Re: [PATCH RFC] Remove PV superpage support (v1).

[Juergen Gross <jgross@suse.com>]

On 29/01/16 17:46, Jan Beulich wrote:
>>>> On 29.01.16 at 17:26, <konrad.wilk@oracle.com> wrote:
>> On Fri, Jan 29, 2016 at 09:00:15AM -0700, Jan Beulich wrote:
>>>>>> On 29.01.16 at 16:30, <konrad.wilk@oracle.com> wrote:
>>>> I am hoping the maintainers can guide me in how they would like:
>>>>  - Deal with documentation? I removed the allowsuperpage from documentation
>>>>    but perhaps it should just mention deprecated?
>>>
>>> Since you delete the option, deleting it from doc seems fine to me.
>>>
>>>>  - I left put_superpage as put_page_from_l2e calls it - but I can't see
>>>>    how the _PAGE_PSE bit would be set as you won't be able to even
>>>>    put that bit on (after my patch). Perhaps just make it an
>>>>    ASSERT in put_page_from_l2e?
>>>
>>> No, that can't be done. Did you check why it is the way it is
>>> (having to do with the alternative initial P2M placement, which
>>> does use superpages despite the guest itself not being able to
>>> create any)?
>>
>> If I recall - this was done for P2M array when put in a different virtual
>> address space? And this being only the initial domain - would this ..
>> Oh this can be done for normal guests as well I presume?
> 
> Iirc Jürgen enabled this for DomU too not so long ago.

I did. The Xen tools won't use superpages for the p2m array, however.


Juergen

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