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Date: Wed, 13 Jun 2018 21:22:10 +0300
From: "Michael S. Tsirkin" <mst@redhat.com>
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Subject: Re: [Qemu-devel] [RFC untested PATCH] i386/cpu: make -cpu host
 support monitor/mwait
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To: Igor Mammedov <imammedo@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>, qemu-devel@nongnu.org, Paolo Bonzini <pbonzini@redhat.com>, Richard Henderson <rth@twiddle.net>

On Wed, Jun 13, 2018 at 10:55:43AM +0200, Igor Mammedov wrote:
> On Tue, 12 Jun 2018 11:49:22 -0300
> Eduardo Habkost <ehabkost@redhat.com> wrote:
> 
> > On Tue, Jun 12, 2018 at 03:58:03PM +0200, Igor Mammedov wrote:
> > [...]
> > > > > > +    if (xcc->host_cpuid_required && enable_cpu_pm) {
> > > > > > +        host_cpuid(5, 0, &cpu->mwait.eax, &cpu->mwait.ebx,
> > > > > > +                   &cpu->mwait.ecx, &cpu->mwait.edx);
> > > > > > +    }    
> [...]
> > > > > also max_x86_cpu_initfn() might be better place for filling it up.  
> > 
> > Why?
> I've missed 'enable_cpu_pm' which is probably a property,
> so yep it can't go into initfn.
> 
> However if we not going to migrate this state or use outside of
> cpu_x86_cpuid(), I don't see why we should add it to X86CPU state
> and keep around.
> We can query it on demand from cpu_x86_cpuid() like we do for
> PMU leaf.

We can do it but the annoying thing is that it spreads
the info around as we also need to set CPUID_EXT_MONITOR.

This way we set all the info in one place on realize.

-- 
MST