On Sat, 2018-01-20 at 20:22 +0100, KarimAllah Ahmed wrote: > > @@ -6791,6 +6792,9 @@ static __init int hardware_setup(void) > kvm_tsc_scaling_ratio_frac_bits = 48; > } > > + if (boot_cpu_has(X86_FEATURE_SPEC_CTRL)) > + vmx_disable_intercept_for_msr(MSR_IA32_PRED_CMD, false); > + I've updated that to allow X86_FEATURE_AMD_PRED_CMD too, since some hypervisors may expose *only* that MSR to guests even on Intel hardware. PRED_CMD is a lot easier to expose as it doesn't need storage, live migration support, and all that crap. Our shared tree at http://git.infradead.org/linux-retpoline.git/shortlog/refs/heads/ibpb updated accordingly.
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