Pasi Kärkkäinen
2010-Jan-23 12:59 UTC
[Xen-users] [Xen-devel] collecting info on platforms with VT-d BIOS problems
Hello xen-users,
Intel guys are asking for information about systems/motherboards with buggy
BIOSes
regarding VT-d (IOMMU) support for PCI passthrough.
If Xen disables VT-d I/O virtualization on your setup because of incorrect
information
in BIOS, please post here and/or xen-devel so the Intel guys get to hear about
it and
can forward the information to the motherboard/system/BIOS vendor.
Also try updating to the latest BIOS and see if that helps and fixes the
problem.
Please check "xm dmesg" Xen hypervisor messages for VT-d status on
your setup.
You might see errors like:
(XEN) [VT-D]dmar.c:498: found ACPI_DMAR_RMRR
(XEN) [VT-D]dmar.c:388: RMRR error: base_addr 0 end_address 0
(XEN) Failed to parse ACPI DMAR. Disabling VT-d.
..
(XEN) I/O virtualisation disabled
Or
(XEN) [VT-D]dmar.c:498: found ACPI_DMAR_RMRR
(XEN) [VT-D]dmar.c:388: RMRR error: base_addr d0000000 end_address cfffffff
(XEN) Failed to parse ACPI DMAR. Disabling VT-d.
Please include the "xm dmesg" log, and also all the information from
the mail below.
Thanks!
-- Pasi
----- Forwarded message from "Kay, Allen M"
<allen.m.kay@intel.com> -----
From: "Kay, Allen M" <allen.m.kay@intel.com>
To: "''xen-devel@lists.xensource.com''"
<xen-devel@lists.xensource.com>
Cc: "Han, Weidong" <weidong.han@intel.com>
Date: Fri, 22 Jan 2010 16:22:08 -0800
Subject: [Xen-devel] collecting info on platforms with VT-d BIOS problems
We would like to collect information on platforms that have problem with VT-d
PCI device passthrough using non-IGD PCI devices. Note that IGD (integrated
display device) device passthrough code is still being worked on.
If you have encountered VT-d problems on a particular platform using latest
xen-unstable, please provide the following information so that we can work with
OEM''s to get their BIOS''s fixed:
(a) Platform details (OEM, Product/Model#, Other identifying info)
(b) BIOS version/number
(c) Version of Xen with which failure is seen (if not the latest
xen-unstable)
(d) Specific error/failure details such as serial log
Thanks!
Allen
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