4.9-stable review patch. If anyone has any objections, please let me know.
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From: Michael Ellerman mpe@ellerman.id.au
commit 84749a58b6e382f109abf1e734bc4dd43c2c25bb upstream.
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 mauricfo@linux.vnet.ibm.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/powerpc/platforms/pseries/setup.c | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-)
--- a/arch/powerpc/platforms/pseries/setup.c +++ b/arch/powerpc/platforms/pseries/setup.c @@ -459,26 +459,18 @@ 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);