linux-kernel - Re: [PATCH v2 35/45] KVM: s390: Manually invoke vcpu setup during kvm_arch_vcpu

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Date:   Fri, 20 Dec 2019 08:22:45 -0800
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Cornelia Huck <cohuck@...hat.com>
Cc:     Marc Zyngier <maz@...nel.org>, James Hogan <jhogan@...nel.org>,
        Paul Mackerras <paulus@...abs.org>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        David Hildenbrand <david@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-mips@...r.kernel.org, kvm-ppc@...r.kernel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kurz <groug@...d.org>
Subject: Re: [PATCH v2 35/45] KVM: s390: Manually invoke vcpu setup during
 kvm_arch_vcpu_create()

On Fri, Dec 20, 2019 at 05:02:46PM +0100, Cornelia Huck wrote:
> On Fri, 20 Dec 2019 07:56:07 -0800
> Sean Christopherson <sean.j.christopherson@...el.com> wrote:
> 
> > On Fri, Dec 20, 2019 at 11:04:45AM +0100, Cornelia Huck wrote:
> > > On Wed, 18 Dec 2019 13:55:20 -0800
> > > Sean Christopherson <sean.j.christopherson@...el.com> wrote:
> > >   
> > > > Rename kvm_arch_vcpu_setup() to kvm_s390_vcpu_setup() and manually call
> > > > the new function during kvm_arch_vcpu_create().  Define an empty
> > > > kvm_arch_vcpu_setup() as it's still required for compilation.  This
> > > > is effectively a nop as kvm_arch_vcpu_create() and kvm_arch_vcpu_setup()
> > > > are called back-to-back by common KVM code.  Obsoleting
> > > > kvm_arch_vcpu_setup() paves the way for its removal.
> > > > 
> > > > Note, gmap_remove() is now called if setup fails, as s390 was previously
> > > > freeing it via kvm_arch_vcpu_destroy(), which is called by common KVM
> > > > code if kvm_arch_vcpu_setup() fails.  
> > > 
> > > Yes, this looks like the only thing that needs to be undone
> > > (sca_add_vcpu() is done later in the process.)
> > > 
> > > Maybe mention that gmap_remove() is for ucontrol only? I was confused
> > > for a moment :)  
> > 
> > Will do.
> > 
> > Would it also make sense to open code __kvm_ucontrol_vcpu_init() in a
> > separate patch immediately preceding this change?  That'd make it a little
> > more obvious why gmap_remove() is called, and it would eliminate the
> > "uninit" verbiage in the label, e.g.:
> 
> I'm a bit undecided here; especially as I'm not sure if there are any
> future plans with ucontrol. I'll leave that for Christian and Janosch
> to decide.

Sounds good.  Thanks for the reviews!