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Re: [Xen-devel] NMI deferral on i386
| To: | "Keir Fraser" <keir@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] NMI deferral on i386 |
| From: | "Jan Beulich" <jbeulich@xxxxxxxxxx> |
| Date: | Wed, 16 May 2007 12:10:17 +0200 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Wed, 16 May 2007 03:08:41 -0700 |
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| In-reply-to: | <C2707F36.772A%keir@xxxxxxxxxxxxx> |
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| References: | <464ADA4F.76E4.0078.0@xxxxxxxxxx> <C2707F36.772A%keir@xxxxxxxxxxxxx> |
| Sender: | xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
>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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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