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 X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 92D2EC4320A for ; Tue, 3 Aug 2021 08:40:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6CA5260F56 for ; Tue, 3 Aug 2021 08:40:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234593AbhHCIkU (ORCPT ); Tue, 3 Aug 2021 04:40:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56046 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234423AbhHCIkT (ORCPT ); Tue, 3 Aug 2021 04:40:19 -0400 Received: from mail-ed1-x531.google.com (mail-ed1-x531.google.com [IPv6:2a00:1450:4864:20::531]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B9DF9C061764 for ; Tue, 3 Aug 2021 01:40:08 -0700 (PDT) Received: by mail-ed1-x531.google.com with SMTP id v20so13961286eda.1 for ; Tue, 03 Aug 2021 01:40:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=CRakoksKAuPF3/d2S73RYrpu1epFEAqqfntqG1htuL4=; b=znB/3Myq5X4zIUS4gde9Mg9tjF1aDURQoZRlblRrqyGfbh4thbo1YaTMC3saVRKlPP 674PLsaWG5jbekrevWBMIoUcWWthld+vntKBZb4jvxn+hlJwNqMA1fH1WSmw5KoYsi+0 S0O2YjFpmJDAdotybDaOg8jaDusDTfgpfi7xfwxyuo/GLh4XEjfPYJRUItJxzXn4mNNo oKJVunX+F1ZH7M6+vhPA0Z0B3HKoIZDUl+7NUcleOOSpjexBogw+aT2kprwNAXZhGo6j RrhwGmeD9j3EVhN69gd7/7zGDkMHX1+M2PspnLojdVAG6o86HlgS5lmHP1mCqaqF4vtm hsxw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=CRakoksKAuPF3/d2S73RYrpu1epFEAqqfntqG1htuL4=; b=AKUzIVTWDylAx7pNSH/wkl4xbA8Uey0WXv3iq9sKe1iRaQ/2AOJfjK1jwxFITBmmo+ lf2oKndssfitZnlr9FoBJmppyr3/XjsSg6S6ItlcF6Co7PU3/V9VelEN3mgl96SOmuKC xyjbG9WDnuCvETGS/LwxGJHTBfk9ZeXGjNgMOFOgCBK4VC8fy+TwNG4KjMbBKinBfeV/ HLlA/rdH6Dho7AKRHbGxMgVsXSz/X57VDv3RgZF6EiLCNlZbcQbMWVRHd0OelzctgSxo QR9LgtaKvaid0FxnPQMuiXKRd8+OI2pvNLSk+82UY2O+DV1u2uwclFqG0tsgBFb2vB4Z I/gA== X-Gm-Message-State: AOAM5336Eu/m3lGt0/43oSJzrg2+LjKdaiuAkHqjwU7iciyMLScHAI/1 r+0qKKoBvmT2otvsT/XAQ0adkEPplgY4liwXymBM X-Google-Smtp-Source: ABdhPJziVMvbOy20Edn+NVtfYzb6y08nWOl2Zx+frMXDG7ucgHCSE76xDftYnLe8xR0cQVvoPf0Q/Fgl17K812vHpL0= X-Received: by 2002:a05:6402:74f:: with SMTP id p15mr23843570edy.195.1627980007349; Tue, 03 Aug 2021 01:40:07 -0700 (PDT) MIME-Version: 1.0 References: <20210729073503.187-1-xieyongji@bytedance.com> <20210729073503.187-17-xieyongji@bytedance.com> In-Reply-To: From: Yongji Xie Date: Tue, 3 Aug 2021 16:39:56 +0800 Message-ID: Subject: Re: [PATCH v10 16/17] vduse: Introduce VDUSE - vDPA Device in Userspace To: Jason Wang Cc: "Michael S. Tsirkin" , Stefan Hajnoczi , Stefano Garzarella , Parav Pandit , Christoph Hellwig , Christian Brauner , Randy Dunlap , Matthew Wilcox , Al Viro , Jens Axboe , bcrl@kvack.org, Jonathan Corbet , =?UTF-8?Q?Mika_Penttil=C3=A4?