x86/cpu, kvm: Propagate the AMD Automatic IBRS feature to the guest

Add the AMD Automatic IBRS feature bit to those being propagated to the guest,
and enable the guest EFER bit.

Signed-off-by: Kim Phillips <kim.phillips@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230116230159.1511393-8-kim.phillips@amd.com
3 files changed