RE: [Xen-devel] Xen-3.2.1 VT-d Support (NOT SURE WHETHER IT'S A

As Dexuan suggested I used xen3.2.2-rc2.

With this version of xen with vtd=1 boot parameter I could boot successfully (I was not able to boot with vtd=1 in xen-3.2.1).

But I see the following in the boot messages when I do a xm dmesg after a boot.

===================================================

(XEN) Xen heap: 14MB (14956kB)

(XEN) Domain heap initialised: DMA width 32 bits

(XEN) Processor #0 6:15 APIC version 20

(XEN) Processor #1 6:15 APIC version 20

(XEN) IOAPIC[0]: apic_id 2, version 32, address 0xfec00000, GSI 0-23

(XEN) Enabling APIC mode: Flat. Using 1 I/O APICs

(XEN) [VT-D]dmar.c:441: RMRR is incorrect.

(XEN) Failed to parse ACPI DMAR. Disabling VT-d.

(XEN) [VT-D]ACPI DMAR:No DMAR devices found

===================================================

If you observe the messages highlighted in RED.

VT-d is getting disabled due to some RMRR incorrect problem and in the dmar.c code this is the condition which is causing this.

if ( rmrr->base_address >= rmrr->end_address )

{

dprintk(XENLOG_ERR VTDPREFIX, "RMRR is incorrect.\n");

return -EFAULT;

}

This code is in acpi_parse_one_rmrr function.

Thx,

Venkat

================================

Venkata Kumar Duvvuru,

LSI Engenio,

Adv. Development,

Bangalore.

Mob: +91-9880318542

Off : +91-80-41978700 ( Extn : 3544 )

================================

From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Cui, Dexuan
Sent: Wednesday, August 06, 2008 10:58 AM
To: Bryan York; Han, Weidong
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-devel] Xen-3.2.1 VT-d Support (NOT SURE WHETHER IT'S A BUGOR...)

Hi Bryan,

According to our tests using the latest xen-unstable, the assignment of SATA controller (like in AHCI mode or Enhanced mode) should be OK on the DQ35 platform.

For xen-unstable, I guess you didn't specify "iommu=1" in the Xen grub entry? By default, VT-d is not enabled in the latest xen-unstable.

Thanks,
-- Dexuan

From: Bryan York [mailto:bryan.york@xxxxxxxxx]
Sent: 2008年8月6日 12:10
To: Han, Weidong
Cc: Cui, Dexuan; xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] Xen-3.2.1 VT-d Support (NOT SURE WHETHER IT'S A BUGOR...)

Hello,

Thanks for the information. I'm trying to forward a PCI express SATA/PATA controller with a JMicron chipset. (Info here.) I know there have been problems with graphics cards in general, but I thought it was possible with disk controllers? Is there a list of well supported hardware (disk controllers) that can be used for VT-d?

Also, your RMRR explanation makes sense for the mercurial 3.2-testing, but what about xen-unstable? I didn't see any errors there besides "I/O Virtualisation disabled" with no other reason listed.

Thanks so much for your help on this. I will also try removing the disk controller and see if the mercurial Xen-3.2-testing boots without RMRR errors.

Regards,

-Bryan

On Tue, Aug 5, 2008 at 6:27 PM, Han, Weidong <weidong.han@xxxxxxxxx> wrote:

Hi Bryan,

I think you are using an add-on graphic card (iGfx disabled), right? We also met this issue before. Obviously it's a BIOS issue (RMRR is incorrect). When parsing apci dmar failed, VT-d will be disabled.

Randy (Weidong)

From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Bryan York
Sent: 2008年8月6日 6:17
To: Cui, Dexuan
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx

Subject: RE: [Xen-devel] Xen-3.2.1 VT-d Support (NOT SURE WHETHER IT'S A BUGOR...)

