[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] xen: arm: fully implement multicall interface.
On 04/01/2014 11:49 AM, Ian Campbell wrote: > 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... The emulation can fail if the guest decides to write on an RO register. -- Julien Grall _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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