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In the next user survey - could we clarify that qemu == full software cpu emulation and kvm (qemu/kvm) = hardware accelerated virtualization or some similar phrasing.  It's totally possible that people are like: I run both qemu and kvm (thinking that’s qemu/kvm) - when in fact they only run kvm (qemu/kvm).

___________________________________________________________________
Kris Lindgren
Senior Linux Systems Engineer
GoDaddy







On 5/11/16, 11:58 AM, "Tim Bell" <Tim.Bell at cern.ch> wrote:

>Does anyone see a good way to fix this to report KVM or QEMU/KVM ?
>
>I guess the worry is whether this would count as a bug fix or an incompatible change.
>
>Tim
>
>On 11/05/16 17:51, "Kashyap Chamarthy" <kchamart at redhat.com> wrote:
>
>>On Tue, May 03, 2016 at 02:27:00PM -0500, Sergio Cuellar Valdes wrote:
>>
>>[...]
>>
>>> I'm confused too about the use of KVM or QEMU In the computes the
>>> file​/etc/nova/nova-compute.conf has:
>>> 
>>> virt_type=kvm
>>> 
>>> The output of:
>>> 
>>> nova hypervisor-show <id> | grep hypervisor_type
>>> 
>>> is:
>>> 
>>> hypervisor_type           | QEMU
>>
>>As Dan noted in his response, it's because it is reporting the libvirt driver
>>name (which is reported as QEMU).
>>
>>Refer below if you want to double-confirm if your instances are using KVM.
>>
>>> 
>>> The virsh dumpxml of the instances shows:
>>> 
>>> <domain type='kvm' id='44'>
>>
>>That means, yes, you using KVM.  You can confirm that by checking your QEMU
>>command-line of the Nova instance, you'll see something like "accel=kvm":
>>
>>	# This is on Fedora 23 system
>>	$ ps -ef | grep -i qemu-system-x86_64
>>	[...] /usr/bin/qemu-system-x86_64 -machine accel=kvm [...]
>>
>>> ....
>>> <emulator>/usr/bin/qemu-system-x86_64</emulator>
>>> 
>>> ​But according to ​this document [1], it is using QEMU emulator instead of
>>> KVM, because it is not using /usr/bin/qemu-kvm
>>>
>>> 
>>> So I really don't know if it's using KVM or QEMU.
>>
>>As noted above, a sure-fire way to know is to see if the instance's QEMU
>>command-line has "accel=kvm".
>>
>>A related useful tool is `virt-host-validate` (which is part of libvirt-client
>>package, at least on Fedora-based systems):
>>
>>   $ virt-host-validate | egrep -i 'kvm'
>>    QEMU: Checking if device /dev/kvm exists                                   : PASS
>>    QEMU: Checking if device /dev/kvm is accessible                            : PASS
>>
>>
>>> [1] https://libvirt.org/drvqemu.html
>>> 
>>
>>
>>-- 
>>/kashyap
>>
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