Re: [PATCH v2 4/6] xen_pvdev: Do not assume Dom0 when creating a directory

[Stefano Stabellini]

On Wed, 22 Nov 2023, David Woodhouse wrote:
> On Wed, 2023-11-22 at 14:29 -0800, Stefano Stabellini wrote:
> > On Wed, 22 Nov 2023, Paul Durrant wrote:
> > > On 21/11/2023 22:10, Volodymyr Babchuk wrote:
> > > > From: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
> > > > 
> > > > Instead of forcing the owner to domid 0, use XS_PRESERVE_OWNER to
> > > > inherit the owner of the directory.
> > > 
> > > Ah... so that's why the previous patch is there.
> > > 
> > > This is not the right way to fix it. The QEMU Xen support is *assuming* 
> > > that
> > > QEMU is either running in, or emulating, dom0. In the emulation case this 
> > > is
> > > probably fine, but the 'real Xen' case it should be using the correct 
> > > domid
> > > for node creation. I guess this could either be supplied on the command 
> > > line
> > > or discerned by reading the local domain 'domid' node.
> > 
> > yes, it should be passed as command line option to QEMU
> 
> I'm not sure I like the idea of a command line option for something
> which QEMU could discover for itself.

That's fine too. I meant to say "yes, as far as I know the toolstack
passes the domid to QEMU as a command line option today".