linux-kernel - Re: [PATCH vhost v4 00/16] vdpa: Add support for vq descriptor mappings

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Message-ID: <CAPpAL=zf=g0dyo4u7iOfmaTV+_voT+yLcx-Dav1ROFnya4aK_Q@mail.gmail.com>
Date:   Tue, 24 Oct 2023 14:45:14 +0800
From:   Lei Yang <leiyang@...hat.com>
To:     Si-Wei Liu <si-wei.liu@...cle.com>
Cc:     Dragos Tatulea <dtatulea@...dia.com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Eugenio Perez Martin <eperezma@...hat.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Parav Pandit <parav@...dia.com>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Subject: Re: [PATCH vhost v4 00/16] vdpa: Add support for vq descriptor mappings

QE tested this series v4 with regression testing on real nic, there
are no new issues.

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


On Fri, Oct 20, 2023 at 7:50 AM Si-Wei Liu <si-wei.liu@...cle.com> wrote:
>
> For patches 05-16:
>
> Reviewed-by: Si-Wei Liu <si-wei.liu@...cle.com>
> Tested-by: Si-Wei Liu <si-wei.liu@...cle.com>
>
> Thanks for the fixes!
>
> On 10/18/2023 10:14 AM, Dragos Tatulea 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.
> >
> > Changes in v4:
> >
> > - Improved the handling of empty iotlbs. See mlx5_vdpa_change_map
> >    section in patch "12/16 vdpa/mlx5: Improve mr upate flow".
> > - Fixed a invalid usage of desc_group_mkey hw vq field when the
> >    capability is not there. See patch
> >    "15/16 vdpa/mlx5: Enable hw support for vq descriptor map".
> >
> > Changes in v3:
> >
> > - dup_iotlb now checks for src == dst case and returns an error.
> > - Renamed iotlb parameter in dup_iotlb to dst.
> > - Removed a redundant check of the asid value.
> > - Fixed a commit message.
> > - mx5_ifc.h patch has been applied to mlx5-vhost tree. When applying
> >    this series please pull from that tree first.
> >
> > Changes in v2:
> >
> > - The "vdpa/mlx5: Enable hw support for vq descriptor mapping" change
> >    was split off into two patches to avoid merge conflicts into the tree
> >    of Linus.
> >
> >    The first patch contains only changes for mlx5_ifc.h. This must be
> >    applied into the mlx5-vdpa tree [1] first. Once this patch is applied
> >    on mlx5-vdpa, the change has to be pulled fom mlx5-vdpa into the vhost
> >    tree and only then the remaining patches can be applied.
> >
> > [0] https://lore.kernel.org/virtualization/1694248959-13369-1-git-send-email-si-wei.liu@oracle.com
> > [1] https://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux.git/log/?h=mlx5-vhost
> >
> > Dragos Tatulea (13):
> >    vdpa/mlx5: Expose descriptor group mkey hw capability
> >    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
> >
> > 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        | 194 ++++++++++++++++-------------
> >   drivers/vdpa/mlx5/core/resources.c |   6 +-
> >   drivers/vdpa/mlx5/net/mlx5_vnet.c  | 105 +++++++++++-----
> >   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, 272 insertions(+), 130 deletions(-)
> >
>