linux-kernel - Re: [PATCH v10 1/3] iommu: Enhance IOMMU default DMA mode build options

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Message-ID: <18764b43-6c60-eb6d-783f-b7d4fe146b8e@huawei.com>
Date:   Thu, 3 Jun 2021 18:04:46 +0100
From:   John Garry <john.garry@...wei.com>
To:     Randy Dunlap <rdunlap@...radead.org>, <joro@...tes.org>,
        <will@...nel.org>, <dwmw2@...radead.org>,
        <baolu.lu@...ux.intel.com>, <robin.murphy@....com>
CC:     <linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
        <linuxarm@...wei.com>, <thunder.leizhen@...wei.com>,
        <chenxiang66@...ilicon.com>
Subject: Re: [PATCH v10 1/3] iommu: Enhance IOMMU default DMA mode build
 options

On 03/06/2021 18:00, Randy Dunlap wrote:
>> +config IOMMU_DEFAULT_STRICT
>> +	bool "strict"
>> +	help
>> +	  For every IOMMU DMA unmap operation, the flush operation of IOTLB and
>> +	  the free operation of IOVA are guaranteed to be done in the unmap
>> +	  function.
>> +
>> +	  This mode is safer than the two above, but it maybe slower in some
> There don't seem to be two above?
> 

Right, it's a remnant from a previous version - will fix, pending other 
reviews

>> +	  high performace scenarios.
> 	       performance
> 

ok

>> +
>> +endchoice

Thanks!