From: Avi Kivity <avi@qumranet.com>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: kvm@vger.kernel.org
Subject: Re: lapic & npt
Date: Wed, 04 Jun 2008 19:16:32 +0300 [thread overview]
Message-ID: <4846BFE0.8070507@qumranet.com> (raw)
In-Reply-To: <4846BEB8.1000208@redhat.com>
Gerd Hoffmann wrote:
> Hi,
>
> I've just noticed that xenner doesn't work for 64bit xen guest kernels
> on my new shiny barcelona box. The VM crashes when trying to access the
> lapic. lapic setup is done before idt setup, register dump looks like
> init state, thus it most likely is a triple fault resetting the vcpu.
> Turning off npt fixes it.
>
> xenner maps the lapic to ffff820000000000 (64bit guests) or fe900000
> (32bit guests). 32bit works fine even with npt enabled.
>
> host kernel is fedora 9 with kvm-69 modules.
>
> ideas anyone?
>
>
Turn on logging in lapic.c. See if something turns up.
If not, the page tables are probably set up incorrectly, but in a way
that kvm doesn't notice.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
next prev parent reply other threads:[~2008-06-04 16:16 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-04 16:11 lapic & npt Gerd Hoffmann
2008-06-04 16:16 ` Avi Kivity [this message]
2008-06-06 14:45 ` Gerd Hoffmann
2008-06-06 16:30 ` Avi Kivity
2008-06-27 14:42 ` Gerd Hoffmann
2008-06-30 10:21 ` Gerd Hoffmann
2008-06-04 18:56 ` Vringfd Dong, Eddie
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