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.
-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2005.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=46FB8A65.6000504@qumranet.com \
--to=avi-atkuwr5tajbwk0htik3j/w@public.gmane.org \
--cc=eddie.dong-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org \
--cc=kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.