On 9/13/2023 9:08 AM, Eugenio Perez Martin wrote:
On Wed, Sep 13, 2023 at 3:03 AM Lei Yang <leiyang@xxxxxxxxxx> 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@xxxxxxxxxx> 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@xxxxxxxxxx
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
