[PATCH v3 3/5] rfi-flush: Always enable fallback flush on pseries
From: Mauricio Faria de Oliveira <hidden>
Date: 2018-03-14 22:41:00
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
From: Michael Ellerman <mpe@ellerman.id.au> This ensures the fallback flush area is always allocated on pseries, so in case a LPAR is migrated from a patched to an unpatched system, it is possible to enable the fallback flush in the target system. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Mauricio Faria de Oliveira <redacted> --- arch/powerpc/platforms/pseries/setup.c | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-)
diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index 4642e48..b20d107 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c@@ -468,26 +468,18 @@ static void pseries_setup_rfi_flush(void) /* Enable by default */ enable = true; + types = L1D_FLUSH_FALLBACK; rc = plpar_get_cpu_characteristics(&result); if (rc == H_SUCCESS) { - types = L1D_FLUSH_NONE; - if (result.character & H_CPU_CHAR_L1D_FLUSH_TRIG2) types |= L1D_FLUSH_MTTRIG; if (result.character & H_CPU_CHAR_L1D_FLUSH_ORI30) types |= L1D_FLUSH_ORI; - /* Use fallback if nothing set in hcall */ - if (types == L1D_FLUSH_NONE) - types = L1D_FLUSH_FALLBACK; - 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 */ - types = L1D_FLUSH_FALLBACK; } setup_rfi_flush(types, enable);
--
2.7.4