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    Subject[patch V4 14/30] x86/microcode/amd: Read revision from hardware in collect_cpu_info_amd()
    Date
    Prepare to decrapify the core initialization logic which invokes
    microcode_ops::apply_microcode() several times just to set
    cpu_data::microcode.

    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    ---
    V2: New patch
    ---
    arch/x86/kernel/cpu/microcode/amd.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    --- a/arch/x86/kernel/cpu/microcode/amd.c
    +++ b/arch/x86/kernel/cpu/microcode/amd.c
    @@ -634,12 +634,12 @@ void reload_ucode_amd(unsigned int cpu)

    static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
    {
    - struct cpuinfo_x86 *c = &cpu_data(cpu);
    struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
    + u32 dummy __always_unused;
    struct ucode_patch *p;

    csig->sig = cpuid_eax(0x00000001);
    - csig->rev = c->microcode;
    + rdmsr(MSR_AMD64_PATCH_LEVEL, csig->rev, dummy);

    /*
    * a patch could have been loaded early, set uci->mc so that
    \
     
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