Re: [PATCH RFCv1] virtio: Inherit max bounce buffer size from bus parent if possible

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

On Thu, Jun 11, 2026 at 11:05:35AM -0400, Michael S. Tsirkin wrote:
> > If and where we need to provide guarantees about "this access will
> > really definitely only do this size access and it won't break it
> > apart or anything like that" then we need to either be using compiler
> > atomics or else inline asm.

BTW you meant intrinsics, of course, but speaking of atomics, they do
not work on device ram, or not yet. E.g. kvm does not support them
when exiting to qemu I think (only if emulating within kernel)
and it prints "emulating exchange as write".

We are quite far from "arbitrary access" even on pure device RAM.

-- 
MST