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    Subject[PATCH 4.14 039/496] powerpc/rfi-flush: Always enable fallback flush on pseries
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    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
    @@ -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);

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