Re: [Xen-devel] AMD IOMMU disabled - No Perdev Intremap

[Ferdinand Nölscher <ferdinand@xxxxxxxxxxx>]

Hi Sander,

Thanks for your reply.

On 10/06/2013 02:10 PM, Sander Eikelenboom wrote:
> 
> Sunday, October 6, 2013, 1:36:33 PM, you wrote:
> 
>> Hi!
> 
>>> From other people posting to this list, I know that there has
>>> been a
>> bug related to the issue described in Xen Security Advisory 36
>> that disables iommu for some AMD users like me.
> 
> What motherboard do you have ?

I have an ASUS M5A99X EVO Rev 1.01

> 
>> However, even when passing "iommu=no-amd-iommu-perdev-intremap"
>> it still disables i/o virtualisatoin. Related Xen dmesg output:
> 
>> (XEN) IVHD Error: Invalid IO-APIC 0 (XEN) AMD-Vi: Error
>> initialization (XEN) I/O virtualisation disabled
> 
>> Is there _any_ way I can fix this to make IOMMU work again?
>> Updating my BIOS had no effect.
> 
> It depends if it's the north or southbridge ioapic but try using
> the new xen boot parameter: (add it to the xen.gz line in grub)
> 
> ivrs_ioapic[0]=00:14.0
> 
> or
> 
> ivrs_ioapic[0]=00:00.1

I tried both, it still fails to enable i/o virtualisation.

> 
> -- Sander
> 
> 
> 
> 
>> I'm using Xen 4.4 unstable from the official git. Any help is
>> greatly appreciated.
> 
>> kind regards, F. Nölscher
> 
> 
> 
> 
> _______________________________________________ Xen-devel mailing
> list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
> 
> 


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