Il 19/03/2014 17:58, Waiman Long ha scritto:
Exactly. What you want is boot_cpu_has(X86_FEATURE_HYPERVISOR).
The unfair lock is to be enabled by boot time check, not just by the
presence of a configuration macro during the build process in order to
avoid using unfair lock on bare metal. Of course, Linux distros can
modify this if that suits their need.
"boot_cpu_has" is a run-time check. You can use it after setup_arch has
called init_hypervisor_platform and kvm_guest_init. Can you just just
check if the PV path has been enabled and, if not, do a static_key_inc
to enable the unfair path?
Paolo
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