From: Jason Wang <jasowang@redhat.com>
To: Wu Zongyong <wuzongyong@linux.alibaba.com>
Cc: virtualization <virtualization@lists.linux-foundation.org>,
linux-kernel <linux-kernel@vger.kernel.org>, mst <mst@redhat.com>,
wei.yang1@linux.alibaba.com
Subject: Re: [PATCH 0/6] vDPA driver for legacy virtio-pci device
Date: Thu, 9 Sep 2021 11:20:16 +0800 [thread overview]
Message-ID: <CACGkMEthdFC2oVOC1AmY13mjZs4B0JxEJc5Pk3jN44waNePH2A@mail.gmail.com> (raw)
In-Reply-To: <CACGkMEuEwbDQUtYHz=0O4pQcb6ibY0MAT7hLDjN=Okw8c9CZGA@mail.gmail.com>
On Thu, Sep 9, 2021 at 11:05 AM Jason Wang <jasowang@redhat.com> wrote:
>
> On Wed, Sep 8, 2021 at 8:22 PM Wu Zongyong <wuzongyong@linux.alibaba.com> wrote:
> >
> > This series implements the vDPA driver for legacy virtio-pci device.
> > Currently we already have the vDPA driver for modern virtio-pci device
> > only, but there are some legacy virtio-pci devices conforming to the
> > virtio-pci specifications of 0.9.x or older versions. For example,
> > ENI(Elastic Network Interface) of Alibaba ECS baremetal instance is a
> > hardware virtio network device which follows the Virtio PCI Card 0.9.5
> > Draft specification. Such legacy virtio-pci devices have some
> > inconsistent behaviour with modern virtio-pci devices, so some common
> > codes are split out and modern device specific codes are moved to a
> > separated file.
>
> What worries me a little bit are:
>
> 1) vDPA requires IOMMU_PLATFORM to be supported by the device to work,
> if I understand ENI correctly, it's a legacy device so it can't
> support ACCESS_PLATFORM. Or is it a legacy device that supports
> ACCESS_PLATFORM implicitly.
> 2) vDPA tries to present a 1.0 device, in this case the behavior could
> be ruled by the spec. If we tries to present an 1.0 device on top of
> legacy device we may suffer a lot of issues:
>
> - endian issue: 1.0 use le but legacy may use native endian
> - queue_enable semantic which is missed in the legacy
> - virtqueue size, as you mentioned below
>
> I guess what the device(ENI) supports are:
>
> 1) semantic of ACCESS_PLATFORM without a feature
> 2) little endian
> 3) but a legacy device
>
> So I think it might be better:
>
> 1) introduce the library for legacy as you did in this patch
> 2) having a dedicated ENI vDPA driver
>
> 3) live migration support, though it was not supported by the spec
> yet, but we are working on the support, and we know legacy device can
I meant "can't" actually.
Thanks
> support this.
>
> Thanks
>
> >
> > For legacy devices, it is not supported to negotiate the virtqueue size
> > by the specification. So a new callback get_vq_num_unchangeable is
> > introduced to indicate user not to try change the virtqueue size of the
> > legacy vdpa device. For example, QEMU should not allocate memory for
> > virtqueue according to the properties tx_queue_size and rx_queue_size if
> > we use legacy virtio-pci device as the vhost-vdpa backend. Instead, QEMU
> > should use the new callback get_vq_num_unchangeable first to check if
> > the vdpa device support to change virtqueue size. If not, QEMU should
> > call the callback get_vq_num_max to get the static virtqueue size then
> > allocate the same size memory for the virtqueue.
> >
> > This series have been tested with the ENI in Alibaba ECS baremetal
> > instance.
> >
> > These patches may under consideration, welcome for comments.
