Re: [PATCH] SUPPORT.md: add Dom0less as Supported

[Stefano Stabellini <sstabellini@kernel.org>]

On Wed, 14 Jul 2021, Julien Grall wrote:
> Hi Stefano,
> 
> On 14/07/2021 01:39, Stefano Stabellini wrote:
> > Add Dom0less to SUPPORT.md to clarify its support status. The feature is
> > mature enough and small enough to make it security supported.
> > 
> > Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
> > 
> > diff --git a/SUPPORT.md b/SUPPORT.md
> > index 317392d8f3..c777f3da72 100644
> > --- a/SUPPORT.md
> > +++ b/SUPPORT.md
> > @@ -832,6 +832,12 @@ OVMF firmware implements the UEFI boot protocol.
> >         Status, qemu-xen: Supported
> >   +## Dom0less
> > +
> > +Guest creation from the hypervisor at boot without Dom0 intervention.
> > +
> > +    Status, ARM: Supported
> > +
> 
> After XSA-372, we will not scrubbed memory assigned to dom0less DomU when
> bootscrub=on.

Do you mean *before* XSA-372, right? I thought the XSA-372 patches take
care of the problem?


> Do we want to exclude this combination or mention that XSAs will
> not be issued if the domU can read secret from unscrubbed memory?

I could say that if bootscrub=off then we won't issue XSAs for domUs reading
secrets from unscrubbed memory. But it is kind of obvious anyway? I am
happy to add it if you think it is good to clarify.