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GNU LESSER GENERAL PUBLIC LICENSE
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Version 2.1, February 1999
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Copyright (C) 1991, 1999 Free Software Foundation, Inc.
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59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Everyone is permitted to copy and distribute verbatim copies
|
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of this license document, but changing it is not allowed.
|
||||||
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||||||
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[This is the first released version of the Lesser GPL. It also counts
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as the successor of the GNU Library Public License, version 2, hence
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the version number 2.1.]
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Preamble
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||||||
|
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||||||
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The licenses for most software are designed to take away your
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freedom to share and change it. By contrast, the GNU General Public
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Licenses are intended to guarantee your freedom to share and change
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free software--to make sure the software is free for all its users.
|
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|
||||||
|
This license, the Lesser General Public License, applies to some
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specially designated software packages--typically libraries--of the
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Free Software Foundation and other authors who decide to use it. You
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|
can use it too, but we suggest you first think carefully about whether
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this license or the ordinary General Public License is the better
|
||||||
|
strategy to use in any particular case, based on the explanations
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below.
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|
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|
When we speak of free software, we are referring to freedom of use,
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not price. Our General Public Licenses are designed to make sure that
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|
you have the freedom to distribute copies of free software (and charge
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for this service if you wish); that you receive source code or can get
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|
it if you want it; that you can change the software and use pieces of
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|
it in new free programs; and that you are informed that you can do
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these things.
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|
To protect your rights, we need to make restrictions that forbid
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distributors to deny you these rights or to ask you to surrender these
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rights. These restrictions translate to certain responsibilities for
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you if you distribute copies of the library or if you modify it.
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For example, if you distribute copies of the library, whether gratis
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or for a fee, you must give the recipients all the rights that we gave
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you. You must make sure that they, too, receive or can get the source
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code. If you link other code with the library, you must provide
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complete object files to the recipients, so that they can relink them
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with the library after making changes to the library and recompiling
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it. And you must show them these terms so they know their rights.
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We protect your rights with a two-step method: (1) we copyright the
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library, and (2) we offer you this license, which gives you legal
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permission to copy, distribute and/or modify the library.
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To protect each distributor, we want to make it very clear that
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there is no warranty for the free library. Also, if the library is
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modified by someone else and passed on, the recipients should know
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author's reputation will not be affected by problems that might be
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introduced by others.
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^L
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Finally, software patents pose a constant threat to the existence of
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any free program. We wish to make sure that a company cannot
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effectively restrict the users of a free program by obtaining a
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consistent with the full freedom of use specified in this license.
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Most GNU software, including some libraries, is covered by the
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General Public License, applies to certain designated libraries, and
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When a program is linked with a library, whether statically or using
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a shared library, the combination of the two is legally speaking a
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combined work, a derivative of the original library. The ordinary
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General Public License therefore permits such linking only if the
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entire combination fits its criteria of freedom. The Lesser General
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Public License permits more lax criteria for linking other code with
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the library.
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We call this license the "Lesser" General Public License because it
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does Less to protect the user's freedom than the ordinary General
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Public License. It also provides other free software developers Less
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of an advantage over competing non-free programs. These disadvantages
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are the reason we use the ordinary General Public License for many
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For example, on rare occasions, there may be a special need to
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library does the same job as widely used non-free libraries. In this
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case, there is little to gain by limiting the free library to free
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software only, so we use the Lesser General Public License.
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In other cases, permission to use a particular library in non-free
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Although the Lesser General Public License is Less protective of the
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users' freedom, it does ensure that the user of a program that is
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linked with the Library has the freedom and the wherewithal to run
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The precise terms and conditions for copying, distribution and
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former contains code derived from the library, whereas the latter must
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be combined with the library in order to run.
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^L
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GNU LESSER GENERAL PUBLIC LICENSE
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TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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0. This License Agreement applies to any software library or other
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Each licensee is addressed as "you".
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The "Library", below, refers to any such software library or work
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(For example, a function in a library to compute square roots has
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a purpose that is entirely well-defined independent of the
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application. Therefore, Subsection 2d requires that any
|
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application-supplied function or table used by this function must
|
||||||
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be optional: if the application does not supply it, the square
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These requirements apply to the modified work as a whole. If
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entire whole, and thus to each and every part regardless of who wrote
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it.