> >
> >
> > Wu Zongyong (6):
> > virtio-pci: introduce legacy device module
> > vdpa: fix typo
> > vp_vdpa: add vq irq offloading support
> > vp_vdpa: split out reusable and device specific codes to separate file
> > vdpa: add get_vq_num_unchangeable callback in vdpa_config_ops
> > vp_vdpa: introduce legacy virtio pci driver
> >
> > drivers/vdpa/Kconfig | 7 +
> > drivers/vdpa/virtio_pci/Makefile | 3 +
> > drivers/vdpa/virtio_pci/vp_vdpa.c | 8 +
> > drivers/vdpa/virtio_pci/vp_vdpa_common.c | 220 ++++++++++++++
> > drivers/vdpa/virtio_pci/vp_vdpa_common.h | 67 +++++
> > drivers/vdpa/virtio_pci/vp_vdpa_legacy.c | 346 +++++++++++++++++++++++
> > drivers/vdpa/virtio_pci/vp_vdpa_modern.c | 327 +++++++++++++++++++++
> > drivers/vhost/vdpa.c | 19 ++
> > drivers/virtio/Kconfig | 10 +
> > drivers/virtio/Makefile | 1 +
> > drivers/virtio/virtio_pci_common.c | 10 +-
> > drivers/virtio/virtio_pci_common.h | 9 +-
> > drivers/virtio/virtio_pci_legacy.c | 101 ++-----
> > drivers/virtio/virtio_pci_legacy_dev.c | 220 ++++++++++++++
> > drivers/virtio/virtio_vdpa.c | 5 +-
> > include/linux/vdpa.h | 6 +-
> > include/linux/virtio_pci_legacy.h | 44 +++
> > include/uapi/linux/vhost.h | 2 +
> > 18 files changed, 1320 insertions(+), 85 deletions(-)
> > create mode 100644 drivers/vdpa/virtio_pci/vp_vdpa_common.c
> > create mode 100644 drivers/vdpa/virtio_pci/vp_vdpa_common.h
> > create mode 100644 drivers/vdpa/virtio_pci/vp_vdpa_legacy.c
> > create mode 100644 drivers/vdpa/virtio_pci/vp_vdpa_modern.c
> > create mode 100644 drivers/virtio/virtio_pci_legacy_dev.c
> > create mode 100644 include/linux/virtio_pci_legacy.h
> >
> > --
> > 2.31.1
> >
next prev parent reply other threads:[~2021-09-09 3:21 UTC|newest]
Thread overview: 151+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-08 12:20 [PATCH 0/6] vDPA driver for legacy virtio-pci device Wu Zongyong
2021-09-08 12:20 ` [PATCH 1/6] virtio-pci: introduce legacy device module Wu Zongyong
2021-09-08 12:20 ` [PATCH 2/6] vdpa: fix typo Wu Zongyong
2021-09-08 12:20 ` [PATCH 3/6] vp_vdpa: add vq irq offloading support Wu Zongyong
2021-09-09 2:53 ` Jason Wang
2021-09-08 12:20 ` [PATCH 4/6] vp_vdpa: split out reusable and device specific codes to separate file Wu Zongyong
2021-09-08 12:20 ` [PATCH 5/6] vdpa: add get_vq_num_unchangeable callback in vdpa_config_ops Wu Zongyong
2021-09-09 2:55 ` Jason Wang
2021-09-09 8:01 ` Wu Zongyong
2021-09-09 9:28 ` Jason Wang
2021-09-09 9:57 ` Wu Zongyong
2021-09-10 1:45 ` Jason Wang
