linux-kernel - Re: [PATCH 42/45] KVM: arm64: Free sve

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Date:   Tue, 22 Oct 2019 11:41:39 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Christoffer Dall <christoffer.dall@....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>,
        Radim Krčmář <rkrcmar@...hat.com>,
        kvm-ppc@...r.kernel.org, Wanpeng Li <wanpengli@...cent.com>,
        kvm@...r.kernel.org, David Hildenbrand <david@...hat.com>,
        Joerg Roedel <joro@...tes.org>,
        Cornelia Huck <cohuck@...hat.com>, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        kvmarm@...ts.cs.columbia.edu, Jim Mattson <jmattson@...gle.com>
Subject: Re: [PATCH 42/45] KVM: arm64: Free sve_state via arm specific hook

On Tue, Oct 22, 2019 at 01:43:42PM +0200, Christoffer Dall wrote:
> On Mon, Oct 21, 2019 at 06:59:22PM -0700, Sean Christopherson wrote:
> > Add an arm specific hook to free the arm64-only sve_state.  Doing so
> > eliminates the last functional code from kvm_arch_vcpu_uninit() across
> > all architectures and paves the way for removing kvm_arch_vcpu_init()
> > and kvm_arch_vcpu_uninit() entirely.
> > 
> > Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> > ---
> >  arch/arm/include/asm/kvm_host.h   | 1 +
> >  arch/arm64/include/asm/kvm_host.h | 1 +
> >  arch/arm64/kvm/reset.c            | 5 +++++
> >  virt/kvm/arm/arm.c                | 2 ++
> >  4 files changed, 9 insertions(+)
> > 
> > diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
> > index 8a37c8e89777..cc414de5acd3 100644
> > --- a/arch/arm/include/asm/kvm_host.h
> > +++ b/arch/arm/include/asm/kvm_host.h
> > @@ -333,6 +333,7 @@ static inline void kvm_arch_sync_events(struct kvm *kvm) {}
> >  static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
> >  static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
> >  static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
> > +static inline int kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu) {}
> >  
> >  static inline void kvm_arm_init_debug(void) {}
> >  static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {}
> > diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> > index f656169db8c3..92d7c384a4ed 100644
> > --- a/arch/arm64/include/asm/kvm_host.h
> > +++ b/arch/arm64/include/asm/kvm_host.h
> > @@ -52,6 +52,7 @@ int kvm_arm_init_sve(void);
> >  
> >  int __attribute_const__ kvm_target_cpu(void);
> >  int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
> > +int kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu);
> >  void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
> >  int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext);
> >  void __extended_idmap_trampoline(phys_addr_t boot_pgd, phys_addr_t idmap_start);
> > diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
> > index f4a8ae918827..98abc4278f42 100644
> > --- a/arch/arm64/kvm/reset.c
> > +++ b/arch/arm64/kvm/reset.c
> > @@ -205,6 +205,11 @@ bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu)
> >  }
> >  
> >  void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
> > +{
> > +
> > +}
> > +
> > +int kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu)
> >  {
> >  	kfree(vcpu->arch.sve_state);
> >  }
> 
> nit: warning: control reaches end of non-void function

Doh, fixed.  Thanks for the quick review!