x86/kvm: Add static key for flush always
Avoid the conditional in the L1D flush control path. Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Tested-by: NJiri Kosina <jkosina@suse.cz> Reviewed-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: NJosh Poimboeuf <jpoimboe@redhat.com> Link: https://lkml.kernel.org/r/20180713142322.790914912@linutronix.de
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