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


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.

Any help is appreciated!


Attachment: dmesg.4.4.1.txt
Description: Text document

Attachment: dmesg.4.6.0.txt
Description: Text document

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