[Xen-users] Xen 4.2.1 boot failure with IOMMU enabled

[povder <povder@xxxxxxxxx>]

Hi all

I have a problem with enabling IOMMU on Xen 4.2.1. When I enable it in BIOS
and in grub.conf using iommu=1 kernel option, my machine cannot boot.
I get a following error on serial console:

(XEN) ****************************************
(XEN) Panic on CPU 0:
(XEN) Xen BUG at pci_amd_iommu.c:35
(XEN) ****************************************
(XEN)
(XEN) Reboot in five seconds...

Error says it is a bug, but maybe there is a workaround for it.

I run CentOS 6.3 and use dom0 kernel 3.7.1 and Xen from
http://au1.mirror.crc.id.au/repo/el6/x86_64/ repository,
but I also tried with other 3.x and 2.6.32 kernels and different Xen
builds with no luck.

GRUB entry:
 title CentOS Xen kernel IOMMU serial console (3.7.1-3.el6xen.x86_64)
        root (hd0,0)
        kernel /xen.gz dom0_mem=1G,max:1G dom0_max_vcpus=1
dom0_vcpus_pin iommu=verbose loglvl=all guest_loglvl=all iommu=1
com1=38400,8n1 console=com1
        module /vmlinuz-3.7.1-3.el6xen.x86_64 ro
root=/dev/mapper/vg_titan_raid5-lv_titan_root
rd_LVM_LV=vg_titan_raid5/lv_titan_root rd_NO_LUKS LANG=en_US.UTF-8
rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto
rd_LVM_LV=vg_titan_raid5/lv_titan_swap  KEYBOARDTYPE=pc KEYTABLE=us
rd_NO_DM console=hvc0 earlyprintk=xen nomodeset
        module /initramfs-3.7.1-3.el6xen.x86_64.img

Hardware info:
 Motherboard: M4A89TD PRO USB3 (AMD 890FX chipset)
 CPU: AMD Phenom II X6 1045T

Software info:
 OS: CentOS 6.3 64bit
 Xen: 4.2.1
 BIOS version: 3029 (up to date)

Detailed information:
 Full serial output: http://pastebin.com/raw.php?i=K1DuhDcj
 xl info (when booting with iommu=0): http://pastebin.com/raw.php?i=jU7bEFrN
 lspci -vvv: http://pastebin.com/raw.php?i=3wpKPQT9
 dmidecode: http://pastebin.com/raw.php?i=7wEcTXzr
 kernel config: http://pastebin.com/raw.php?i=zYgGZ84f

Please help
povder

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