XEN_SYSCTL_cpu_policy_hvm_default truncates leaf count

[Olaf Hering <olaf@xxxxxxxxx>]

For some reason migration of HVM domUs from pre-4.14 to staging is broken.

It seems xc_cpuid_apply_policy gets nr_leaves=119 from 
XEN_SYSCTL_get_cpu_policy.
Later XEN_SYSCTL_cpu_policy_hvm_default truncates this value to 31.
As a result x86_cpuid_copy_to_buffer returns -ENOBUFS. It would copy up to 51 
leaves in my testing.

I suspect commit 34990446ca91d9e201ff17bd4e3f43bfe3ad308e just revealed a logic 
error somewhere.

What is supposed to happen in libxl__srm_callout_callback_static_data_done when 
XGR_SDD_MISSING_CPUID is set?

Olaf

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