From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3D850C54EE9 for ; Fri, 23 Sep 2022 00:42:50 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 6F47E940009; Thu, 22 Sep 2022 20:42:49 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 67CD2940007; Thu, 22 Sep 2022 20:42:49 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4F76D940009; Thu, 22 Sep 2022 20:42:49 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 3B895940007 for ; Thu, 22 Sep 2022 20:42:49 -0400 (EDT) Received: from smtpin08.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id 1B76F1A07B8 for ; Fri, 23 Sep 2022 00:42:49 +0000 (UTC) X-FDA: 79941500058.08.FF1D421 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by imf21.hostedemail.com (Postfix) with ESMTP id 32C041C000E for ; Fri, 23 Sep 2022 00:42:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1663893768; x=1695429768; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=JPr5lgzjsIUArFY+Xndl+vflTPFS3DcvwMPckr4tPVQ=; b=IqfRNjvU79MH8etydpLeB9hXXlQp2G9HSxPppOutnRB/m1Kz9AOJ1Ixz 1O+QVrO5AOeKlLtkyMPdr+INZmc6deFcCSAK+7CCcqVAUQUvnaHrIswlT A4cgqxYZJ1uVWZmumWpVl38+uxeeOXKcQreiJOelt+LhbW7lp8OseuYSq KzipsCi6F9FcD3xlr33axB7O/WiHYRRE52XW9tMBe2Hala01bLdjnz3QN nCqJ6DE/6wbd3hYZAYaKNggDWVSynNcUWhL8eCfP0l5QHeO9MF1+jboeY zdnRlUq2ma6eI+ynhoG73SWX3FN/GjemD1qm9zPHTn58kyElPutmh7mQl Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10478"; a="301913439" X-IronPort-AV: E=Sophos;i="5.93,337,1654585200"; d="scan'208";a="301913439" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Sep 2022 17:42:46 -0700 X-IronPort-AV: E=Sophos;i="5.93,337,1654585200"; d="scan'208";a="682462250" Received: from dnessim-mobl1.ger.corp.intel.com (HELO box.shutemov.name) ([10.252.60.183]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Sep 2022 17:42:42 -0700 Received: by box.shutemov.name (Postfix, from userid 1000) id 617501044E2; Fri, 23 Sep 2022 03:42:39 +0300 (+03) Date: Fri, 23 Sep 2022 03:42:39 +0300 From: "Kirill A. Shutemov" To: Jason Gunthorpe Cc: Dave Hansen , Ashok Raj , Jacob Pan , "Kirill A. Shutemov" , Ashok Raj , Dave Hansen , Andy Lutomirski , Peter Zijlstra , x86@kernel.org, Kostya Serebryany , Andrey Ryabinin , Andrey Konovalov , Alexander Potapenko , Taras Madan , Dmitry Vyukov , "H . J . Lu" , Andi Kleen , Rick Edgecombe , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Joerg Roedel Subject: Re: [PATCHv8 00/11] Linear Address Masking enabling Message-ID: <20220923004239.ma2gfrmoezsff4ro@box.shutemov.name> References: <20220914151818.uupzpyd333qnnmlt@box.shutemov.name> <20220914154532.mmxfsr7eadgnxt3s@box.shutemov.name> <20220914165116.24f82d74@jacob-builder> <20220915090135.fpeokbokkdljv7rw@box.shutemov.name> <20220915172858.pl62a5w3m5binxrk@box.shutemov.name> <562dec4d-a39f-b517-58a3-45f691a2d10a@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1663893768; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=YMM6vybL4603DsqHTGVygicqjZkeKtO1Ri/6cJnkpvk=; b=mxSpTz24uiVxloz3Jx/4uatN8H7V6gvwzY4Uwa4mhOdlSlFhbSr3EEhax6VIhdl2efiyKa nghenYQa+aAp+liCAB1If7aQcgYnmZ3k2YbhjEKSuoMO+tpCP12lQzhLt5s4yClICXdvAd zkrjWf2tzo9mUQpmiOCqpBnT8A3oyic= ARC-Authentication-Results: i=1; imf21.hostedemail.com; dkim=none ("invalid DKIM record") header.d=intel.com header.s=Intel header.b=IqfRNjvU; spf=none (imf21.hostedemail.com: domain of kirill.shutemov@linux.intel.com has no SPF policy when checking 134.134.136.65) smtp.mailfrom=kirill.shutemov@linux.intel.com; dmarc=fail reason="No valid SPF" header.from=intel.com (policy=none) ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1663893768; a=rsa-sha256; cv=none; b=z6R4EzwMRnAZvdYogjnpKM8AsSvQHv5ySA0K2E5hCzR/nBk3nLmpZvL88NW+lrflUrOMNl vcDeYO8MaCyf6m0X7RLiIRzIr0AK/T3MD4mkBkeW1TqQDMxwX2JtQa2/TAl7sZszWDVygg szXgwcQa+6+2SGqfuz0dD2Z2LXCwSNg= X-Stat-Signature: q6w1t9jbz5nhng3ggdjiiq8yinqd3fm4 X-Rspamd-Queue-Id: 32C041C000E X-Rspam-User: Authentication-Results: imf21.hostedemail.com; dkim=none ("invalid DKIM record") header.d=intel.com header.s=Intel header.b=IqfRNjvU; spf=none (imf21.hostedemail.com: domain of kirill.shutemov@linux.intel.com has no SPF policy when checking 134.134.136.65) smtp.mailfrom=kirill.shutemov@linux.intel.com; dmarc=fail reason="No valid SPF" header.from=intel.com (policy=none) X-Rspamd-Server: rspam03 X-HE-Tag: 1663893767-337404 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Sep 21, 2022 at 03:11:34PM -0300, Jason Gunthorpe wrote: > On Wed, Sep 21, 2022 at 10:11:46AM -0700, Dave Hansen wrote: > > > Are you saying that any device compatibility with an mm is solely > > determined by the IOMMU in play, so the IOMMU code should host the mm > > compatibility checks? > > Yes, exactly. Only the HW entity that walks the page tables needs to > understand their parsing rules and in this case that is only the IOMMU > block. But device has to know what bits of the virtual address are significant to handle device TLB lookup/store correctly, no? -- Kiryl Shutsemau / Kirill A. Shutemov