Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.36 as permitted sender) client-ip=23.128.96.36;
MIME-Version: 1.0
References: <20230912130132.561193-1-dtatulea@nvidia.com> <CAPpAL=w6KeBG5Ur037GNQa=n_fdoUwrFo+ATsFtX9HbWPHZvsg@mail.gmail.com>
 <CAJaqyWeVjKTPmGWwZ26TgebuzCaN8Z2FmPontHvZauOTQj0brQ@mail.gmail.com> <b223d828-2c08-841f-47fb-7cb072fa5ec9@oracle.com>
In-Reply-To: <b223d828-2c08-841f-47fb-7cb072fa5ec9@oracle.com>
From:   Lei Yang <leiyang@redhat.com>
Date:   Wed, 20 Sep 2023 09:14:14 +0800
Message-ID: <CAPpAL=zwz32gVmXzqEHEe6nZPfuE-GTXHdUa2MF9brpdZWw5+Q@mail.gmail.com>
Subject: Re: [PATCH 00/16] vdpa: Add support for vq descriptor mappings
To:     Si-Wei Liu <si-wei.liu@oracle.com>,
        Eugenio Perez Martin <eperezma@redhat.com>,
        Dragos Tatulea <dtatulea@nvidia.com>
Cc:     Jason Wang <jasowang@redhat.com>,
        "Michael S . Tsirkin" <mst@redhat.com>,
        Saeed Mahameed <saeedm@nvidia.com>,
        virtualization@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org, Parav Pandit <parav@nvidia.com>,
        Xuan Zhuo <xuanzhuo@linux.alibaba.com>, kvm@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Precedence: bulk

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

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


On Fri, Sep 15, 2023 at 2:34=E2=80=AFPM Si-Wei Liu <si-wei.liu@oracle.com> =
wrote:
>
>
>
> On 9/13/2023 9:08 AM, Eugenio Perez Martin wrote:
> > On Wed, Sep 13, 2023 at 3:03=E2=80=AFAM Lei Yang <leiyang@redhat.com> w=
rote:
> >> 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=E2=80=AFPM Dragos Tatulea <dtatulea@nvidi=
a.com> wrote:
> >>> This patch series adds support for vq descriptor table mappings which
> >>> are used to improve vdpa live migration downtime. The improvement com=
es
> >>> from using smaller mappings which take less time to create and destro=
y
> >>> 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-sen=
d-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
> >>>
>