Re: [Xen-devel] [PATCH] x86: adjustments to memory_add()

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 28.08.15 at 16:11, <andrew.cooper3@xxxxxxxxxx> wrote:
> On 28/08/15 14:54, Jan Beulich wrote:
>> The function should clean up after a failed map_pages_to_xen().
>>
>> Sharing the M2P table with Dom0 needs to happen before adding
>> the new pages to the heap.
> 
> Why? Does this not create a race where dom0 can observe the new mfns
> before they are ready to use?

No, observing the MFNs is fine as long as no domain can use them.
The race is the other way around: Not having the M2P in place
when the pages could already be handed out from the allocator is
a problem.

Jan


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