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- .. SPDX-License-Identifier: GPL-2.0
- ===============
- ACRN CPUID bits
- ===============
- A guest VM running on an ACRN hypervisor can check some of its features using
- CPUID.
- ACRN cpuid functions are:
- function: 0x40000000
- returns::
- eax = 0x40000010
- ebx = 0x4e524341
- ecx = 0x4e524341
- edx = 0x4e524341
- Note that this value in ebx, ecx and edx corresponds to the string
- "ACRNACRNACRN". The value in eax corresponds to the maximum cpuid function
- present in this leaf, and will be updated if more functions are added in the
- future.
- function: define ACRN_CPUID_FEATURES (0x40000001)
- returns::
- ebx, ecx, edx
- eax = an OR'ed group of (1 << flag)
- where ``flag`` is defined as below:
- ================================= =========== ================================
- flag value meaning
- ================================= =========== ================================
- ACRN_FEATURE_PRIVILEGED_VM 0 guest VM is a privileged VM
- ================================= =========== ================================
- function: 0x40000010
- returns::
- ebx, ecx, edx
- eax = (Virtual) TSC frequency in kHz.
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