linux-kernel - Re: [PATCH 1/1] iommu/vt-d: Remove LPIG from page group response descriptor

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Message-ID: <7a1c334d-4fc5-49c5-9e67-b220ea073f81@linux.intel.com>
Date: Tue, 16 Sep 2025 12:55:48 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
 Robin Murphy <robin.murphy@....com>, Kevin Tian <kevin.tian@...el.com>,
 Jason Gunthorpe <jgg@...dia.com>
Cc: iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] iommu/vt-d: Remove LPIG from page group response
 descriptor

On 9/1/25 13:39, Lu Baolu wrote:
> Bit 66 in the page group response descriptor used to be the LPIG (Last
> Page in Group), but it was marked as Reserved since Specification 4.0.
> Remove programming on this bit to make it consistent with the latest
> specification.
> 
> Existing hardware all treats bit 66 of the page group response descriptor
> as "ignored", therefore this change doesn't break any existing hardware.
> 
> Signed-off-by: Lu Baolu<baolu.lu@...ux.intel.com>
> ---
>   drivers/iommu/intel/iommu.h | 1 -
>   drivers/iommu/intel/prq.c   | 7 ++-----
>   2 files changed, 2 insertions(+), 6 deletions(-)

Queued for v6.18.