Re: [PATCH v12 06/18] xen/pvh: MMU changes for PVH (v2)

From: Mukesh Rathor
Date: Thu Jan 02 2014 - 20:37:52 EST

On Thu, 2 Jan 2014 11:24:50 +0000
David Vrabel <david.vrabel@xxxxxxxxxx> wrote:

> On 01/01/14 04:35, Konrad Rzeszutek Wilk wrote:
> > From: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
> >
> > .. which are surprinsingly small compared to the amount for PV code.
> >
> > PVH uses mostly native mmu ops, we leave the generic (native_*) for
> > the majority and just overwrite the baremetal with the ones we need.
> >
> > We also optimize one - the TLB flush. The native operation would
> > needlessly IPI offline VCPUs causing extra wakeups. Using the
> > Xen one avoids that and lets the hypervisor determine which
> > VCPU needs the TLB flush.
> This TLB flush optimization should be a separate patch.

It's not really an "optimization", we are using PV mechanism instead
of native because PV one performs better. So, I think it's ok to belong


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