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

[Juergen Gross <jgross@xxxxxxxx>]

On 11/05/16 14:48, David Vrabel wrote:
> On 11/05/16 13:21, Jan Beulich wrote:
>>>>> On 11.05.16 at 12:16, <david.vrabel@xxxxxxxxxx> wrote:
>>> On 11/05/16 08:00, Juergen Gross wrote:
>>>> Adding David as he removed _PAGE_IOMAP in kernel 3.18.
>>>
>>> Why don't we get the RW bits correct when making the pteval when we
>>> already have the pfn, instead trying to fix it up afterwards.
>>
>> While it looks like this would help in this specific situation, the next
>> time something is found to access the M2P early, that would need
>> another fix then. I.e. dealing with the underlying more general
>> issue would seem preferable to me.
> 
> I'm more concerned with future regression caused by changes to the
> generic x86 code to (for example) install a different early page fault
> handler.
> 
> Can we fix this specific issue in the way I suggested (avoiding the
> unnecessary m2p lookup entirely) and then discuss the merits of the page
> fault handler approach as a separate topic?

Sure.


Juergen


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