2021-09-10 7:32 ` Wu Zongyong
2021-09-10 8:25 ` Cindy Lu
2021-09-10 9:20 ` Wu Zongyong
2021-09-10 15:10 ` Cindy Lu
2021-09-13 1:43 ` Jason Wang
2021-09-13 2:59 ` Wu Zongyong
2021-09-13 3:13 ` Jason Wang
2021-09-13 6:22 ` Cindy Lu
2021-09-09 9:18 ` Michael S. Tsirkin
2021-09-09 9:32 ` Jason Wang
2021-09-08 12:20 ` [PATCH 6/6] vp_vdpa: introduce legacy virtio pci driver Wu Zongyong
2021-09-09 13:57 ` Michael S. Tsirkin
2021-09-10 2:28 ` Wu Zongyong
2021-09-10 9:57 ` Michael S. Tsirkin
2021-09-10 10:01 ` Wu Zongyong
2021-10-22 9:37 ` Michael S. Tsirkin
2021-09-09 3:05 ` [PATCH 0/6] vDPA driver for legacy virtio-pci device Jason Wang
2021-09-09 3:20 ` Jason Wang [this message]
2021-09-09 8:12 ` Wu Zongyong
2021-09-09 9:29 ` Jason Wang
2021-09-09 9:21 ` Michael S. Tsirkin
2021-09-09 9:31 ` Jason Wang
2021-09-09 12:53 ` Wu Zongyong
2021-09-10 1:44 ` Jason Wang
2021-09-14 12:24 ` [PATCH v2 0/5] vDPA driver for Alibaba ENI Wu Zongyong
2021-09-14 12:24 ` Wu Zongyong
2021-09-14 12:24 ` [PATCH v2 1/5] virtio-pci: introduce legacy device module Wu Zongyong
2021-09-14 22:37 ` Randy Dunlap
2021-09-14 12:24 ` [PATCH v2 2/5] vdpa: fix typo Wu Zongyong
2021-09-15 3:15 ` Jason Wang
2021-09-14 12:24 ` [PATCH v2 3/5] vp_vdpa: add vq irq offloading support Wu Zongyong
2021-09-15 3:16 ` Jason Wang
2021-09-15 3:31 ` Wu Zongyong
2021-09-15 4:13 ` Jason Wang
2021-09-14 12:24 ` [PATCH v2 4/5] vdpa: add new vdpa attribute VDPA_ATTR_DEV_F_VERSION_1 Wu Zongyong
2021-09-14 12:58 ` Michael S. Tsirkin
2021-09-15 3:18 ` Jason Wang
2021-09-15 7:38 ` Michael S. Tsirkin
2021-09-15 8:06 ` Jason Wang
2021-09-15 11:08 ` Michael S. Tsirkin
2021-09-15 12:12 ` Wu Zongyong
2021-09-16 1:11 ` Jason Wang
2021-09-16 1:05 ` Jason Wang
2021-09-17 2:34 ` Wu Zongyong
2021-09-17 7:51 ` Jason Wang
2021-09-15 3:24 ` Wu Zongyong
2021-09-15 7:30 ` Michael S. Tsirkin
2021-09-15 8:05 ` Jason Wang
2021-09-15 11:10 ` Michael S. Tsirkin
2021-09-14 12:24 ` [PATCH v2 5/5] eni_vdpa: add vDPA driver for Alibaba ENI Wu Zongyong
2021-09-14 22:35 ` Randy Dunlap
2021-09-15 3:14 ` Jason Wang
2021-09-15 3:47 ` Wu Zongyong
2021-09-15 13:36 ` kernel test robot
2021-09-22 12:46 ` [PATCH v3 0/7] " Wu Zongyong
2021-09-22 12:46 ` [PATCH v3 1/7] virtio-pci: introduce legacy device module Wu Zongyong
2021-09-22 12:46 ` [PATCH v3 2/7] vdpa: fix typo Wu Zongyong
2021-09-22 12:46 ` [PATCH v3 3/7] vp_vdpa: add vq irq offloading support Wu Zongyong
2021-09-22 12:46 ` [PATCH v3 4/7] vdpa: add new callback get_vq_num_min in vdpa_config_ops Wu Zongyong
