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

[Juergen Gross <jgross@xxxxxxxx>]

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.


Juergen

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