From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6FAA7220687 for ; Fri, 3 Jul 2026 01:28:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.12 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783042086; cv=none; b=t5Mi/iN8l89DnwULS2xnWwSJRyW12xSVkRtXdA8V6Au4V1kTW4WGU0k3bpY5BHAO03IbI6bVZa8onPbquc6gYSoxiKDfB0ATWhcGEiRPDKfvr22z2h4HRBGB5Mhlf2pA64HJsM1YTA4M6Gx9rxeiiz0WIDqq4Inh+2FqkwpOe8E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783042086; c=relaxed/simple; bh=RtgZm7OYnpGKhWmXgmo5LBLpOdkf67Q1hCQx9VOe0B8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=eMJXX/JjK2M4G1yw4IT/8/Z7/uxuXKn2//EtBSz8PIZv6Vkpn18NmJC432xgfS+dF5tPFLchDhdn1lH67wQXI6OTkULZME6DCOYC32CsVvrxwVP6r/ov6SlbHplm5ajrS6FhC/AfsckVFzdwy994zzQBdQ9ZT7O69pQ82qjWyBU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=PNm/mGGa; arc=none smtp.client-ip=198.175.65.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="PNm/mGGa" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1783042084; x=1814578084; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=RtgZm7OYnpGKhWmXgmo5LBLpOdkf67Q1hCQx9VOe0B8=; b=PNm/mGGaDjqA0KUIG6N8nbzFW4FDsoK7Jue3rYXzWClq4e336/4LZeKe PVNq9kWYJ94NauCwg3PI4DdAWBEZ6pfO3Kr/47OKITpnwwpx6i0gmhcmp fwXccr0chfh1ztWQ1fhrbhQ/T+GusZMn3SV4XkBa93rXgNysy2DSp+6yj yl34cbI4KSbtVUIwq1rZHQeVa81z2DINkZNpTEnfNpLD58wAEGKWgErNS ZfdOHEHafuhjVK2pIXJGQBce/B0DP9CEaDyscQolYubbVRi2fMp1/Yq2i WA9IVUMcHz77dWAPACdK6ZIGzqAvqDdJf/WCO5GyqWdcrnY5DNpLWszKp A==; X-CSE-ConnectionGUID: IRP0RhZIT5aE4ktG3NtTUA== X-CSE-MsgGUID: z0gBc7zKTxSUIj6sqM96ig== X-IronPort-AV: E=McAfee;i="6800,10657,11835"; a="95299754" X-IronPort-AV: E=Sophos;i="6.25,144,1779174000"; d="scan'208";a="95299754" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by orvoesa104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Jul 2026 18:28:04 -0700 X-CSE-ConnectionGUID: Q0X92sAzT2SLdXslaphUDg== X-CSE-MsgGUID: h1z9Am2zR6S61A3OAEOW2w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,144,1779174000"; d="scan'208";a="250335582" Received: from allen-sbox.sh.intel.com (HELO [10.239.159.30]) ([10.239.159.30]) by fmviesa008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Jul 2026 18:28:02 -0700 Message-ID: Date: Fri, 3 Jul 2026 09:26:37 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] iommu/vt-d: respect user override for intel_iommu=on on Lenovo ThinkPad P50s To: Oliver Lin Cc: iommu@lists.linux.dev, linux-kernel@vger.kernel.org, joro@8bytes.org, robin.murphy@arm.com, will@kernel.org References: <8d131b2c-978e-4aac-88aa-21b39237344a@liuxiaozhen.dev> <20260702103137.508709-1-oliver@liuxiaozhen.dev> Content-Language: en-US From: Baolu Lu In-Reply-To: <20260702103137.508709-1-oliver@liuxiaozhen.dev> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 7/2/26 18:31, Oliver Lin wrote: > From: oliver > > The current DMI quirk disables VT-d on ThinkPad P50s unconditionally, > even when intel_iommu=on is explicitly requested via kernel command line. The current driver doesn't have the DMI quirk, so this patch cannot be applied to the tree as-is. > This breaks kernel parameter precedence and user intent. > > Make the quirk conditional so that it does not override explicit user > enabling of Intel IOMMU. > > Signed-off-by: Oliver > --- > drivers/iommu/intel/iommu.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) Thanks, baolu