[Xen-users] After upgrade from 4.1 -> 4.3 domU will not boot with iommu=soft

[Tomas Agartz <tlund@xxxxxx>]

My system is a Thinkpad x220 laptop with Debian 7.3 x64 (kernel 3.2 and 
xen 4.1).
I have one DomU and it has two PCI-devices assigned. The domU kernel needs 
to boot with "iommu=soft" for this to work properly. Everything working as 
expected in both dom0 and domU except dom0 acpi suspend/resume. (suspends 
fine, but does not wake up on resume).
After spening some time on google I find out that resume is not really 
working with 3.2 kernel and xen 4.1 (needs atleast 3.11 and 4.2.2).
I upgrade to the 3.12 kernel and xen 4.3 packages from from debian 
unstable. Doing acpi suspend/resume now works witout any other 
modification to the system.
However, the domU will no longer boot. When pygrub starts the kernel 
(after running "xm start -c domu"), there is ZERO output and I get the 
prompt of the dom0 back after about 3-4 seconds. (I removed the "quiet" 
option from the kernel, ofc). xend.log just says "Domain has crashed".
If i remove the "iommu=soft" option from the domU kernel, it boots fine 
(but the PCI devices are not working in the domU).
After searching for people with similar problems I increased the domU 
memory from 256 to 512 Mbyte. I also tried upgrading the domU kernel to 
the same 3.12 kernel as the dom0 is using, but neither of those things 
helped.
Looking for any hints on how to go forwards :)

Best regards,
Tomas

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