Messages in this thread | | | Date | Tue, 22 Feb 2022 10:32:48 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH 14/29] x86/ibt: Add IBT feature, MSR and #CP handling |
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On Tue, Feb 22, 2022 at 04:38:22AM +0000, Edgecombe, Rick P wrote: > 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.
Yeah, no, I'm not touching that.
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