linux-kernel - Re: [PATCH v3 1/1] iommu/sva: Invalidate KVA range on kernel TLB flush

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Message-ID: <9e0e12c7-72e2-4e92-a9c5-765c93053506@intel.com>
Date: Tue, 26 Aug 2025 07:57:39 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Matthew Wilcox <willy@...radead.org>
Cc: Baolu Lu <baolu.lu@...ux.intel.com>, "Tian, Kevin"
 <kevin.tian@...el.com>, Jason Gunthorpe <jgg@...dia.com>,
 Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
 Robin Murphy <robin.murphy@....com>, Jann Horn <jannh@...gle.com>,
 Vasant Hegde <vasant.hegde@....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>, "Lai, Yi1" <yi1.lai@...el.com>,
 "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
 "security@...nel.org" <security@...nel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "stable@...r.kernel.org" <stable@...r.kernel.org>, vishal.moola@...il.com
Subject: Re: [PATCH v3 1/1] iommu/sva: Invalidate KVA range on kernel TLB
 flush

On 8/26/25 07:33, Matthew Wilcox wrote:
...
> One memdesc type already assigned is for page tables.  Maybe iommu page
> tables are the same

One bit of context: This is an IOMMU problem but the IOMMU is walking
the normal x86 page tables in this case, specifically kernel page
tables. There are separate IOMMU page tables, of course, but those
aren't at issue here.