kvm: svm: Intercept RDPRU

The RDPRU instruction gives the guest read access to the IA32_APERF
MSR and the IA32_MPERF MSR. According to volume 3 of the APM, "When
virtualization is enabled, this instruction can be intercepted by the
Hypervisor. The intercept bit is at VMCB byte offset 10h, bit 14."
Since we don't enumerate the instruction in KVM_SUPPORTED_CPUID,
intercept it and synthesize #UD.

Signed-off-by: Jim Mattson <[email protected]>
Reviewed-by: Drew Schmitt <[email protected]>
Reviewed-by: Jacob Xu <[email protected]>
Reviewed-by: Peter Shier <[email protected]>
Reviewed-by: Krish Sadhukhan <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

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