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[Xen-users] Problems with >4GB memory with 64-bit Xen kernel

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Subject: [Xen-users] Problems with >4GB memory with 64-bit Xen kernel
From: Matthew Ragan <mdr@xxxxxxxxxxxxxxx>
Date: Sun, 25 May 2008 12:53:28 -0400
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I've been running the 64-bit version of the Xen 3.1.4 hypervisor with a NetBSD (recent -current) dom0 for a number of weeks now, and haven't had any real problems with it. Previously, the system that I am running this on (Dell Dimension E510, Pentium D 940) has been running fine with 1GB of memory in the system. Because I want to use this system to house a number of database VMs that may chew memory, I put 8GB in the system today, and now the system refuses to boot unless I specify 'mem=4G' or lower.

I know other people have more than 4GB in their running systems, and NetBSD boots fine and finds all 8G when I boot it without using Xen, so I'm not sure what the issue is. I've tried this with a number of different 3.1.0 and 3.2.x kernels, and all have similar problems. Setting 'mem=' to other values above 4GB results in the same errors, except for the ending value in the last (usable) line.

Boot shows:

(XEN) Command line: (hd0,3,a)/xen.gz dom0_mem=256m
(XEN)  0000000000000000 - 0000000000000000 (usable)
(XEN)  00000000000f0000 - 0000000000100000 (reserved)
(XEN)  0000000000010000 - 00000000dfe88000 (usable)
(XEN)  00000000dfe88c00 - 00000000dfe8ac00 (ACPI NVS)
(XEN)  00000000dfe8ac00 - 00000000dfe8cc00 (ACPI data)
(XEN)  00000000dfe8cc00 - 00000000e0000000 (reserved)
(XEN)  00000000f0000000 - 00000000f4000000 (reserved)
(XEN)  00000000fec00000 - 00000000fed00400 (reserved)
(XEN)  00000000fed20000 - 00000000feda0000 (reserved)
(XEN)  00000000fee00000 - 00000000fef00000 (reserved)
(XEN)  00000000ffb00000 - 0000000100000000 (reserved)
(XEN)  0000000100000000 - 0000000200000000 (usable)
(XEN) System RAM: 7678MB (7862432kB)
(XEN) Xen heap: 13MB (14032kB)
(XEN) Domain heap initialised: DMA width 32 bits
(XEN) ****************************************
(XEN) Panic on CPU 0:
(XEN) Early fatal page fault at e008:ffff8300001129d4 (cr2=ffffffffffffffff, ec=0002)
(XEN) ****************************************
(XEN) Reboot in five seconds...
(XEN) Unknown interrupt

-- Matt

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