linux-kernel - Re: [PATCH v3 3/8] iommu/vt-d: Reject SVM bind for failed capability check

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Date:   Wed, 20 Nov 2019 21:59:49 +0100
From:   Auger Eric <eric.auger@...hat.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        David Woodhouse <dwmw2@...radead.org>
Cc:     "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>, Yi Liu <yi.l.liu@...el.com>,
        "Mehta, Sohil" <sohil.mehta@...el.com>
Subject: Re: [PATCH v3 3/8] iommu/vt-d: Reject SVM bind for failed capability
 check

Hi Jacob,

On 11/19/19 6:56 PM, Jacob Pan wrote:
> Add a check during SVM bind to ensure CPU and IOMMU hardware capabilities
> are met.
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Acked-by: Lu Baolu <baolu.lu@...ux.intel.com>
I sent my Rb on v2:
Reviewed-by: Eric Auger <eric.auger@...hat.com>

Thanks

Eric
> ---
>  drivers/iommu/intel-svm.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
> index 716c543488f6..74df10a39dfc 100644
> --- a/drivers/iommu/intel-svm.c
> +++ b/drivers/iommu/intel-svm.c
> @@ -238,6 +238,9 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
>  	if (!iommu || dmar_disabled)
>  		return -EINVAL;
>  
> +	if (!intel_svm_capable(iommu))
> +		return -ENOTSUPP;
> +
>  	if (dev_is_pci(dev)) {
>  		pasid_max = pci_max_pasids(to_pci_dev(dev));
>  		if (pasid_max < 0)
>