Re: [Xen-devel] [PATCH for-4.11] x86/pv: Unconditionally hide EFER.SVME from PV guests

[Juergen Gross <jgross@xxxxxxxx>]

On 04/05/18 19:28, Andrew Cooper wrote:
> We don't advertise SVM in CPUID so a PV guest shouldn't be under the
> impression that it can use SVM functionality, but despite this, it really
> shouldn't see SVME set when reading EFER.
> 
> Introduce EFER_KNOWN_MASK to whitelist the features Xen knows about, and use
> this to clamp the guests view.
> 
> Take the opportunity to reuse the mask to simplify svm_vmcb_isvalid(), and
> change "undefined" to "unknown" in the print message, as there is at least
> EFER.TCE (Translation Cache Extension) defined but unknown to Xen.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Release-acked-by: Juergen Gross <jgross@xxxxxxxx>

Juergen

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