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

[JavMV <javier.manzano@xxxxxxxxxx>]

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*
    ...
   (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
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