linux-kernel - Re: [PATCH 4/9] Vmi fix highpte

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Message-ID: <45E7C80E.1020107@goop.org>
Date:	Thu, 01 Mar 2007 22:45:34 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Zachary Amsden <zach@...are.com>
CC:	Chris Wright <chrisw@...s-sol.org>, Andi Kleen <ak@....de>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/9] Vmi fix highpte

Zachary Amsden wrote:
> Yeah, actually that does work, since you pass the km_type, we can use
> that.  But I would rather not respin this for 2.6.21; getting this
> 100% right can be tricky, and we've already done a good deal of
> testing on this patch the way it is.

It seems fairly low risk to me; its basically the same structure with
the same calls happening in the same order, but just slightly rearranged
in the source.  Of course, if I'd seen this patch earlier I could have
given you earlier feedback...

>   Do you have any objection to me creating a patch for -mm tree that
> implements kmap_atomic_pte the way you have described above and
> attaching it to the Xen patch series, but leaving the current patch as
> is for now?

Not particularly, but it seems odd to put something in knowing its going
to be immediately replaced.  What's the urgency?

> Thanks, (and thanks for the suggestion - I was a little worried about
> how it would play with Xen when HIGHPTE support came around, but it
> looks like it will work for both of us with just one paravirt-op).

Yeah, the kpte_clear_flush change helped as well.  I have a patch to
make that into a pvop as well, since its useful to do the clear+flush in
a single call.

    J
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