List of maintainers and how to submit changes
=============================================
Please try to follow the guidelines below. This will make things
easier on the maintainers. Not all of these guidelines matter for every
trivial patch so apply some common sense.
1. Always _test_ your changes, however small, on at least 4 or
5 people, preferably many more.
2. Make sure your changes compile correctly in multiple
configurations. For example, both 32- and 64-bit x86.
3. Make a patch available to the relevant maintainer in the list. Use
'diff -u' to make the patch easy to merge. Be prepared to get your
changes sent back with seemingly silly requests about formatting
and variable names. These aren't as silly as they seem. One
job the maintainers do is to keep things looking the same.
PLEASE see https://wiki.xenproject.org/wiki/Submitting_Xen_Patches for
hints on how to submit a patch to xen-unstable in a suitable
form.
PLEASE try to include any credit lines you want added with the
patch. It avoids people being missed off by mistake and makes
it easier to know who wants adding and who doesn't.
PLEASE document known bugs. If it doesn't work for everything
or does something very odd once a month document it.
PLEASE remember that submissions must be made under the terms
of the "Developer's Certificate of Origin" (DCO) and should include
a Signed-off-by: line.
4. Make sure you have the right to send any changes you make. If you
do changes at work you may find your employer owns the patch
not you.
5. Happy hacking.
Stable Release Maintenance
==========================
The policy for inclusion in a Xen stable release is different to that
for inclusion in xen-unstable.
Please see https://wiki.xenproject.org/wiki/Xen_Maintenance_Releases for more
information.
Backport requests should be made on the xen-devel@lists.xenproject.org
list. Remember to copy the appropriate stable branch maintainer who
will be listed in this section of the MAINTAINERS file in the
appropriate branch.
Unstable Subsystem Maintainers
==============================
Descriptions of section entries:
M: Maintainer: FullName <address@domain>
Maintainers should be CCed on patches. At least one of them
needs to approve changes to the covered files.
R: Designated reviewer: FullName <address@domain>
Reviewers should be CCed on patches. However, they do not
have a formal governance role, and are listed here
simply because of their own request.
L: Mailing list that is relevant to this area
W: Web-page with status/info
T: SCM tree type and location. Type is one of: git, hg, quilt, stgit.
S: Status, one of the following:
Supported: Someone is actually paid to look after this.
Maintained: Someone actually looks after it.
Odd Fixes: It has a maintainer but they don't have time to do
much other than throw the odd patch in. See below..
Orphan: No current maintainer [but maybe you could take the
role as you write your new code].
Obsolete: Old code. Something tagged obsolete generally means
it has been replaced by a better system and you
should be using that.
F: Files and directories with wildcard patterns.
A trailing slash includes all files and subdirectory files.
F: drivers/net/ all files in and below drivers/net
F: drivers/net/* all files in drivers/net, but not below
F: */net/* all files in "any top level directory"/net
One pattern per line. Multiple F: lines acceptable.
X: Files and directories that are NOT maintained, same rules as F:
Files exclusions are tested before file matches.
Can be useful for excluding a specific subdirectory, for instance:
F: net/
X: net/ipv6/
matches all files in and below net excluding net/ipv6/
K: Keyword perl extended regex pattern to match content in a
patch or file. For instance:
K: of_get_profile
matches patches or files that contain "of_get_profile"
K: \b(printk|pr_(info|err))\b
matches patches or files that contain one or more of the words
printk, pr_info or pr_err
One regex pattern per line. Multiple K: lines acceptable.
V: Version identifier that must be under THE REST and follows
the format:
xen-maintainers-<version format number of this file>
Check-in policy
===============
In order for a patch to be checked in, in general, several conditions
must be met:
1. In order to get a change to a given file committed, it must have
the approval of at least one maintainer of that file.
A patch of course needs Acks from the maintainers of each file that
it changes; so a patch which changes xen/arch/x86/traps.c,
xen/arch/x86/mm/p2m.c, and xen/arch/x86/mm/shadow/multi.c would
require an Ack from each of the three sets of maintainers.
See below for rules on nested maintainership.
2. It must have appropriate approval from someone other than the
submitter. This can be either:
a. An Acked-by from a maintainer of the code being touched (a
co-maintainer if available, or a more general level maintainer if
not available; see the secton on nested maintainership)
b. A Reviewed-by by anyone of suitable stature in the community
3. Sufficient time must have been given for anyone to respond. This
depends in large part upon the urgency and nature of the patch.
For a straightforward uncontroversial patch, a day or two may be
sufficient; for a controversial patch, a week or two may be better.
4. There must be no "open" objections.
In a case where one person submits a patch and a maintainer gives an
Ack, the Ack stands in for both the approval requirement (#1) and the
Acked-by-non-submitter requirement (#2).
