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Re: [Xen-devel] Re: Problem with Xen 4.1 on Ubuntu 11.10 ( Oneiric Ocelot) (HVM DomUs crash)

To: Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

From: Boris Derzhavets <bderzhavets@xxxxxxxxx>

Date: Tue, 19 Jul 2011 11:15:22 -0700 (PDT)

Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>

Delivery-date: Tue, 19 Jul 2011 11:16:58 -0700

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Might be. Packaging has been done by Ubuntu. Packages uploaded to Repos
I just installed *.deb packages been already patched and compiled , but can get
source before patching as well.
I've zipped hvmloader installed via system setup of xen tools, e.g. after patching

Boris

--- On Tue, 7/19/11, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> wrote:

From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Subject: [Xen-devel] Re: Problem with Xen 4.1 on Ubuntu 11.10 ( Oneiric Ocelot) (HVM DomUs crash)
To: "Stefano Stabellini" <Stefano.Stabellini@xxxxxxxxxxxxx>
Cc: "Boris Derzhavets" <bderzhavets@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Keir Fraser" <keir@xxxxxxx>, "Konrad Rzeszutek Wilk" <konrad.wilk@xxxxxxxxxx>
Date: Tuesday, July 19, 2011, 2:01 PM

On Tue, 19 Jul 2011, Stefano Stabellini wrote:
> On Tue, 19 Jul 2011, Boris Derzhavets wrote:
> > Alpha 2 already has Xen 4.1 packaged and ready for testing.
> > It appears to be known bug that HVM DomUs crash at Xen 4.1 Dom0 with different "pvops''
> > kernels ( in particular 3.0.0-5-generic Ubuntu) , but not only on Ubuntu .
> > Here is report for Fedora 15 :
> >
> > http://www.gossamer-threads.com/lists/xen/users/213049?nohighlight=1#213049
> >
> > Ubuntu developers are pretty sure that Xen Host will be built with no problems.
> > Would it be possible to issue a patch for Xen 4.1 to fix the problem ?
> > Actually two distros are affected Fedora 16 and Ubuntu 11.10 ( maybe Debian - here
> > i am not sure )
>
> First we need to understand what the problem is. I wasn't aware of this
> issue before you started a thread yesterday and nothing meaningful
> appears in any of the logs posted.
>
> Now I am trying to reproduce the problem but so far I didn't have any
> luck: I am testing with the same kernel config and VM config you use
> with plain Linux 3.0.0 rc7, I tried both xen 4.1.0 and xen 4.1.1 but I
> still can start hvm guests with no troubles.
>
> However all my tests are on Debian 6.0.1, I am downloading alpha 2 to
> see if I can reproduce the bug there.

I managed to repro the issue on alpha 2.
These are the error logs that I get on the xen serial when starting an
HVM guest:

(XEN) HVM1: HVM Loader
(XEN) io.c:194:d1 MMIO emulation failed @ 0018:9ffff: 00 e0 de be 00 83
(XEN) hvm.c:1099:d1 Triple fault on VCPU0 - invoking HVM system reset.

The problem appears to be hvmloader, in fact I replaced the hvmloader
that comes with ubuntu alpha 2 with the one I compiled myself out of xen
4.1.1 and everything worked as expected.
Do you have any patches to xen that might have broken hvmloader?

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