linux-kernel - Re: [PATCH v3 7/8] iommu/vt-d: Avoid sending invalid page response

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Date:   Wed, 20 Nov 2019 22:07:27 +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 7/8] iommu/vt-d: Avoid sending invalid page response

Hi Jacob,

On 11/19/19 6:56 PM, Jacob Pan wrote:
> Page responses should only be sent when last page in group (LPIG) or
> private data is present in the page request. This patch avoids sending
> invalid descriptors.
> 
> Fixes: 5d308fc1ecf53 ("iommu/vt-d: Add 256-bit invalidation descriptor
> support")
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Acked-by: Lu Baolu <baolu.lu@...ux.intel.com>
R-b sent on v2
Reviewed-by: Eric Auger <eric.auger@...hat.com>

Eric
> ---
>  drivers/iommu/intel-svm.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
> index 71b85b892c56..4eecc24412dc 100644
> --- a/drivers/iommu/intel-svm.c
> +++ b/drivers/iommu/intel-svm.c
> @@ -686,11 +686,10 @@ static irqreturn_t prq_event_thread(int irq, void *d)
>  			if (req->priv_data_present)
>  				memcpy(&resp.qw2, req->priv_data,
>  				       sizeof(req->priv_data));
> +			resp.qw2 = 0;
> +			resp.qw3 = 0;
> +			qi_submit_sync(&resp, iommu);
>  		}
> -		resp.qw2 = 0;
> -		resp.qw3 = 0;
> -		qi_submit_sync(&resp, iommu);
> -
>  		head = (head + sizeof(*req)) & PRQ_RING_MASK;
>  	}
>  
>