Re: Keystone Issue

[Julien Grall <julien.grall.oss@xxxxxxxxx>]

Hi Marc,

On Tue, 9 Jun 2020 at 18:45, Marc Zyngier <maz@xxxxxxxxxx> wrote:
> > I was wondering if you heard about any potential issue with guest EOI
> > not forwarded to the host. This is on TI Keystone (Cortex A-15).
>
> Not that I know of. A-15 definitely works (TC2, Tegra-K1, Calxeda Midway
> all run just fine with guest EOI), and GIC-400 is a pretty solid piece
> of kit (it is just sloooooow...).
>
> Thinking of it, you would see something like that if the GIC was seeing
> the writes coming from the guest as secure instead of NS (cue the early
> firmware on XGene that exposed the wrong side of GIC-400).

Ah, I remember that one.  We used to carry an hack in Xen [1] for
X-Gene. Thankfully they fixed the firmware!

If it is a similar issue, then the firmware path would definitely be
my preference.

Thank you for the input!

Cheers,

[1] 
http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=50dcb3de603927db2fd87ba09e29c817415aaa44