Hello, I was trying to achieve VGA-passthrough but I have encountered a
problem enabling VT-d on Xen-unstable,
I was able to use it in the past with the changeset 23350 but if I use the
changeset 23799 or greater this feature is automatically disabled,
so there must be some changes between those two changesets that provokes
VT-d crash on my computer.
Details below:
-Mother board: Intel DQ35MP.
-Bios version 1143 (the latest version available, it is from 2010).
-Options VT Technology and VT for directed I/O (VT-d) are enabled.
-Using the option iommu=force in grub entry
''# xm dmesg'' output with *changeset 23799*:
(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
''# xm dmesg'' output with *changeset 23350*:
...
(XEN) Intel VT-d Snoop Control not enabled.
(XEN) Intel VT-d Dom0 DMA Passthrough not enabled.
(XEN) Intel VT-d Queued Invalidation not enabled.
(XEN) Intel VT-d Interrupt Remapping not enabled.
(XEN) [VT-D]iommu.c:847: iommu_fault_status: Fault Overflow
(XEN) [VT-D]iommu.c:850: iommu_fault_status: Primary Pending Fault
(XEN) [VT-D]iommu.c:825: DMAR:[DMA Write] Request device [00:02.0] fault
addr ffffff000, iommu reg = fff16000
...
(XEN) Enabling APIC mode: Flat. Using 1 I/O APICs
(XEN) I/O virtualisation enabled
I can see I/O enabled but all the VT-d features are disabled, so maybe
that''s why with the last revision of XEN I can''t have I/O
virtualisation
enabled. Am I still able to use vga-passthru with this kind of output?
Thanks in advance
Javier
-----
JavMV
--
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