From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: "Dong, Eddie" <eddie.dong-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: kvm-devel <kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
Subject: Re: guest reboot error
Date: Thu, 27 Sep 2007 12:48:05 +0200 [thread overview]
Message-ID: <46FB8A65.6000504@qumranet.com> (raw)
In-Reply-To: <10EA09EFD8728347A513008B6B0DA77A022AE445-wq7ZOvIWXbNpB2pF5aRoyrfspsVTdybXVpNB7YpNyf8@public.gmane.org>
Dong, Eddie wrote:
> kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org wrote:
>
>> I try to implement the guest reboot support, but I found there is an
>> stranger #PF VM Exit in guest real mode cs:ip=f000:10000 which is
>> problemtic and current shadow won;t handle. I then try to
>> use -no-kvm-irqchip and get same error.
>>
>> Can somebody give me more information if you ever successfully
>> run it before.
>> thx,eddie
>>
>>
> correction: It is GP fault, not #PF fault.
>
>
Looks like the bios code was overwritten. If the reboot vector at
f000:fff0 was zeroed out, kvm would just execute a bunch of two-byte
instructions eventually leading to rip = 10000 which is illegal for
vm8086 mode.
Can you add code to kvmctl.c to dump the contents of that memory region
at the time of failure?
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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next prev parent reply other threads:[~2007-09-27 10:48 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-27 9:58 guest reboot error Dong, Eddie
[not found] ` <10EA09EFD8728347A513008B6B0DA77A022AE441-wq7ZOvIWXbNpB2pF5aRoyrfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2007-09-27 10:09 ` Dong, Eddie
[not found] ` <10EA09EFD8728347A513008B6B0DA77A022AE445-wq7ZOvIWXbNpB2pF5aRoyrfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2007-09-27 10:48 ` Avi Kivity [this message]
[not found] ` <46FB8A65.6000504-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-09-28 2:27 ` Dong, Eddie
[not found] ` <10EA09EFD8728347A513008B6B0DA77A022AE67A-wq7ZOvIWXbNpB2pF5aRoyrfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2007-09-28 8:56 ` Dong, Eddie
[not found] ` <10EA09EFD8728347A513008B6B0DA77A022AE9B4-wq7ZOvIWXbNpB2pF5aRoyrfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2007-09-28 14:38 ` Avi Kivity
[not found] ` <46FD11C8.8040701-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-09-29 10:29 ` Dong, Eddie
[not found] ` <10EA09EFD8728347A513008B6B0DA77A022AEB9A-wq7ZOvIWXbNpB2pF5aRoyrfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2007-09-30 10:51 ` Avi Kivity
2007-09-28 14:44 ` Avi Kivity
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