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    Subject[PATCH 4.19 53/68] x86/CPU/AMD: Set the CPB bit unconditionally on F17h
    Date
    4.19-stable review patch.  If anyone has any objections, please let me know.

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

    From: Jiaxun Yang <jiaxun.yang@flygoat.com>

    commit 0237199186e7a4aa5310741f0a6498a20c820fd7 upstream.

    Some F17h models do not have CPB set in CPUID even though the CPU
    supports it. Set the feature bit unconditionally on all F17h.

    [ bp: Rewrite commit message and patch. ]

    Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
    Signed-off-by: Borislav Petkov <bp@suse.de>
    Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Sherry Hurwitz <sherry.hurwitz@amd.com>
    Cc: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: x86-ml <x86@kernel.org>
    Link: https://lkml.kernel.org/r/20181120030018.5185-1-jiaxun.yang@flygoat.com
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/x86/kernel/cpu/amd.c | 8 +++-----
    1 file changed, 3 insertions(+), 5 deletions(-)

    --- a/arch/x86/kernel/cpu/amd.c
    +++ b/arch/x86/kernel/cpu/amd.c
    @@ -818,11 +818,9 @@ static void init_amd_bd(struct cpuinfo_x
    static void init_amd_zn(struct cpuinfo_x86 *c)
    {
    set_cpu_cap(c, X86_FEATURE_ZEN);
    - /*
    - * Fix erratum 1076: CPB feature bit not being set in CPUID. It affects
    - * all up to and including B1.
    - */
    - if (c->x86_model <= 1 && c->x86_stepping <= 1)
    +
    + /* Fix erratum 1076: CPB feature bit not being set in CPUID. */
    + if (!cpu_has(c, X86_FEATURE_CPB))
    set_cpu_cap(c, X86_FEATURE_CPB);
    }


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