qemu fails building EC2 AMI: CPU model ‘host’ requires KVM
#85394
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Oh cool! I missed that. I suppose this can be closed then. Thanks for the link |
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I faced the same issue and reverting was the only option that worked. The proposed solution in #83920 didn't work. Still getting the same error message. |
matthewbauer
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Aug 22, 2020
This appears to avoid requiring KVM when it’s not available. This is what I originally though -cpu host did. Unfortunately not much documentation available from the QEMU side on this, but this appears to square with help: $ qemu-system-x86 -cpu help ... x86 host KVM processor with all supported host features x86 max Enables all features supported by the accelerator in the current host ... Whether we actually want to support this not clear, since this only happens when your CPU doesn’t have full KVM support. Some Nix builders are lying about kvm support though. Things aren’t too slow without it though. Fixes NixOS#85394 Alternative to NixOS#83920
matthewbauer
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Aug 22, 2020
This appears to avoid requiring KVM when it’s not available. This is what I originally though -cpu host did. Unfortunately not much documentation available from the QEMU side on this, but this appears to square with help: $ qemu-system-x86 -cpu help ... x86 host KVM processor with all supported host features x86 max Enables all features supported by the accelerator in the current host ... Whether we actually want to support this not clear, since this only happens when your CPU doesn’t have full KVM support. Some Nix builders are lying about kvm support though. Things aren’t too slow without it though. Fixes NixOS#85394 Alternative to NixOS#83920
matthewbauer
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Feb 25, 2021
This appears to avoid requiring KVM when it’s not available. This is what I originally though -cpu host did. Unfortunately not much documentation available from the QEMU side on this, but this appears to square with help: $ qemu-system-x86 -cpu help ... x86 host KVM processor with all supported host features x86 max Enables all features supported by the accelerator in the current host ... Whether we actually want to support this not clear, since this only happens when your CPU doesn’t have full KVM support. Some Nix builders are lying about kvm support though. Things aren’t too slow without it though. Fixes NixOS#85394 Alternative to NixOS#83920 (cherry picked from commit 47b56e7)
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Describe the bug
When trying to generate an EC2 AMI,
qemufails with:This has been reported by someone else in the NixOS Discourse too: https://discourse.nixos.org/t/new-constraint-between-release-19-09-and-20-03-in-package-qemu/6297
I've tried reverting 2bd296a and it succeeds for me, noting that's the commit that introduced the problem.
To Reproduce
Steps to reproduce the behavior:
Expected behavior
Qemu would succeed in creating a disk image
Notify maintainers
cc @volth who's the author of the referenced commit. I'm not sure what the right fix is here, so would appreciate some guidance.
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