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Fix hypervisor sub-leaf handling

Ludovico de Nittis requested to merge wip/sonicadvance1/cpuid_sub_leaf into master

  • cpu-feature: Add support for CPUID subleaf functions

    Unlike __get_cpuid there isn't a __get_cpuid_count in the version of GCC used to compile. Rely on __cpuid_count exclusively.

  • virtualization: Correctly get hypervisor sub-leaf

    Without setting the sub-leaf explicitly, garbage data would end up in ECX. This was causing pressure-vessel to not be able to fetch the host machine type correctly.

    I missed this in my first pass through the code.

Fixes #93 (closed)

@Sonicadvance1 I created the MR for you.

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