Since commit 6b85e427098cce1a6d386b3bae2f0c7ce86e47f7 'xen-cpuid -p' shows the cpuid policies. I think these policies define what a domU will get to see when cpuid() is invoked, or when MSRs are accessed.
Unfortunately this commit shows only the raw hex values, which makes it difficult to compare output from different physical hosts. I think the actual policy values could be shown in expanded form, similar to what 'xen-cpuid -d' would show. Did you ever consider to show the expanded form for policies? Olaf
pgp8pOX1zh4jX.pgp
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