From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.15]) (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 52509352F8D for ; Tue, 18 Nov 2025 11:29:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.15 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763465369; cv=none; b=DLJZkCSonTr5pmxI014trxiNBbSMlT99321dZ9u5hLvemdJjf6ilVWANIY7yYULxGZTBoOo6wHTgFpJT6GWl35XT+bJqwGVGzvsGzlc3yNhhrvRozdLRD0W6Dthn34j78fIC/bPHYj8Mo1u5xdFuBwVmAjNQQHma/FAm8yPEfn4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763465369; c=relaxed/simple; bh=xtuwQKGAk/ErGNA8uIe3gd8aTR9BG9uT/nLd0C3TKSg=; h=Message-ID:Date:MIME-Version:Cc:Subject:To:References:From: In-Reply-To:Content-Type; b=MCod0Rw0XCZuNC1AjsZZm7J3fMd+hGSfcROh7qA5soDZuYrfWp0khAQBTkqcUrAqEou+tju/YPlcE8jF9wvybsk38v9f+BmzZW06VDiFL7MZMrHRWmXwbdUgp+lGPDHdHSvLUpHpGtVsNKP4R6gB/Xpp33qbdpOfM/EE3c2Vufc= 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=IzIkJYGc; arc=none smtp.client-ip=192.198.163.15 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="IzIkJYGc" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1763465367; x=1795001367; h=message-id:date:mime-version:cc:subject:to:references: from:in-reply-to:content-transfer-encoding; bh=xtuwQKGAk/ErGNA8uIe3gd8aTR9BG9uT/nLd0C3TKSg=; b=IzIkJYGclEM1fqh4c97iNiQS1XvvEs50c/LJ8oWhKD2ZUF+mZ72hBV54 2NTkuonqgxfiGFCMWbV+gjK9+0sZ6MktdJYTYHwEOgt0EMuPTxgkBUm/1 wCyQgNk93ZvMF399B9vwHjDXCF1Ou7Kxcj/0g9jcl5VO/pQKwY3PXCLvh rEo2jIBPAc0dJFXygoz5oaxracnXvcpybdLBBP/Yp7trdD8H0ULTsqKIe 6yaVh025HHpqpfiFk0HlgTO7W/2K62nVpnVUAR8rxtt8XFCJGTC8zOfi4 HmGrCZnSOzDFMTTPWrWwjLN574kK8/jZve2E97y7x4PQAgCY5tpCc2ITl Q==; X-CSE-ConnectionGUID: xLyUZlVCSUW22idQs+lsNg== X-CSE-MsgGUID: VA3O8KbRSaqgBSxSJ0Honw== X-IronPort-AV: E=McAfee;i="6800,10657,11616"; a="65574713" X-IronPort-AV: E=Sophos;i="6.19,314,1754982000"; d="scan'208";a="65574713" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by fmvoesa109.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Nov 2025 03:29:26 -0800 X-CSE-ConnectionGUID: mKoK09e0QHSWwSAPWPKSog== X-CSE-MsgGUID: VzUCmTUTR/CF2B6XCP69hA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,314,1754982000"; d="scan'208";a="221637088" Received: from blu2-mobl.ccr.corp.intel.com (HELO [10.124.246.21]) ([10.124.246.21]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Nov 2025 03:29:24 -0800 Message-ID: <1843821d-c3ca-480d-909c-2331521f6932@linux.intel.com> Date: Tue, 18 Nov 2025 19:29:22 +0800 Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Cc: baolu.lu@linux.intel.com, "intel-gfx@lists.freedesktop.org" , "intel-xe@lists.freedesktop.org" , "De Marchi, Lucas" , "Kurmi, Suresh Kumar" , "Saarinen, Jani" , "Auld, Matthew" , "iommu@lists.linux.dev" Subject: Re: REGRESSION on linux-next (next-20251106) To: "Tian, Kevin" , Jason Gunthorpe , "Borah, Chaitanya Kumar" References: <4f15cf3b-6fad-4cd8-87e5-6d86c0082673@intel.com> <20251118012944.GA60885@nvidia.com> <5ec170fa-d5e1-473d-a7b8-8d1737efb241@linux.intel.com> Content-Language: en-US From: Baolu Lu In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 11/18/2025 3:47 PM, Tian, Kevin wrote: >> From: Baolu Lu >> Sent: Tuesday, November 18, 2025 2:24 PM >> >> On 11/18/25 12:04, Tian, Kevin wrote: >>>> 46 bits is not particularly big... Hmm, I wonder if we have some issue >>>> with the sign-extend? iommupt does that properly and IIRC the old code >>>> did not. Which of the page table formats is this using second stage or >>>> first stage? >>> Assume it's first stage for kernel IOVA, if available in hw >> >> It's the first stage (x86_64 fmt) according to the PASID entry setup: >> >> IOMMU dmar0: Root Table Address: 0x105a82000 >> B.D.F Root_entry Context_entry >> PASID PASID_table_entry >> 00:02.0 0x0000000000000000:0x0000000105a85001 >> 0x0000000000000000:0x0000000105a84405 0 >> 0x0000000105a86000:0x0000000000000002:0x0000000000000049 >> > > so the 3rd experiment (if the former two doesn't show difference) is > to force using second stage to see whether it's caused by the > sign-extend logic. I hardcoded the driver to always use the second stage for paging domain translation, and it works now. IOMMU dmar0: Root Table Address: 0x1049b6000 B.D.F Root_entry Context_entry PASID PASID_table_entry 00:02.0 0x0000000000000000:0x00000001049ba001 0x0000000000000000:0x00000001049b9405 0 0x0000000000000000:0x0000000000000002:0x00000001049bb089 Thanks, baolu