virt: Support detection for ARM64 Hyper-V guests #20998
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The detection of Microsoft Hyper-V VMs is done by cpuid currently, however there is no cpuid on ARM64. And since ARM64 is now a supported architecture for Microsoft Hyper-V guests[1], then use DMI tables to detect a Hyper-V guest, which is more generic and works for ARM64. [1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7aff79e297ee1aa0126924921fd87a4ae59d2467
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v1 -> v2: Use DMI vendor tables instead of existence of "/dev/vmbus". |
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The detection of Microsoft Hyper-V VMs is done by cpuid currently,
however there is no cpuid on ARM64. And since ARM64 is now a supported
architecture for Microsoft Hyper-V guests1, then introduce a more
generic way to detect whether a guest is running as a Hyper-V guest:
detect via the existence of directory "/dev/vmbus".