linux-kernel - Re: [PATCH 06/10] iommu/vt-d: Fix off-by-one in PASID allocation

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Date:   Mon, 18 Nov 2019 09:34:17 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.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>,
        David Woodhouse <dwmw2@...radead.org>
Cc:     baolu.lu@...ux.intel.com, "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>, Yi Liu <yi.l.liu@...el.com>,
        Eric Auger <eric.auger@...hat.com>
Subject: Re: [PATCH 06/10] iommu/vt-d: Fix off-by-one in PASID allocation

Hi,

On 11/16/19 7:09 AM, Jacob Pan wrote:
> PASID allocator uses IDR which is exclusive for the end of the
> allocation range. There is no need to decrement pasid_max.
> 
> Fixes: af39507305fb ("iommu/vt-d: Apply global PASID in SVA")
> Reported-by: Eric Auger <eric.auger@...hat.com>
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>

Acked-by: Lu Baolu <baolu.lu@...ux.intel.com>

Best regards,
baolu

> ---
>   drivers/iommu/intel-svm.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
> index 924a4de84be1..b5537f27592f 100644
> --- a/drivers/iommu/intel-svm.c
> +++ b/drivers/iommu/intel-svm.c
> @@ -338,7 +338,7 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
>   		/* Do not use PASID 0 in caching mode (virtualised IOMMU) */
>   		ret = intel_pasid_alloc_id(svm,
>   					   !!cap_caching_mode(iommu->cap),
> -					   pasid_max - 1, GFP_KERNEL);
> +					   pasid_max, GFP_KERNEL);
>   		if (ret < 0) {
>   			kfree(svm);
>   			kfree(sdev);
>