linux-kernel - Re: [PATCH v4 7/8] mm: Hook up Kconfig options for async page table freeing

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250905184409.GS616306@nvidia.com>
Date: Fri, 5 Sep 2025 15:44:09 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Lu Baolu <baolu.lu@...ux.intel.com>
Cc: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
	Robin Murphy <robin.murphy@....com>,
	Kevin Tian <kevin.tian@...el.com>, Jann Horn <jannh@...gle.com>,
	Vasant Hegde <vasant.hegde@....com>,
	Dave Hansen <dave.hansen@...el.com>,
	Alistair Popple <apopple@...dia.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Uladzislau Rezki <urezki@...il.com>,
	Jean-Philippe Brucker <jean-philippe@...aro.org>,
	Andy Lutomirski <luto@...nel.org>, Yi Lai <yi1.lai@...el.com>,
	iommu@...ts.linux.dev, security@...nel.org,
	linux-kernel@...r.kernel.org,
	Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH v4 7/8] mm: Hook up Kconfig options for async page table
 freeing

On Fri, Sep 05, 2025 at 01:51:02PM +0800, Lu Baolu wrote:
> From: Dave Hansen <dave.hansen@...ux.intel.com>
> 
> The CONFIG_ASYNC_PGTABLE_FREE option controls whether an architecture
> requires asynchronous page table freeing. On x86, this is selected if
> IOMMU_SVA is enabled, because both Intel and AMD IOMMU architectures
> could potentially cache kernel page table entries in their paging
> structure cache, regardless of the permission.
> 
> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> ---
>  arch/x86/Kconfig | 1 +
>  mm/Kconfig       | 3 +++
>  2 files changed, 4 insertions(+)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason