| .. 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. |
