Re: [Xen-devel] [PATCH][SVM] fix guest hang

["Christoph Egger" <Christoph.Egger@xxxxxxx>]

On Tuesday 20 November 2007 16:29:02 Christoph Egger wrote:
> Changeset 16398 is fine with me. Thank you for committing the fix.

At least SLES 9.3 does not hang at boot. We will do more intensive testing.


> Christoph
>
> On Tuesday 20 November 2007 16:08:32 Keir Fraser wrote:
> > Good catch. Actually I think it is better to clear interrupt_shadow in
> > update_guest_eip. I did this, plus a few other cleanups as c/s 16398 in
> > the unstable staging tree. Please take a look and make sure I didn't
> > screw up.
> >
> >  Thanks,
> >  Keir
> >
> > On 20/11/07 12:56, "Christoph Egger" <Christoph.Egger@xxxxxxx> wrote:
> > > Hi Keir!
> > >
> > > Attached patch fixes a boot hang we have seen with SLES 9.3 and FreeBSD
> > > HVM guests. Both are 32bit guests and run with a 64bit hypervisor.
> > >
> > > The patch does the following:
> > > 1) Cache current vcpu in svm_vmexit_do_hlt
> > > 2) Check for interrupt shadow in svm_vmexit_do_hlt and handle it like a
> > >     pending interrupt
> > >
> > > The boot hang happens when the hlt is intercepted and the interrupt
> > > shadow field in vmcb is set, then the guest waits forever for the next
> > > timer interrupt.
> > >
> > > Change 1) is a cleanup, 2) is the fix
> > >
> > > Signed-off-by: Christoph Egger <Christoph.Egger@xxxxxxx>



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