Re: [Xen-devel] [PATCH] libxc: expand cpuid features exposed to PVH guests

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Mon, Jul 28, 2014 at 1:39 PM, Roger Pau Monnà <roger.pau@xxxxxxxxxx> wrote:
> On 28/07/14 16:19, David Vrabel wrote:
>> On 23/07/14 15:12, Roger Pau Monne wrote:
>>> Expand the cpuid features exposed to PVH guests, this includes
>>> exposing PSE, PGE and 1GB pages (which will be masked by the
>>> hypervisor if not supported by the hardware).
>>
>> I'm confused.  Why is PVH using the PV CPUID policy instead of the HVM one?
>
> On PVH guests info.hvm == false, so it falls into the PV cpuid policy.
> I'm not sure however if this is intentional or not.

The original idea was that PVH should be as close to PV as possible;
this was back when we were still hoping to have a "lightweight
container" rather than the full HVM stack.  Since "lightweight" isn't
actually that lightweight, we're sort of moving towards "PVH is HVM
without a device model".

 -George

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