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i'm trying to run windows 7 as a guest in qemu, and am getting the following error:
kvm: vm entry failed with error 0x80000021
If you're runnning a guest on an Intel machine without
unrestricted mode support, the failure can be most likely
due to the guest entering an invalid state for Intel VT.
For example, the guest maybe running in big real mode
which is not supported on less recent Intel processors.
kvm_run returned -22
The Core2Quad Q9550 supports hardware virtualization for sure. As said above, have a look in your BIOS if it is disabled. If you have a custom kernel it may be disabled there also.
If it is enabled in BIOS and kernel and works with other virtualization environments, like Virtualbox, I would file a bug against qemu.