From: "Jan Beulich" <jbeulich@novell.com>
To: Keir Fraser <keir@xensource.com>
Cc: xen-devel@lists.xensource.com
Subject: Re: NMI deferral on i386
Date: Wed, 16 May 2007 12:10:17 +0200 [thread overview]
Message-ID: <464AF4A9.76E4.0078.0@novell.com> (raw)
In-Reply-To: <C2707F36.772A%keir@xensource.com>
>It sounds a bit painful. Also it's the exit-to-guest path that is more of a
>pain to deal with. In this case we may have restored a segment register by
>the time we take the NMI. What do we do in this case about restoring the
>segment register safely? Races in updating GDT/LDT may mean that the reload
>still may fault, even though it didn't just before; also we may need to do
>work in Xen (e.g., shadow-mode stuff) in interrupts-enabled context to fix
>up a #GP or #PG.
Indeed. Nevertheless, for non-restartable MCEs, deferral is impossible, and
hence some mechanism would still be needed (unless we say the machine's
going down anyway in this case and we don't care about getting a proper
reason logged).
Jan
next prev parent reply other threads:[~2007-05-16 10:10 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-15 14:46 NMI deferral on i386 Jan Beulich
2007-05-15 15:00 ` Keir Fraser
2007-05-16 8:17 ` Jan Beulich
2007-05-16 8:28 ` Keir Fraser
2007-05-16 10:10 ` Jan Beulich [this message]
2007-05-16 12:32 ` Keir Fraser
2007-05-16 14:19 ` Jan Beulich
2007-05-21 14:01 ` Jan Beulich
2007-05-21 14:17 ` Keir Fraser
2007-05-21 14:34 ` Jan Beulich
2007-05-23 10:03 ` Keir Fraser
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