Can't start KVM domains [SOLVED]

[mgnut57]

KVM was working on my system, but I have not used it for quite some time. Now, however, KVM domains won't start:
virsh start Centos6Samba
error: Failed to start domain Centos6Samba
error: unsupported configuration: Domain requires KVM, but it is not available. Check that virtualization is enabled in the host BIOS, and host configuration is setup to load the kvm modules.

I have an AMD machine and virtualization is enabled:
grep svm /proc/cpuinfo
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt arat cpb hw_pstate npt lbrv svm_lock nrip_save pausefilter

KVM is built into the kernel (not a module):
zgrep -i "kvm\|virtualiz" /proc/config
CONFIG_HAVE_KVM=y
CONFIG_VIRTUALIZATION=y

libvirtd is running:
ps -Af | grep [l]ibvirt
root 2039 1 4 19:45 ? 00:01:03 /usr/sbin/libvirtd -d

Why won't the KVM domains start?

[bbgermany]

Hi,

you need the KVM_AMD for your System as well. You need to enabel at least CONFIG_KVM_AMD in your Kernelconfig for getting this running.

bb
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[mgnut57]

[Hu]

The solution from bbgermany is correct. The symbol CONFIG_HAVE_KVM means that the architecture is capable of enabling KVM, not that KVM is enabled.