On 2022/11/23 21:04, Yi Liu wrote:
On 2022/11/23 20:59, Jason Gunthorpe wrote:
On Wed, Nov 23, 2022 at 10:44:12AM +0800, Yi Liu wrote:
Hi Jason,
On 2022/11/17 05:05, Jason Gunthorpe wrote:
This series provides an alternative container layer for VFIO implemented
using iommufd. This is optional, if CONFIG_IOMMUFD is not set then it will
not be compiled in.
At this point iommufd can be injected by passing in a iommfd FD to
VFIO_GROUP_SET_CONTAINER which will use the VFIO compat layer in iommufd
to obtain the compat IOAS and then connect up all the VFIO drivers as
appropriate.
This is temporary stopping point, a following series will provide a way to
directly open a VFIO device FD and directly connect it to IOMMUFD using
native ioctls that can expose the IOMMUFD features like hwpt, future
vPASID and dynamic attachment.
This series, in compat mode, has passed all the qemu tests we have
available, including the test suites for the Intel GVT mdev. Aside from
the temporary limitation with P2P memory this is belived to be fully
compatible with VFIO.
This is on github:
https://github.com/jgunthorpe/linux/commits/vfio_iommufd
It requires the iommufd series:
https://lore.kernel.org/r/0-v5-4001c2997bd0+30c-iommufd_jgg@xxxxxxxxxx
gvtg test encountered broken display with below commit in your for-next
branch.
https://git.kernel.org/pub/scm/linux/kernel/git/jgg/iommufd.git/commit/?h=for-next&id=57f62422b6f0477afaddd2fc77a4bb9b94275f42
I noticed there are diffs in drivers/vfio/ and drivers/iommu/iommufd/
between this commit and the last tested commit (37c9e6e44d77a). Seems
to have regression due to the diffs.
Do you have something more to go on? I am checking the diff and not
getting any idea. The above also merges v6.1-rc5 into the tree, is
there a chance rc5 is the gvt problem?
that is possible, I'll let my colleague revert it and try.
after reverting the v6.1-rc5 merge commit, the test is passed. also
tried your latest branch which has v6.1-rc6 merge commit, still observed
blank display. but this time, this issue can be recovered by restarting
gdm. It looks like the regression is not due to iommufd. May due to diff
in gvt and i915 itself. So reported a regression as below link.
https://lists.freedesktop.org/archives/intel-gvt-dev/2022-November/011488.html
--
Regards,
Yi Liu
