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[Xen-devel] cpuinfo flags change under 3.2-testing?

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] cpuinfo flags change under 3.2-testing?
From: "Carl Jones" <carl.jones@xxxxxxxxx>
Date: Sat, 13 Sep 2008 17:21:25 +1200
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I'm building Xen on a 64bit machine, then using the xen.gz from that
on a 32bit host (so that it can boot 64bit guests). This works fine.
However I note that after booting xen.gz from 3.2-testing
/proc/cpuinfo has different flags. 3.2.1 is the same. I have not yet
tried 3.3.x.

3.2.0 results in:
flags             : fpu de tsc msr pae mce cx8 apic sep mtrr mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx
lm constant_tsc pni monitor ds_cpl vmx tm2 cx16 xtpr lahf_lm

3.2-testing (currently 3.2.2-rc5-pre):
flags             : fpu de tsc msr pae cx8 apic sep mtrr cmov pat
clflush acpi mmx fxsr sse sse2 ss ht nx constant_tsc pni

To build I'm grabbing the source from xen.org then simply doing a
'make' from xen/.

Build machine is a Dual Opteron, running CentOS 5.x x86_64. Machine
that I'm booting it on is Dual Xeon Woodcrest, running CentOS 5.x i386
with a 32bit dom0 kernel pulled from xen.org.

# xm info | grep cap
hw_caps                :
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p

# uname -m

# uname -a
Linux host194 #1 Sat Sep 13 00:22:21 UTC 2008 i686 i686
i386 GNU/Linux

Is this a bug or is there perhaps some build option I should be using?


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