1 .. SPDX-License-Identifier: GPL-2.0
2
3 ===============
4 ACRN CPUID bits
5 ===============
6
7 A guest VM running on an ACRN hypervisor can c
8 CPUID.
9
10 ACRN cpuid functions are:
11
12 function: 0x40000000
13
14 returns::
15
16 eax = 0x40000010
17 ebx = 0x4e524341
18 ecx = 0x4e524341
19 edx = 0x4e524341
20
21 Note that this value in ebx, ecx and edx corre
22 "ACRNACRNACRN". The value in eax corresponds t
23 present in this leaf, and will be updated if m
24 future.
25
26 function: define ACRN_CPUID_FEATURES (0x400000
27
28 returns::
29
30 ebx, ecx, edx
31 eax = an OR'ed group of (1 << flag)
32
33 where ``flag`` is defined as below:
34
35 ================================= ===========
36 flag value
37 ================================= ===========
38 ACRN_FEATURE_PRIVILEGED_VM 0
39 ================================= ===========
40
41 function: 0x40000010
42
43 returns::
44
45 ebx, ecx, edx
46 eax = (Virtual) TSC frequency in kHz
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