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

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Date:   Wed, 13 Sep 2023 18:08:47 +0200
From:   Eugenio Perez Martin <eperezma@...hat.com>
To:     Lei Yang <leiyang@...hat.com>
Cc:     Dragos Tatulea <dtatulea@...dia.com>,
        Si-Wei Liu <si-wei.liu@...cle.com>,
        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

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.

> 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
> >
>