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

To: "Rui-Tao Dong" <ruitao.dong@xxxxxxxxx>
Subject: [Xen-users] Re: vtd / pci passthru broken in 3.3?
From: "Andrew Lyon" <andrew.lyon@xxxxxxxxx>
Date: Fri, 12 Dec 2008 07:37:41 +0000
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On Thu, Dec 11, 2008 at 11:59 PM, Rui-Tao Dong <ruitao.dong@xxxxxxxxx> wrote:
> Hi Andy,
> Thanks for the reply and sorry about the messed up email address.
> I installed the same version of the BIOS and enabled VT-d & VT and
> powered it off for a few minutes.  After restarting, I checked to make
> sure that VT-d & VT are still enabled.
> I did
> root (hd0,6)
> kernel /boot/xen.gz-3.3.0
> module /boot/vmlinuz-2.6.18-92.1.10.el5xen ro vtd=1 iommu=1

Thats wrong, you need to pass iommu=1 to xen, not the linux kernel:

kernel /boot/xen.gz-3.3.0 vtd=1 iommu=1


> root=LABEL=/CentOS
> module /boot/initrd-2.6.18-92.1.10.el5xen.img
> but xm dmesg still tells me
> (XEN) I/O virtualisation disabled.
> --
>   Rui-Tao
>  andrew.lyon> I have never updated the BIOS, it came with 1.1b:
>  andrew.lyon> # dmidecode 2.9
>  andrew.lyon> SMBIOS 2.5 present.
>  andrew.lyon> 57 structures occupying 2109 bytes.
>  andrew.lyon> Table at 0xBFF66000.
>  andrew.lyon> Handle 0x0000, DMI type 0, 24 bytes
>  andrew.lyon> BIOS Information
>  andrew.lyon>         Vendor: Phoenix Technologies LTD
>  andrew.lyon>         Version: 1.1b
>  andrew.lyon>         Release Date: 08/04/2008
>  andrew.lyon>         Address: 0xE3740
>  andrew.lyon>         Runtime Size: 116928 bytes
>  andrew.lyon>         ROM Size: 2048 kB
>  andrew.lyon>         Characteristics:
>  andrew.lyon> Make sure you have enabled vt-d in the BIOS,  if it was
> disabled you
>  andrew.lyon> will need to power off the system (shutdown then remove
> power cord for
>  andrew.lyon> a few seconds) and then power up for it to be enabled.
>  andrew.lyon> If you are using Xen 3.3 you need iommu=1, older
> versions used vtd=1.
>  andrew.lyon> Andy

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