From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: Sander van Leeuwen <sandervl-2taLTamkYL2ELgA04lAiVw@public.gmane.org>
Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: KVM & VMX root mode
Date: Sat, 01 Sep 2007 17:25:45 +0300 [thread overview]
Message-ID: <46D97669.7050609@qumranet.com> (raw)
In-Reply-To: <46D81156.8050100-2taLTamkYL2ELgA04lAiVw@public.gmane.org>
Sander van Leeuwen wrote:
> Hi,
>
> We have had several reports of users saying our product VirtualBox
> crashes their (Linux) host. It turned out that KVM is responsible, because
> it leaves the CPU in VMX root mode.
>
> Doing this changes the way the cpu operates: updates to reserved bits in
> control registers cause general protection faults.
> We hit such cases on two occasions; clearing the X86_CR4_VMXE bit in CR4
> and turning off paging.
>
> I have added a workaround to detect VMX root mode, simply refuse to run
> and recommend that the user disables KVM.
> I would however appreciate if you could fix KVM instead.
>
>
Simply '/sbin/rmmod kvm-intel' and kvm will exit vmx root mode.
--
Any sufficiently difficult bug is indistinguishable from a feature.
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next prev parent reply other threads:[~2007-09-01 14:25 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-31 13:02 KVM & VMX root mode Sander van Leeuwen
[not found] ` <46D81156.8050100-2taLTamkYL2ELgA04lAiVw@public.gmane.org>
2007-09-01 14:25 ` Avi Kivity [this message]
[not found] ` <46D97669.7050609-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-09-01 14:33 ` Alexey Eremenko
[not found] ` <7fac565a0709010733j2c3f58aav743949a3021a5c30-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2007-09-01 14:35 ` Avi Kivity
[not found] ` <46D9789B.9040001-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-09-01 14:44 ` Alexey Eremenko
2007-09-01 15:09 ` Sander van Leeuwen
[not found] ` <46D980C2.3040501-2taLTamkYL2ELgA04lAiVw@public.gmane.org>
2007-09-01 15:59 ` Avi Kivity
[not found] ` <46D98C53.4070604-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-09-01 17:24 ` Sander van Leeuwen
[not found] ` <46D9A030.1020904-2taLTamkYL2ELgA04lAiVw@public.gmane.org>
2007-09-01 17:46 ` Alexey Eremenko
2007-09-01 18:42 ` Avi Kivity
[not found] ` <46D9B297.5070502-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-09-03 3:14 ` Daniel P. Berrange
[not found] ` <20070903031403.GA16190-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2007-09-03 7:29 ` Sander van Leeuwen
[not found] ` <46DBB7C1.60708-2taLTamkYL2ELgA04lAiVw@public.gmane.org>
2007-09-03 7:44 ` Avi Kivity
[not found] ` <46DBBB65.3020406-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-09-03 8:09 ` Sander van Leeuwen
[not found] ` <46DBC120.3050301-2taLTamkYL2ELgA04lAiVw@public.gmane.org>
2007-09-03 11:34 ` Avi Kivity
[not found] ` <46DBF13B.9080005-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-09-04 9:51 ` Sander van Leeuwen
[not found] ` <46DD2AA2.8010109-2taLTamkYL2ELgA04lAiVw@public.gmane.org>
2007-09-04 13:55 ` Avi Kivity
[not found] ` <46DD63B6.6050406-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-09-04 14:16 ` Sander van Leeuwen
[not found] ` <46DD68A3.1060403-2taLTamkYL2ELgA04lAiVw@public.gmane.org>
2007-09-04 14:29 ` Avi Kivity
2007-09-04 14:02 ` Anthony Liguori
2007-09-04 14:23 ` Sander van Leeuwen
[not found] ` <46DD6A59.9000104-2taLTamkYL2ELgA04lAiVw@public.gmane.org>
2007-09-04 14:51 ` Anthony Liguori
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