[libvirt] [PATCH] treat host models as case-insensitive strings

Scott Garfinkle scottgar at linux.vnet.ibm.com
Tue Dec 19 20:24:47 UTC 2017

On Tue, 2017-12-19 at 20:05 +0100, Jiri Denemark wrote:
> On Tue, Dec 19, 2017 at 12:39:26 -0600, Scott Garfinkle wrote:
> > Qemu now allows case-insensitive specification of CPU models. This fixes the
> > resulting problems on POWER arch machines. I believe a similar change is needed
> > in src/cpu/cpu_x86.c but I don't have a way to test this.
> I believe this change is not needed or even acceptable at all. What kind
> of issue are you trying to solve?
So, the problem is that as of qemu 2.11, Power arch guests don't start,
since libvirt ppc code is looking for the string POWER to determine
whether the system supports the model at hand. 
Comment from our qemu maintainer: "There was a rework in QEMU side to
allow case-insensitive specification of CPU models. As a side-effect of
that some models no longer show up as all caps in -cpu ? /
query-cpu-definitions. This requires libvirt changes to avoid relying on
specific capitalized models."
Are you concerned that we SHOULD be looking for case-sensitive models in
libvirt? Is this a problem absent qemu?


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