linux-kernel - Re: [PATCH v2] iommu/vt-d: Flush cache for PASID table before using it

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Message-ID: <69866166-32ce-48a7-9429-c6b77afa6eb0@linux.intel.com>
Date: Tue, 20 Jan 2026 15:01:43 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Dmytro Maluka <dmaluka@...omium.org>,
 David Woodhouse <dwmw2@...radead.org>, iommu@...ts.linux.dev
Cc: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
 Robin Murphy <robin.murphy@....com>, linux-kernel@...r.kernel.org,
 "Vineeth Pillai (Google)" <vineeth@...byteword.org>,
 Aashish Sharma <aashish@...hishsharma.net>,
 Grzegorz Jaszczyk <jaszczyk@...omium.org>,
 Chuanxiao Dong <chuanxiao.dong@...el.com>, Kevin Tian <kevin.tian@...el.com>
Subject: Re: [PATCH v2] iommu/vt-d: Flush cache for PASID table before using
 it

On 12/21/25 20:35, Dmytro Maluka wrote:
> When writing the address of a freshly allocated zero-initialized PASID
> table to a PASID directory entry, do that after the CPU cache flush for
> this PASID table, not before it, to avoid the time window when this
> PASID table may be already used by non-coherent IOMMU hardware while
> its contents in RAM is still some random old data, not zero-initialized.
> 
> v1 -> v2:
> Add Fixes: tag.
> 
> Fixes: 194b3348bdbb ("iommu/vt-d: Fix PASID directory pointer coherency")
> Signed-off-by: Dmytro Maluka<dmaluka@...omium.org>
> ---
>   drivers/iommu/intel/pasid.c | 7 ++++---
>   1 file changed, 4 insertions(+), 3 deletions(-)

Queued for iommu next.

Thanks,
baolu