65 lines
2.3 KiB
Groff
65 lines
2.3 KiB
Groff
.\" $NetBSD: viornd.4,v 1.3 2020/11/04 15:24:56 kim Exp $
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.\"
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.\" Copyright (c) 2014 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Thor Lancelot Simon.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd October 26, 2014
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.Dt VIORND 4
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.Os
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.Sh NAME
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.Nm viornd
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.Nd VirtIO entropy source
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.Sh SYNOPSIS
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.Cd "viornd* at virtio?"
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.Sh DESCRIPTION
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When the system has entropy demand,
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the
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.Nm
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driver, used with a compatible hypervisor such as QEMU, KVM, or Google
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Compute Engine, requests entropy using the VirtIO random number interface
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and feeds it into the system entropy pool.
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.Sh SEE ALSO
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.Xr rnd 4 ,
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.Xr virtio 4
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.Sh HISTORY
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The
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.Nm
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driver appeared in
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.Ox 5.5 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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driver was written by
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.An Stephan Fritsch Aq Mt sf@fritsch.de
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and reworked to request entropy upon demand by
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.An Thor Lancelot Simon Aq Mt tls@NetBSD.org .
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.Sh CAVEATS
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VirtIO appears to support at least 8 pending entropy requests, but
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.Nm
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currently supports only one pending request at a time.
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