It may make sense to expand this a bit as it is probably unclear how the
change is related to SVM.
Something like:
HYPERV_CPUID_NESTED_FEATURES CPUID leaf can be present on both Intel and
AMD Hyper-V guests. Previously, the code was using
HV_X64_ENLIGHTENED_VMCS_RECOMMENDED feature bit to determine the
availability of nested features leaf and this complies to TLFS:
"Recommend a nested hypervisor using the enlightened VMCS interface.
Also indicates that additional nested enlightenments may be available
(see leaf 0x4000000A)". Enlightened VMCS, however, is an Intel only
feature so the detection method doesn't work for AMD. Use
HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS.EAX CPUID information ("The
maximum input value for hypervisor CPUID information.") instead, this
works for both AMD and Intel.
Thanks for the input. Will update the commit message in next revision.
Thanks,
Vineeth
