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    SubjectRe: [PATCH 3/3] x86, AMD: Disable wrongly set X86_FEATURE_LAHF_LM CPUID bit
    On Sun, Aug 30, 2009 at 12:22:34PM -0700, H. Peter Anvin wrote:
    > On 08/30/2009 04:50 AM, Borislav Petkov wrote:
    > > clear_cpu_cap(c, X86_FEATURE_LAHF_LM);
    > > + if (!rdmsrl_amd_safe(0xc001100d, &val)) {
    > > + val &= ~(1ULL << 32);
    > > + wrmsr_amd_safe(0xc001100d, (u32) val,
    > > + (u32)(val >> 32));
    > > + }
    > > + }
    >
    > We presumably want/need wrmsrl_amd_safe() here!

    Actually, it is wrmsr_amd_safe() because we need the magic value in
    %edi. wrmsr_amd_safe() calls the _regs variant with the array argument.
    And we don't have a wrmsrl_amd_safe-one which gets a 64bit msr value as
    an argument similar to the rdmsrl one.

    --
    Regards/Gruss,
    Boris.


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