Re: [Xen-devel] [PATCH] libxc: Expose the pdpe1gb cpuid flag to guest

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 17.11.14 at 16:39, <Ian.Jackson@xxxxxxxxxxxxx> wrote:
> Liang Li writes ("[PATCH] libxc: Expose the pdpe1gb cpuid flag to guest"):
>> If hardware support the pdpe1gb flag, expose it to guest by default.
>> Users don't have to use a 'cpuid= ' option in config file to turn
>> it on.
> 
> I don't understand what this flag does.  I guess from the name it
> turns on 1G pages.  I guess these are supported ?
> 
> I would like to see comment from an x86 hypervisor maintainer.

Yes, we support 1Gb pages. The purpose of the patch is to not
unconditionally hide the flag from guests. (I had commented on
v1, but sadly this one wasn't tagged as v2, nor was I included on
the Cc list, hence I didn't spot the new version.)

The one thing I'm not certain about is shadow mode: Only 2Mb
pages may be supported there. Tim?

Jan


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