- Revert a bogus, made-up nested SVM consistency check for TLB_CONTROL.
- Advertise flush-by-ASID support for nSVM unconditionally, as KVM always
flushes on nested transitions, i.e. always satisfies flush requests. This
allows running bleeding edge versions of VMware Workstation on top of KVM.
- Sanity check that the CPU supports flush-by-ASID when enabling SEV support.
- Fix a benign NMI virtualization bug where KVM would unnecessarily intercept
IRET when manually injecting an NMI, e.g. when KVM pends an NMI and injects
a second, "simultaneous" NMI.