linux-kernel - Re: [PATCH v4 2/2] KVM: move vcpu id checking to archs

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Message-ID: <20160422131957.6419a696@nial.brq.redhat.com>
Date:	Fri, 22 Apr 2016 13:19:57 +0200
From:	Igor Mammedov <imammedo@...hat.com>
To:	Greg Kurz <gkurz@...ux.vnet.ibm.com>
Cc:	Radim Krčmář <rkrcmar@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>, james.hogan@...tec.com,
	mingo@...hat.com, linux-mips@...ux-mips.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	David Hildenbrand <dahi@...ux.vnet.ibm.com>,
	qemu-ppc@...gnu.org, Cornelia Huck <cornelia.huck@...ibm.com>,
	Paul Mackerras <paulus@...ba.org>,
	David Gibson <david@...son.dropbear.id.au>
Subject: Re: [PATCH v4 2/2] KVM: move vcpu id checking to archs

On Fri, 22 Apr 2016 11:25:38 +0200
Greg Kurz <gkurz@...ux.vnet.ibm.com> wrote:

> Hi Radim !
> 
> On Thu, 21 Apr 2016 19:36:11 +0200
> Radim Krčmář <rkrcmar@...hat.com> wrote:
> 
> > 2016-04-21 18:45+0200, Greg Kurz:  
> > > On Thu, 21 Apr 2016 18:00:19 +0200
> > > Radim Krčmář <rkrcmar@...hat.com> wrote:    
> > >> 2016-04-21 16:20+0200, Greg Kurz:    
[...]
> > >                                                                      maybe later
> > > if we have other scenarios where vcpu ids need to cross the limit ?    
> > 
> > x86 is going to have that soon too -- vcpu_id will be able to range from
> > 0 to 2^32-1 (or 2^31), but MAX_CPUS related data structures probably
> > won't be improved to actually scale, so MAX_CPUS will remain lower.
> >  
That's not true, x86 is going to stick with KVM_MAX_VCPUS/qemu's max_cpus,
the only thing that is going to change is that max supported APIC ID
value will be in range 0 to 2^32-1 vs current 8bit one
and since APIC ID is not vcpu_id so it won't affect vcpu_id.
 
> 
> Do you have some pointers to share so that we can see the broader picture ?
> 
> Thanks !
> 
> --
> Greg
> 
> --
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