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[142.162.112.119]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-89a65bd5603sm34499696d6.2.2026.03.12.06.45.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Mar 2026 06:45:52 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1w0gMK-00000006fmW-0475; Thu, 12 Mar 2026 10:45:52 -0300 Date: Thu, 12 Mar 2026 10:45:51 -0300 From: Jason Gunthorpe To: Ankit Soni Cc: iommu@lists.linux.dev, vasant.hegde@amd.com, suravee.suthikulpanit@amd.com, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 2/2] iommu/amd: Adhere to IVINFO[VASIZE] for address limits Message-ID: <20260312134551.GL1469476@ziepe.ca> References: Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Mon, Mar 09, 2026 at 02:05:28PM +0000, Ankit Soni wrote: > ACPI IVRS IVHD’s IVINFO field reports the maximum virtual address > size (VASIZE) supported by the IOMMU. The AMD IOMMU driver currently > caps this with pagetable level reported by EFR[HATS] when configuring > paging domains (hw_max_vasz_lg2). On systems where firmware or VM > advertises smaller or different limits, the driver may over-advertise > capabilities and create domains outside the hardware’s actual bounds. > > Signed-off-by: Ankit Soni > --- > drivers/iommu/amd/amd_iommu.h | 2 +- > drivers/iommu/amd/amd_iommu_types.h | 1 + > drivers/iommu/amd/init.c | 13 +++++++++---- > drivers/iommu/amd/iommu.c | 3 +-- > 4 files changed, 12 insertions(+), 7 deletions(-) Reviewed-by: Jason Gunthorpe Jason