I have VirtualBox up and running fine with a 32-bit XP image, but when I
tried to configure a 64-bit linux machine VirtualBox barfs when you try
to start it with:

Failed to open a session for the virtual machine linux_test.
AMD-V is being used by another hypervisor. (VERR_SVM_IN_USE).
VirtualBox can't enable the AMD-V extension. Please disable the KVM
kernel extension, recompile your kernel and reboot (VERR_SVM_IN_USE).

Searching for this found a match, but their solution of
   rmmod kvm_amd kvm
I had already tried with modprobe -r and it doesn't fix it anyway.

I've tried with both 3.10.11 and 3.11.2 from fedora.

I am unable to see any kvm that is already running, and - more to the
point - what causes kvm_amd to be loaded in the first place, since rmmod
happily unloads what must be an unused module.

Playing around a bit, VirtualBox says that it turns on the AMD-V option
automatically if a 64-bit VM is selected.

Btw, the .vdi was converted from the raw - a bootable usb stick with a
full blown fedora OS on it.  I can't see that having any relevance as
the error comes up before any boot process has happened.

Suggestions please - I can do a kernel recompile, but what I have to
disable isn't clear.
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