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Thus, it is not the intent of this section to claim rights or contest
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In addition, mere aggregation of another work not based on the Library
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3. You may opt to apply the terms of the ordinary GNU General Public
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that they refer to the ordinary GNU General Public License, version 2,
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instead of to this License. (If a newer version than version 2 of the
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^L
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Once this change is made in a given copy, it is irreversible for
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If distribution of object code is made by offering access to copy
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source code from the same place satisfies the requirement to
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distribute the source code, even though third parties are not
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However, linking a "work that uses the Library" with the Library
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creates an executable that is a derivative of the Library (because it
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library". The executable is therefore covered by this License.
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Section 6 states terms for distribution of such executables.
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When a "work that uses the Library" uses material from a header file
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derivative work of the Library even though the source code is not.
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Whether this is true is especially significant if the work can be
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linked without the Library, or if the work is itself a library. The
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threshold for this to be true is not precisely defined by law.
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If such an object file uses only numerical parameters, data
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structure layouts and accessors, and small macros and small inline
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functions (ten lines or less in length), then the use of the object
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file is unrestricted, regardless of whether it is legally a derivative
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work. (Executables containing this object code plus portions of the
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Otherwise, if the work is a derivative of the Library, you may
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distribute the object code for the work under the terms of Section 6.
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Any executables containing that work also fall under Section 6,
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whether or not they are linked directly with the Library itself.
|
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^L
|
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|
6. As an exception to the Sections above, you may also combine or
|
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link a "work that uses the Library" with the Library to produce a
|
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work containing portions of the Library, and distribute that work
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modification of the work for the customer's own use and reverse
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engineering for debugging such modifications.
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You must give prominent notice with each copy of the work that the
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Library is used in it and that the Library and its use are covered by
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machine-readable source code for the Library including whatever
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with the Library, with the complete machine-readable "work that
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uses the Library", as object code and/or source code, so that the
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|
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|
||||||
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b) Use a suitable shared library mechanism for linking with the
|
||||||
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Library. A suitable mechanism is one that (1) uses at run time a
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copy of the library already present on the user's computer system,
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rather than copying library functions into the executable, and (2)
|
||||||
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will operate properly with a modified version of the library, if
|
||||||
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the user installs one, as long as the modified version is
|
||||||
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interface-compatible with the version that the work was made with.
|
||||||
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|
||||||
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c) Accompany the work with a written offer, valid for at least
|
||||||
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|
||||||
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Subsection 6a, above, for a charge no more than the cost of
|
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|
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|
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||||||
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|
||||||
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e) Verify that the user has already received a copy of these
|
||||||
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materials or that you have already sent this user a copy.
|
||||||
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|
||||||
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For an executable, the required form of the "work that uses the
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||||||
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reproducing the executable from it. However, as a special exception,
|
||||||
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the materials to be distributed need not include anything that is
|
||||||
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normally distributed (in either source or binary form) with the major
|
||||||
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components (compiler, kernel, and so on) of the operating system on
|
||||||
|
which the executable runs, unless that component itself accompanies
|
||||||
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the executable.
|
||||||
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|
||||||
|
It may happen that this requirement contradicts the license
|
||||||
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restrictions of other proprietary libraries that do not normally
|
||||||
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accompany the operating system. Such a contradiction means you cannot
|
||||||
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use both them and the Library together in an executable that you
|
||||||
|
distribute.
|
||||||
|
^L
|
||||||
|
7. You may place library facilities that are a work based on the
|
||||||
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Library side-by-side in a single library together with other library
|
||||||
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facilities not covered by this License, and distribute such a combined
|
||||||
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library, provided that the separate distribution of the work based on
|
||||||
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|
||||||
|
permitted, and provided that you do these two things:
|
||||||
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|
||||||
|
a) Accompany the combined library with a copy of the same work
|
||||||
|
based on the Library, uncombined with any other library
|
||||||
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facilities. This must be distributed under the terms of the
|
||||||
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Sections above.
|
||||||
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|
||||||
|
b) Give prominent notice with the combined library of the fact
|
||||||
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that part of it is a work based on the Library, and explaining
|
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where to find the accompanying uncombined form of the same work.
