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Igor Druzhinin
9835246710
TLFS 7.8.1 stipulates that "a virtual processor index must be less than the maximum number of virtual processors per partition" that "can be obtained through CPUID leaf 0x40000005". Furthermore, "Requirements for Implementing the Microsoft Hypervisor Interface" defines that starting from Windows Server 2012, which allowed more than 64 CPUs to be brought up, this leaf can now contain a value -1 basically assuming the hypervisor has no restriction while 0 (that we currently expose) means the default restriction is still present. Along with the previous changes exposing ExProcessorMasks this allows a recent Windows VM with Viridian extension enabled to have more than 64 vCPUs without going into BSOD in some cases. Since we didn't expose the leaf before and to keep CPUID data consistent for incoming streams from previous Xen versions - let's keep it behind an option. Signed-off-by: Igor Druzhinin <igor.druzhinin@citrix.com> Reviewed-by: Paul Durrant <paul@xen.org> Acked-by: Anthony PERARD <anthony.perard@citrix.com>