Re: [Intel-gfx] [PATCH v12 07/24] vfio: Block device access via device fd until device is opened

Alex Williamson
2023-06-13T17:31:52Z

On Tue, 13 Jun 2023 14:19:17 -0300
Jason Gunthorpe <jgg@nvidia.com> wrote:

> On Tue, Jun 13, 2023 at 08:16:47AM -0600, Alex Williamson wrote:
>
> > > Not quite get why bit field is going to be incompatible with smp
> > > lockless operations. Could you elaborate a bit? And should I define
> > > the access_granted as u8 or "u8:1"?
> >
> > Perhaps FUD on my part, but load-acquire type operations have specific
> > semantics and it's not clear to me that they interest with compiler
> > generated bit operations. Thanks,
>
> They won't compile if you target bit ops, you can't take the address
> of a bitfield.

Yup, that's what I was assuming but was too lazy to prove it. Thanks,

Alex