Re: [Xen-devel] [PATCH v2 2/2] x86/hvm: add support for pcommit instruction

["Zhang, Haozhong" <haozhong.zhang@xxxxxxxxx>]

On 01/05/16 15:19, Tian, Kevin wrote:
> > From: Zhang, Haozhong
> > Sent: Tuesday, January 05, 2016 3:15 PM
> > 
> > On 01/05/16 15:08, Tian, Kevin wrote:
> > > > From: Zhang, Haozhong
> > > > Sent: Wednesday, December 30, 2015 7:49 PM
> > > >
> > > > Pass PCOMMIT CPU feature into HMV domain. Currently, we do not intercept
> > > > pcommit instruction for L1 guest, and allow L1 to intercept pcommit
> > > > instruction for L2 guest.
> > >
> > > Could you elaborate why different policies are used for L1/L2? And better
> > > add a comment in code (at least for vvmx) to describe the intention.
> > >
> > > Thanks
> > > Kevin
> > 
> > The intention is that we completely expose pcommit (both the
> > instruction and VMEXIT caused by pcommit) to L1.
> > 
> > Haozhong
> 
> My question is why pcommit can't not be directly in L2 w/o interception?
> 
> Thanks
> Kevin
> 

Isn't it because L1 hypervisor may decide to intercept L2 pcommit?

Haozhong

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