[Qemu-devel] KVM: completely support cpuid functions 2, 4, b, d

[Amit Shah]

These patches add support for cpuid functions 2, 4, 0xb, 0xd. cpuid function
2 keeps returning values till we get a 0. The others take a 'count' parameter
in addition to the function number.

With these patches, KVM can run a VM started with a newer CPU type (coreduo,
core2duo). These patches also pave way for a "host" CPU type, where we could
pass the CPU type of the current host to the VM.

Please apply.