Messages in this thread | | | Subject | Re: [PATCH v6 10/34] x86, x86/mm, x86/xen, olpc: Use __va() against just the physical address in cr3 | From | Boris Ostrovsky <> | Date | Thu, 8 Jun 2017 17:17:29 -0400 |
| |
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
| |