In a case where a maintainer themselves submits a patch, the
Signed-off-by meets the approval requirement (#1); so a Review
from anyone in the community suffices for requirement #2.
Before a maintainer checks in their own patch with another community
member's R-b but no co-maintainer Ack, it is especially important to
give their co-maintainer opportunity to give feedback, perhaps
declaring their intention to check it in without their co-maintainers
ack a day before doing so.
Maintainers may choose to override non-maintainer objections in the
case that consensus can't be reached.
As always, no policy can cover all possible situations. In
exceptional circumstances, committers may commit a patch in absence of
one or more of the above requirements, if they are reasonably
confident that the other maintainers will approve of their decision in
retrospect.
The meaning of nesting
======================
Many maintainership areas are "nested": for example, there are entries
for xen/arch/x86 as well as xen/arch/x86/mm, and even
xen/arch/x86/mm/shadow; and there is a section at the end called "THE
REST" which lists all committers. The meaning of nesting is that:
1. Under normal circumstances, the Ack of the most specific maintainer
is both necessary and sufficient to get a change to a given file
committed. So a change to xen/arch/x86/mm/shadow/multi.c requires the
the Ack of the xen/arch/x86/mm/shadow maintainer for that part of the
patch, but would not require the Ack of the xen/arch/x86 maintainer or
the xen/arch/x86/mm maintainer.
2. In unusual circumstances, a more general maintainer's Ack can stand
in for or even overrule a specific maintainer's Ack. Unusual
circumstances might include:
- The patch is fixing a high-priority issue causing immediate pain,
and the more specific maintainer is not available.
- The more specific maintainer has not responded either to the
original patch, nor to "pings", within a reasonable amount of time.
- The more general maintainer wants to overrule the more specific
maintainer on some issue. (This should be exceptional.)
- In the case of a disagreement between maintainers, THE REST can
settle the matter by majority vote. (This should be very exceptional
indeed.)
Maintainers List (try to look for most precise areas first)
-----------------------------------
ACPI
M: Jan Beulich <jbeulich@suse.com>
S: Supported
F: xen/arch/x86/acpi/
F: xen/drivers/acpi/
F: xen/include/acpi/
F: tools/libacpi/
AMD IOMMU
M: Jan Beulich <jbeulich@suse.com>
M: Andrew Cooper <andrew.cooper3@citrix.com>
S: Maintained
F: xen/drivers/passthrough/amd/
AMD SVM
M: Jan Beulich <jbeulich@suse.com>
M: Andrew Cooper <andrew.cooper3@citrix.com>
S: Supported
F: xen/arch/x86/hvm/svm/
F: xen/arch/x86/cpu/vpmu_amd.c
ARGO
M: Christopher Clark <christopher.w.clark@gmail.com>
S: Maintained
F: xen/include/public/argo.h
F: xen/include/xen/argo.h
F: xen/common/argo.c
ARINC653 SCHEDULER
M: Josh Whitehead <josh.whitehead@dornerworks.com>
M: Stewart Hildebrand <stewart.hildebrand@dornerworks.com>
S: Supported
L: xen-devel@dornerworks.com
F: xen/common/sched/arinc653.c
F: tools/libxc/xc_arinc653.c
ARM (W/ VIRTUALISATION EXTENSIONS) ARCHITECTURE
M: Stefano Stabellini <sstabellini@kernel.org>
M: Julien Grall <julien@xen.org>
R: Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>
S: Supported
L: xen-devel@lists.xenproject.org
F: docs/misc/arm/
F: xen/arch/arm/
F: xen/drivers/char/arm-uart.c
F: xen/drivers/char/cadence-uart.c
F: xen/drivers/char/exynos4210-uart.c
F: xen/drivers/char/meson-uart.c
