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=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS 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 4E7C9C04AB4 for ; Tue, 14 May 2019 14:52:30 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D33C02084E for ; Tue, 14 May 2019 14:52:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D33C02084E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([127.0.0.1]:49347 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hQYn6-0001IM-QX for qemu-devel@archiver.kernel.org; Tue, 14 May 2019 10:52:28 -0400 Received: from eggs.gnu.org ([209.51.188.92]:43851) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hQYle-0000TX-7x for qemu-devel@nongnu.org; Tue, 14 May 2019 10:50:59 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hQYlc-0002Ux-TO for qemu-devel@nongnu.org; Tue, 14 May 2019 10:50:58 -0400 Received: from mx1.redhat.com ([209.132.183.28]:51082) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hQYlc-0002UA-Ln for qemu-devel@nongnu.org; Tue, 14 May 2019 10:50:56 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id BFF5F3082133; Tue, 14 May 2019 14:50:55 +0000 (UTC) Received: from blackfin.pond.sub.org (ovpn-116-28.ams2.redhat.com [10.36.116.28]) by smtp.corp.redhat.com (Postfix) with ESMTPS id D3F295D729; Tue, 14 May 2019 14:50:52 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id 52F3711385E4; Tue, 14 May 2019 16:50:47 +0200 (CEST) From: Markus Armbruster To: Laurent Vivier References: <20190514075602.7674-1-lvivier@redhat.com> <20190514075602.7674-3-lvivier@redhat.com> Date: Tue, 14 May 2019 16:50:47 +0200 In-Reply-To: <20190514075602.7674-3-lvivier@redhat.com> (Laurent Vivier's message of "Tue, 14 May 2019 09:56:01 +0200") Message-ID: <87bm05dr94.fsf@dusky.pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.42]); Tue, 14 May 2019 14:50:55 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] [PATCH v4 2/3] rng-builtin: add an RNG backend that uses qemu_guest_getrandom() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Daniel P . =?utf-8?Q?Berrang=C3=A9?=" , "Michael S. Tsirkin" , Amit Shah , Richard Henderson , qemu-devel@nongnu.org, "Richard W . M . Jones" , Kashyap Chamarthy Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Laurent Vivier writes: > Add a new RNG backend using QEMU builtin getrandom function. > > It can be created and used with something like: > > ... -object rng-builtin,id=rng0 -device virtio-rng,rng=rng0 ... > > Reviewed-by: Richard Henderson > Signed-off-by: Laurent Vivier > --- > backends/Makefile.objs | 2 +- > backends/rng-builtin.c | 56 ++++++++++++++++++++++++++++++++++++++++++ > qemu-options.hx | 10 +++++++- > 3 files changed, 66 insertions(+), 2 deletions(-) > create mode 100644 backends/rng-builtin.c > > diff --git a/backends/Makefile.objs b/backends/Makefile.objs > index 981e8e122f2c..f0691116e86e 100644 > --- a/backends/Makefile.objs > +++ b/backends/Makefile.objs > @@ -1,4 +1,4 @@ > -common-obj-y += rng.o rng-egd.o > +common-obj-y += rng.o rng-egd.o rng-builtin.o > common-obj-$(CONFIG_POSIX) += rng-random.o > > common-obj-$(CONFIG_TPM) += tpm.o > diff --git a/backends/rng-builtin.c b/backends/rng-builtin.c > new file mode 100644 > index 000000000000..b1264b745407 > --- /dev/null > +++ b/backends/rng-builtin.c > @@ -0,0 +1,56 @@ > +/* > + * QEMU Builtin Random Number Generator Backend > + * > + * This work is licensed under the terms of the GNU GPL, version 2 or later. > + * See the COPYING file in the top-level directory. > + */ > + > +#include "qemu/osdep.h" > +#include "sysemu/rng.h" > +#include "qapi/error.h" > +#include "qapi/qmp/qerror.h" Two superfluous includes, please drop them. > +#include "qemu/main-loop.h" > +#include "qemu/guest-random.h" > + > +#define TYPE_RNG_BUILTIN "rng-builtin" > +#define RNG_BUILTIN(obj) OBJECT_CHECK(RngBuiltin, (obj), TYPE_RNG_BUILTIN) > + > +typedef struct RngBuiltin { > + RngBackend parent; > +} RngBuiltin; > + > +static void rng_builtin_request_entropy(RngBackend *b, RngRequest *req) > +{ > + RngBuiltin *s = RNG_BUILTIN(b); > + > + while (!QSIMPLEQ_EMPTY(&s->parent.requests)) { > + RngRequest *req = QSIMPLEQ_FIRST(&s->parent.requests); > + > + qemu_guest_getrandom_nofail(req->data, req->size); > + > + req->receive_entropy(req->opaque, req->data, req->size); > + > + rng_backend_finalize_request(&s->parent, req); > + } > +} > + > +static void rng_builtin_class_init(ObjectClass *klass, void *data) > +{ > + RngBackendClass *rbc = RNG_BACKEND_CLASS(klass); > + > + rbc->request_entropy = rng_builtin_request_entropy; > +} > + > +static const TypeInfo rng_builtin_info = { > + .name = TYPE_RNG_BUILTIN, > + .parent = TYPE_RNG_BACKEND, > + .instance_size = sizeof(RngBuiltin), > + .class_init = rng_builtin_class_init, > +}; > + > +static void register_types(void) > +{ > + type_register_static(&rng_builtin_info); > +} > + > +type_init(register_types); > diff --git a/qemu-options.hx b/qemu-options.hx > index 4df0ea3aed5c..6ab920f12be4 100644 > --- a/qemu-options.hx > +++ b/qemu-options.hx > @@ -4280,13 +4280,21 @@ other options. > > The @option{share} boolean option is @var{on} by default with memfd. > > +@item -object rng-builtin,id=@var{id} > + > +Creates a random number generator backend which obtains entropy from > +QEMU builtin functions. The @option{id} parameter is a unique ID that > +will be used to reference this entropy backend from the @option{virtio-rng} > +device. > + > @item -object rng-random,id=@var{id},filename=@var{/dev/random} > > Creates a random number generator backend which obtains entropy from > a device on the host. The @option{id} parameter is a unique ID that > will be used to reference this entropy backend from the @option{virtio-rng} > device. The @option{filename} parameter specifies which file to obtain > -entropy from and if omitted defaults to @option{/dev/urandom}. > +entropy from and if omitted defaults to @option{/dev/urandom}. By default, > +the @option{virtio-rng} device uses this RNG backend. > > @item -object rng-egd,id=@var{id},chardev=@var{chardevid} I'd drop the change to rng-random's documentation. With at least the includes tidied up: Reviewed-by: Markus Armbruster