x86/srso: Add IBPB on VMEXIT
Add the option to flush IBPB only on VMEXIT in order to protect from
malicious guests but one otherwise trusts the software that runs on the
hypervisor.
Signed-off-by: 
Borislav Petkov (AMD) <bp@alien8.de>
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Add the option to flush IBPB only on VMEXIT in order to protect from
malicious guests but one otherwise trusts the software that runs on the
hypervisor.
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>