x86/domctl: Implement XEN_DOMCTL_set_cpumsr_policy

x86/domctl: Implement XEN_DOMCTL_set_cpumsr_policy

This hypercall allows the toolstack to present one combined CPUID and MSR
policy for a domain, which can be audited in one go by Xen, which is necessary
for correctness of the auditing.

Reuse the existing set_cpuid XSM access vector, as this is logically the same
operation.

As x86_cpu_policies_are_compatible() is still only a stub, retain the call to
recalculate_cpuid_policy() to discard unsafe toolstack settings.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Sergey Dyasli <sergey.dyasli@citrix.com>
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Release-acked-by: Juergen Gross <jgross@suse.com>