linux-kernel - Re: [PATCH v2 15/45] KVM: PPC: Move kvm_vcpu

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Date:   Tue, 21 Jan 2020 12:08:01 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Paul Mackerras <paulus@...abs.org>,
        Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Marc Zyngier <maz@...nel.org>, James Hogan <jhogan@...nel.org>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        David Hildenbrand <david@...hat.com>,
        Cornelia Huck <cohuck@...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 15/45] KVM: PPC: Move kvm_vcpu_init() invocation to
 common code

On 20/01/20 04:34, Paul Mackerras wrote:
> On Wed, Dec 18, 2019 at 01:55:00PM -0800, Sean Christopherson wrote:
>> Move the kvm_cpu_{un}init() calls to common PPC code as an intermediate
>> step towards removing kvm_cpu_{un}init() altogether.
>>
>> No functional change intended.
>>
>> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> 
> This doesn't compile:
> 
>   CC [M]  arch/powerpc/kvm/book3s.o
> /home/paulus/kernel/kvm/arch/powerpc/kvm/book3s.c: In function ‘kvmppc_core_vcpu_create’:
> /home/paulus/kernel/kvm/arch/powerpc/kvm/book3s.c:794:9: error: ‘kvm’ undeclared (first use in this function)
>   return kvm->arch.kvm_ops->vcpu_create(vcpu);
>          ^
> /home/paulus/kernel/kvm/arch/powerpc/kvm/book3s.c:794:9: note: each undeclared identifier is reported only once for each function it appears in
> /home/paulus/kernel/kvm/arch/powerpc/kvm/book3s.c:795:1: warning: control reaches end of non-void function [-Wreturn-type]
>  }
>  ^
> make[3]: *** [/home/paulus/kernel/kvm/scripts/Makefile.build:266: arch/powerpc/kvm/book3s.o] Error 1
> 
>> diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
>> index 13385656b90d..5ad20fc0c6a1 100644
>> --- a/arch/powerpc/kvm/book3s.c
>> +++ b/arch/powerpc/kvm/book3s.c
>> @@ -789,10 +789,9 @@ void kvmppc_decrementer_func(struct kvm_vcpu *vcpu)
>>  	kvm_vcpu_kick(vcpu);
>>  }
>>  
>> -int kvmppc_core_vcpu_create(struct kvm *kvm, struct kvm_vcpu *vcpu,
>> -			    unsigned int id)
>> +int kvmppc_core_vcpu_create(struct kvm_vcpu *vcpu)
>>  {
>> -	return kvm->arch.kvm_ops->vcpu_create(kvm, vcpu, id);
>> +	return kvm->arch.kvm_ops->vcpu_create(vcpu);
> 
> Needs s/kvm/vcpu->kvm/ here.
> 
> You also need to change the declaration of the vcpu_create function
> pointer in the kvmppc_ops struct in kvm_ppc.h to have just the vcpu
> parameter instead of 3 parameters.

Squashed:

diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
index 374e4b835ff0..bc2494e5710a 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -273,8 +273,7 @@ struct kvmppc_ops {
 	void (*inject_interrupt)(struct kvm_vcpu *vcpu, int vec, u64 srr1_flags);
 	void (*set_msr)(struct kvm_vcpu *vcpu, u64 msr);
 	int (*vcpu_run)(struct kvm_run *run, struct kvm_vcpu *vcpu);
-	int (*vcpu_create)(struct kvm *kvm, struct kvm_vcpu *vcpu,
-			   unsigned int id);
+	int (*vcpu_create)(struct kvm_vcpu *vcpu);
 	void (*vcpu_free)(struct kvm_vcpu *vcpu);
 	int (*check_requests)(struct kvm_vcpu *vcpu);
 	int (*get_dirty_log)(struct kvm *kvm, struct kvm_dirty_log *log);
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 5ad20fc0c6a1..3f7adcb0ff63 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -791,7 +791,7 @@ void kvmppc_decrementer_func(struct kvm_vcpu *vcpu)
 
 int kvmppc_core_vcpu_create(struct kvm_vcpu *vcpu)
 {
-	return kvm->arch.kvm_ops->vcpu_create(vcpu);
+	return vcpu->kvm->arch.kvm_ops->vcpu_create(vcpu);
 }
 
 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index dd7440e50c7a..d41765157f0e 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -2116,7 +2116,7 @@ int kvmppc_core_init_vm(struct kvm *kvm)
 
 int kvmppc_core_vcpu_create(struct kvm_vcpu *vcpu)
 {
-	return kvm->arch.kvm_ops->vcpu_create(vcpu);
+	return vcpu->kvm->arch.kvm_ops->vcpu_create(vcpu);
 }
 
 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)