[Qemu-devel] Re: [PATCH] qemu-kvm: Switch to upstream -enable-kvm semantics

[Markus Armbruster <armbru@redhat.com>]

Avi Kivity <avi@redhat.com> writes:

> On 12/15/2010 07:57 PM, Markus Armbruster wrote:
>> >  In the short term, it would be a good idea to modify qemu-kvm to
>> >  switch the -enable-kvm semantics to match upstream (fail if KVM isn't
>> >  available).
>>
>> That's what my patch does.
>>
>> Additionally, it changes the default to match upstream: KVM disabled.
>>
>> What do you want changed in my patch?
>
> The 'Additionally' bit.  qemu-kvm users rely on the default enabling
> kvm.  Likely they don't rely on -enable-kvm failing is kvm is not
> available (and indeed, they likely expect it to match upstream).  So
> the patch should only change behaviour when -enable-kvm is specified.

Like this?

upstream qemu   |  default  |-enable-kvm
----------------+-----------+-----------
KVM available   | disabled  |  enabled
KVM unavailable | disabled  |    fail

qemu-kvm        |  default  |-enable-kvm|  -no-kvm
----------------+-----------+-----------+-----------
KVM available   |  enabled* |  enabled  |  disabled
KVM unavailable | disabled  |    fail   |  disabled

* differs from upstream