Re: [Xen-devel] Dom0 linux 4.0 + devel/for-linus-4.1 branch: p2m.c:884:d0v0 gfn_to_mfn failed! gfn=ffffffff001ed type:4

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Monday, April 13, 2015, 2:21:21 PM, you wrote:

> On 13/04/15 13:14, Sander Eikelenboom wrote:
>> 
>> Monday, April 13, 2015, 2:07:02 PM, you wrote:
>> 
>>> On 13/04/15 12:21, Sander Eikelenboom wrote:
>>>>
>>>> Monday, April 13, 2015, 11:50:51 AM, you wrote:
>>>>
>>>>> On 13/04/15 10:39, Sander Eikelenboom wrote:
>>>>>> Hi David,
>>>>>>
>>>>>> I seem to have spotted some trouble with a 4.0 dom0 kernel with the 
>>>>>> devel/for-linus-4.1 branch pulled on top.
>>>>>>
>>>>>> Does this remind you of any specific commits in the devel/for-linus-4.1 
>>>>>> branch that could
>>>>>> likely be involved that i could try to revert ?
>>>>
>>>>> Yes.  This will probably be 4e8c0c8c4bf3a (xen/privcmd: improve
>>>>> performance of MMAPBATCH_V2) which makes the kernel try harder to map
>>>>> all GFNs instead of failing on the first one.
>>>>
>>>>> I think this is qemu incorrectly trying to map GFNs.
>>>>
>>>>> David
>>>>
>>>> Reverted that specific one, but still get those messages.
>> 
>>> You'll have to bisect it then.  Because I don't see any other relevant
>>> commits in devel/for-linus-4.1
>> 
>>> David
>> 
>> Ok .. hmm first candidate of the bisect also looks interessting:
>> [628c28eefd6f2cef03b212081b466ae43fd093a3] xen: unify foreign GFN map/unmap 
>> for auto-xlated physmap guests

> Unless your dom0 is PVH, no.

> David

Nope .. but bisect is underway .. so hopefully we will know it soon enough :-)


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