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    SubjectRe: [PATCH v7 03/14] x86/cet/ibt: Add IBT legacy code bitmap setup function
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    On 6/6/19 1:09 PM, Yu-cheng Yu wrote:
    > + modify_fpu_regs_begin();
    > + rdmsrl(MSR_IA32_U_CET, r);
    > + r |= (MSR_IA32_CET_LEG_IW_EN | bitmap);
    > + wrmsrl(MSR_IA32_U_CET, r);
    > + modify_fpu_regs_end();

    Isn't there a bunch of other stuff in this MSR? It seems like the
    bitmap value would allow overwriting lots of bits in the MSR that have
    nothing to do with the bitmap... in a prctl() that's supposed to only be
    dealing with the bitmap.

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