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

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Message-ID: <20210128103430.GI32671@8bytes.org>
Date:   Thu, 28 Jan 2021 11:34:31 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Will Deacon <will@...nel.org>, Ashok Raj <ashok.raj@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] iommu/vt-d: Preset Access/Dirty bits for IOVA over FL

On Fri, Jan 15, 2021 at 08:42:02AM +0800, Lu Baolu wrote:
> 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>
> ---
>  drivers/iommu/intel/iommu.c | 14 ++++++++++++--
>  include/linux/intel-iommu.h |  2 ++
>  2 files changed, 14 insertions(+), 2 deletions(-)

Applied, thanks.