From nobody Tue Feb 10 03:39:36 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=linaro.org ARC-Seal: i=1; a=rsa-sha256; t=1625878999; cv=none; d=zohomail.com; s=zohoarc; b=RNj/K+wy4tS9RPc6hUzwJCbgbVxA32J3Ma2AAjt7iDt7Wv+r1U5+Dl3oyFGiuJvfJoq+6GO2UCl4yQsLhF+Zx3pkpZCSMoM8G6DYfwPOHVYQEiF2dDnApO0kpv/P6NtQ2+wKqcPmOws3q/mpp2r1DYYelL/Ti+SFeSULZIbj3PA= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1625878999; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=wFYtFiPzC96CwY/OVNRqzz3Vjx6DTMRTmatLGw5Tynw=; b=C/dAb0zUuyXWnRkD+GRd9cjYhufvjpxEFlIfyNGZZqlL1Sr2tUqJQXmjo1qTs+tFC8SFA8eDgc0Lmtz4btCDo5DS4LL8N5Fw4yTmTRgPXRJtyjbK/AXsX5/4b80CxqyBKcXzXWMN2sbwBf7rbcsV0kaszRB5uoycFKa18xh560Y= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1625878999817349.43888893219844; Fri, 9 Jul 2021 18:03:19 -0700 (PDT) Received: from localhost ([::1]:51054 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m21Oo-0003yr-NS for importer@patchew.org; Fri, 09 Jul 2021 21:03:18 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:47632) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m21LL-0001Al-Ef for qemu-devel@nongnu.org; Fri, 09 Jul 2021 20:59:44 -0400 Received: from mail-pl1-x635.google.com ([2607:f8b0:4864:20::635]:34370) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1m21LG-0005dv-I5 for qemu-devel@nongnu.org; Fri, 09 Jul 2021 20:59:43 -0400 Received: by mail-pl1-x635.google.com with SMTP id o4so5907526plg.1 for ; Fri, 09 Jul 2021 17:59:38 -0700 (PDT) Received: from p14s.cg.shawcable.net (S0106889e681aac74.cg.shawcable.net. [68.147.0.187]) by smtp.gmail.com with ESMTPSA id w2sm6420932pjq.5.2021.07.09.17.59.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Jul 2021 17:59:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=wFYtFiPzC96CwY/OVNRqzz3Vjx6DTMRTmatLGw5Tynw=; b=n9fCSJ/dTZP1ltoQJ+pExAjiHd/tR6YTrn7WGlJQ8SdXhlsTOGhZYkbcBpFHJX1HBk kRXPAnPXNteQmZTnw3Lh2ppf/T/d80GmQwcx3paqumhzw8vMfegmvl9bZ15DoTfQa8O7 n/ss5DWBsxIl0BllPVUq8eBfhxL4K97+7vwZX44AZKh1+g4FQaGrKzdcXptn2xGU3Eq7 WhqMHxKncdSxMp7p1HeiIWsp0sDuYAgKwigEMl2Cnx+y+zZzXatEbv71hiV9FLGdIoSC tZQhjWexdIlmU2alGppwtIyVwPxqtS1XvK9u8iI+M1OuVarYQzFPAmlJ30SLBVGfgc63 N7LQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=wFYtFiPzC96CwY/OVNRqzz3Vjx6DTMRTmatLGw5Tynw=; b=E76OBigF0/FlBG0P59n6wp83h1EOw2uyM0droe3cBF+UxBd5DhCcSEM/GE1moWgXG8 0f4yvvDKMF2MGOnHxC8PQ5ZODxl5Sytt8oq8itOjsUmLSWN4Iz8mtHxR9eOGxo+iTToG vh0MKR56Tr900RI+gsJeztOe8T3CP0rdxpBMV/Xv2EbW4SMamsvVKW5TCMxWqPysCWPU oN/JV/gfcL/CXmYr8g1k2rc6XJiQCmv3Aoy0/uCDK0+xurJu1QxELOLAlEMLwsAMGSO/ O6xTXV83GgTNi0aTRcNdQrcUZCs7ITIsRZDWmeA1AmfKPXt55ukelfotK9cbNpvhpzB0 xB+A== X-Gm-Message-State: AOAM530jgQnmLyJhw+8RZ+6Q+uBKrBM0fefAjS8FsKbJf675Nxz7W6CZ 5bzMvPCZTeiLPjuBQzZg6afP2ydaUVuNhw== X-Google-Smtp-Source: ABdhPJyrC7NYRgec916LnszEe2FDHbyUKZO4DOa+xvKy2JVDyYVsr0hFWXzFRMlV2C8OR2wD5TwV+A== X-Received: by 2002:a17:90a:6394:: with SMTP id f20mr1571906pjj.80.1625878777333; Fri, 09 Jul 2021 17:59:37 -0700 (PDT) From: Mathieu Poirier To: mst@redhat.com, alex.bennee@linaro.org Subject: [PATCH v3 4/4] docs: Add documentation for vhost based RNG implementation Date: Fri, 9 Jul 2021 18:59:29 -0600 Message-Id: <20210710005929.1702431-5-mathieu.poirier@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210710005929.1702431-1-mathieu.poirier@linaro.org> References: <20210710005929.1702431-1-mathieu.poirier@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::635; envelope-from=mathieu.poirier@linaro.org; helo=mail-pl1-x635.