Hello,

I'm also seeing this exact same problem. I've posted on xen-users, but did not get an answer. Venkat seems to be experiencing the same problem as me. I have the latest BIOS for my motherboard DQ35JO. (BIOS ver 933) I'm running a Q6600 as well. It hangs at "Brought up 4 CPUs." I've tried all sorts of combinations of Xen versions and kernels to get this working. And, yes, VT and VT-d are enabled in my BIOS.

1) CentOS 5.2 SRPMS compiled with Xen 3.2.1. Adding pci=nommconf does not get it to boot.

2) Mercurial Xen-3.2-testing. Here, after adding pci=nommconf, I get:

(XEN) [VT-D]dmar.c:441: RMRR is incorrect.
(XEN) Failed to parse ACPI DMAR. Disabling VT-d.
(XEN) [VT-D]ACPI DMAR:No DMAR devices found

3) Mercurial Xen-unstable, I get "I/O Virtualisation disabled" I can't find any reason why this is the case. VT-D is not enabled.

I would really like to find the cause for this. I don't know if this is a BIOS bug or what. This board is supposedly supported on Xen per the VT-D wiki. Other people seem to have the same problem as me:

http://forums12.itrc.hp.com/service/forums/bizsupport/questionanswer.do?admit=109447627+1217898320366+28353475&threadId=1234588

Thanks for any and all help,

-Bryan

The BIOS version I use may be not the exact one as yours. I mean I expect you're
not using a very old BIOS. :-)

How about trying the xen 3.2.2-rc2 and the latest xen-unstable first? There are some VT-d bug fixes between 3.2.1 (you're using it) and 3.2.2-rc2.

Thanks,

-- Dexuan

________________________________

From: Kumar, Venkat [mailto:Venkat.Kumar@xxxxxxx] Sent: 2008年8月5日 14:37 To: Cui, Dexuan; xen-devel@xxxxxxxxxxxxxxxxxxx Subject: RE: [Xen-devel] Xen-3.2.1 VT-d Support (NOT SURE WHETHER IT'S A BUG
OR...)

If you don't mind can you send me the BIOS version you are using?

Thx,

Venkat

================================

Venkata Kumar Duvvuru,

LSI Engenio,

Adv. Development,

Bangalore.

Mob: +91-9880318542

Off : +91-80-41978700 ( Extn : 3544 )

================================

________________________________

From: Cui, Dexuan [mailto:dexuan.cui@xxxxxxxxx] Sent: Tuesday, August 05, 2008 12:03 PM To: Kumar, Venkat; xen-devel@xxxxxxxxxxxxxxxxxxx Subject: RE: [Xen-devel] Xen-3.2.1 VT-d Support (NOT SURE WHETHER IT'S A BUG
OR...)

Hi Venkat,

Can you confirm you're using the latest BIOS? Can you try the xen 3.2.2-rc2 and
the latest xen-unstable on the same host?

I have the similar host. Xen 3.2.2-rc2 and the latest xen-unstable both work
well on it.

Thanks,

-- Dexuan

________________________________

From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Kumar, Venkat Sent: 2008年8月5日 12:21 To: xen-devel@xxxxxxxxxxxxxxxxxxx Subject: [Xen-devel] Xen-3.2.1 VT-d Support (NOT SURE WHETHER IT'S A BUG OR...)

After building Xen-3.2.1 I could successfully boot into it if I avoid giving
vtd=1 as the boot parameter.

If I pass vtd=1 as the boot parameter to xen, the system hangs while booting.

The system hangs after the following messages

============================

Boot messages

[XEN]…..

[Xen] Brought up 2 CPUs...

=========================

My chipset DQ35 series is having VT-d support and is enabled in the BIOS as
well.

My domain0 is CentOS-5.2(2.6.18.8-xen).

Is this a possible bug or some thing else??

Any Idea??

Thx,

Venkat

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RE: [Xen-devel] Xen-3.2.1 VT-d Support (NOT SURE WHETHER IT'S A BUGOR...