From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-qv1-f53.google.com (mail-qv1-f53.google.com [209.85.219.53]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 45BF1345752 for ; Thu, 12 Mar 2026 13:45:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.53 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773323157; cv=none; b=EbGbuTVXouhYePI2tnMLxOJtr5cNK0B2Mk9Ljs0mzoOZfiVRtMg9yLpU2TE+GSbFW7Zvwyf1QSeFn64o/KJV5Pv1QEvb91g+JKi9xA78Nrndmka/T6B3E/6BaLkXKGubw/z3lORut5IMjTLbX47JpzO8ARr7FytCPKItpN7fq/M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773323157; c=relaxed/simple; bh=Uk1eaYDxwOnXFe0hwehMJCK9C/PQO7sHzmbsbGmxH5M=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=ni4xOrzjUmsKO+J1buXBRizLtnwIKGDA4d5XXI65n2q+8Nn1ttxTL76KedOyxrZlB6lNwqgff7P+7N+yEcHCMYwkOVCzC4b7IYIN+8stin2tMJujiAOclWtglRxQd1W7JXABPhNenmzfxdq2FVeljGt+WfYmIjTlWFulNC9PH7c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca; spf=pass smtp.mailfrom=ziepe.ca; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b=A4c2O6jr; arc=none smtp.client-ip=209.85.219.53 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ziepe.ca Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="A4c2O6jr" Received: by mail-qv1-f53.google.com with SMTP id 6a1803df08f44-89a1d7cc7f0so9139486d6.1 for ; Thu, 12 Mar 2026 06:45:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; t=1773323153; x=1773927953; darn=vger.kernel.org; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:from:to :cc:subject:date:message-id:reply-to; bh=KZDiw0IT1ijhJVTsklLTZr5XMWeDhUL7eVQ3gusiaQ0=; b=A4c2O6jrn1Jukq2kUi6FyWHcuxdw71uKSrJk1PxE9h6p6R97FfLKvVNNq1dSN7IIO7 zRiwkK4bxiI9Pfh5+tSpA4Xn3dDEjnJ5fsb/nEeX/cZVmnD+ahrkeKQfKafGc9NyGwdM eTjHMapxfXlAyIQt2mBkxGS0pO3RoCjJG1K/KPiBHEuK6EouJDCNopX97TQ10ih9GNTP tW+W3ZNNsHbYS/9WFsX30mXEiSSOJhZWI7dqO01TJ7DxR6Ov5pVzGg81PNNCJZOnZSd+ fTxOj7yAgg25sMT+9TBQ1N38jEm913AunfPmzXrovd1KKmNEuwnADDeuD2LIO36E7Dd7 EZvQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1773323153; x=1773927953; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=KZDiw0IT1ijhJVTsklLTZr5XMWeDhUL7eVQ3gusiaQ0=; b=FSnqO+np5Zn+y49ADD861iO/64+4U4TkPcTdmqvlXW3hsKYbV9KBFxKb81rJliyItg /55DfDE8443YhpD6s1Sc5k+uXsgh6UOtkFEzBnUX1GN8Do6UwhNHWTkKMsHW4bmnEAti /PcHThoDQAVCWAfx48cUS0CKveP3LK4hl72vcI4cUFr4LMPOt5DiNWbzTMllFwG9y5ik YVHvnh9AVF+avFAirifOp6/SOntxNpr3brPzO3FDYr6jmB+XmrpnL6vqPidUq4D74Wzv M5kkSGKGmBI8CNvHIacBZil4rdDIrHmewwNZWRvCiC3URNH1tcNA7SqtscsW5dHfG00L FyGg== X-Forwarded-Encrypted: i=1; AJvYcCUy9f0Au9rePPhRekc//SgnlbY0BRnFDPIPAB10rb7O2Qmh0Q9N6CC/4R55c/PMQbZ79xugkA1azIhmzp4=@vger.kernel.org X-Gm-Message-State: AOJu0YxWiqriMdb5aMJ+Do5HNk2Yov5dUsS3fKLHd9ZfS0N5WkypdPRt DjSWQlDZAV4Z4v0/RMzmoi44QGwACSF6gBx7mShyqiDxtwHZDhDXFVsZJr643U0Lfh8= X-Gm-Gg: ATEYQzz957drd5K3nJUPAqq0lEd1bxvGU0ep0Cx8cC5mQScyWFXdjFV8WVJYk7eqWgf ZYg8rz/jAKT3k2+YcVQ6NX+8lykGm7oXON2nhJuTH+1uFnNWEggfx8Shi+m2z5nfnmf6GQYGlGq AP92i2y1XGlU9TUmqlkxd52hYfSzA4qhpoTWZk20DBabxHmQVA177Zt8LW5YXJE8TciRw5kFcuF 9fc0RZebk4hvRgD/FBC8Rh5U9oBTUR4bgbtBMq61KbYBkmJFSjhEERP2LYBexS+SCxMTMUzhfVe 0qWSos7pYj/KwxkNzbstnnaFMYwHHkVhhbhZbT7cbPNvYFk+YXxdAAHj7zisYdTCrZDv4+pFCjy dIbuiiMViDJCHy8Gip8SYk+t4s3IZkrUBAhGl7B1mW/8fqrvYUc0Vkw43WkFFmX1sTQxB+dX3w6 DxztgEi9iga5TQ9/qYGqsJeha3KGQ1yhW3QJaQ7EcgGba2RZ5+odkh4Vjc8eqWaIAnjbzcREmNf /3GarOO X-Received: by 2002:a05:6214:400d:b0:89a:ff2:b8da with SMTP id 6a1803df08f44-89a66a85c85mr88443906d6.47.1773323153208; Thu, 12 Mar 2026 06:45:53 -0700 (PDT) Received: from ziepe.ca (hlfxns017vw-142-162-112-119.dhcp-dynamic.fibreop.ns.bellaliant.net. [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: linux-kernel@vger.kernel.org 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