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[68.147.0.187]) by smtp.gmail.com with ESMTPSA id 23sm15486229pgv.90.2021.06.01.13.03.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Jun 2021 13:03:13 -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=bw6uvOLKEisckETLGn7QqEllExX+W/+p46wjCLwcazI=; b=Zn4t39gQjDWPIh9hs4r3J4Igjv/8VduTKdW0SvyAD31aQjYr9nNhOdx7WdLup8ObT8 cOAvzax7p3PaTVTiGoj+RzgPmBK3tdgKwL+HnDkyuFENcY48adRnE7jGwWSYJ3ufTqRD GH4dgE6JdOSSuDiF/ykNqTuiMOctw7NnzIj7MWPBPpdUwqVVFslkZpbuNHPUsOQFhOak Aullbw6hDLfz/ens9AWZAxOjfLRPYzCP43L9ZSD3lvX7C7HzFkfuYZPuQktvWWmcg316 pqARbDEEK6pXzj9SkNTcof2gw3zfgzyAyvwzHsJyfqusyuwmWqfn5y2KdGUIGWCmyfJS eAxA== 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=bw6uvOLKEisckETLGn7QqEllExX+W/+p46wjCLwcazI=; b=pB4PhsoUQftHr3Sf0GKaivjjhP9aGI0xiFLXvKsokyHy8qDcVVtroTr7dHhy2li7v7 wZaEos9+hW/CjEGmbBLa/kb3VJlQS3RLKrqtotXmVfGtMf/uBquPvltUvXcRxaf0sH0W VRe8QNTSOL6ljzVw0NPdlj8uTxdm9MrnJWzjHYWXIOSRMePfycexJvo4/StyfP0efgZm eNlyIKHITUHMUm1YDf4BhIKwwXfr/8jHQvGp9DhRkrgyuBpxRPzt+zc8eyqvU3cdvj1B 5whZu2rRaCQQc95QngZfjuxXSFaaN6icq081qZU2B4fOmMBCpjc1giDj8WoHkQ+kA/e2 3WJA== X-Gm-Message-State: AOAM530+/1/+5GeW6aBSTSiMBTljioehJiCy53iYOboL1mry6hVw3EuI eQj9r44wlO9kbNCz0cMixTG8gw== X-Google-Smtp-Source: ABdhPJxmHWEHDPOVaZ/BiGHUlG65MvDjMANP/XwmRwLFdFULf1pbcr3vIQryNdAQTGg2UvR1PyNx4A== X-Received: by 2002:a63:1613:: with SMTP id w19mr29419436pgl.379.1622577795398; Tue, 01 Jun 2021 13:03:15 -0700 (PDT) From: Mathieu Poirier To: mst@redhat.com Subject: [PATCH 4/5] docs: Add documentation for vhost based RNG implementation Date: Tue, 1 Jun 2021 14:03:04 -0600 Message-Id: <20210601200305.1772391-5-mathieu.poirier@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210601200305.1772391-1-mathieu.poirier@linaro.org> References: <20210601200305.1772391-1-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+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::42e; envelope-from=mathieu.poirier@linaro.org; helo=mail-pf1-x42e.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: viresh.kumar@linaro.org, alex.bennee@linaro.org, qemu-devel@nongnu.org, stratos-dev@op-lists.linaro.org Errors-To: qemu-devel-bounces+importer2=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) 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/vhost-user-rng.rst | 74 +++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 docs/tools/vhost-user-rng.rst 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