From: Keir Fraser <keir@xensource.com>
To: Jan Beulich <jbeulich@novell.com>, Keir Fraser <keir@xensource.com>
Cc: xen-devel@lists.xensource.com
Subject: Re: [PATCH] x86/PAE partially linear page table support
Date: Thu, 15 Feb 2007 13:24:07 +0000 [thread overview]
Message-ID: <C1FA0F77.97A5%keir@xensource.com> (raw)
In-Reply-To: <45D46965.76E4.0078.0@novell.com>
On 15/2/07 13:08, "Jan Beulich" <jbeulich@novell.com> wrote:
> Hmm, it would seem to me that while it may not easily generalize, it at least
> properly extends to the case the patch tries to address, by exchanging
> PGT_base_page_table against PGT_l2_page_table. Really, in current code
> this can never happen for PGT_base_page_table in PAE (or compat mode
> guests), as such references aren't being established anywhere, and hence
> the code should be dead for such guests.
You can't zap an L2 when there could be L3s later in the list that still
reference that L2.
> But even for the general case - wouldn't it be possible to call
> relinquish_memory() CONFIG_PAGING_LEVELS-1 times, each time lowering
> the level of page tables that can be forced invalid by one?
Yeah, this would work. Seems acceptable.
-- Keir
next prev parent reply other threads:[~2007-02-15 13:24 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-15 9:41 [PATCH] x86/PAE partially linear page table support Jan Beulich
2007-02-15 10:25 ` Keir Fraser
2007-02-15 11:41 ` Jan Beulich
2007-02-15 11:58 ` Keir Fraser
2007-02-15 13:08 ` Jan Beulich
2007-02-15 13:24 ` Keir Fraser [this message]
2007-02-16 9:34 ` Jan Beulich
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