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1625879002076100001 Content-Type: text/plain; charset="utf-8" Add description and example for the vhost-user based RNG implementation. Tailored on Viresh Kumar's vhost-user-i2c documentation. Signed-off-by: Mathieu Poirier --- docs/tools/index.rst | 1 + docs/tools/vhost-user-rng.rst | 74 +++++++++++++++++++++++++++++++++++ 2 files changed, 75 insertions(+) create mode 100644 docs/tools/vhost-user-rng.rst diff --git a/docs/tools/index.rst b/docs/tools/index.rst index d923834a7398..9d80fa89eceb 100644 --- a/docs/tools/index.rst +++ b/docs/tools/index.rst @@ -15,5 +15,6 @@ Contents: qemu-nbd qemu-pr-helper qemu-trace-stap + vhost-user-rng virtfs-proxy-helper virtiofsd diff --git a/docs/tools/vhost-user-rng.rst b/docs/tools/vhost-user-rng.rst new file mode 100644 index 000000000000..7f69d7bb3c58 --- /dev/null +++ b/docs/tools/vhost-user-rng.rst @@ -0,0 +1,74 @@ +QEMU vhost-user-rng - RNG emulation backend +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +Synopsis +-------- + +**vhost-user-rng** [*OPTIONS*] + +Description +----------- + +This program is a vhost-user backend that emulates a VirtIO random number +generator (RNG). It uses the host's random number generator pool, +/dev/urandom by default but configurable at will, to satisfy requests from +guests. + +This program is designed to work with QEMU's ``-device +vhost-user-rng-pci`` but should work with any virtual machine monitor +(VMM) that supports vhost-user. See the Examples section below. + +Options +------- + +.. program:: vhost-user-rng + +.. option:: -h, --help + + Print help. + +.. option:: -v, --verbose + + Increase verbosity of output + +.. option:: -s, --socket-path=3DPATH + + Listen on vhost-user UNIX domain socket at PATH. Incompatible with --fd. + +.. option:: -f, --fd=3DFDNUM + + Accept connections from vhost-user UNIX domain socket file descriptor FD= NUM. + The file descriptor must already be listening for connections. + Incompatible with --socket-path. + +.. option:: -p, --period + + Rate, in milliseconds, at which the RNG hardware can generate random dat= a. + Used in conjunction with the --max-bytes option. + +.. option:: -m, --max-bytes + + In conjuction with the --period parameter, provides the maximum number o= f byte + per milliseconds a RNG device can generate. + +Examples +-------- + +The daemon should be started first: + +:: + + host# vhost-user-rng --socket-path=3Drng.sock --period=3D1000 --max-byte= s=3D4096 + +The QEMU invocation needs to create a chardev socket the device can +use to communicate as well as share the guests memory over a memfd. + +:: + + host# qemu-system \ + -chardev socket,path=3D$(PATH)/rng.sock,id=3Drng0 \ + -device vhost-user-rng-pci,chardev=3Drng0 \ + -m 4096 \ + -object memory-backend-file,id=3Dmem,size=3D4G,mem-path=3D/dev/shm,s= hare=3Don \ + -numa node,memdev=3Dmem \ + ... --=20 2.25.1