[ kvm-Bugs-1795722 ] 64bit windows guest works on intel but not amd

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Bugs item #1795722, was opened at 2007-09-16 11:02
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Alex Moore (lightspd10)
Assigned to: Nobody/Anonymous (nobody)
Summary: 64bit windows guest works on intel but not amd

Initial Comment:
I noticed that the release notes for kvm-36 mentioned the addition of support for 64-bit windows guests, which is the feature I have been waiting for.

It does indeed work nicely on my Intel desktop machine (a Core 2 Extreme QX6700). But not on my AMD based server (an Opteron 2210).

When attempting to boot the 64-bit Windows guest on the Opteron, the guest bluescreens immediately. This occurs both when trying to boot the Windows installation CD and also when trying to boot the already-installed OS, having copied the disk image over from the Intel host. The Windows OS I'm using is Windows Server 2003 x64 Edition.

I then upgraded to the latest kvm release (kvm-39), but the problem remains.

Note that both the Intel and AMD host machines are using kernel 2.6.22 (64-bit), and in both cases I am using the kernel modules provided by the kvm package, not the ones available in the kernel itself.

This problem does NOT occur if I add the -no-kvm option to the command line on the AMD64 host (ie the guest then boots successfully).

P.S. I didn't see any info on "-no-kvm" in the man page... what am I missing out on if I run it with that switch?

Alex

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