virtualbox-kvm
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cyberus-technology
Required capability 'KVM_CAP_KVM_CAP_XCRS' is missing!
Bug Description
When I try to run a VM, I get the following message: Required capability 'KVM_CAP_KVM_CAP_XCRS' is missing! (VERR_NEM_MISSING_FEATURE).
How to Reproduce
Compile and try to run a VM on an Intel Core2 Duo.
VM configuration
Guest OS configuration details:
- I set up a test VM with the DOS profile
- test.vbox.txt
Host OS details:
- Trisquel 11.0 (Based on Ubuntu 22.04)
- 5.15.0-92-generic
Logs
Following logs are required:
Unfortunately, your Intel P8600 CPU does not support the XSAVE instruction which is currently a requirement to run VirtualBox with our KVM backend.
Thanks a lot for the quick response!
I tried it also on another laptop I have, but I'm getting the same error with an Intel Core i5 M 460 CPU. dmesg.txt test-2024-02-09-21-22-43.log
It would be great if more CPUs could be supported in the future!
Intel Core i5 M 460 is Nehalem (microarchitecture) which also does not support XSAVE.
Currently, you need at least Sandy Bridge (2nd generation Core Processors) in order to use VirtualBox with KVM. Supporting older systems without XSAVE is certainly possible, but it's not on our agenda right now.
Alright, thanks for the info! It seems you are politely saying all my CPUs are old.. :)
Is XSAVE indeed the one and only thing that prevents all these older CPUs from working?
Alright, thanks for the info! It seems you are politely saying all my CPUs are old.. :)
:smile:
XSAVE should be the only thing ... can't give you 100% on this though since I've never tested anything older than Ivy Bridge (3rd Gen Core).
Just to let everyone know, we have now included more information in the readme. Feel free to have a look and let us know if that clarifies things!
Just to let everyone know, we have now included more information in the readme. Feel free to have a look and let us know if that clarifies things!
I think the main issue is Intel's marketing. Now this is written "This implies a 2nd Gen Core processor or newer.", but Intel Core2 Duo is not a 2nd gen core processor despite the 2 and the Duo :) If nobody else will bring this up, I think everything's fine, otherwise I hope there can be other ways to describe this better to prevent you from getting asked about this over and over.
(Myself I'm in the category that believes i7 is always faster than i5. When somebody would talk about Haswell i5 versus Sandy or Ivy, I presume an i5 could be faster than an i7 if they are from different generations, but I'd have no clue.)