Re: [Xen-devel] [PATCH] xen: arm: fully implement multicall interface.

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2014-04-01 at 11:46 +0100, Julien Grall wrote:
> On 04/01/2014 10:28 AM, Ian Campbell wrote:
> > On Tue, 2014-04-01 at 10:05 +0100, Julien Grall wrote:
> >> Out-of-context, I've noticed that most of trap failure will kill the 
> >> domain. From the ARM ARM , if a coprocessor instruction is failing, we 
> >> should     generate an Undefined Instruction exception (see P.7.5).
> > 
> > You mean HSR_EC_CP15_32, HSR_EC_CP15_64 and HSR_EC_SYSREG?
> > 
> > I've not checked but I think we only ask for traps for things which we
> > are supposed to be able to handle, so anything which is trapped which we
> > can't handle is a bug and would indicate the guest doing something
> > funky.
> 
> Right, but if the emulation of the instruction fails (see
> vtimer_emulate, do_trap_psci,...), Xen will destroy the domain instead
> of sending an UNDEF exception.

My point was that the emulation should never fail...

Ian.




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