[Xen-users] 4G limitation for PV domU when PCI-passthru is applied

["Fan, Huaxiang" <hufan@xxxxxxxxxxxx>]

Hi gurus,

 

I have setup a prototype with below configurations:

 

Hardware: Dell R210

NICs: Broadcom NetXtreme II BCN5709/5716 (w/o FLR)

Xen: xen 4.1.2

Kernel: 3.6.32.57 (final version of xen community)

Distribution: Centos 6.2 (upgraded to above kernel)

 

 

When I was trying to PCI passthru 1 or 2 NICs to a domU assigned with 6G (>4G) memory, the PCI activation failed due to BAR 0 collision.  Is e820_host option in xen 4.2 relevant to this? Actually I upgrade the xen to 4.2-unstable, the domU could boot with PCI passthru succeed, but the ‘cat /proc/meminfo’ indicated the total memory had been shrink to 3G.

 

Any thoughts?

 

Thanks in advance

HUAXIANG FAN
Software Engineer II

WEBSENSE NETWORK SECURITY TECHNOLOGY R&D (BEIJING) CO. LTD.
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