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|
||||||
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8. You may not copy, modify, sublicense, link with, or distribute
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||||||
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the Library except as expressly provided under this License. Any
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||||||
|
attempt otherwise to copy, modify, sublicense, link with, or
|
||||||
|
distribute the Library is void, and will automatically terminate your
|
||||||
|
rights under this License. However, parties who have received copies,
|
||||||
|
or rights, from you under this License will not have their licenses
|
||||||
|
terminated so long as such parties remain in full compliance.
|
||||||
|
|
||||||
|
9. You are not required to accept this License, since you have not
|
||||||
|
signed it. However, nothing else grants you permission to modify or
|
||||||
|
distribute the Library or its derivative works. These actions are
|
||||||
|
prohibited by law if you do not accept this License. Therefore, by
|
||||||
|
modifying or distributing the Library (or any work based on the
|
||||||
|
Library), you indicate your acceptance of this License to do so, and
|
||||||
|
all its terms and conditions for copying, distributing or modifying
|
||||||
|
the Library or works based on it.
|
||||||
|
|
||||||
|
10. Each time you redistribute the Library (or any work based on the
|
||||||
|
Library), the recipient automatically receives a license from the
|
||||||
|
original licensor to copy, distribute, link with or modify the Library
|
||||||
|
subject to these terms and conditions. You may not impose any further
|
||||||
|
restrictions on the recipients' exercise of the rights granted herein.
|
||||||
|
You are not responsible for enforcing compliance by third parties with
|
||||||
|
this License.
|
||||||
|
^L
|
||||||
|
11. If, as a consequence of a court judgment or allegation of patent
|
||||||
|
infringement or for any other reason (not limited to patent issues),
|
||||||
|
conditions are imposed on you (whether by court order, agreement or
|
||||||
|
otherwise) that contradict the conditions of this License, they do not
|
||||||
|
excuse you from the conditions of this License. If you cannot
|
||||||
|
distribute so as to satisfy simultaneously your obligations under this
|
||||||
|
License and any other pertinent obligations, then as a consequence you
|
||||||
|
may not distribute the Library at all. For example, if a patent
|
||||||
|
license would not permit royalty-free redistribution of the Library by
|
||||||
|
all those who receive copies directly or indirectly through you, then
|
||||||
|
the only way you could satisfy both it and this License would be to
|
||||||
|
refrain entirely from distribution of the Library.
|
||||||
|
|
||||||
|
If any portion of this section is held invalid or unenforceable under
|
||||||
|
any particular circumstance, the balance of the section is intended to
|
||||||
|
apply, and the section as a whole is intended to apply in other
|
||||||
|
circumstances.
|
||||||
|
|
||||||
|
It is not the purpose of this section to induce you to infringe any
|
||||||
|
patents or other property right claims or to contest validity of any
|
||||||
|
such claims; this section has the sole purpose of protecting the
|
||||||
|
integrity of the free software distribution system which is
|
||||||
|
implemented by public license practices. Many people have made
|
||||||
|
generous contributions to the wide range of software distributed
|
||||||
|
through that system in reliance on consistent application of that
|
||||||
|
system; it is up to the author/donor to decide if he or she is willing
|
||||||
|
to distribute software through any other system and a licensee cannot
|
||||||
|
impose that choice.
|
||||||
|
|
||||||
|
This section is intended to make thoroughly clear what is believed to
|
||||||
|
be a consequence of the rest of this License.
|
||||||
|
|
||||||
|
12. If the distribution and/or use of the Library is restricted in
|
||||||
|
certain countries either by patents or by copyrighted interfaces, the
|
||||||
|
original copyright holder who places the Library under this License
|
||||||
|
may add an explicit geographical distribution limitation excluding those
|
||||||
|
countries, so that distribution is permitted only in or among
|
||||||
|
countries not thus excluded. In such case, this License incorporates
|
||||||
|
the limitation as if written in the body of this License.
|
||||||
|
|
||||||
|
13. The Free Software Foundation may publish revised and/or new
|
||||||
|
versions of the Lesser General Public License from time to time.
|
||||||
|
Such new versions will be similar in spirit to the present version,
|
||||||
|
but may differ in detail to address new problems or concerns.
|
||||||
|
|
||||||
|
Each version is given a distinguishing version number. If the Library
|
||||||
|
specifies a version number of this License which applies to it and
|
||||||
|
"any later version", you have the option of following the terms and
|
||||||
|
conditions either of that version or of any later version published by
|
||||||
|
the Free Software Foundation. If the Library does not specify a
|
||||||
|
license version number, you may choose any version ever published by
|
||||||
|
the Free Software Foundation.
