Re: [Xen-devel] Xen-4.4-rc2 - Some Nested Virt testing

["Zhang, Yang Z" <yang.z.zhang@xxxxxxxxx>]

George Dunlap wrote on 2014-01-25:
> On Tue, Jan 21, 2014 at 6:12 PM, Andrew Cooper
> <andrew.cooper3@xxxxxxxxxx> wrote:
>> Hello,
>> 
>> I have been giving nested virt a try, and have my first bug to report.
>> This is still ongoing, and is by no means complete yet.
>> 
>> Setup:
>> Each reference to XenServer is a trunk XenServer based on 4.4-rc2
>> 
>> Single Intel Haswell SDP (Grantley platform):
>> Native hypervisor: XenServer
>> 
>> Two L1 guests:
>>   XenServer (running with EPT)
>>   XenServer (running with shadow)
>> 
>> When attempting to create an L2 EPT HVM domain under an L1 shadow
>> domain, the L1 shadow domain is killed with:
> 
> Is EPT-on-shadow actually meant to work?  I wouldn't be surprised if
> the L2 HAP stuff assumed that L1 was HAP as well.
> 
> In which case, if an L1 guest is started in shadow mode, then EPT
> should not be advertised.

AFAK, EPT-on-shadow is not supported. Shadow-on-shadow is buggy (Actually, I 
never tried it successfully from the first day I start working on nested 
stuff). Shadow-on-EPT and EPT-on-EPT are working in my box. But I recommended 
using EPT on EPT if possible. Because it is really a pain to run L2 guest on 
shadow on shadow mode due to the poor performance.

> 
>  -George


Best regards,
Yang



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