F: xen/drivers/char/mvebu-uart.c
F: xen/drivers/char/omap-uart.c
F: xen/drivers/char/pl011.c
F: xen/drivers/char/scif-uart.c
F: xen/drivers/passthrough/arm/
F: xen/include/asm-arm/
F: xen/include/public/arch-arm/
F: xen/include/public/arch-arm.h
Change Log
M: Paul Durrant <paul@xen.org>
R: Community Manager <community.manager@xenproject.org>
S: Maintained
F: CHANGELOG.md
Continuous Integration (CI)
M: Doug Goldstein <cardoe@cardoe.com>
W: https://gitlab.com/xen-project/xen
W: https://travis-ci.org/xen-project/xen
S: Supported
F: .gitlab-ci.yml
F: .travis.yml
F: automation/
F: scripts/travis-build
CPU POOLS
M: Juergen Gross <jgross@suse.com>
M: Dario Faggioli <dfaggioli@suse.com>
S: Supported
F: xen/common/sched/cpupool.c
DEVICE TREE
M: Stefano Stabellini <sstabellini@kernel.org>
M: Julien Grall <julien@xen.org>
S: Supported
F: xen/common/libfdt/
F: xen/common/device_tree.c
F: xen/include/xen/libfdt/
F: xen/include/xen/device_tree.h
F: xen/drivers/passthrough/device_tree.c
EFI
M: Jan Beulich <jbeulich@suse.com>
S: Supported
F: xen/arch/x86/efi/
F: xen/common/efi/
F: xen/include/efi/
F: xen/include/asm-x86/efi*.h
F: xen/include/asm-x86/x86_*/efi*.h
GDBSX DEBUGGER
M: Elena Ufimtseva <elena.ufimtseva@oracle.com>
S: Supported
F: xen/arch/x86/debug.c
F: tools/debugger/gdbsx/
GOLANG BINDINGS
M: George Dunlap <george.dunlap@citrix.com>
S: Maintained
F: tools/golang
INTEL(R) TRUSTED EXECUTION TECHNOLOGY (TXT)
R: Lukasz Hawrylko <lukasz.hawrylko@linux.intel.com>
S: Odd Fixes
F: xen/arch/x86/tboot.c
F: xen/include/asm-x86/tboot.h
INTEL(R) VT FOR DIRECTED I/O (VT-D)
M: Kevin Tian <kevin.tian@intel.com>
S: Supported
F: xen/drivers/passthrough/vtd/
INTEL(R) VT FOR X86 (VT-X)
M: Jun Nakajima <jun.nakajima@intel.com>
M: Kevin Tian <kevin.tian@intel.com>
S: Supported
F: xen/arch/x86/hvm/vmx/
F: xen/arch/x86/mm/p2m-ept.c
F: xen/include/asm-x86/hvm/vmx/
F: xen/arch/x86/cpu/vpmu_intel.c
IOMMU VENDOR INDEPENDENT CODE
M: Jan Beulich <jbeulich@suse.com>
M: Paul Durrant <paul@xen.org>
S: Supported
F: xen/drivers/passthrough/
X: xen/drivers/passthrough/amd/
X: xen/drivers/passthrough/arm/
X: xen/drivers/passthrough/vtd/
X: xen/drivers/passthrough/device_tree.c
F: xen/include/xen/iommu.h
KCONFIG
M: Doug Goldstein <cardoe@cardoe.com>
S: Supported
F: docs/misc/kconfig{,-language}.txt
F: xen/tools/kconfig/
KDD DEBUGGER
M: Tim Deegan <tim@xen.org>
S: Odd Fixes
F: tools/debugger/kdd/
KEXEC
M: Andrew Cooper <andrew.cooper3@citrix.com>
S: Supported
F: xen/common/{kexec,kimage}.c
F: xen/include/{kexec,kimage}.h
F: xen/arch/x86/machine_kexec.c
F: xen/arch/x86/x86_64/kexec_reloc.S
LIBXENLIGHT
M: Ian Jackson <ian.jackson@eu.citrix.com>
M: Wei Liu <wl@xen.org>
M: Anthony PERARD <anthony.perard@citrix.com>
S: Supported
F: tools/libxl/
F: tools/xl/
LIVEPATCH
M: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
M: Ross Lagerwall <ross.lagerwall@citrix.com>
S: Supported
F: docs/misc/livepatch.pandoc
F: tools/misc/xen-livepatch.c
F: xen/arch/*/livepatch*
F: xen/arch/*/*/livepatch*
F: xen/common/livepatch*
F: xen/include/asm-*/livepatch.h
F: xen/include/xen/livepatch*
F: xen/test/livepatch/*
MINI-OS
M: Samuel Thibault <samuel.thibault@ens-lyon.org>
R: Wei Liu <wl@xen.org>
S: Supported
L: minios-devel@lists.xenproject.org
T: git https://xenbits.xenproject.org/git-http/mini-os.git
F: config/MiniOS.mk
OCAML TOOLS
M: Christian Lindig <christian.lindig@citrix.com>
M: David Scott <dave@recoil.org>
S: Supported
F: tools/ocaml/
OVMF UPSTREAM
M: Anthony PERARD <anthony.perard@citrix.com>
