linux-kernel - Re: [PATCH v10 07/23] iommu/io-pgtable-arm-v7s: Use ias/oas to check the valid iova/pa

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Date:   Wed, 21 Aug 2019 16:25:28 +0100
From:   Will Deacon <will@...nel.org>
To:     Yong Wu <yong.wu@...iatek.com>
Cc:     Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Robin Murphy <robin.murphy@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Evan Green <evgreen@...omium.org>,
        Tomasz Figa <tfiga@...gle.com>,
        linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, youlin.pei@...iatek.com,
        Nicolas Boichat <drinkcat@...omium.org>, anan.sun@...iatek.com,
        Matthias Kaehlcke <mka@...omium.org>, cui.zhang@...iatek.com,
        chao.hao@...iatek.com, ming-fan.chen@...iatek.com
Subject: Re: [PATCH v10 07/23] iommu/io-pgtable-arm-v7s: Use ias/oas to check
 the valid iova/pa

On Wed, Aug 21, 2019 at 09:53:10PM +0800, Yong Wu wrote:
> Use ias/oas to check the valid iova/pa. Synchronize this checking with
> io-pgtable-arm.c.
> 
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> ---
>  drivers/iommu/io-pgtable-arm-v7s.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/io-pgtable-arm-v7s.c b/drivers/iommu/io-pgtable-arm-v7s.c
> index 72f1880..fa1b38f 100644
> --- a/drivers/iommu/io-pgtable-arm-v7s.c
> +++ b/drivers/iommu/io-pgtable-arm-v7s.c
> @@ -504,7 +504,8 @@ static int arm_v7s_map(struct io_pgtable_ops *ops, unsigned long iova,
>  	if (!(prot & (IOMMU_READ | IOMMU_WRITE)))
>  		return 0;
>  
> -	if (WARN_ON(upper_32_bits(iova) || upper_32_bits(paddr)))
> +	if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias) ||
> +		    paddr >= (1ULL << data->iop.cfg.oas)))
>  		return -ERANGE;

Acked-by: Will Deacon <will@...nel.org>

Will