[Xen-users] Passthrough of Marvell 88SE9230 card

[Konrad Eisele <eiselekd@xxxxxxxxx>]

I'm trying to passthrough a 4 port Sata Marvell 88SE9230  card to a 

Xen guest. 

My system is

 - GA-970A-DS3P board with a AMD FX(tm)-8350 AMD cpu

 - dom0: Ubutu 18.04 4.15.0-29-generic Xen-4.9

 - Guest is a FreeBSD (FreeNAS 11.2-beta1) installation.  

The 88SE9230 card is/seems to be passed through to the Xen guest

(when looking at lspci and pciconf), however there is a strange behaviour:

Of the 4 SATA ports of the  Marvell 88SE9230 card only the last port

detects a disk, i.e. when I have port 2 and 3 populated then only the 

disk at port 3 is detected, when I have port 0 and 1 populated then only 

port 1 is detecting a disk. 

When running the same Guest in KVM instead with linux "iommu=pt", then

the card works as expected and all disk are detected.

Is there something I can do to make this work? Is there maybe a iommu

feature that KVM handles by default and that I have to specify in Xen 

explicitly?

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