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[src/trunk]: src Add viornd(4), a driver for the VirtIO entropy source availa...
details: https://anonhg.NetBSD.org/src/rev/8bee2346eb6e
branches: trunk
changeset: 803417:8bee2346eb6e
user: tls <tls%NetBSD.org@localhost>
date: Sun Oct 26 18:43:18 2014 +0000
description:
Add viornd(4), a driver for the VirtIO entropy source available on
QEMU, KVM, and Google Compute Engine. From OpenBSD.
diffstat:
doc/CHANGES | 6 +-
share/man/man4/viornd.4 | 61 ++++++++++
sys/arch/amd64/conf/GENERIC | 5 +-
sys/dev/pci/files.pci | 6 +-
sys/dev/pci/viornd.c | 249 ++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 322 insertions(+), 5 deletions(-)
diffs (truncated from 382 to 300 lines):
diff -r 1b434cb2491f -r 8bee2346eb6e doc/CHANGES
--- a/doc/CHANGES Sun Oct 26 18:33:43 2014 +0000
+++ b/doc/CHANGES Sun Oct 26 18:43:18 2014 +0000
@@ -1,4 +1,4 @@
-# LIST OF CHANGES FROM LAST RELEASE: <$Revision: 1.2004 $>
+# LIST OF CHANGES FROM LAST RELEASE: <$Revision: 1.2005 $>
#
#
# [Note: This file does not mention every change made to the NetBSD source tree.
@@ -87,5 +87,7 @@
sources (be more power friendly). [tls 20141026]
rnd(9): Make "skew" source polled so it runs only when there
is entropy demand. [tls 20141026]
- rnd(9): Adjust entropy collection from polled sources so it's
+ rnd(9): Adjust entropy collection from polled sources so it's
processed sooner. [tls 20141026]
+ viornd(4): Add driver for VirtIO entropy source available on
+ QEMU, KVM, and Google Compute Engine. From OpenBSD.
diff -r 1b434cb2491f -r 8bee2346eb6e share/man/man4/viornd.4
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/share/man/man4/viornd.4 Sun Oct 26 18:43:18 2014 +0000
@@ -0,0 +1,61 @@
+.\" $NetBSD: viornd.4,v 1.1 2014/10/26 18:43:18 tls Exp $
+.\"
+.\" Copyright (c) 2014 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Thor Lancelot Simon.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd October 26, 2014
+.Dt VIORND 4
+.Os
+.Sh NAME
+.Nm viornd
+.Nd VirtIO entropy source
+.Sh SYNOPSIS
+.Cd "viornd* at virtio?"
+.Sh DESCRIPTION
+When the system has entropy demand,
+the
+.Nm
+driver, used with a compatible hypervisor such as QEMU, KVM, or Google
+Compute Engine, requests entropy using the VirtIO random number interface
+and feeds it into the system entropy pool.
+.Sh SEE ALSO
+.Xr virtio 4 ,
+.Xr rnd 4
+.Sh HISTORY
+The
+.Nm
+driver appeared in
+.Ox 5.5 .
+.Sh AUTHORS
+The
+.Nm
+driver was written by Stephan Fritsch <sf%fritsch.de@localhost> and reworked to
+request entropy upon demand by Thor Lancelot Simon <tls%NetBSD.ORG@localhost>.
+.Sh CAVEATS
+VirtIO appears to support at least 8 pending entropy requests, but
+.Nm
+currently supports only one pending request at a time.
diff -r 1b434cb2491f -r 8bee2346eb6e sys/arch/amd64/conf/GENERIC
--- a/sys/arch/amd64/conf/GENERIC Sun Oct 26 18:33:43 2014 +0000
+++ b/sys/arch/amd64/conf/GENERIC Sun Oct 26 18:43:18 2014 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: GENERIC,v 1.400 2014/10/18 16:56:51 uebayasi Exp $
+# $NetBSD: GENERIC,v 1.401 2014/10/26 18:43:18 tls Exp $
#
# GENERIC machine description file
#
@@ -22,7 +22,7 @@
options INCLUDE_CONFIG_FILE # embed config file in kernel binary
-#ident "GENERIC-$Revision: 1.400 $"
+#ident "GENERIC-$Revision: 1.401 $"
maxusers 64 # estimated number of users
@@ -1171,6 +1171,7 @@
viomb* at virtio? # Virtio memory balloon device
ld* at virtio? # Virtio disk device
vioif* at virtio? # Virtio network device
+viornd* at virtio? # Virtio entropy device
# Pull in optional local configuration
diff -r 1b434cb2491f -r 8bee2346eb6e sys/dev/pci/files.pci
--- a/sys/dev/pci/files.pci Sun Oct 26 18:33:43 2014 +0000
+++ b/sys/dev/pci/files.pci Sun Oct 26 18:43:18 2014 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.pci,v 1.371 2014/03/19 15:26:41 nonaka Exp $
