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

[Julien Grall <julien.grall@xxxxxxxxxx>]

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?

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

Regards,

-- 
Julien Grall

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