linux-kernel - Re: [patch 3/9] Guest page hinting: volatile page cache.

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Message-Id: <1158566897.5728.2.camel@localhost>
Date:	Mon, 18 Sep 2006 10:08:17 +0200
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Chuck Ebbert <76306.1226@...puserve.com>
Cc:	Zachary Amsden <zach@...are.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	virtualization <virtualization@...ts.osdl.org>,
	Andrew Morton <akpm@...l.org>,
	Nick Piggin <nickpiggin@...oo.com.au>
Subject: Re: [patch 3/9] Guest page hinting: volatile page cache.

On Fri, 2006-09-15 at 13:50 -0400, Chuck Ebbert wrote:
> > I wonder which trick you use, since there is only one page table one
> > i386 I can only imagine that you are tracking all page tables of the
> > guest.
> 
> AMD K8 with the SVM feature has host and guest page tables and
> address-space identifiers for the guests so their global TLB flushes
> can be limited to their own address space...

Yeah, I know about the nested page tables on K8. But VMware will not
restrict themselves to K8 only, so they need a clever way to implement
shadow page tables on i386 chips without this feature.

-- 
blue skies,
  Martin.

Martin Schwidefsky
Linux for zSeries Development & Services
IBM Deutschland Entwicklung GmbH

"Reality continues to ruin my life." - Calvin.


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