|
||||||
|
^L
|
||||||
|
14. If you wish to incorporate parts of the Library into other free
|
||||||
|
programs whose distribution conditions are incompatible with these,
|
||||||
|
write to the author to ask for permission. For software which is
|
||||||
|
copyrighted by the Free Software Foundation, write to the Free
|
||||||
|
Software Foundation; we sometimes make exceptions for this. Our
|
||||||
|
decision will be guided by the two goals of preserving the free status
|
||||||
|
of all derivatives of our free software and of promoting the sharing
|
||||||
|
and reuse of software generally.
|
||||||
|
|
||||||
|
NO WARRANTY
|
||||||
|
|
||||||
|
15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
|
||||||
|
WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
|
||||||
|
EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
|
||||||
|
OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
|
||||||
|
KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
|
||||||
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||||||
|
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
|
||||||
|
LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
|
||||||
|
THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
|
||||||
|
|
||||||
|
16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
|
||||||
|
WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
|
||||||
|
AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
|
||||||
|
FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
|
||||||
|
CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
|
||||||
|
LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
|
||||||
|
RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
|
||||||
|
FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
|
||||||
|
SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
|
||||||
|
DAMAGES.
|
||||||
|
|
||||||
|
END OF TERMS AND CONDITIONS
|
||||||
|
^L
|
||||||
|
How to Apply These Terms to Your New Libraries
|
||||||
|
|
||||||
|
If you develop a new library, and you want it to be of the greatest
|
||||||
|
possible use to the public, we recommend making it free software that
|
||||||
|
everyone can redistribute and change. You can do so by permitting
|
||||||
|
redistribution under these terms (or, alternatively, under the terms
|
||||||
|
of the ordinary General Public License).
|
||||||
|
|
||||||
|
To apply these terms, attach the following notices to the library.
|
||||||
|
It is safest to attach them to the start of each source file to most
|
||||||
|
effectively convey the exclusion of warranty; and each file should
|
||||||
|
have at least the "copyright" line and a pointer to where the full
|
||||||
|
notice is found.
|
||||||
|
|
||||||
|
|
||||||
|
<one line to give the library's name and a brief idea of what it does.>
|
||||||
|
Copyright (C) <year> <name of author>
|
||||||
|
|
||||||
|
This library is free software; you can redistribute it and/or
|
||||||
|
modify it under the terms of the GNU Lesser General Public
|
||||||
|
License as published by the Free Software Foundation; either
|
||||||
|
version 2.1 of the License, or (at your option) any later version.
|
||||||
|
|
||||||
|
This library is distributed in the hope that it will be useful,
|
||||||
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||||
|
Lesser General Public License for more details.
|
||||||
|
|
||||||
|
You should have received a copy of the GNU Lesser General Public
|
||||||
|
License along with this library; if not, write to the Free Software
|
||||||
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||||||
|
|
||||||
|
Also add information on how to contact you by electronic and paper mail.
|
||||||
|
|
||||||
|
You should also get your employer (if you work as a programmer) or
|
||||||
|
your school, if any, to sign a "copyright disclaimer" for the library,
|
||||||
|
if necessary. Here is a sample; alter the names:
|
||||||
|
|
||||||
|
Yoyodyne, Inc., hereby disclaims all copyright interest in the
|
||||||
|
library `Frob' (a library for tweaking knobs) written by James
|
||||||
|
Random Hacker.
|
||||||
|
|
||||||
|
<signature of Ty Coon>, 1 April 1990
|
||||||
|
Ty Coon, President of Vice
|
||||||
|
|
||||||
|
That's all there is to it!
|
||||||
|
|
||||||
|
|
||||||
4
ChangeLog
Normal file
4
ChangeLog
Normal file
@ -0,0 +1,4 @@
|
|||||||
|
Wed Nov 2 13:44:47 CET 2005 Daniel Veillard <veillard@redhat.com>
|
||||||
|
|
||||||
|
* src/libxen.c src/Makefile.am include/libxen.h configure.in
|
||||||
|
Makefile.am COPYING.LIB: creation
|
||||||
9
Makefile.am
Normal file
9
Makefile.am
Normal file
@ -0,0 +1,9 @@
|
|||||||
|
## Process this file with automake to produce Makefile.in
|
||||||
|
|
||||||
|
SUBDIRS = src #docs
|
||||||
|
EXTRA_DIST = libxen.spec.in libxen.spec COPYING.LIB \
|
||||||
|
libxen.pc.in libxen.pc
|
||||||
|
|
||||||
|
pkgconfigdir = $(libdir)/pkgconfig
|
||||||
|
pkgconfig_DATA = libxen.pc
|
||||||
|
|
||||||
35
configure.in
Normal file
35
configure.in
Normal file
@ -0,0 +1,35 @@
|
|||||||
|
dnl Process this file with autoconf to produce a configure script.