2021-09-22 12:46 ` [PATCH v3 5/7] virtio_vdpa: setup correct vq size with callbacks get_vq_num_{max,min} Wu Zongyong
2021-09-22 12:46 ` [PATCH v3 6/7] vdpa: add new attribute VDPA_ATTR_DEV_MIN_VQ_SIZE Wu Zongyong
2021-09-22 12:46 ` [PATCH v3 7/7] eni_vdpa: add vDPA driver for Alibaba ENI Wu Zongyong
2021-09-26 2:24 ` Jason Wang
2021-09-26 3:24 ` Wu Zongyong
2021-09-26 4:18 ` Jason Wang
2021-09-27 10:36 ` Michael S. Tsirkin
2021-09-28 2:17 ` Jason Wang
2021-09-26 2:26 ` Jason Wang
2021-09-26 3:27 ` Wu Zongyong
2021-09-26 4:19 ` Jason Wang
2021-09-29 12:54 ` kernel test robot
2021-09-29 6:11 ` [PATCH v4 0/7] " Wu Zongyong
2021-09-29 6:11 ` [PATCH v4 1/7] virtio-pci: introduce legacy device module Wu Zongyong
2021-10-11 3:00 ` Jason Wang
2021-10-11 3:02 ` Jason Wang
2021-09-29 6:11 ` [PATCH v4 2/7] vdpa: fix typo Wu Zongyong
2021-10-11 3:03 ` Jason Wang
2021-09-29 6:11 ` [PATCH v4 3/7] vp_vdpa: add vq irq offloading support Wu Zongyong
2021-09-29 6:11 ` [PATCH v4 4/7] vdpa: add new callback get_vq_num_min in vdpa_config_ops Wu Zongyong
2021-10-11 3:04 ` Jason Wang
2021-09-29 6:11 ` [PATCH v4 5/7] virtio_vdpa: setup correct vq size with callbacks get_vq_num_{max,min} Wu Zongyong
2021-10-11 3:06 ` Jason Wang
2021-09-29 6:11 ` [PATCH v4 6/7] vdpa: add new attribute VDPA_ATTR_DEV_MIN_VQ_SIZE Wu Zongyong
2021-10-11 3:10 ` Jason Wang
2021-09-29 6:11 ` [PATCH v4 7/7] eni_vdpa: add vDPA driver for Alibaba ENI Wu Zongyong
2021-10-11 3:18 ` Jason Wang
2021-10-15 7:14 ` [PATCH v5 0/8] " Wu Zongyong
2021-10-15 7:14 ` [PATCH v5 1/8] virtio-pci: introduce legacy device module Wu Zongyong
2021-10-15 8:22 ` Jason Wang
2021-10-15 7:14 ` [PATCH v5 2/8] vdpa: fix typo Wu Zongyong
2021-10-15 7:14 ` [PATCH v5 3/8] vp_vdpa: add vq irq offloading support Wu Zongyong
2021-10-15 7:14 ` [PATCH v5 4/8] vdpa: add new callback get_vq_num_min in vdpa_config_ops Wu Zongyong
2021-10-15 8:22 ` Jason Wang
2021-10-15 7:14 ` [PATCH v5 5/8] vdpa: min vq num of vdpa device cannot be greater than max vq num Wu Zongyong
2021-10-15 8:24 ` Jason Wang
2021-10-15 7:14 ` [PATCH v5 6/8] virtio_vdpa: setup correct vq size with callbacks get_vq_num_{max,min} Wu Zongyong
2021-10-15 8:30 ` Jason Wang
2021-10-15 7:15 ` [PATCH v5 7/8] vdpa: add new attribute VDPA_ATTR_DEV_MIN_VQ_SIZE Wu Zongyong
2021-10-15 7:15 ` [PATCH v5 8/8] eni_vdpa: add vDPA driver for Alibaba ENI Wu Zongyong
2021-10-15 8:18 ` Jason Wang
2021-10-15 19:13 ` Randy Dunlap
2021-10-22 2:44 ` [PATCH v6 0/8] " Wu Zongyong
