Re: [Xen-devel] crash on boot with 4.6.1 on fedora 24

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 11.05.16 at 11:57, <JGross@xxxxxxxx> wrote:
> On 11/05/16 09:15, Jan Beulich wrote:
>>>>> On 11.05.16 at 09:00, <JGross@xxxxxxxx> wrote:
>>> Having a Xen specific pte flag seems to be much more intrusive than
>>> having an early boot page fault handler consisting of just one line
>>> being capable to mimic the default handler in just one aspect (see
>>> attached patch - only compile tested).
>> 
>> Well, this simple handler may serve the purpose here, but what's
>> the effect of having it in place on actual #PF (resulting e.g. from
>> a bug somewhere)? I.e. what diagnostic information will be
>> available to the developer in that case, now that the hypervisor
>> won't help out anymore?
> 
> Good point. As fixup_exception() is returning 0 in this case we can
> set the #PF handler to NULL again and retry the failing instruction.
> This will then lead to the same hypervisor handled case as today.

And how would you mean to set the #PF handler to this tiny one
again for the next M2P access? You simply can't have both, I'm afraid.

Jan


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel