From: Keir Fraser <keir.fraser@eu.citrix.com>
To: Jan Beulich <jbeulich@novell.com>, xen-devel@lists.xensource.com
Subject: Re: [PATCH 5/5] just realized that it's broken
Date: Fri, 30 Jan 2009 11:35:56 +0000 [thread overview]
Message-ID: <C5A8969C.1F92%keir.fraser@eu.citrix.com> (raw)
In-Reply-To: <4982E8F4.76E4.0078.0@novell.com>
Fortunately I think it can be got rid of and probably at little or no
performance cost. I will take a look maybe next week.
-- Keir
On 30/01/2009 10:48, "Jan Beulich" <jbeulich@novell.com> wrote:
> This patch was moving the cpumask out of struct page_info into the page
> itself, but I just realized that this it not valid, since the purpose of the
> mask
> is to avoid a later TLB flush, hence the base assumption is that the page
> might still be in the TLB of some CPU, thus making it possible for a mis-
> behaved guest to still write to that page.
>
> Sorry for the mis-numbering,
> Jan
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
next prev parent reply other threads:[~2009-01-30 11:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-30 10:48 [PATCH 5/5] just realized that it's broken Jan Beulich
2009-01-30 11:35 ` Keir Fraser [this message]
2009-02-04 8:27 ` Jan Beulich
2009-02-04 8:49 ` Keir Fraser
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