powerpc/pseries: Support firmware disable of RFI flush

commit 582605a429e20ae68fd0b041b2e840af296edd08 upstream.

Some versions of firmware will have a setting that can be configured
to disable the RFI flush, add support for it.

Fixes: 8989d56878a7 ("powerpc/pseries: Query hypervisor for RFI flush settings")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index ae4f596..8bbbb4e 100644 (file)
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -482,7 +482,8 @@ static void pseries_setup_rfi_flush(void)
                if (types == L1D_FLUSH_NONE)
                        types = L1D_FLUSH_FALLBACK;
 
-               if (!(result.behaviour & H_CPU_BEHAV_L1D_FLUSH_PR))
+               if ((!(result.behaviour & H_CPU_BEHAV_L1D_FLUSH_PR)) ||
+                   (!(result.behaviour & H_CPU_BEHAV_FAVOUR_SECURITY)))
                        enable = false;
        } else {
                /* Default to fallback if case hcall is not available */