|
||||||
|
AC_INIT(entities.c)
|
||||||
|
AM_CONFIG_HEADER(config.h)
|
||||||
|
AC_CANONICAL_HOST
|
||||||
|
|
||||||
|
LIBXEN_MAJOR_VERSION=0
|
||||||
|
LIBXEN_MINOR_VERSION=0
|
||||||
|
LIBXEN_MICRO_VERSION=1
|
||||||
|
LIBXEN_MICRO_VERSION_SUFFIX=
|
||||||
|
LIBXEN_VERSION=$LIBXEN_MAJOR_VERSION.$LIBXEN_MINOR_VERSION.$LIBXEN_MICRO_VERSION$LIBXEN_MICRO_VERSION_SUFFIX
|
||||||
|
LIBXEN_VERSION_INFO=`expr $LIBXEN_MAJOR_VERSION + $LIBXEN_MINOR_VERSION`:$LIBXEN_MICRO_VERSION:$LIBXEN_MINOR_VERSION
|
||||||
|
|
||||||
|
LIBXEN_VERSION_NUMBER=`expr $LIBXEN_MAJOR_VERSION \* 10000 + $LIBXEN_MINOR_VERSION \* 100 + $LIBXEN_MICRO_VERSION`
|
||||||
|
|
||||||
|
if test -f CVS/Entries; then
|
||||||
|
extra=`grep ChangeLog CVS/Entries | grep -v LIBXEN | sed -e s\%/ChangeLog/1\.%% -e s\%/.*$%%`
|
||||||
|
echo extra=$extra
|
||||||
|
if test "$extra" != ""
|
||||||
|
then
|
||||||
|
LIBXEN_VERSION_EXTRA="-CVS$extra"
|
||||||
|
fi
|
||||||
|
fi
|
||||||
|
|
||||||
|
AC_SUBST(LIBXEN_MAJOR_VERSION)
|
||||||
|
AC_SUBST(LIBXEN_MINOR_VERSION)
|
||||||
|
AC_SUBST(LIBXEN_MICRO_VERSION)
|
||||||
|
AC_SUBST(LIBXEN_VERSION)
|
||||||
|
AC_SUBST(LIBXEN_VERSION_INFO)
|
||||||
|
AC_SUBST(LIBXEN_VERSION_NUMBER)
|
||||||
|
AC_SUBST(LIBXEN_VERSION_EXTRA)
|
||||||
|
|
||||||
|
VERSION=${LIBXEN_VERSION}
|
||||||
|
|
||||||
|
AM_INIT_AUTOMAKE(libxen, $VERSION)
|
||||||
|
|
||||||
4
docs/Plan
Normal file
4
docs/Plan
Normal file
@ -0,0 +1,4 @@
|
|||||||
|
1/ go for a minimal library first, expand on use cases
|
||||||
|
2/ reuse xenctrl.h / libxenctrl in a first implementation, but make
|
||||||
|
sure to clearly isolate the bits calling them
|
||||||
|
3/
|
||||||
33
docs/analysis
Normal file
33
docs/analysis
Normal file
@ -0,0 +1,33 @@
|
|||||||
|
arch/xen/kernel/evtchn.c: Communication via Xen event channels
|
||||||
|
->HYPERVISOR_xen_version call
|
||||||
|
->HYPERVISOR_physdev_op call
|
||||||
|
->HYPERVISOR_event_channel_op call
|
||||||
|
-> global HYPERVISOR_shared_info
|
||||||
|
|
||||||
|
arch/xen/kernel/fixup.c: binary rewrinting for threads TLS
|
||||||
|
-> message to suppress... + boot delay
|
||||||
|
|
||||||
|
arch/xen/kernel/gnttab.c: memory access and sharing
|
||||||
|
inline assemby from privcmd.c using TRAP_INSTR macro to do an hypervisor
|
||||||
|
call apparently.
