On Tue, Nov 09, 2021 at 01:42:29PM +0100, Robert Święcki wrote:

Also, this might be unrelated, but the following happened around this
patch (ie https://github.com/torvalds/linux/commit/0c5c62ddf88c34bc83b66e4ac9beb2bb0e1887d4)

I sometimes run Win11 under qemu/kvm/vfio (gfx card), and it stopped
booting (even with the latest patch for pci). Another Linux distro
boots fine under the same qemu/kvm/vfio, but Win11 stops at the boot
screen.

It worked well with 5.15.0 and a few PRs later - with the git tip it's
not booting - and it works well with 5.15.0-rc7

Maybe related to pci/vfio changes, maybe not, just leaving it here for
track record. I'll try to debug it a bit.

Hmm.  I have no idea how to debug a Win11 boot issue.  Unless there
are clues in the dmesg log or some qemu or kvm logs (if you find any
such logs, please put the complete logs somewhere), the only thing I
can think to do would be bisecting it.  "git bisect" between v5.15 and
0c5c62ddf88c looks like about 13 steps.

Bjorn