linux-kernel - Re: [PATCH 3/4] KVM: PPC: Add support for IOMMU in-kernel handling

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Message-ID: <1369256817.1374.29@scott-Lenovo-G560>
Date:	Wed, 22 May 2013 16:06:57 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Alexey Kardashevskiy <aik@...abs.ru>
CC:	<linuxppc-dev@...ts.ozlabs.org>, <kvm@...r.kernel.org>,
	Alexey Kardashevskiy <aik@...abs.ru>,
	Alexander Graf <agraf@...e.de>, <kvm-ppc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Paul Mackerras <paulus@...ba.org>,
	David Gibson <david@...son.dropbear.id.au>
Subject: Re: [PATCH 3/4] KVM: PPC: Add support for IOMMU in-kernel handling

On 05/20/2013 10:06:46 PM, Alexey Kardashevskiy wrote:
> diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
> index 8465c2a..da6bf61 100644
> --- a/arch/powerpc/kvm/powerpc.c
> @@ -396,6 +396,7 @@ int kvm_dev_ioctl_check_extension(long ext)
> +++ b/arch/powerpc/kvm/powerpc.c
>  		break;
>  #endif
>  	case KVM_CAP_SPAPR_MULTITCE:
> +	case KVM_CAP_SPAPR_TCE_IOMMU:
>  		r = 1;
>  		break;
>  	default:

Don't advertise SPAPR capabilities if it's not book3s -- and probably  
there's some additional limitation that would be appropriate.

> @@ -1025,6 +1026,17 @@ long kvm_arch_vm_ioctl(struct file *filp,
>  		r = kvm_vm_ioctl_create_spapr_tce(kvm, &create_tce);
>  		goto out;
>  	}
> +	case KVM_CREATE_SPAPR_TCE_IOMMU: {
> +		struct kvm_create_spapr_tce_iommu create_tce_iommu;
> +		struct kvm *kvm = filp->private_data;
> +
> +		r = -EFAULT;
> +		if (copy_from_user(&create_tce_iommu, argp,
> +				sizeof(create_tce_iommu)))
> +			goto out;
> +		r = kvm_vm_ioctl_create_spapr_tce_iommu(kvm,  
> &create_tce_iommu);
> +		goto out;
> +	}
>  #endif /* CONFIG_PPC_BOOK3S_64 */
> 
>  #ifdef CONFIG_KVM_BOOK3S_64_HV
> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index 5a2afda..450c82a 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -667,6 +667,7 @@ struct kvm_ppc_smmu_info {
>  #define KVM_CAP_PPC_RTAS 91
>  #define KVM_CAP_IRQ_XICS 92
>  #define KVM_CAP_SPAPR_MULTITCE (0x110000 + 89)
> +#define KVM_CAP_SPAPR_TCE_IOMMU (0x110000 + 90)

Hmm...

> @@ -939,6 +940,9 @@ struct kvm_s390_ucas_mapping {
>  #define KVM_GET_DEVICE_ATTR	  _IOW(KVMIO,  0xe2, struct  
> kvm_device_attr)
>  #define KVM_HAS_DEVICE_ATTR	  _IOW(KVMIO,  0xe3, struct  
> kvm_device_attr)
> 
> +/* ioctl for SPAPR TCE IOMMU */
> +#define KVM_CREATE_SPAPR_TCE_IOMMU _IOW(KVMIO,  0xe4, struct  
> kvm_create_spapr_tce_iommu)

Shouldn't this go under the vm ioctl section?

-Scott
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