| From | "Edgecombe, Rick P" <> | Subject | Re: [PATCH 14/29] x86/ibt: Add IBT feature, MSR and #CP handling | Date | Sat, 19 Feb 2022 01:20:24 +0000 |
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On Fri, 2022-02-18 at 17:49 +0100, Peter Zijlstra wrote: > +static __always_inline void setup_cet(struct cpuinfo_x86 *c) > +{ > + u64 msr; > + > + if (!IS_ENABLED(CONFIG_X86_IBT) || > + !cpu_feature_enabled(X86_FEATURE_IBT)) > + return; > + > + cr4_set_bits(X86_CR4_CET); > + > + rdmsrl(MSR_IA32_S_CET, msr); > + if (cpu_feature_enabled(X86_FEATURE_IBT))
It must be true because of the above check.
> + msr |= CET_ENDBR_EN; > + wrmsrl(MSR_IA32_S_CET, msr); > + > + if (!ibt_selftest()) { > + pr_err("IBT selftest: Failed!\n"); > + setup_clear_cpu_cap(X86_FEATURE_IBT); > + } > +} > +
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