+# $NetBSD: files.pci,v 1.372 2014/10/26 18:43:18 tls Exp $
#
# Config file and device description for machine-independent PCI code.
# Included by ports that need it. Requires that the SCSI files be
@@ -1125,6 +1125,10 @@
attach vioif at virtio
file dev/pci/if_vioif.c vioif
+device viornd
+attach viornd at virtio
+file dev/pci/viornd.c viornd
+
# Silicon Motion SM712(LynxEM+) frame buffer
device lynxfb: wsemuldisplaydev, rasops16
attach lynxfb at pci
diff -r 1b434cb2491f -r 8bee2346eb6e sys/dev/pci/viornd.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/pci/viornd.c Sun Oct 26 18:43:18 2014 +0000
@@ -0,0 +1,249 @@
+/* $NetBSD: viornd.c,v 1.1 2014/10/26 18:43:18 tls Exp $ */
+/* $OpenBSD: viornd.c,v 1.1 2014/01/21 21:14:58 sf Exp $ */
+
+/*
+ * Copyright (c) 2014 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Thor Lancelot Simon (tls%NetBSD.org@localhost).
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * Copyright (c) 2014 Stefan Fritsch <sf%sfritsch.de@localhost>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/device.h>
+#include <sys/callout.h>
+#include <sys/rnd.h>
+#include <sys/mutex.h>
+#include <dev/pci/pcidevs.h>
+#include <dev/pci/pcivar.h>
+#include <dev/pci/pcivar.h>
+#include <dev/pci/virtioreg.h>
+#include <dev/pci/virtiovar.h>
+
+#define VIORND_BUFSIZE 32
+
+#define VIORND_DEBUG 1
+
+struct viornd_softc {
+ device_t sc_dev;
+ struct virtio_softc *sc_virtio;
+
+ kmutex_t sc_mutex;
+ bool sc_active;
+
+ void *sc_buf;
+ struct virtqueue sc_vq;
+ bus_dmamap_t sc_dmamap;
+ krndsource_t sc_rndsource;
+};
+
+int viornd_match(device_t, cfdata_t, void *);
+void viornd_attach(device_t, device_t, void *);
+int viornd_vq_done(struct virtqueue *);
+
+CFATTACH_DECL_NEW(viornd, sizeof(struct viornd_softc),
+ viornd_match, viornd_attach, NULL, NULL);
+
+static void
+viornd_get(size_t bytes, void *priv)
+{
+ struct viornd_softc *sc = priv;
+ struct virtio_softc *vsc = sc->sc_virtio;
+ struct virtqueue *vq = &sc->sc_vq;
+ int slot;
+
+ aprint_normal("%s: asked for %d bytes of entropy\n", __func__,
+ VIORND_BUFSIZE);
+ mutex_enter(&sc->sc_mutex);
+
+ if (sc->sc_active) {
+ goto out;
+ }
+
+ bus_dmamap_sync(vsc->sc_dmat, sc->sc_dmamap, 0, VIORND_BUFSIZE,
+ BUS_DMASYNC_PREREAD);
+ if (virtio_enqueue_prep(vsc, vq, &slot)) {
+ virtio_enqueue_abort(vsc, vq, slot);
+ goto out;
+ }
+ if (virtio_enqueue_reserve(vsc, vq, slot, 1)) {
+ goto out;
+ }
+ virtio_enqueue(vsc, vq, slot, sc->sc_dmamap, 0);
+ virtio_enqueue_commit(vsc, vq, slot, 1);
+ sc->sc_active = true;
+out:
+ mutex_exit(&sc->sc_mutex);
+}
+
+int
+viornd_match(device_t parent, cfdata_t match, void *aux)
+{
+ struct virtio_softc *va = aux;
+ if (va->sc_childdevid == PCI_PRODUCT_VIRTIO_ENTROPY)
+ return 1;
+ return 0;
+}
+
+void
+viornd_attach( device_t parent, device_t self, void *aux)
+{
+ struct viornd_softc *sc = device_private(self);
+ struct virtio_softc *vsc = device_private(parent);
+ bus_dma_segment_t segs[1];
+ int nsegs;
+ int error;
+
+ vsc->sc_vqs = &sc->sc_vq;
+ vsc->sc_nvqs = 1;
+ vsc->sc_config_change = 0;
+ if (vsc->sc_child != NULL)
+ panic("already attached to something else");
+ vsc->sc_child = self;
+ vsc->sc_ipl = IPL_NET;
+ vsc->sc_intrhand = virtio_vq_intr;
+ sc->sc_virtio = vsc;
+ sc->sc_dev = self;
+
+ (void)virtio_negotiate_features(vsc, 0);
+
+ mutex_init(&sc->sc_mutex, MUTEX_DEFAULT, IPL_VM);
+
+ error = bus_dmamem_alloc(vsc->sc_dmat,
+ VIRTIO_PAGE_SIZE, 0, 0, segs, 1, &nsegs,
+ BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW);
+ if (error) {
+ aprint_error_dev(sc->sc_dev, "can't alloc dmamem: %d\n",
+ error);
+ goto alloc_failed;
+ }
+
+ error = bus_dmamem_map(vsc->sc_dmat, segs, nsegs, VIORND_BUFSIZE,
+ &sc->sc_buf, BUS_DMA_NOWAIT);
+ if (error) {
+ aprint_error_dev(sc->sc_dev, "can't map dmamem: %d\n", error);
+ goto map_failed;
+ }
+
+ error = bus_dmamap_create(vsc->sc_dmat, VIORND_BUFSIZE, 1,
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