|
||||||
|
|
||||||
|
arch/xen/kernel/reboot.c:
|
||||||
|
-> HYPERVISOR_suspend call
|
||||||
|
|
||||||
|
include/asm-xen/asm-i386/hypercall.h:
|
||||||
|
-> assembly macro for the hypervisor calls
|
||||||
|
|
||||||
|
tools/libxc/xc_*.c: library for xen control
|
||||||
|
|
||||||
|
tools/libxc/xc_private.h:
|
||||||
|
-> Xen hypervisor call is an ioctl() with an privcmd_hypercall_t parameter
|
||||||
|
xc_domain.c:
|
||||||
|
-> API for all domain supervisor calls, create, memory, cpu weight, destroy
|
||||||
|
|
||||||
|
=> Fraser all over the place ...
|
||||||
|
|
||||||
|
/Xen/xen-unstable.hg/tools/libxc
|
||||||
|
|
||||||
|
|
||||||
|
The hypervisor calls are defined as inlined functions in xc_private.h
|
||||||
|
This is GPL and not installed.
|
||||||
101
docs/library.xen
Normal file
101
docs/library.xen
Normal file
@ -0,0 +1,101 @@
|
|||||||
|
|
||||||
|
About a libxen library
|
||||||
|
======================
|
||||||
|
|
||||||
|
Functional description:
|
||||||
|
-----------------------
|
||||||
|
|
||||||
|
Small C library to be able to control Xen Linux guest, i.e.
|
||||||
|
provide the following operations for Xen guest domains running Linux
|
||||||
|
from domain 0 code linked to the library (running as root):
|
||||||
|
- start
|
||||||
|
- stop
|
||||||
|
- suspend
|
||||||
|
- resume
|
||||||
|
- monitor
|
||||||
|
More advanced features should be allowed as future extensions, but
|
||||||
|
are not expected to be provided in first shipment.
|
||||||
|
|
||||||
|
Open enough Licence that customers can link their apps to it (LGPL)
|
||||||
|
|
||||||
|
Small and contained enough that we can use it as a way to
|
||||||
|
provide API and ABI stability in spite if the evolution of Xen
|
||||||
|
existing API and hypervisor calls.
|
||||||
|
|
||||||
|
The current state of Xen userland:
|
||||||
|
----------------------------------
|
||||||
|
|
||||||
|
the existing Xen 3.0 userland code is mostly based on tiny C functions
|
||||||
|
using direct hypervisor calls (or /proc/xen/ interfaces) and a lot of
|
||||||
|
Python code on top driving the hypervisor.
|
||||||
|
The C code is relatively hairy, functions with 10 parameters or more
|
||||||
|
are not uncommon, and it is very low level usually without comment about
|
||||||
|
the function or its arguments. They are usually only called once in the
|
||||||
|
whole tree by the python bindings. In essence it looks like the Xen project
|
||||||
|
was not implemented with the idea of reusing that part of the code by
|
||||||
|
applications.
|
||||||
|
Indeed most of the userland code coming with Xen is built on Python,
|
||||||
|
like xend the xen daemon running on domain 0 or the xenstored daemon which
|
||||||
|
manage the state of the domains launched.
|
||||||
|
|
||||||
|
Rebuilding a library ?:
|
||||||
|
-----------------------
|
||||||
|
|
||||||
|
Providing a library at the C level to drive domain execution is in a
|
||||||
|
very large part a rimplementation of existing code but in a different way
|
||||||
|
and somehow with different goals for the code. The existing Licence (GPL)
|
||||||
|
makes it uneasy, we can't copy GPL code to put it in a LGPL'ed library,
|
||||||
|
and rewriting everything while looking at the Xen code will inevitably
|
||||||
|
lead to code similarities especially with this kind of system code. Plus
|
||||||
|
we will still need to run xend and probably xenstored to not diverge
|
||||||
|
completely from Xen existing code base.
|
||||||
|
|
||||||
|
The IBM way:
|
||||||
|
------------
|
||||||
|
|
||||||
|
Here is supposition about code that I can't instanciate except by looking
|
||||||
|
at said code but it looks that IBM also needed a C programmatic API to
|
||||||
|
manage the Xen domain definitions. Their solution was to build (Rusty
|
||||||
|
Russell did this) an LGPL C API connecting directly to the xenstore
|
||||||
|
daemon (./tools/xenstore/*). In a way this is quite more fragile as it depends
|
||||||
|
on the whole existing stack of the Xen code, but it isolate the API
|
||||||
|
from the implementation details of the current Xen source (API in
|
||||||
|
./tools/xenstore/xs.h). The goal seems to be more about testing and controlling
|
||||||
|
the xen store daemon, but it shows a different approach to decouple client
|
||||||
|
API/ABI from the Xen existing code.
