Re: [XEN PATCH v7 04/20] docs: add Arm FF-A mediator

[Jens Wiklander <jens.wiklander@xxxxxxxxxx>]

Hi Bertrand,

On Thu, Feb 23, 2023 at 4:10 PM Bertrand Marquis
<Bertrand.Marquis@xxxxxxx> wrote:
>
> Hi Jens,
>
> > On 22 Feb 2023, at 16:33, Jens Wiklander <jens.wiklander@xxxxxxxxxx> wrote:
> >
> > Describes a FF-A version 1.1 [1] mediator to communicate with a Secure
> > Partition in secure world.
> >
> > [1] https://developer.arm.com/documentation/den0077/latest
> > Signed-off-by: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
>
> It is a little bit hard to check what is said here as the limitations
> are probably due to some things done after this patch.
>
> I would suggest to move this patch later in the serie.

OK, I'll put it last then.

Thanks,
Jens

>
> Cheers
> Bertrand
>
> > ---
> > SUPPORT.md               |  7 +++++++
> > docs/man/xl.cfg.5.pod.in | 15 +++++++++++++++
> > 2 files changed, 22 insertions(+)
> >
> > diff --git a/SUPPORT.md b/SUPPORT.md
> > index aa1940e55f09..5e0595419684 100644
> > --- a/SUPPORT.md
> > +++ b/SUPPORT.md
> > @@ -818,6 +818,13 @@ that covers the DMA of the device to be passed through.
> >
> > No support for QEMU backends in a 16K or 64K domain.
> >
> > +### ARM: Firmware Framework for Arm A-profile (FF-A) Mediator
> > +
> > +    Status, Arm64: Tech Preview
> > +
> > +There are still some code paths where a vCPU may hog a pCPU longer than
> > +necessary. The FF-A mediator is not yet implemented for Arm32.
> > +
> > ### ARM: Guest Device Tree support
> >
> >     Status: Supported
> > diff --git a/docs/man/xl.cfg.5.pod.in b/docs/man/xl.cfg.5.pod.in
> > index 024bceeb61b2..ca4fc3e67b0c 100644
> > --- a/docs/man/xl.cfg.5.pod.in
> > +++ b/docs/man/xl.cfg.5.pod.in
> > @@ -1645,6 +1645,21 @@ in OP-TEE.
> >
> > This feature is a B<technology preview>.
> >
> > +=item B<ffa>
> > +
> > +B<Arm only.> Allow a guest to communicate via FF-A with Secure Partitions
> > +(SP), default false.
> > +
> > +Currently is only a small subset of the FF-A specification supported. Just
> > +enough to communicate with OP-TEE. In general only direct messaging and
> > +sharing memory with one SP. More advanced use cases where memory might be
> > +shared or donated to multple SPs is not supported.
> > +
> > +See L<https://developer.arm.com/documentation/den0077/latest> for more
> > +informantion about FF-A.
> > +
> > +This feature is a B<technology preview>.
> > +
> > =back
> >
> > =back
> > --
> > 2.34.1
> >
>