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

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Date:   Tue, 22 Oct 2019 13:43:42 +0200
From:   Christoffer Dall <christoffer.dall@....com>
To:     Sean Christopherson <sean.j.christopherson@...el.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 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

> diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
> index aac4e5a1a521..b38088415cde 100644
> --- a/virt/kvm/arm/arm.c
> +++ b/virt/kvm/arm/arm.c
> @@ -298,6 +298,8 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
>  	kvm_mmu_free_memory_caches(vcpu);
>  	kvm_timer_vcpu_terminate(vcpu);
>  	kvm_pmu_vcpu_destroy(vcpu);
> +
> +	kvm_arm_vcpu_destroy(vcpu);
>  }
>  
>  int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
> -- 
> 2.22.0
> 
> _______________________________________________

Thanks,

    Christoffer