|
||||||
|
|
||||||
|
Open question:
|
||||||
|
---------------
|
||||||
|
|
||||||
|
To what extent should libxen be a rewrite or an isolation layer around
|
||||||
|
some of the existing code ?
|
||||||
|
|
||||||
|
Rewrite:
|
||||||
|
|
||||||
|
Pros:
|
||||||
|
- avoid the GPL Licence problem potentially more users
|
||||||
|
- allow do build a cleaner more stable layer
|
||||||
|
- the existing code is frigthening
|
||||||
|
Cons:
|
||||||
|
- awful lot of work debugging very hard
|
||||||
|
- will still require existing Xen code to be running
|
||||||
|
- splitting interfaces is hard politically and lower the
|
||||||
|
Open Source efforts toward the project
|
||||||
|
|
||||||
|
Wrappers on top of existing code:
|
||||||
|
|
||||||
|
Pros:
|
||||||
|
- much smaller code rewrite
|
||||||
|
- benefits from the bugfixes injected by other patchers upstream
|
||||||
|
Cons:
|
||||||
|
- Licence constraint GPL only for apps
|
||||||
|
- API/ABI isolation may not be easier in that way
|
||||||
|
|
||||||
|
Potentially the API could be implemented as a layer on top of the existing
|
||||||
|
libxc C code library and then progressively migrating out the existing
|
||||||
|
dependance to Xen code as the interfaces stabilize.
|
||||||
|
|
||||||
|
Daniel Veillard <veillard@redhat.com>
|
||||||
|
|
||||||
|
Mon Oct 24 18:40:19 CEST 2005
|
||||||
|
|
||||||
80
include/libxen.h
Normal file
80
include/libxen.h
Normal file
@ -0,0 +1,80 @@
|
|||||||
|
/*
|
||||||
|
* libxen.h: interface for the libxen library to handle Xen domains
|
||||||
|
* from a process running in domain 0
|
||||||
|
*
|
||||||
|
* Copyright (C) 2005 Red Hat, Inc.
|
||||||
|
*
|
||||||
|
* See COPYING.LIB for the License of this software
|
||||||
|
*
|
||||||
|
* Daniel Veillard <veillard@redhat.com>
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef __XEN_XENLIB_H__
|
||||||
|
#define __XEN_XENLIB_H__
|
||||||
|
|
||||||
|
#ifdef __cplusplus
|
||||||
|
extern "C" {
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/**
|
||||||
|
* xenConnect:
|
||||||
|
*
|
||||||
|
* a xenConnect is a private structure representing a connection to
|
||||||
|
* the Xen Hypervisor.
|
||||||
|
*/
|
||||||
|
typedef struct _xenConnect xenConnect;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* xenConnectPtr:
|
||||||
|
*
|
||||||
|
* a xenConnectPtr is pointer to a xenConnect private structure, this is the
|
||||||
|
* type used to reference a connection to the Xen Hypervisor in the API.
|
||||||
|
*/
|
||||||
|
typedef xenConnect *xenConnectPtr;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* xenDomain:
|
||||||
|
*
|
||||||
|
* a xenDomain is a private structure representing a Xen domain.
|
||||||
|
*/
|
||||||
|
typedef struct _xenDomain xenDomain;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* xenDomainPtr:
|
||||||
|
*
|
||||||
|
* a xenDomainPtr is pointer to a xenDomain private structure, this is the
|
||||||
|
* type used to reference a Xen domain in the API.
|
||||||
|
*/
|
||||||
|
typedef xenDomain *xenDomainPtr;
|
||||||
|
|
||||||
|
|
||||||
|
/**
|
||||||
|
* xenDomainFlags:
|
||||||
|
*
|
||||||
|
* Flags OR'ed together to provide specific behaviour when creating a
|
||||||
|
* Domain.
