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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A7E5DC433EF for ; Mon, 4 Apr 2022 15:08:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1378221AbiDDPKY (ORCPT ); Mon, 4 Apr 2022 11:10:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60136 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1357038AbiDDPKW (ORCPT ); Mon, 4 Apr 2022 11:10:22 -0400 Received: from mail-pj1-x1032.google.com (mail-pj1-x1032.google.com [IPv6:2607:f8b0:4864:20::1032]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7FA361A6 for ; Mon, 4 Apr 2022 08:08:26 -0700 (PDT) Received: by mail-pj1-x1032.google.com with SMTP id gt4so3176266pjb.4 for ; Mon, 04 Apr 2022 08:08:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=0gwspQdPDB+l/Evv+qDfnRBGPMoJjcgtCyWMziDMDbw=; b=hVVppLVEIKOd82GVdqWMG3js+ldLAHtSIobmi7A4LWoaiYiKBgKy/aU64j2EDSZxl6 LOlXrKH6CBZ9bRii+9GlASC1fvlOJU2fxVj2K8QJxANsVTze6MpIxYYJ1jr02NxfHUMC PWYF+Yd3xGlRJYVadHe7nYMhqxssWBOjZ6vnI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=0gwspQdPDB+l/Evv+qDfnRBGPMoJjcgtCyWMziDMDbw=; b=eHBBYnWDOZWMxAwjKja/2jsTAMBXM5KOZuXajZyJ+2QpZt7KLI7Uotw5dLPO1iIx5O /Oi5+EQiB/mqN1hcUMzBc28i4h0NnzYgb18QOTYCYegbjoeuWwKS7zh/2RgNpKjOaG8R VQhtOPisVqL+UevbrEFwwgPsYVwrPqcpbarDco/BfYFS1XWlniGtlbzn3prWUOlcUJV/ tqlOF2MPEG0W/DSxpgb5DKVIF3zwy6RHPD5r9ToO26g5q9noGAsCrDzT5ya64HYlUnzB G+UobBMgt59LOtFSTzrYeTTQIZcWd+v8CcvX88s2gGUkTADb+FvOwKGQKEMNziC4DAAX IDyg== X-Gm-Message-State: AOAM531ozdGCxodRNika1mvp4eRzrCD6rdQpxD5HvRXzQMzKSsyj1wdy rUGl28bchDL4lQokzi+HiUOq2e5SmNmD20aZq/oeiQ== X-Google-Smtp-Source: ABdhPJynDbSf3VDPHza7P3Xsb8p4OJ8VYsFc93Ry4MaVrsubBeezlT6LhHNhBKFAed/YdG7xRaeBbpx7asYuSFbH8O8= X-Received: by 2002:a17:902:868d:b0:154:4d09:5827 with SMTP id g13-20020a170902868d00b001544d095827mr312313plo.21.1649084905921; Mon, 04 Apr 2022 08:08:25 -0700 (PDT) MIME-Version: 1.0 References: <20220329180616.22547-1-sumit.saxena@broadcom.com> <20220329180616.22547-3-sumit.saxena@broadcom.com> <8a3dfb77-9c42-871a-0d16-1ddf84516c8e@acm.org> In-Reply-To: <8a3dfb77-9c42-871a-0d16-1ddf84516c8e@acm.org> From: Sumit Saxena Date: Mon, 4 Apr 2022 20:37:59 +0530 Message-ID: Subject: Re: [PATCH v2 2/7] mpi3mr: add support for driver commands To: Bart Van Assche Cc: Linux SCSI List , "Martin K. Petersen" , Sathya Prakash Veerichetty , Kashyap Desai , Chandrakanth Patil , Sreekanth Reddy , Prayas Patel , Christoph Hellwig Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000000b198005dbd58043" Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org --0000000000000b198005dbd58043 Content-Type: text/plain; charset="UTF-8" On Mon, Apr 4, 2022 at 7:55 PM Bart Van Assche wrote: > > On 3/29/22 11:06, Sumit Saxena wrote: > > +/** > > + * struct mpi3mr_nvme_pt_sge - Structure to store SGEs for NVMe > > + * Encapsulated commands. > > + * > > + * @base_addr: Physical address > > + * @length: SGE length > > + * @rsvd: Reserved > > + * @rsvd1: Reserved > > + * @sgl_type: sgl type > > + */ > > +struct mpi3mr_nvme_pt_sge { > > + u64 base_addr; > > + u32 length; > > + u16 rsvd; > > + u8 rsvd1; > > + u8 sgl_type; > > +}; > > Does the above data structure force user space software to pass a > physical address to the kernel? A kernel driver should not do this > unless there is a very good reason to do so. Passing a physical address > from user space to the kernel requires freezing the virtual-to-physical > mapping. Some user space developers erroneously use mlock() for this > purpose. Is there any other way than the VFIO_IOMMU_MAP_DMA ioctl to > prevent that the kernel modifies the virtual-to-physical mapping? This structure is not for user space consumption. Mistakenly, it's moved to this header. Will fix it in the next revision. Thanks, Sumit > > Thanks, > > Bart. --0000000000000b198005dbd58043 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQbQYJKoZIhvcNAQcCoIIQXjCCEFoCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg3EMIIFDTCCA/WgAwIBAgIQeEqpED+lv77edQixNJMdADANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA5MTYwMDAwMDBaFw0yODA5MTYwMDAwMDBaMFsxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMTEwLwYDVQQDEyhHbG9iYWxTaWduIEdDQyBS MyBQZXJzb25hbFNpZ24gMiBDQSAyMDIwMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA vbCmXCcsbZ/a0fRIQMBxp4gJnnyeneFYpEtNydrZZ+GeKSMdHiDgXD1UnRSIudKo+moQ6YlCOu4t rVWO/EiXfYnK7zeop26ry1RpKtogB7/O115zultAz64ydQYLe+a1e/czkALg3sgTcOOcFZTXk38e aqsXsipoX1vsNurqPtnC27TWsA7pk4uKXscFjkeUE8JZu9BDKaswZygxBOPBQBwrA5+20Wxlk6k1 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