linux-kernel - Re: [REWORKED PATCH 1/1] iommu/vt-d: Preset Access/Dirty bits for IOVA over FL

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Message-ID: <726aede1-3d9f-6666-b31d-9db8e4301a0c@linux.intel.com>
Date:   Mon, 17 May 2021 15:17:53 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     baolu.lu@...ux.intel.com, sashal@...nel.org, ashok.raj@...el.com,
        jroedel@...e.de, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [REWORKED PATCH 1/1] iommu/vt-d: Preset Access/Dirty bits for
 IOVA over FL

Hi Greg,

On 5/17/21 3:07 PM, Greg KH wrote:
> On Mon, May 17, 2021 at 11:49:13AM +0800, Lu Baolu wrote:
>> [ Upstream commit a8ce9ebbecdfda3322bbcece6b3b25888217f8e3 ]
>>
>> The Access/Dirty bits in the first level page table entry will be set
>> whenever a page table entry was used for address translation or write
>> permission was successfully translated. This is always true when using
>> the first-level page table for kernel IOVA. Instead of wasting hardware
>> cycles to update the certain bits, it's better to set them up at the
>> beginning.
>>
>> Suggested-by: Ashok Raj <ashok.raj@...el.com>
>> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
>> Link: https://lore.kernel.org/r/20210115004202.953965-1-baolu.lu@linux.intel.com
>> Signed-off-by: Joerg Roedel <jroedel@...e.de>
>> Signed-off-by: Sasha Levin <sashal@...nel.org>
>> ---
>>   drivers/iommu/intel/iommu.c | 14 ++++++++++++--
>>   include/linux/intel-iommu.h |  2 ++
>>   2 files changed, 14 insertions(+), 2 deletions(-)
>>
>> [Note:
>> - This is a reworked patch of
>>    https://lore.kernel.org/stable/20210512144819.664462530@linuxfoundation.org/T/#m65267f0a0091c2fcbde097cea91089775908faad.
>> - It aims to fix a reported issue of
>>    https://bugzilla.kernel.org/show_bug.cgi?id=213077.
>> - Please help to review and test.]
> 
> What stable tree(s) is this supposed to be for?

It's for 5.10.37.

> 
> thanks,
> 
> greg k-h
> 

Best regards,
baolu