Re: Re : Re : Re : Re : [Xen-devel] Re: Patches for VGA-Passthrough XEN 4.2 unstable

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Sep 22, 2011 at 05:15:22AM -0700, JavMV wrote:
> Hi again, I didn't answer you before because I'm having troubles to enable IO
> virtualisation on XEN, I don't know why because it works for me on the past,
> maybe I should try a full and clean installation from the start instead of
> keep using my actual installation which can run xen but starting it manually
> (due to errors)...
> 
> Well I have enabled the next BIOS options:
>     XD Technology <Enable>
>     VT Technology <Enable>
>     Intel(R) VT for Directed I/O (VT-d) <Enable>
> 
> So I think everything is OK but    "  # xm dmesg  "    show these lines:
> 
>    (XEN) [VT-D]dmar.c:456:   Non-existent device (0:2.1) is reported in this
> DRHD\047s scope!
>    (XEN) [VT-D]dmar.c:479:   The DRHD is invalid due to there are devices
> under its scope are not PCI 
>    discoverable! Pls try option iommu=force or iommu=workaround_bios_bug if
> you really want VT-d
>    (XEN) Failed to parse ACPI DMAR. * Disabling VT-d.*
>    (XEN) Table is not found!
>    (XEN) Using ACPI (MADT) for SMP configuration information
>     ...
>   * (XEN) I/O virtualisation disabled*
>     ...


So this looks like a broken BIOS.

Are you running the latest BIOS version?
Which motherboard is that?

-- Pasi


>    (XEN) HVM: ASIDs disabled.
>    *(XEN) HVM: VMX enabled*
>    ...
> 
> I have tryed adding the options iommu=1, iommu=force or
> iommu=workaround_bios_bug in grub menu entry:
> 
>     multiboot /boot/xen-4.2-unstable.gz placeholder
>     module /boot/vmlinuz-2.6.32.45 placeholder root=UUID=..... ro
> *iommu=force*
>     module /boot/intrd.img-2.6.32.45
> 
> I don't know what is wrong now, this is frustrating (I/O) VT-d works for the
> same computer on the past, could this problem be caused by the mixed
> installations? I will try to reinstall everything after format the computer
> but I will wait if you know how to fix this issue without reinstall
> everything again.
> 
> Javier
> 
> 
> 
> 
> -----
> JavMV
> --
> View this message in context: 
> http://xen.1045712.n5.nabble.com/Patches-for-VGA-Passthrough-XEN-4-2-unstable-tp4406265p4829929.html
> Sent from the Xen - Dev mailing list archive at Nabble.com.
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel