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

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Date:	Fri, 3 Jan 2014 15:50:02 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	David Vrabel <david.vrabel@...rix.com>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	<linux-kernel@...r.kernel.org>, <xen-devel@...ts.xenproject.org>,
	<boris.ostrovsky@...cle.com>, <stefano.stabellini@...citrix.com>,
	<mukesh.rathor@...cle.com>
Subject: Re: [PATCH v12 06/18] xen/pvh: MMU changes for PVH (v2)

On Thu, 2 Jan 2014, David Vrabel wrote:
> On 01/01/14 04:35, Konrad Rzeszutek Wilk wrote:
> > From: Mukesh Rathor <mukesh.rathor@...cle.com>
> > 
> > .. 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.

Right.
Aside from this:

Acked-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
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