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xen-devel
RE: [Xen-devel] Re: [PATCH] VT-d: prevent dom0 to use VT-d HW
Dear Christian,
Could you help to look at my problem? Thank you.
Regards,
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics Engineering)
BEng(Hons)(Mechanical Engineering)
Technical Support Engineer
Information Technology Department
Asiasoft Online Pte Ltd
Tampines Central 1 #04-01 Tampines Plaza
Singapore 529541
Republic of Singapore
Mobile: +65-9648-9798
MSN: teoenming@xxxxxxxxxxx
-----Original Message-----
From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Christian
Tramnitz
Sent: Tuesday, September 08, 2009 7:43 PM
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] Re: [PATCH] VT-d: prevent dom0 to use VT-d HW
Han, Weidong wrote:
> pv-ops dom0 contains Linux upstream VT-d driver, and will go to enable it
when VT-d is set in kernel config file. It should not enable VT-d in dom0.
>
> Currently it already zaps ACPI DMAR signature to prevents dom0 using VT-d
HW when VT-d is enabled for Xen. But when VT-d is not enabled for Xen, and
VT-d is set in pv-ops kernel config file, pv-ops dom0 will go to enable it.
This will results in pv-ops dom0 booting failure. This patch prevents dom0
to use VT-d HW whether VT-d is enabled or disabled for Xen.
Wouldn't be easier (and more likely to be adopted by upstream) to add a
Kconfig dependency like "depends on !XEN_DOM0" to VT-d?
Best regards,
Christian
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