa: add the missing comment for nvqs in struct vdpa_device Jason Wang
2020-12-16 6:48 ` [PATCH 06/21] vdpa: introduce virtqueue groups Jason Wang
2021-01-04 10:04 ` Stefan Hajnoczi
2021-01-05 4:13 ` Jason Wang
2020-12-16 6:48 ` [PATCH 07/21] vdpa: multiple address spaces support Jason Wang
2020-12-29 7:28 ` Eli Cohen
2020-12-30 4:00 ` Jason Wang
2020-12-30 4:04 ` Jason Wang
2020-12-30 9:44 ` Eli Cohen
2020-12-16 6:48 ` [PATCH 08/21] vdpa: introduce config operations for associating ASID to a virtqueue group Jason Wang
2020-12-16 6:48 ` [PATCH 09/21] vhost_iotlb: split out IOTLB initialization Jason Wang
2020-12-16 6:48 ` [PATCH 10/21] vhost: support ASID in IOTLB API Jason Wang
2020-12-29 10:20 ` Eli Cohen
2020-12-30 4:27 ` Jason Wang
2020-12-16 6:48 ` [PATCH 11/21] vhost-vdpa: introduce asid based IOTLB Jason Wang
2020-12-29 11:41 ` Eli Cohen
2020-12-30 6:23 ` Jason Wang
2020-12-29 11:53 ` Eli Cohen
2020-12-30 6:34 ` Jason Wang
2020-12-29 12:05 ` Eli Cohen
2020-12-30 6:33 ` Jason Wang
2020-12-16 6:48 ` [PATCH 12/21] vhost-vdpa: introduce uAPI to get the number of virtqueue groups Jason Wang
2020-12-29 12:24 ` Eli Cohen
2020-12-30 6:49 ` Jason Wang
2020-12-30 10:05 ` Eli Cohen
2020-12-31 2:36 ` Jason Wang
2020-12-16 6:48 ` [PATCH 13/21] vhost-vdpa: introduce uAPI to get the number of address spaces Jason Wang
2020-12-16 6:48 ` [PATCH 14/21] vhost-vdpa: uAPI to get virtqueue group id Jason Wang
2020-12-16 6:48 ` [PATCH 15/21] vhost-vdpa: introduce uAPI to set group ASID Jason Wang
2020-12-16 6:48 ` [PATCH 16/21] vhost-vdpa: support ASID based IOTLB API Jason Wang
2020-12-16 6:48 ` [PATCH 17/21] vdpa_sim: split vdpasim_virtqueue's iov field in out_iov and in_iov Jason Wang
2020-12-16 6:48 ` [PATCH 18/21] vdpa_sim: advertise VIRTIO_NET_F_MTU Jason Wang
2020-12-16 6:48 ` [PATCH 19/21] vdpa_sim: factor out buffer completion logic Jason Wang
2020-12-16 6:48 ` [PATCH 20/21] vdpa_sim: filter destination mac address Jason Wang
2020-12-16 6:48 ` [PATCH 21/21] vdpasim: control virtqueue support Jason Wang
2020-12-17 20:19 ` kernel test robot
2021-01-11 12:26 ` Eli Cohen
2021-01-12 3:11 ` Jason Wang
2021-01-22 19:43 ` Eugenio Perez Martin
2021-01-25 3:16 ` Jason Wang [this message]
2020-12-16 9:47 ` [PATCH 00/21] Control VQ support in vDPA Michael S. Tsirkin
2020-12-17 3:30 ` Jason Wang
2020-12-17 7:58 ` Michael S. Tsirkin
2020-12-17 9:02 ` Jason Wang
2020-12-17 22:28 ` Michael S. Tsirkin
2020-12-18 2:56 ` Jason Wang
2020-12-17 7:26 ` Eli Cohen
2022-02-24 21:22 ` [RFC PATCH v2 00/19] " Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 01/19] vhost: move the backend feature bits to vhost_types.h Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 02/19] virtio-vdpa: don't set callback if virtio doesn't need it Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 03/19] vhost-vdpa: passing iotlb to IOMMU mapping helpers Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 04/19] vhost-vdpa: switch to use vhost-vdpa specific IOTLB Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 05/19] vdpa: introduce virtqueue groups Gautam Dawar
2022-02-28 8:07 ` Jason Wang
2022-02-28 10:57 ` Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 06/19] vdpa: multiple address spaces support Gautam Dawar
2022-03-03 19:39 ` Eugenio Perez Martin
2022-03-04 6:30 ` Gautam Dawar
2022-03-04 17:45 ` Eugenio Perez Martin
2022-02-24 21:22 ` [RFC PATCH v2 07/19] vdpa: introduce config operations for associating ASID to a virtqueue group Gautam Dawar
2022-03-04 9:54 ` Eugenio Perez Martin
2022-03-04 17:48 ` Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 08/19] vhost_iotlb: split out IOTLB initialization Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 09/19] vhost: support ASID in IOTLB API Gautam Dawar
2022-03-04 10:25 ` Eugenio Perez Martin
2022-03-04 17:52 ` Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 10/19] vhost-vdpa: introduce asid based IOTLB Gautam Dawar
2022-03-04 17:56 ` Eugenio Perez Martin
2022-03-07 10:07 ` Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 11/19] vhost-vdpa: introduce uAPI to get the number of virtqueue groups Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 12/19] vhost-vdpa: introduce uAPI to get the number of address spaces Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 13/19] vhost-vdpa: uAPI to get virtqueue group id Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 14/19] vhost-vdpa: introduce uAPI to set group ASID Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 15/19] vhost-vdpa: support ASID based IOTLB API Gautam Dawar
2022-03-04 18:04 ` Eugenio Perez Martin
2022-03-07 10:23 ` Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 16/19] vdpa_sim: advertise VIRTIO_NET_F_MTU Gautam Dawar
2022-03-10 17:55 ` Eugenio Perez Martin
2022-02-24 21:22 ` [RFC PATCH v2 17/19] vdpa_sim: factor out buffer completion logic Gautam Dawar
2022-02-24 21:22 ` [RFC PATCH v2 18/19] vdpa_sim: filter destination mac address Gautam Dawar
2022-03-10 18:22 ` Eugenio Perez Martin
2022-02-24 21:22 ` [RFC PATCH v2 19/19] vdpasim: control virtqueue support Gautam Dawar
2022-03-10 18:20 ` Eugenio Perez Martin
2022-03-18 7:35 ` Eugenio Perez Martin
2022-03-22 8:46 ` Gautam Dawar
2022-02-28 8:17 ` [RFC PATCH v2 00/19] Control VQ support in vDPA Jason Wang
2022-02-28 10:56 ` Gautam Dawar
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