= , Dan Carpenter , joro@8bytes.org, Greg KH , He Zhe , Liu Xiaodong , Joe Perches , songmuchun@bytedance.com, virtualization , netdev@vger.kernel.org, kvm , linux-fsdevel@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 3, 2021 at 3:30 PM Jason Wang wrote: > > > =E5=9C=A8 2021/7/29 =E4=B8=8B=E5=8D=883:35, Xie Yongji =E5=86=99=E9=81=93= : > > This VDUSE driver enables implementing software-emulated vDPA > > devices in userspace. The vDPA device is created by > > ioctl(VDUSE_CREATE_DEV) on /dev/vduse/control. Then a char device > > interface (/dev/vduse/$NAME) is exported to userspace for device > > emulation. > > > > In order to make the device emulation more secure, the device's > > control path is handled in kernel. A message mechnism is introduced > > to forward some dataplane related control messages to userspace. > > > > And in the data path, the DMA buffer will be mapped into userspace > > address space through different ways depending on the vDPA bus to > > which the vDPA device is attached. In virtio-vdpa case, the MMU-based > > software IOTLB is used to achieve that. And in vhost-vdpa case, the > > DMA buffer is reside in a userspace memory region which can be shared > > to the VDUSE userspace processs via transferring the shmfd. > > > > For more details on VDUSE design and usage, please see the follow-on > > Documentation commit. > > > > Signed-off-by: Xie Yongji > > --- > > Documentation/userspace-api/ioctl/ioctl-number.rst | 1 + > > drivers/vdpa/Kconfig | 10 + > > drivers/vdpa/Makefile | 1 + > > drivers/vdpa/vdpa_user/Makefile | 5 + > > drivers/vdpa/vdpa_user/vduse_dev.c | 1541 +++++++++++= +++++++++ > > include/uapi/linux/vduse.h | 220 +++ > > 6 files changed, 1778 insertions(+) > > create mode 100644 drivers/vdpa/vdpa_user/Makefile > > create mode 100644 drivers/vdpa/vdpa_user/vduse_dev.c > > create mode 100644 include/uapi/linux/vduse.h > > > > diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Docum= entation/userspace-api/ioctl/ioctl-number.rst > > index 1409e40e6345..293ca3aef358 100644 > > --- a/Documentation/userspace-api/ioctl/ioctl-number.rst > > +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst > > @@ -300,6 +300,7 @@ Code Seq# Include File = Comments > > 'z' 10-4F drivers/s390/crypto/zcrypt_api.h = conflict! > > '|' 00-7F linux/media.h > > 0x80 00-1F linux/fb.h > > +0x81 00-1F linux/vduse.h > > 0x89 00-06 arch/x86/include/asm/sockios.h > > 0x89 0B-DF linux/sockios.h > > 0x89 E0-EF linux/sockios.h = SIOCPROTOPRIVATE range > > diff --git a/drivers/vdpa/Kconfig b/drivers/vdpa/Kconfig > > index a503c1b2bfd9..6e23bce6433a 100644 > > --- a/drivers/vdpa/Kconfig > > +++ b/drivers/vdpa/Kconfig > > @@ -33,6 +33,16 @@ config VDPA_SIM_BLOCK > > vDPA block device simulator which terminates IO request in a > > memory buffer. > > > > +config VDPA_USER > > + tristate "VDUSE (vDPA Device in Userspace) support" > > + depends on EVENTFD && MMU && HAS_DMA > > + select DMA_OPS > > + select VHOST_IOTLB > > + select IOMMU_IOVA > > + help > > + With VDUSE it is possible to emulate a vDPA Device > > + in a userspace program. > > + > > config IFCVF > > tristate "Intel IFC VF vDPA driver" > > depends on PCI_MSI > > diff --git a/drivers/vdpa/Makefile b/drivers/vdpa/Makefile > > index 67fe7f3d6943..f02ebed33f19 100644 > > --- a/drivers/vdpa/Makefile > > +++ b/drivers/vdpa/Makefile > > @@ -1,6 +1,7 @@ > > # SPDX-License-Identifier: GPL-2.0 > > obj-$(CONFIG_VDPA) +=3D vdpa.o > > obj-$(CONFIG_VDPA_SIM) +=3D vdpa_sim/ > > +obj-$(CONFIG_VDPA_USER) +=3D vdpa_user/ > > obj-$(CONFIG_IFCVF) +=3D ifcvf/ > > obj-$(CONFIG_MLX5_VDPA) +=3D mlx5/ > > obj-$(CONFIG_VP_VDPA) +=3D virtio_pci/ > > diff --git a/drivers/vdpa/vdpa_user/Makefile b/drivers/vdpa/vdpa_user/M= akefile > > new file mode 100644 > > index 000000000000..260e0b26af99 > > --- /dev/null > > +++ b/drivers/vdpa/vdpa_user/Makefile > > @@ -0,0 +1,5 @@ > > +# SPDX-License-Identifier: GPL-2.0 > > + > > +vduse-y :=3D vduse_dev.o iova_domain.o > > + > > +obj-$(CONFIG_VDPA_USER) +=3D vduse.o > > diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_use= r/vduse_dev.c > > new file mode 100644 > > index 000000000000..6addc62e7de6 > > --- /dev/null > > +++ b/drivers/vdpa/vdpa_user/vduse_dev.c > > @@ -0,0 +1,1541 @@ > > +// SPDX-License-Identifier: GPL-2.0-only > > +/* > > + * VDUSE: vDPA Device in Userspace > > + * > > + * Copyright (C) 2020-2021 Bytedance Inc. and/or its affiliates. All r= ights reserved. > > + * > > + * Author: Xie Yongji > > + * > > + */ > > + > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > + > > +#include "iova_domain.h" > > + > > +#define DRV_AUTHOR "Yongji Xie " > > +#define DRV_DESC "vDPA Device in Userspace" > > +#define DRV_LICENSE "GPL v2" > > + > > +#define VDUSE_DEV_MAX (1U << MINORBITS) > > +#define VDUSE_BOUNCE_SIZE (64 * 1024 * 1024) > > +#define VDUSE_IOVA_SIZE (128 * 1024 * 1024) > > +#define VDUSE_REQUEST_TIMEOUT 30 > > > I think we need make this as a module parameter. 0 probably means we > need to wait for ever. > > This can help in the case when the userspace is attached by GDB. If > Michael is still not happy, we can find other solution (e.g only offload > the datapath). > OK, a device attribute might be better. Thanks, Yongji 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 X-Spam-Level: X-Spam-Status: No, score=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_RED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 802F6C4338F for ; Tue, 3 Aug 2021 08:40:15 +0000 (UTC) Received: from smtp1.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 04DB760F58 for ; Tue, 3 Aug 2021 08:40:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 04DB760F58 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=bytedance.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp1.osuosl.org (Postfix) with ESMTP id C0BF18280E; Tue, 3 Aug 2021 08:40:14 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp1.osuosl.org ([127.0.0.1]) by localhost (smtp1.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1MTxoWTQo22q; Tue, 3 Aug 2021 08:40:13 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [IPv6:2605:bc80:3010:104::8cd3:938]) by smtp1.osuosl.org (Postfix) with ESMTPS id 751FE82792; Tue, 3 Aug 2021 08:40:13 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 4D748C0010; Tue, 3 Aug 2021 08:40:13 +0000 (UTC) Received: from smtp1.