Re: [Xen-devel] [PATCH v3 04/13] xen/arm: support for guest SGI

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2013-04-26 at 13:12 +0100, Sander Bogaert wrote:
> I've been running crashme ( executing random instructions ) on Xen on
> Arm installed on an Arndale board. I'm using Julien's dom0 and Xen
> branch. The Xen branch wasn't updated in a few days.
> 
> I managed to crash Xen from dom0 userspace:
> (XEN)
> (XEN) ****************************************
> (XEN) Panic on CPU 1:
> (XEN) Unhandled SGI 2 on CPU1
> (XEN) ****************************************
> (XEN)
> (XEN) Reboot in five seconds...
> 
> Tracking this back to the source:
> xen/arch/arm/gic.c:648 static void do_sgi
> xen/arch/arm/gic.c:671 void gic_interrupt
> 
> From what I understood from the source all sgi's except 0 & 1
> would/will cause this panic since they are just not handled.

Do you know how the SGI was triggered, because if guest/dom0 userspace
can trigger an arbitrary SGI then we have big problems!

Julien, does your tree have anything in it which might explain this?

Ian.


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