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[Xen-users] Re: vtd / pci passthru broken in 3.3?

To: "Rui-Tao Dong" <rdong@xxxxxxxxxxxxxxx>, "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-users] Re: vtd / pci passthru broken in 3.3?
From: "Andrew Lyon" <andrew.lyon@xxxxxxxxx>
Date: Wed, 10 Dec 2008 11:17:57 +0000
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>>>>>>> "andrew.lyon" == Andrew Lyon <andrew.lyon@xxxxxxxxx> writes:
>>  andrew.lyon> Hi,
>>  andrew.lyon> Is vtd / pci passthru broken in 3.3? On my Supermicro
>> x7dwa-n system I
>>  andrew.lyon> was able to get pci passthru working with 3.2.1, but
>> with 3.3 the xen
>>  andrew.lyon> dmesg states that it is disabled:
>>  andrew.lyon> (XEN) I/O virtualisation disabled
>>  andrew.lyon> I used the same argument to enable vtd as I did with
>> 3.2.1, is this correct:
>>  andrew.lyon> (XEN) Command line: vtd=1 com1=115200,8n1
>> console=vga,com1 noirqbalance
>>  andrew.lyon> Thanks
>>  andrew.lyon> Andy
>> --
On Tue, Dec 9, 2008 at 11:55 PM, Rui-Tao Dong <rdong@xxxxxxxxxxxxxxx> wrote:
> Hi Andrew,
> I have the same exact MB, but couldn't get it to work with VT-d.  What
> version of the BIOS did you have on it?
> --

I have never updated the BIOS, it came with 1.1b:

# dmidecode 2.9

SMBIOS 2.5 present.
57 structures occupying 2109 bytes.
Table at 0xBFF66000.

Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
        Vendor: Phoenix Technologies LTD
        Version: 1.1b
        Release Date: 08/04/2008
        Address: 0xE3740
        Runtime Size: 116928 bytes
        ROM Size: 2048 kB

Make sure you have enabled vt-d in the BIOS,  if it was disabled you
will need to power off the system (shutdown then remove power cord for
a few seconds) and then power up for it to be enabled.

If you are using Xen 3.3 you need iommu=1, older versions used vtd=1.


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