linux-kernel - Re: [Xen-devel] [patch 07/20] XEN-paravirt: paravirt shared kernel pmd flag

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Date:	Mon, 15 Jan 2007 08:59:01 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	"Andrew Morton" <akpm@...l.org>
Cc:	<virtualization@...ts.osdl.org>, <xen-devel@...ts.xensource.com>,
	"Andi Kleen" <ak@....de>, "Rusty Russell" <rusty@...tcorp.com.au>,
	"Chris Wright" <chris@...s-sol.org>,
	<linux-kernel@...r.kernel.org>, "Zachary Amsden" <zach@...are.com>
Subject: Re: [Xen-devel] [patch 07/20] XEN-paravirt: paravirt shared
	kernel pmd flag

>>> Jeremy Fitzhardinge <jeremy@...p.org> 13.01.07 02:45 >>>
>Xen does not allow guests to have the kernel pmd shared between page
>tables, so parameterize pgtable.c to allow both modes of operation.

I don't think the change to vmalloc_sync_all in this patch is necessary -
the mechanism exists solely for dealing with modular users of the die
notifier in the NMI case. Since there's no NMI visible to guests, I don't
think the mechanism is necessary; it could even be completely
circumvented for paravirtual guests.

Jan
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