|
||||||
|
*/
|
||||||
|
typedef enum {
|
||||||
|
XEN_DOMAIN_NONE = 0
|
||||||
|
} xenDomainFlags;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Connection and disconnections to the Hypervisor
|
||||||
|
*/
|
||||||
|
xenConnectPtr xenOpenConnect (const char *name);
|
||||||
|
int xenCloseConnect (xenConnectPtr conn);
|
||||||
|
unsigned long xenGetVersion (xenConnectPtr conn);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Domain creation and destruction
|
||||||
|
*/
|
||||||
|
xenDomainPtr xenCreateLinuxDomain (xenConnectPtr conn,
|
||||||
|
const char *kernel_path,
|
||||||
|
const char *initrd_path,
|
||||||
|
const char *cmdline,
|
||||||
|
unsigned int flags);
|
||||||
|
#ifdef __cplusplus
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#endif /* __XEN_XENLIB_H__ */
|
||||||
8
src/Makefile.am
Normal file
8
src/Makefile.am
Normal file
@ -0,0 +1,8 @@
|
|||||||
|
## Process this file with automake to produce Makefile.in
|
||||||
|
|
||||||
|
INCLUDES = -I$(top_builddir)/include -I@srcdir@/include
|
||||||
|
|
||||||
|
lib_LTLIBRARIES = libxen.la
|
||||||
|
libxen_la_LIBADD =
|
||||||
|
libxen_la_LDFLAGS = -version-info @LIBXML_VERSION_INFO@
|
||||||
|
libxen_la_SOURCES = libxen.c
|
||||||
76
src/libxen.c
Normal file
76
src/libxen.c
Normal file
@ -0,0 +1,76 @@
|
|||||||
|
/*
|
||||||
|
* libxen.h: Main interfaces for the libxen library to handle virtualization
|
||||||
|
* domains from a process running in domain 0
|
||||||
|
*
|
||||||
|
* Copyright (C) 2005 Red Hat, Inc.
|
||||||
|
*
|
||||||
|
* See COPYING.LIB for the License of this software
|
||||||
|
*
|
||||||
|
* Daniel Veillard <veillard@redhat.com>
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include "libxen.h"
|
||||||
|
|
||||||
|
#include "memory.h"
|
||||||
|
#include "internal.h"
|
||||||
|
|
||||||
|
/*
|
||||||
|
* TODO:
|
||||||
|
* - use lock to protect against concurrent accesses ?
|
||||||
|
* - use reference counting to garantee coherent pointer state ?
|
||||||
|
*/
|
||||||
|
|
||||||
|
#define XEN_CONNECT_MAGIC 0x4F23DEAD
|
||||||
|
/**
|
||||||
|
* _xenConnect:
|
||||||
|
*
|
||||||
|
* Internal structure associated to a connection
|
||||||
|
*/
|
||||||
|
struct _xenConnect {
|
||||||
|
unsigned int magic; /* specific value to check */
|
||||||
|
int handle; /* internal handle used for hypercall */
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* xenGetConnect:
|
||||||
|
* @name: optional argument currently unused, pass NULL
|
||||||
|
*
|
||||||
|
* This function should be called first to get a connection to the
|
||||||
|
* Hypervisor
|
||||||
|
*
|
||||||
|
* Returns a pointer to the hypervisor connection or NULL in case of error
|
||||||
|
*/
|
||||||
|
xenConnectPtr
|
||||||
|
xenOpenConnect(const char *name ATTRIBUTE_UNUSED) {
|
||||||
|
return(NULL);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* xenCloseConnect:
|
||||||
|
* @conn: pointer to the hypervisor connection
|
||||||
|
*
|
||||||
|
* This function closes the connection to the Hypervisor. This should
|
||||||
|
* not be called if further interaction with the Hypervisor are needed
|
||||||
|
* especially if there is running domain which need further monitoring by
|
||||||
|
* the application.
|
||||||
|
*
|
||||||
|
* Returns 0 in case of success or -1 in case of error.
|
||||||
|
*/
|
||||||
|
int
|
||||||
|
xenCloseConnect(xenConnectPtr conn) {
|
||||||
|
if ((conn == NULL) || (conn->magic != XEN_CONNECT_MAGIC))
|
||||||
|
return(-1);
|
||||||
|
/*
|
||||||
|
* TODO:
|
||||||
|
* Free the domain pointers associated to this connection
|
||||||
|
*/
|
||||||
|
conn->magic = -1;
|
||||||
|
free(conn);
|
||||||
|
return(0);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* xenGetVersion:
|
||||||
|
* @conn: pointer to the hypervisor connection
|
||||||
|
*
|
||||||
|
* Get the version level of the Hypervisor running
|
||||||
Loading…
x
Reference in New Issue
Block a user