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XEN_SYSCTL_cpu_policy_hvm_default truncates leaf count

  • To: xen-devel@xxxxxxxxxxxxxxxxxxxx
  • From: Olaf Hering <olaf@xxxxxxxxx>
  • Date: Thu, 1 Jul 2021 12:56:23 +0200
  • Authentication-results: strato.com; dkim=none
  • Delivery-date: Thu, 01 Jul 2021 10:56:53 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

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 
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 


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