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rralf
n00b
Joined: 10 Jun 2012
Posts: 9
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 Posted: Wed Dec 19, 2012 3:11 pm Post subject: Disable KVM Support for QEMU |
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Hi!
Is it possible to disable KVM support for qemu? My system doesn't support VT, so i don't need and want KVM.
When trying to start my VM, qemu complains:
# qemu-kvm
Could not access KVM kernel module: No such file or directory
failed to initialize KVM: No such file or directory
No accelerator found!
# qemu-system-x86_64 1
Could not access KVM kernel module: No such file or directory
failed to initialize KVM: No such file or directory
No accelerator found!
There's no useflag KVM for qemu, so how may i disable it?
Thanks in advance! |
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rralf
n00b
Joined: 10 Jun 2012
Posts: 9
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| Posted: Wed Dec 19, 2012 5:00 pm Post subject: |
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Got the solution:
There's a (undocumented) -no-kvm CMDline switch.
In my opinion, there should be a KVM useflag for qemu, being disabled at default.
kvm should be opt-in. |
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Etal
Veteran
Joined: 15 Jul 2005
Posts: 1931
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| Posted: Wed Dec 19, 2012 5:34 pm Post subject: |
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Not exactly undocumented...
| Quote: | $ qemu-kvm --help | grep no-kvm
-no-kvm disable KVM hardware virtualization
-no-kvm-irqchip disable KVM kernel mode PIC/IOAPIC/LAPIC
-no-kvm-pit disable KVM kernel mode PIT
-no-kvm-pit-reinjection |
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Hu
Moderator
Joined: 06 Mar 2007
Posts: 20747
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| Posted: Thu Dec 20, 2012 1:16 am Post subject: |
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| rralf wrote: | In my opinion, there should be a KVM useflag for qemu, being disabled at default.
kvm should be opt-in. |
I disagree. Most CPUs sold these days have support for VT-x / SVM, so disabling it by default because some users cannot use it is overkill. If there are specific libraries that are only used when KVM is enabled, then a USE flag might be appropriate, but it should still default to enabling KVM unless the system administrator sets otherwise. |
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Kernel & Hardware
