Re: [Xen-devel] [PATCH] xen: arm: take FIQ exceptoons to Xen not guest by setting HCR_EL2.FMO

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2014-06-16 at 12:36 +0100, Julien Grall wrote:
> On 06/16/2014 12:28 PM, Ian Campbell wrote:
> > On Mon, 2014-06-16 at 12:25 +0100, Julien Grall wrote:
> >> Hi Ian,
> >>
> >> There is small typo in the commit title:
> >>
> >> s/exceptoons/exceptions/
> > 
> > Spotted, thanks
> > 
> >> On 06/16/2014 11:48 AM, Ian Campbell wrote:
> >>> So far none of the platforms which we support use FIQ for anything, but 
> >>> when we
> >>> end up supporting one it would be far better to surprise Xen with them 
> >>> than
> >>> whatever guest happens to be running...
> >>
> >> May I ask for a reference in the ARM ARM? I can't find any paragraph
> >> stating that the FIQ is taken in guest mode if HCR.EL2.FMO is not set.
> > 
> > That's pretty much the meaning of that bit, it's analogous to
> > HCR_EL2.IMO which does the same for regular interrupts and .AMO which
> > does the same for async aborts.
> 
> AFAIU this bit is firstly use to change the masking of CPSR. My first
> thought was about it. I had to follow multiple link before finding the
> right paragraph about the routing.
> 
> Can you add a reference to B1.8.4?

OK.

> 
> Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>
> 
> Regards,
> 



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