linux-kernel - Re: [PATCH 00/16] vdpa: Add support for vq descriptor mappings

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Date:   Wed, 20 Sep 2023 09:14:14 +0800
From:   Lei Yang <leiyang@...hat.com>
To:     Si-Wei Liu <si-wei.liu@...cle.com>,
        Eugenio Perez Martin <eperezma@...hat.com>,
        Dragos Tatulea <dtatulea@...dia.com>
Cc:     Jason Wang <jasowang@...hat.com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Parav Pandit <parav@...dia.com>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, kvm@...r.kernel.org
Subject: Re: [PATCH 00/16] vdpa: Add support for vq descriptor mappings

QE tested this series with regression testing on real nic, there are
no new issues.

Tested-by: Lei Yang <leiyang@...hat.com>



On Fri, Sep 15, 2023 at 2:34 PM Si-Wei Liu <si-wei.liu@...cle.com> wrote:
>
>
>
> On 9/13/2023 9:08 AM, Eugenio Perez Martin wrote:
> > On Wed, Sep 13, 2023 at 3:03 AM Lei Yang <leiyang@...hat.com> wrote:
> >> Hi Dragos, Eugenio and Si-Wei
> >>
> >> My name is Lei Yang, a software Quality Engineer from Red Hat.  And
> >> always paying attention to improving the live migration downtime
> >> issues because there are others QE asked about this problem when I
> >> share live migration status  recently. Therefore I would like to test
> >> it in my environment. Before the testing I want to know if there is an
> >> expectation of downtime range based on this series of patches? In
> >> addition, QE also can help do a regression test based on this series
> >> of patches if there is a requirement.
> >>
> > Hi Lei,
> >
> > Thanks for offering the testing bandwidth!
> >
> > I think we can only do regression tests here, as the userland part is
> > still not sent to qemu.
> Right. Regression for now, even QEMU has it, to exercise the relevant
> feature it would need a supporting firmware that is not yet available
> for now. Just stay tuned.
>
> thanks for your patience,
> -Siwei
> >
> >> Regards and thanks
> >> Lei
> >>
> >>
> >> On Tue, Sep 12, 2023 at 9:04 PM Dragos Tatulea <dtatulea@...dia.com> wrote:
> >>> This patch series adds support for vq descriptor table mappings which
> >>> are used to improve vdpa live migration downtime. The improvement comes
> >>> from using smaller mappings which take less time to create and destroy
> >>> in hw.
> >>>
> >>> The first part adds the vdpa core changes from Si-Wei [0].
> >>>
> >>> The second part adds support in mlx5_vdpa:
> >>> - Refactor the mr code to be able to cleanly add descriptor mappings.
> >>> - Add hardware descriptor mr support.
> >>> - Properly update iotlb for cvq during ASID switch.
> >>>
> >>> [0] https://lore.kernel.org/virtualization/1694248959-13369-1-git-send-email-si-wei.liu@oracle.com
> >>>
> >>> Dragos Tatulea (13):
> >>>    vdpa/mlx5: Create helper function for dma mappings
> >>>    vdpa/mlx5: Decouple cvq iotlb handling from hw mapping code
> >>>    vdpa/mlx5: Take cvq iotlb lock during refresh
> >>>    vdpa/mlx5: Collapse "dvq" mr add/delete functions
> >>>    vdpa/mlx5: Rename mr destroy functions
> >>>    vdpa/mlx5: Allow creation/deletion of any given mr struct
> >>>    vdpa/mlx5: Move mr mutex out of mr struct
> >>>    vdpa/mlx5: Improve mr update flow
> >>>    vdpa/mlx5: Introduce mr for vq descriptor
> >>>    vdpa/mlx5: Enable hw support for vq descriptor mapping
> >>>    vdpa/mlx5: Make iotlb helper functions more generic
> >>>    vdpa/mlx5: Update cvq iotlb mapping on ASID change
> >>>    Cover letter: vdpa/mlx5: Add support for vq descriptor mappings
> >>>
> >>> Si-Wei Liu (3):
> >>>    vdpa: introduce dedicated descriptor group for virtqueue
> >>>    vhost-vdpa: introduce descriptor group backend feature
> >>>    vhost-vdpa: uAPI to get dedicated descriptor group id
> >>>
> >>>   drivers/vdpa/mlx5/core/mlx5_vdpa.h |  31 +++--
> >>>   drivers/vdpa/mlx5/core/mr.c        | 191 ++++++++++++++++-------------
> >>>   drivers/vdpa/mlx5/core/resources.c |   6 +-
> >>>   drivers/vdpa/mlx5/net/mlx5_vnet.c  | 100 ++++++++++-----
> >>>   drivers/vhost/vdpa.c               |  27 ++++
> >>>   include/linux/mlx5/mlx5_ifc.h      |   8 +-
> >>>   include/linux/mlx5/mlx5_ifc_vdpa.h |   7 +-
> >>>   include/linux/vdpa.h               |  11 ++
> >>>   include/uapi/linux/vhost.h         |   8 ++
> >>>   include/uapi/linux/vhost_types.h   |   5 +
> >>>   10 files changed, 264 insertions(+), 130 deletions(-)
> >>>
> >>> --
> >>> 2.41.0
> >>>
>