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Old 11-21-2008, 02:36 AM   #1
Registered: Dec 2006
Location: Colorado
Distribution: Slackware
Posts: 456

Rep: Reputation: 63
Smile [RESOLVED] KVM - Hypervisor too old?

I'm trying to get KVM to run on my Slack 12.1 gen-smp AMD Athlon 64 X2 4400+ box. I used the "kvm" SlackBuilds package. "cat /proc/cpuinfo" shows svm is available. The kvm & kvm-amd modules load OK. The process fails when I try to launch the guest OS. I get the following error with both KVM v78 or v79 when I issue the qemu-system-x86_64... command:

Hypervisor too old: KVM_CAP_USER_MEMORY extension not supported
Could not create KVM context
Doesn't seem to matter what options I add or delete when I launch the guest. Google pulls up a bunch of references to patches when I search on "KVM_CAP_USER_MEMORY" that don't help me. This sounds like it might be a hardware issue. Maybe a chip rev that's not recent enough. The same guest works fine on my Slack 12.1 gen-smp AMD Athlon 64 X2 5000+ box.

I suppose I could fall back to QEMU/KQEMU if I have too but I prefer KVM and the speed benefits of the hardware-assist.


Last edited by Chuck56; 11-21-2008 at 12:23 PM.
Old 11-21-2008, 12:10 PM   #2
Registered: Dec 2006
Location: Colorado
Distribution: Slackware
Posts: 456

Original Poster
Rep: Reputation: 63
RESOLVED! I had 2 sets of kvm modules in my /lib/modules/ tree. Operator error with all my attempts to fix the problem. My resolution was to rmmod kvm-amd and kvm, remove, recompile, reinstall the package. A quick modprobe kvm-amd and the guest started up on first attempt.

I was able to get help on the kvm irc channel at freenode which is the support method recommended at the KVM site. Thanks to "iggy" wherever you are!


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