2021-10-22 2:44 ` [PATCH v6 1/8] virtio-pci: introduce legacy device module Wu Zongyong
2021-10-25 1:30 ` Jason Wang
2021-10-22 2:44 ` [PATCH v6 2/8] vdpa: fix typo Wu Zongyong
2021-10-22 2:44 ` [PATCH v6 3/8] vp_vdpa: add vq irq offloading support Wu Zongyong
2021-10-22 2:44 ` [PATCH v6 4/8] vdpa: add new callback get_vq_num_min in vdpa_config_ops Wu Zongyong
2021-10-25 2:17 ` Jason Wang
2021-10-22 2:44 ` [PATCH v6 5/8] vdpa: min vq num of vdpa device cannot be greater than max vq num Wu Zongyong
2021-10-25 2:18 ` Jason Wang
2021-10-22 2:44 ` [PATCH v6 6/8] virtio_vdpa: setup correct vq size with callbacks get_vq_num_{max,min} Wu Zongyong
2021-10-25 2:22 ` Jason Wang
[not found] ` <20211025024403.GA3684@L-PF27918B-1352.localdomain>
2021-10-25 4:45 ` Jason Wang
[not found] ` <20211025062454.GA4832@L-PF27918B-1352.localdomain>
2021-10-26 4:46 ` Jason Wang
2021-10-22 2:44 ` [PATCH v6 7/8] vdpa: add new attribute VDPA_ATTR_DEV_MIN_VQ_SIZE Wu Zongyong
2021-10-25 2:23 ` Jason Wang
2021-10-22 2:44 ` [PATCH v6 8/8] eni_vdpa: add vDPA driver for Alibaba ENI Wu Zongyong
2021-10-25 2:27 ` Jason Wang
[not found] ` <20211025032146.GC3684@L-PF27918B-1352.localdomain>
2021-10-25 4:40 ` Jason Wang
2021-10-27 2:47 ` Wu Zongyong
2021-10-27 3:55 ` Jason Wang
2021-10-27 7:04 ` Wu Zongyong
2021-10-29 9:14 ` [PATCH v7 0/9] " Wu Zongyong
2021-10-29 9:14 ` [PATCH v7 1/9] virtio-pci: introduce legacy device module Wu Zongyong
2021-10-29 9:14 ` [PATCH v7 2/9] vdpa: fix typo Wu Zongyong
2021-10-29 9:14 ` [PATCH v7 3/9] vp_vdpa: add vq irq offloading support Wu Zongyong
2021-10-29 9:14 ` [PATCH v7 4/9] vdpa: add new callback get_vq_num_min in vdpa_config_ops Wu Zongyong
2021-10-29 9:14 ` [PATCH v7 5/9] vdpa: min vq num of vdpa device cannot be greater than max vq num Wu Zongyong
2021-10-29 9:14 ` [PATCH v7 6/9] virtio_vdpa: setup correct vq size with callbacks get_vq_num_{max,min} Wu Zongyong
2021-10-29 9:14 ` [PATCH v7 7/9] vdpa: add new attribute VDPA_ATTR_DEV_MIN_VQ_SIZE Wu Zongyong
2021-10-29 9:14 ` [PATCH v7 8/9] eni_vdpa: add vDPA driver for Alibaba ENI Wu Zongyong
2021-10-29 9:14 ` [PATCH v7 9/9] eni_vdpa: alibaba: fix Kconfig typo Wu Zongyong
2021-11-01 8:18 ` Michael S. Tsirkin
2021-11-01 3:31 ` [PATCH v7 0/9] vDPA driver for Alibaba ENI Jason Wang
2021-11-01 6:22 ` Wu Zongyong
2021-11-01 7:02 ` Jason Wang
2021-11-01 8:11 ` Wu Zongyong
2021-11-01 11:12 ` Michael S. Tsirkin
2021-11-01 8:19 ` Michael S. Tsirkin
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