Re: remove the nvlink2 pci_vfio subdriver v2

On Tue, 4 May 2021 15:00:39 +0200
Christoph Hellwig [off-list ref] wrote:

On Tue, May 04, 2021 at 02:59:07PM +0200, Greg Kroah-Hartman wrote:

quoted

quoted

Hi Christoph,

FYI, these uapi changes break build of QEMU.  

What uapi changes?

What exactly breaks?

Why does QEMU require kernel driver stuff?  

Looks like it pull in the uapi struct definitions unconditionally
instead of having a local copy.  We could fix that by just putting
them back, but to me this seems like a rather broken configuration
in qemu when it pulls in headers from the running/installed kernel
without any feature checks before using them.

It is not pulling them from the installed kernel, but from a
development version to get new definitions. Removing things in the
kernel requires workarounds in QEMU until it can remove those things as
well. It is not a dumb update...