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

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Message-ID: <52C54C82.5010802@citrix.com>
Date:	Thu, 2 Jan 2014 11:24:50 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	<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 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.

David
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