linux-kernel - Re: Introducing paravirt_ops for x86

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Date:	Wed, 8 Aug 2007 21:31:17 -0300
From:	"Glauber de Oliveira Costa" <glommer@...il.com>
To:	"Nakajima, Jun" <jun.nakajima@...el.com>
Cc:	"Glauber de Oliveira Costa" <gcosta@...hat.com>,
	linux-kernel@...r.kernel.org, lguest@...abs.org,
	virtualization@...ts.linux-foundation.org, chrisw@...s-sol.org,
	anthony@...emonkey.ws, akpm@...ux-foundation.org, mingo@...e.hu
Subject: Re: Introducing paravirt_ops for x86_64

On 8/8/07, Nakajima, Jun <jun.nakajima@...el.com> wrote:
> > So, unless I'm very wrong,  it only makes sense to talk about not
> > supporting large pages in the guest level. But it is not a
> > paravirt_ops problem.
>
> Some MMU-related PV techiniques (including Xen, and direct paging mode
> for Xen/KVM) need to write-protect page tables, avoiding to use 2MB
> pages when mapping page tables. Looks like you did not, and that
> exaplains why the patches are missing the relevant (many) paravirt_ops
> in include/asm-x86_64/pgalloc.h, for example, compared with the i386
> tree.
I see.

I'll address this in the next version of the patch.


-- 
Glauber de Oliveira Costa.
"Free as in Freedom"
http://glommer.net

"The less confident you are, the more serious you have to act."
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