linux-kernel - Re: [PATCH 3/4] kvm: add stub for arch specific debugfs support

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Message-Id: <20160903123455.5121578b3135e28b82e9f705@kernel.org>
Date:   Sat, 3 Sep 2016 12:34:55 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Luiz Capitulino <lcapitulino@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        pbonzini@...hat.com, rkrcmar@...hat.com, rostedt@...dmis.org,
        mhiramat@...nel.org, mtosatti@...hat.com
Subject: Re: [PATCH 3/4] kvm: add stub for arch specific debugfs support

On Wed, 31 Aug 2016 13:05:44 -0400
Luiz Capitulino <lcapitulino@...hat.com> wrote:

> kvm_arch_create_vm_debugfs() allows arch specific code to
> create entries in the VM's directory in debugfs. x86 will
> implement support for this in the next commit.

I think we can use __weak symbol for other arch.

Thank  you,

> 
> Signed-off-by: Luiz Capitulino <lcapitulino@...hat.com>
> ---
>  arch/arm/kvm/arm.c         | 5 +++++
>  arch/mips/kvm/mips.c       | 5 +++++
>  arch/powerpc/kvm/powerpc.c | 5 +++++
>  arch/s390/kvm/kvm-s390.c   | 5 +++++
>  arch/x86/kvm/x86.c         | 5 +++++
>  include/linux/kvm_host.h   | 2 ++
>  virt/kvm/kvm_main.c        | 4 ++++
>  7 files changed, 31 insertions(+)
> 
> diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
> index 75f130e..491211f 100644
> --- a/arch/arm/kvm/arm.c
> +++ b/arch/arm/kvm/arm.c
> @@ -144,6 +144,11 @@ out_fail_alloc:
>  	return ret;
>  }
>  
> +int kvm_arch_create_vm_debugfs(struct kvm *kvm)
> +{
> +	return 0;
> +}
> +
>  int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
>  {
>  	return VM_FAULT_SIGBUS;
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index a6ea084..a854b8b 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -140,6 +140,11 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
>  	return 0;
>  }
>  
> +int kvm_arch_create_vm_debugfs(struct kvm *kvm)
> +{
> +	return 0;
> +}
> +
>  void kvm_mips_free_vcpus(struct kvm *kvm)
>  {
>  	unsigned int i;
> diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
> index 6ce40dd..d8867e5 100644
> --- a/arch/powerpc/kvm/powerpc.c
> +++ b/arch/powerpc/kvm/powerpc.c
> @@ -436,6 +436,11 @@ err_out:
>  	return -EINVAL;
>  }
>  
> +int kvm_arch_create_vm_debugfs(struct kvm *kvm)
> +{
> +	return 0;
> +}
> +
>  void kvm_arch_destroy_vm(struct kvm *kvm)
>  {
>  	unsigned int i;
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index f142215..406324c 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -1490,6 +1490,11 @@ out_err:
>  	return rc;
>  }
>  
> +int kvm_arch_create_vm_debugfs(struct kvm *kvm)
> +{
> +	return 0;
> +}
> +
>  void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
>  {
>  	VCPU_EVENT(vcpu, 3, "%s", "free cpu");
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 19f9f9e..18dfbac 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -7779,6 +7779,11 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
>  	return 0;
>  }
>  
> +int kvm_arch_create_vm_debugfs(struct kvm *kvm)
> +{
> +	return 0;
> +}
> +
>  static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
>  {
>  	int r;
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 9c28b4d..d3810bf 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -835,6 +835,8 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type);
>  void kvm_arch_destroy_vm(struct kvm *kvm);
>  void kvm_arch_sync_events(struct kvm *kvm);
>  
> +int kvm_arch_create_vm_debugfs(struct kvm *kvm);
> +
>  int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
>  void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
>  
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 9293285..2db53a8 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -601,6 +601,10 @@ static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
>  					 stat_fops_per_vm[p->kind]))
>  			goto out_err;
>  	}
> +
> +	if (kvm_arch_create_vm_debugfs(kvm) < 0)
> +		goto out_err;
> +
>  	return 0;
>  
>  out_err:
> -- 
> 2.5.5
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>