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SubjectRe: [PATCH 14/29] x86/ibt: Add IBT feature, MSR and #CP handling
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On Fri, 2022-02-18 at 17:49 +0100, Peter Zijlstra wrote:
> + cr4_set_bits(X86_CR4_CET);
> +
> + rdmsrl(MSR_IA32_S_CET, msr);
> + if (cpu_feature_enabled(X86_FEATURE_IBT))
> + msr |= CET_ENDBR_EN;
> + wrmsrl(MSR_IA32_S_CET, msr);

So I guess implicit in all of this is that MSR_IA32_S_CET will not be
managed by xsaves (makes sense).

But it still might be good to add the supervisor cet xfeature number to
XFEATURE_MASK_SUPERVISOR_UNSUPPORTED, with analogous reasoning to
XFEATURE_MASK_PT.

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