From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christian Tramnitz <chris.ace@gmx.net>
Subject: Re: [pvops xen/next ][iommu] attenpt to passthrough
 PCI-e usb controllor
 to PV domU:  (XEN) traps.c:2309:d1 Domain attempted WRMSR 000000000000008b
 from 00000a07:00000000 to 00000000:00000000.
Date: Mon, 22 Mar 2010 10:22:16 +0100
Message-ID: <ho7ctt$76r$1@dough.gmane.org>
References: <1017192770.20100321221949@eikelenboom.it>	<1A42CE6F5F474C41B63392A5F80372B21D641D6D@shsmsx501.ccr.corp.intel.com>	<20100322090450.GA1878@reaktio.net>
	<4BA734BD.5030305@intel.com> <20100322091917.GB1878@reaktio.net>
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At 22.03.2010 10:19, Pasi K=E4rkk=E4inen wrote:
>
> Yeah, that's what I meant. Ok.
>
> I thought it was also possible to use VT-d for a PV guest? no?
>
> -- Pasi

It is, but this requires iommu=3Dpv as hypervisor boot flag.
With iommu=3D1 you can see in the hypervisor log that VTd will be disable=
d=20
for PV.


Best regards,
    Christian