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 33E73C0010 for ; Tue, 3 Aug 2021 08:40:11 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp1.osuosl.org (Postfix) with ESMTP id 156CC82792 for ; Tue, 3 Aug 2021 08:40:11 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp1.osuosl.org ([127.0.0.1]) by localhost (smtp1.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UJDI9Ne2ArPu for ; Tue, 3 Aug 2021 08:40:10 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.8.0 Received: from mail-ed1-x52c.google.com (mail-ed1-x52c.google.com [IPv6:2a00:1450:4864:20::52c]) by smtp1.osuosl.org (Postfix) with ESMTPS id A57DC827C6 for ; Tue, 3 Aug 2021 08:40:09 +0000 (UTC) Received: by mail-ed1-x52c.google.com with SMTP id p21so27996986edi.9 for ; Tue, 03 Aug 2021 01:40:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=CRakoksKAuPF3/d2S73RYrpu1epFEAqqfntqG1htuL4=; b=znB/3Myq5X4zIUS4gde9Mg9tjF1aDURQoZRlblRrqyGfbh4thbo1YaTMC3saVRKlPP 674PLsaWG5jbekrevWBMIoUcWWthld+vntKBZb4jvxn+hlJwNqMA1fH1WSmw5KoYsi+0 S0O2YjFpmJDAdotybDaOg8jaDusDTfgpfi7xfwxyuo/GLh4XEjfPYJRUItJxzXn4mNNo oKJVunX+F1ZH7M6+vhPA0Z0B3HKoIZDUl+7NUcleOOSpjexBogw+aT2kprwNAXZhGo6j RrhwGmeD9j3EVhN69gd7/7zGDkMHX1+M2PspnLojdVAG6o86HlgS5lmHP1mCqaqF4vtm hsxw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=CRakoksKAuPF3/d2S73RYrpu1epFEAqqfntqG1htuL4=; b=V3CWjoxm7hIg4FackvyFooOTJ2BABzI3XseiEcYuYbvtDaQAoa3kyz8F3GVBplGCMC gS+zqMvZNICyU+mLC0/ngs6hu7ftarX2jAgMxhOYgl4KYbaBsf3uZguT4BNTW0XhNUgp FG4l9Qfnj5Sullv0yhJhgMvfPOeMm2Byi/Mf58JWw3clzfh0fdJ0oYzlV3t4cCzcuWyc rCMsXsuN6OQO75g+PP7LjLSZ+Os+6bOJKvZpWS06yahFZSK+HCj557/WuhbS6HKC7eqF v/VfjNgI9Bl7WvoVp600+axJO5FzdHHCsa5ug3mhScijypCkCgJL9ReUV38jMpXpv0qL JuEw== X-Gm-Message-State: AOAM530P6rWIcon91m4FALyEeSaIN+W67JEptLGvDyRjQqY1WLS227QR xRJ8Qxp/WagmyLPP4jv9qPi4hYYJcfdFICXPoX9Y X-Google-Smtp-Source: ABdhPJziVMvbOy20Edn+NVtfYzb6y08nWOl2Zx+frMXDG7ucgHCSE76xDftYnLe8xR0cQVvoPf0Q/Fgl17K812vHpL0= X-Received: by 2002:a05:6402:74f:: with SMTP id p15mr23843570edy.195.1627980007349; Tue, 03 Aug 2021 01:40:07 -0700 (PDT) MIME-Version: 1.0 References: <20210729073503.187-1-xieyongji@bytedance.com> <20210729073503.187-17-xieyongji@bytedance.com> In-Reply-To: From: Yongji Xie Date: Tue, 3 Aug 2021 16:39:56 +0800 Message-ID: Subject: Re: [PATCH v10 16/17] vduse: Introduce VDUSE - vDPA Device in Userspace To: Jason Wang Cc: kvm , "Michael S. Tsirkin" , virtualization , Christian Brauner , Jonathan Corbet , Matthew Wilcox , Christoph Hellwig , Dan Carpenter , Stefano Garzarella , Liu Xiaodong , linux-fsdevel@vger.kernel.org, Al Viro , Stefan Hajnoczi , songmuchun@bytedance.com, Jens Axboe , He Zhe , Greg KH , Randy Dunlap , linux-kernel , iommu@lists.linux-foundation.org, bcrl@kvack.org, netdev@vger.kernel.org, Joe Perches , =?UTF-8?Q?Mika_Penttil=C3=A4?= X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" T24gVHVlLCBBdWcgMywgMjAyMSBhdCAzOjMwIFBNIEphc29uIFdhbmcgPGphc293YW5nQHJlZGhh dC5jb20+IHdyb3RlOgo+Cj4KPiDlnKggMjAyMS83LzI5IOS4i+WNiDM6MzUsIFhpZSBZb25namkg 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