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xen-devel
[Xen-devel] Re: [PATCH] Fix the RHEL4 guest hang
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To: |
"Kamble, Nitin A" <nitin.a.kamble@xxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH] Fix the RHEL4 guest hang |
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From: |
Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
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Date: |
Fri, 5 May 2006 08:05:39 +0100 |
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Cc: |
"Mallick, Asit K" <asit.k.mallick@xxxxxxxxx>, Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, "Nakajima, Jun" <jun.nakajima@xxxxxxxxx> |
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Fri, 05 May 2006 00:10:08 -0700 |
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On 5 May 2006, at 04:17, Kamble, Nitin A wrote:
The reason for the infinite loop is changeset 9699. With that
the guest page fault was always getting overridden by the int 0xff gp
fault coming from the IDT_VECTORING_INFO. With the attached patch if
VMM
is injecting exceptions like page faults or gp faults then
IDT_VECTORING_INFO field does not override it, and that breaks the
vmexit infinite loop for the rhel4.
Ok, that makes sense thanks.
Is it not possible to specify that software interrupts do not cause a
VMEXIT? That would seem to avoid the problem totally (as the original
'int 0xff' wouldn't vmexit), but it looks like maybe it's not possible.
-- Keir
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