linux-kernel - Re: [PATCH v2] KVM: introduce kvm_arch_vcpu_async

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Date:   Wed, 13 Dec 2017 11:17:58 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     christoffer.dall@...aro.org, cohuck@...hat.com,
        James Hogan <jhogan@...nel.org>,
        Paul Mackerras <paulus@...abs.org>,
        Christian Borntraeger <borntraeger@...ibm.com>
Subject: Re: [PATCH v2] KVM: introduce kvm_arch_vcpu_async_ioctl


> +long kvm_arch_vcpu_ioctl(struct file *filp,
> +                         unsigned int ioctl, unsigned long arg)

spaces instead of tabs

> +{
> +	struct kvm_vcpu *vcpu = filp->private_data;
> +	void __user *argp = (void __user *)arg;
> +	long r;
>  
>  	vcpu_load(vcpu);
>  
> diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig
> index 9a4594e0a1ff..a3dbd459cce9 100644
> --- a/arch/s390/kvm/Kconfig
> +++ b/arch/s390/kvm/Kconfig
[...

> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 09de0ff3d677..23a680b4c932 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1260,4 +1260,15 @@ static inline bool vcpu_valid_wakeup(struct kvm_vcpu *vcpu)
>  }
>  #endif /* CONFIG_HAVE_KVM_INVALID_WAKEUPS */
>  
> +#ifdef CONFIG_HAVE_KVM_VCPU_ASYNC_IOCTL
> +long kvm_arch_vcpu_async_ioctl(struct file *filp,
> +			       unsigned int ioctl, unsigned long arg);
> +#else
> +static inline long kvm_arch_vcpu_async_ioctl(struct file *filp,
> +		      			     unsigned int ioctl, unsigned long arg)

spaces and tabs mixed

> +{
> +	return -ENOIOCTLCMD;
> +}
> +#endif /* CONFIG_HAVE_KVM_VCPU_ASYNC_IOCTL */
> +
>  #endif
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 19c184fa1839..b4414842b023 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -2544,15 +2544,13 @@ static long kvm_vcpu_ioctl(struct file *filp,
>  	if (unlikely(_IOC_TYPE(ioctl) != KVMIO))
>  		return -EINVAL;
>  
> -#if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
>  	/*
> -	 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
> -	 * so vcpu_load() would break it.
> +	 * Some architectures have vcpu ioctls that are asynchronous to vcpu
> +	 * execution; mutex_lock() would break them.
>  	 */
> -	if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_S390_IRQ || ioctl == KVM_INTERRUPT)
> -		return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
> -#endif
> -
> +	r = kvm_arch_vcpu_async_ioctl(filp, ioctl, arg);
> +	if (r != -ENOIOCTLCMD)
> +		return r;
>  
>  	if (mutex_lock_killable(&vcpu->mutex))
>  		return -EINTR;
> 

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 

Thanks,

David / dhildenb