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shared features in cpuid

To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
From: Olaf Hering <olaf@xxxxxxxxx>
Date: Fri, 21 Aug 2020 12:12:24 +0200
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
Delivery-date: Fri, 21 Aug 2020 10:12:41 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

While reviewing changed behavior in 'xen-cpuid -d' output between Xen 4.8 and 
4.9 I found commit 20e92c97f904aa460e2223c30dcad36c234496b6 ("x86/cpuid: Only 
recalculate the shared feature bits once").

I wonder what the mentioned "cross-vendor case" in the comment, which was 
removed from sanitise_featureset(), really means.

Does Xen attempt to support domU migration between AMD and Intel hardware?


Olaf

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