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Tsirkin" To: Dragos Tatulea Cc: "linux-rdma@vger.kernel.org" , "xuanzhuo@linux.alibaba.com" , "virtualization@lists.linux-foundation.org" , Gal Pressman , "eperezma@redhat.com" , "linux-kernel@vger.kernel.org" , "netdev@vger.kernel.org" , "jasowang@redhat.com" , "leon@kernel.org" , Saeed Mahameed , "kvm@vger.kernel.org" Subject: Re: [PATCH vhost v2 00/16] vdpa: Add support for vq descriptor mappings Message-ID: <20231005151812-mutt-send-email-mst@kernel.org> References: <20230928164550.980832-2-dtatulea@nvidia.com> <20231005133054-mutt-send-email-mst@kernel.org> <9dfa552011c20a58d8550bd794977de821212df4.camel@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <9dfa552011c20a58d8550bd794977de821212df4.camel@nvidia.com> Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On Thu, Oct 05, 2023 at 05:44:01PM +0000, Dragos Tatulea wrote: > On Thu, 2023-10-05 at 13:31 -0400, Michael S. Tsirkin wrote: > > On Thu, Sep 28, 2023 at 07:45:11PM +0300, 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 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-next tree [1] first. Once this patch is applied > > >   on mlx5-next, the change has to be pulled fom mlx5-next into the vhost > > >   tree and only then the remaining patches can be applied. > > > > > > I get it you plan v3? > There are some very small improvements (commit message in 13/16 and fix in > 16/16) that could make a v3. The latter can be addressed as a separate patch > when moving dup_iotlb to vhost/iotlb. What do you think? if there's a fix by all means post v3. > > > > > [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-next > > > > > > 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        | 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 > > >