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 12:25 +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.

Ian.


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