[libvirt] [PATCH v2] treat host models as case-insensitive strings

Scott Garfinkle scottgar at linux.vnet.ibm.com
Thu Jan 11 16:34:22 UTC 2018


On Thu, 2018-01-11 at 11:19 -0500, John Ferlan wrote:
> 
> On 12/26/2017 02:55 PM, Scott Garfinkle wrote:
> > Qemu now allows case-insensitive specification of CPU models. This
> > fixes the resulting problems on (at least) POWER arch machines.
> 
> Would have been great to reference which qemu commit number, but
> there's probably way too many.  Perhaps best to note it's as of QEMU
> 2.11.  My quick search turns up "03c9141d75" and "4a12c699d", is that
> about right?
Thanks, next time I'll try to be more specific. Yes Qemu 2.11. The full
patch series is at
   https://lists.gnu.org/archive/html/qemu-devel/2017-08/msg04651.html

> > 
> > Patch V2: Change only the internal interface. This solves the
> > actual problem at
> > hand of reporting unsupported models now that qemu allows case-
> > insensitive
> > strings (e.g. "Power8" instead of "POWER8").
> 
> This hunk would typically go under the "---" below to give a hint to
> the reviewer about what changed.
ack

> Hopefully no one someday decides POWER8 is more "powerful" than
> Power8 ;-) (couldn't resist).
groan  :-)

> > 
> > Signed-off-by: Scott Garfinkle <scottgar at linux.vnet.ibm.com>
> > ---
> >  src/conf/domain_capabilities.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> 
> This seems like a reasonable way to approach the problem.  I can fix
> up the comment message a bit and will push later... Just want to make
> sure that no one else comes up with a latent concern...  The only
> thing that springs to my mind is migration possibly.
It seems to me that the in the worst we might be more permissive with
the patch than without; I am hopeful for the sake of sanity that nobody
actually has two model names disambiguated only by case!

> Reviewed-by: John Ferlan <jferlan at redhat.com>
> 
> John
> 
> > diff --git a/src/conf/domain_capabilities.c
> > b/src/conf/domain_capabilities.c
> > index e7323a8..f7d9be5 100644
> > --- a/src/conf/domain_capabilities.c
> > +++ b/src/conf/domain_capabilities.c
> > @@ -271,7 +271,7 @@
> > virDomainCapsCPUModelsGet(virDomainCapsCPUModelsPtr cpuModels,
> >          return NULL;
> >  
> >      for (i = 0; i < cpuModels->nmodels; i++) {
> > -        if (STREQ(cpuModels->models[i].name, name))
> > +        if (STRCASEEQ(cpuModels->models[i].name, name))
> >              return cpuModels->models + i;
> >      }
> >  
> > 
> 
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