Re: [Xen-users] Xen 4.6.0: Dom0 freezes at creation of HVM domain with activated IOMMU

[Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>]

Hi All,

The patch series :

[PATCH v3 0/3] Fix xen crash when starting HVM guest due to missing io 
handler
Should fix this issue. Please give it a try.

Thanks,
Suravee

On 05/21/2016 06:10 PM, Rüdiger Otte wrote:
> On Mon, 9 May 2016 11:28:40 +0200
> Roger Pau Monné wrote:
>
> > I'm adding the AMD IOMMU maintainer.
> >
> > On Sat, May 07, 2016 at 06:06:57PM +0200, Rüdiger Otte wrote:
> > > Hi,
> > >
> > > after upgrading my AMD A8-6500 based system from Xen 4.4.1 to 4.6.0
> > > I'm no longer able to start HVM domains with activated IOMMU. Trying
> > > to create a HVM domain just let the whole system freeze.
> > >
> > > Probably this is a problem with broken firmware but I wonder if there
> > > would be a way to work around this, since with 4.4.1 everything is
> > > running fine even with PCI passthrough of Network, USB and VGA,
> > > as long as I give ivrs_ioapic option to Xen commandline.
> > >
> > > Attached is the output of "xl dmesg" of 4.6.0 and 4.4.1. Because of
> > > the immediate system freeze debug output of 4.6.0 is only to the
> > > point where HVM domain would start.
> > >
> > > What I have tried so far:
> > > - Disabling IOMMU in BIOS or Xen lets HVM domain start. It seems to
> > >    lack graphical output but that's probably a different topic.
> > > - Disabling CPU frequency scaling in BIOS or Xen just leads to the
> > >    same failure.
> > > - Disabling CPU C6 state in BIOS lets system reboot at HVM domain
> > >    creation with Xen 4.4.1.
> > Is there any chance that you could get the serial output of that box? Xen
> > might print some messages before completely freezing, without that I think
> > it's going to be quite hard to debug what's going on.
> It took me some time to get all the equipment to connect the internal
> serial connector of my mainboard to an usb port of a second computer.
> Please see attachment for the output from Xen start to the failed hvm
> domain creation.
>
> Rüdiger
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