linux-kernel - Re: [PATCH v8 18/18] iommu/arm-smmu: Do not advertise IOMMU_CAP_INTR

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Date:   Wed, 18 Jan 2017 12:46:02 +0100
From:   Tomasz Nowicki <tn@...ihalf.com>
To:     Eric Auger <eric.auger@...hat.com>, eric.auger.pro@...il.com,
        christoffer.dall@...aro.org, marc.zyngier@....com,
        robin.murphy@....com, alex.williamson@...hat.com,
        will.deacon@....com, joro@...tes.org, tglx@...utronix.de,
        jason@...edaemon.net, linux-arm-kernel@...ts.infradead.org
Cc:     drjones@...hat.com, kvm@...r.kernel.org, punit.agrawal@....com,
        linux-kernel@...r.kernel.org, geethasowjanya.akula@...il.com,
        diana.craciun@....com, iommu@...ts.linux-foundation.org,
        pranav.sawargaonkar@...il.com, bharat.bhushan@....com,
        shankerd@...eaurora.org, gpkulkarni@...il.com
Subject: Re: [PATCH v8 18/18] iommu/arm-smmu: Do not advertise
 IOMMU_CAP_INTR_REMAP anymore

On 11.01.2017 10:41, Eric Auger wrote:
> IOMMU_CAP_INTR_REMAP has been advertised in arm-smmu(-v3) although
> on ARM this property is not attached to the IOMMU but rather is
> implemented in the MSI controller (GICv3 ITS).
>
> Now vfio_iommu_type1 checks MSI remapping capability at MSI controller
> level, let's correct this.
>
> Signed-off-by: Eric Auger <eric.auger@...hat.com>
> Acked-by: Will Deacon <will.deacon@....com>

For patches [15-18]:
Reviewed-by: Tomasz Nowicki <tomasz.nowicki@...iumnetworks.com>

Thanks,
Tomasz

>
> ---
>
> v7 -> v8:
> - added Will's A-b
> ---
>  drivers/iommu/arm-smmu-v3.c | 2 --
>  drivers/iommu/arm-smmu.c    | 2 --
>  2 files changed, 4 deletions(-)
>
> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
> index 6c4111c..d9cf6cb 100644
> --- a/drivers/iommu/arm-smmu-v3.c
> +++ b/drivers/iommu/arm-smmu-v3.c
> @@ -1375,8 +1375,6 @@ static bool arm_smmu_capable(enum iommu_cap cap)
>  	switch (cap) {
>  	case IOMMU_CAP_CACHE_COHERENCY:
>  		return true;
> -	case IOMMU_CAP_INTR_REMAP:
> -		return true; /* MSIs are just memory writes */
>  	case IOMMU_CAP_NOEXEC:
>  		return true;
>  	default:
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> index a354572..13d2600 100644
> --- a/drivers/iommu/arm-smmu.c
> +++ b/drivers/iommu/arm-smmu.c
> @@ -1374,8 +1374,6 @@ static bool arm_smmu_capable(enum iommu_cap cap)
>  		 * requests.
>  		 */
>  		return true;
> -	case IOMMU_CAP_INTR_REMAP:
> -		return true; /* MSIs are just memory writes */
>  	case IOMMU_CAP_NOEXEC:
>  		return true;
>  	default:
>