tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1.. SPDX-License-Identifier: GPL-2.0
2
3===============
4ACRN CPUID bits
5===============
6
7A guest VM running on an ACRN hypervisor can check some of its features using
8CPUID.
9
10ACRN cpuid functions are:
11
12function: 0x40000000
13
14returns::
15
16 eax = 0x40000010
17 ebx = 0x4e524341
18 ecx = 0x4e524341
19 edx = 0x4e524341
20
21Note that this value in ebx, ecx and edx corresponds to the string
22"ACRNACRNACRN". The value in eax corresponds to the maximum cpuid function
23present in this leaf, and will be updated if more functions are added in the
24future.
25
26function: define ACRN_CPUID_FEATURES (0x40000001)
27
28returns::
29
30 ebx, ecx, edx
31 eax = an OR'ed group of (1 << flag)
32
33where ``flag`` is defined as below:
34
35================================= =========== ================================
36flag value meaning
37================================= =========== ================================
38ACRN_FEATURE_PRIVILEGED_VM 0 guest VM is a privileged VM
39================================= =========== ================================
40
41function: 0x40000010
42
43returns::
44
45 ebx, ecx, edx
46 eax = (Virtual) TSC frequency in kHz.