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

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Message-ID: <20140102173639.3869d841@mantra.us.oracle.com>
Date:	Thu, 2 Jan 2014 17:36:39 -0800
From:	Mukesh Rathor <mukesh.rathor@...cle.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>
Subject: Re: [PATCH v12 06/18] xen/pvh: MMU changes for PVH (v2)

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

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
here.

Mukesh

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