Fix confusing log message when checking present hypervisor #422
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When checking if a specific hypervisor is present using for example
kvm::is_hypervisor_present
, and the hypervisor is not present, a log message is printed with the word 'Error' in it, which was confusing since it's not actually an error.The second commit does a slight cleanup by switching to Mshv::new() to avoid having to manually close the fd with raw libc calls.
Closes #379