On 06/08/2017 05:02 PM, Tom Lendacky wrote: > On 6/8/2017 3:51 PM, Boris Ostrovsky wrote: >> >>> >>>> What may be needed is making sure X86_FEATURE_SME is not set for PV >>>> guests. >>> >>> And that may be something that Xen will need to control through either >>> CPUID or MSR support for the PV guests. >> >> >> Only on newer versions of Xen. On earlier versions (2-3 years old) leaf >> 0x80000007 is passed to the guest unchanged. And so is MSR_K8_SYSCFG. > > The SME feature is in leaf 0x8000001f, is that leaf passed to the guest > unchanged? Oh, I misread the patch where X86_FEATURE_SME is defined. Then all versions, including the current one, pass it unchanged. All that's needed is setup_clear_cpu_cap(X86_FEATURE_SME) in xen_init_capabilities(). -boris -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
