Re: [Xen-devel] [PATCH 08/16] SUPPORT.md: Add x86-specific virtual hardware

[George Dunlap <george.dunlap@xxxxxxxxxx>]

On 11/22/2017 11:11 AM, Jan Beulich wrote:
>>>> On 21.11.17 at 19:02, <george.dunlap@xxxxxxxxxx> wrote:
>> On 11/21/2017 08:39 AM, Jan Beulich wrote:
>>>>>> On 13.11.17 at 16:41, <george.dunlap@xxxxxxxxxx> wrote:
>>>> +### x86/Nested PV
>>>> +
>>>> +    Status, x86 HVM: Tech Preview
>>>> +
>>>> +This means running a Xen hypervisor inside an HVM domain,
>>>> +with support for PV L2 guests only
>>>> +(i.e., hardware virtualization extensions not provided
>>>> +to the guest).
>>>> +
>>>> +This works, but has performance limitations
>>>> +because the L1 dom0 can only access emulated L1 devices.
>>>
>>> So is this explicitly meaning Xen-on-Xen? Xen-on-KVM, for example,
>>> could be considered "nested PV", too. IOW I think it needs to be
>>> spelled out whether this means the host side of things here, the
>>> guest one, or both.
>>
>> Yes, that's true.  But I forget: Can a Xen dom0 use virtio guest
>> drivers?  I'm pretty sure Stefano tried it at some point but I don't
>> remember what the result was.
> 
> I have no idea at all.

I've changed this to "Status, x86 Xen HVM: Tech Preview", and noted
that it may work for other hypervisors but we haven't received
any concrete reports.

 -George

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