65 lines
2.5 KiB
Groff
65 lines
2.5 KiB
Groff
.\" $NetBSD: rumpuser.3,v 1.2 2010/03/01 17:20:44 pooka Exp $
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.\"
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.\" Copyright (c) 2010 Antti Kantee. All rights reserved.
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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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd March 1, 2010
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.Dt RUMPUSER 3
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.Os
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.Sh NAME
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.Nm rumpuser
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.Nd rump hypervisor interface
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.Sh LIBRARY
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rump User Library (librumpuser, \-lrumpuser)
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.Sh SYNOPSIS
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.In rump/rumpuser.h
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.Sh DESCRIPTION
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.Nm
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is the hypervisor interface for
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.Xr rump 3
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style kernel virtualization.
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A virtual rump kernel can make calls to the host operating system
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libraries and kernel (system calls) using
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.Nm
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interfaces.
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Any "slow" hypervisor calls such as file I/O, sychronization wait,
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or sleep will cause rump to unschedule the calling kernel thread
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from the virtual CPU and free it for other consumers.
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When the hypervisor call returns to the kernel, a new scheduling
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operation takes place.
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.Pp
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For example, rump implements kernel threads directly as hypervisor
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calls to host
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.Xr pthread 3 .
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This avoids the common virtualization drawback of multiple overlapping
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and possibly conflicting implementations of same functionality in
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the software stack.
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.Pp
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The
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.Nm
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interface is still under development and interface documentation
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is available only in source form from
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.Pa src/lib/librumpuser .
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.Sh SEE ALSO
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.Xr rump 3
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