[Xen-devel] IOMMU support on AMD Ryzen, simple patch needed

[Bjoern <developer@xxxxxxxxxxxx>]

Hi,

I just completed getting Qubes-OS working with Ryzen and IOMMU - at 
least it looks like it to me and ran out of the box BIOS wise.
All that was required is a small patch in 
xen/arch/x86/oprofile/nmi_int.c - Ryzen family 17h is the same as 15h. 
Without that, "xl dmesg" under Ubuntu 17.04 (self compiled 4.8.3) would 
show that family 17h isn't supported, with the above fix everything 
shows up fine.
Xen 4.8.0 has the IOMMU patch 
(https://patchwork.kernel.org/patch/9145119/) which was required for 
Qubes (Xen 4.6.5), and then it just required the above change and it's 
working apparently... at least Qubes reports working Xen - so looks good.
This is a fyi mail - I do not want to push this fix or something into 
Xen as I also have no idea if I'm missing something else, but if someone 
else wants to pick this up, by all means please do :)
Cheers,
Bjoern

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