cpuid-dump should print hypervisor leaves (0x40000000) #349
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Per https://en.wikipedia.org/wiki/CPUID#EAX=4000'0000h-4FFFF'FFFh:_Reserved_for_Hypervisors: > CPUID leaves 40000000h to 4FFFFFFFh are not implemented in hardware, and > are reserved for use by hypervisors to provide hypervisor-specific > identification and feature information through this interception > mechanism. > > For leaf 40000000h, the hypervisor is expected to return the index of the > highest supported hypervisor CPUID leaf in EAX, and a 12-character > hypervisor ID string in EBX,ECX,EDX (in that order). For leaf 40000001h, > the hypervisor may return an interface identification signature in EAX - > e.g. hypervisors that wish to advertise that they are Hyper-V compatible > may return 0x31237648—"Hv#1" in EAX. For example, running with user-mode QEMU: ``` $ qemu-x86_64 cpuid-dump … CPUID 40000000: 40000001-54474354-43544743-47435447 [TCGTCGTCGTCG] CPUID 40000001: 00000000-00000000-00000000-00000000 … ``` Running under a recent version of WSL2 (Microsoft Hyper-V): ``` $ cpuid-dump … CPUID 40000000: 4000000B-7263694D-666F736F-76482074 [Microsoft Hv] CPUID 40000001: 31237648-00000000-00000000-00000000 [Hv#1] … CPUID 4000000B: 00000000-00000000-00000000-00000000 ```
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Per https://en.wikipedia.org/wiki/CPUID#EAX=4000'0000h-4FFFF'FFFh:_Reserved_for_Hypervisors:
For example, running with user-mode QEMU:
Running under a recent version of WSL2 (Microsoft Hyper-V):