Re: Removing __get_user / __put_user for good

["Michael S. Tsirkin" <mst@redhat.com>]

On Mon, Oct 19, 2026 at 09:25:02PM -1000, Linus Torvalds wrote:
> Bah. I made this branch of mine public because I wanted Michael
> Tsirkin to check the vhost part.
> 
> But honestly, the i915 side and the coco/SEV patches are the much more
> interesting ones.
> 
> So this brings in some new victims^Hpeople for that git branch to comment on.
> 
> It's all in
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> uaccess-cleanup
> 
> I haven't dared actually boot it yet.
> 
>                     Linus

vpda seems to survive light testing in a VM for me.

Tested-by: Michael S. Tsirkin <mst@redhat.com>


It's still buggy if there is a swapout right before
the access, just like it was previously, but hey.
One splat less. An improvement.

You might want:

Fixes: 42823a871fd4 ("vringh: support VA with iotlb")

with that, vdpa/vhost bits:

Acked-by: Michael S. Tsirkin <mst@redhat.com>



> On Mon, 19 Oct 2026 at 20:51, Linus Torvalds
> <torvalds@linuxfoundation.org> wrote:
> >
> > I have a whole branch that removes __get_user() and __put_user() entirely.
> >
> > Somebody should check that I did it right. But I didn't want to do the
> > pagefault_disable() around the vringh_notify() part, so it's not quite
> > the same as yours.
> >
> > Let me just push it out. I was going to let it simmer, but your email
> > made me go "I should just let more people look at it".
> >
> > Mind taking a look at the 'uaccess-cleanups' branch?
> >
> > It builds for me. That's all the testing it has gotten so far. Blush.
> >
> >                    Linus