M: Wei Liu <wl@xen.org>
S: Supported
T: git https://xenbits.xenproject.org/git-http/ovmf.git
POWER MANAGEMENT
M: Jan Beulich <jbeulich@suse.com>
S: Supported
F: xen/arch/x86/acpi/
X: xen/arch/x86/acpi/boot.c
X: xen/arch/x86/acpi/lib.c
F: xen/drivers/cpufreq/
F: xen/include/acpi/cpufreq/
PUBLIC I/O INTERFACES AND PV DRIVERS DESIGNS
M: Juergen Gross <jgross@suse.com>
S: Supported
F: xen/include/public/io/
PYTHON BINDINGS
M: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
S: Supported
F: tools/python
QEMU-DM
M: Ian Jackson <ian.jackson@eu.citrix.com>
S: Supported
T: git https://xenbits.xenproject.org/git-http/qemu-xen-traditional.git
QEMU UPSTREAM
M: Stefano Stabellini <sstabellini@kernel.org>
M: Anthony Perard <anthony.perard@citrix.com>
S: Supported
T: git https://xenbits.xenproject.org/git-http/qemu-xen.git
REMUS
M: Shriram Rajagopalan <rshriram@cs.ubc.ca>
M: Yang Hongyang <imhy.yang@gmail.com>
S: Maintained
F: docs/README.remus
F: tools/libxl/libxl_remus_*
F: tools/libxl/libxl_netbuffer.c
F: tools/libxl/libxl_nonetbuffer.c
F: tools/hotplug/Linux/remus-netbuf-setup
F: tools/hotplug/Linux/block-drbd-probe
RTDS SCHEDULER
M: Dario Faggioli <dfaggioli@suse.com>
M: Meng Xu <mengxu@cis.upenn.edu>
S: Supported
F: xen/common/sched/rt.c
SCHEDULING
M: George Dunlap <george.dunlap@citrix.com>
M: Dario Faggioli <dfaggioli@suse.com>
S: Supported
F: xen/common/sched/
SEABIOS UPSTREAM
M: Wei Liu <wl@xen.org>
S: Supported
T: git https://xenbits.xenproject.org/git-http/seabios.git
STUB DOMAINS
M: Samuel Thibault <samuel.thibault@ens-lyon.org>
S: Supported
F: config/Stubdom.mk.in
F: m4/stubdom.m4
F: stubdom/
TEE MEDIATORS
M: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
S: Supported
F: xen/arch/arm/tee/
F: xen/include/asm-arm/tee
TOOLSTACK
M: Ian Jackson <ian.jackson@eu.citrix.com>
M: Wei Liu <wl@xen.org>
S: Supported
F: autogen.sh
F: config/*.in
F: install.sh
F: m4/
F: configure
F: docs/Makefile
F: docs/man/
F: stubdom/Makefile
F: *.ac
F: */configure
F: */*.ac
F: tools/
VM EVENT, MEM ACCESS and MONITOR
M: Tamas K Lengyel <tamas@tklengyel.com>
R: Alexandru Isaila <aisaila@bitdefender.com>
R: Petre Pircalabu <ppircalabu@bitdefender.com>
S: Supported
F: tools/tests/xen-access
F: xen/arch/*/monitor.c
F: xen/arch/*/vm_event.c
F: xen/arch/arm/mem_access.c
F: xen/arch/x86/mm/mem_access.c
F: xen/arch/x86/hvm/monitor.c
F: xen/arch/x86/hvm/vm_event.c
F: xen/common/mem_access.c
F: xen/common/monitor.c
F: xen/common/vm_event.c
F: xen/include/*/mem_access.h
F: xen/include/*/monitor.h
F: xen/include/*/vm_event.h
F: xen/include/asm-x86/hvm/monitor.h
F: xen/include/asm-x86/hvm/vm_event.h
VPCI
M: Roger Pau Monné <roger.pau@citrix.com>
S: Supported
F: xen/drivers/vpci/
F: xen/include/xen/vpci.h
VTPM
M: Daniel De Graaf <dgdegra@tycho.nsa.gov>
M: Quan Xu <quan.xu0@gmail.com>
S: Supported
F: extras/mini-os/tpm*
F: extras/mini-os/include/tpm*
F: stubdom/vtpm/
F: stubdom/vtpmmgr/
F: docs/misc/vtpm-platforms.txt
X86 ARCHITECTURE
M: Jan Beulich <jbeulich@suse.com>
M: Andrew Cooper <andrew.cooper3@citrix.com>
R: Wei Liu <wl@xen.org>
R: Roger Pau Monné <roger.pau@citrix.com>
S: Supported
L: xen-devel@lists.xenproject.org
F: xen/arch/x86/
F: xen/include/asm-x86/
F: xen/include/public/arch-x86/
F: xen/include/xen/lib/x86
F: xen/lib/x86
F: tools/firmware/hvmloader/
F: tools/firmware/rombios/
F: tools/firmware/vgabios/
F: tools/fuzz/cpu-policy/
F: tools/fuzz/x86_instruction_emulator/
F: tools/misc/xen-cpuid.c
F: tools/tests/cpu-policy/
F: tools/tests/x86_emulator/
X86 I/O EMULATION
M: Paul Durrant <paul@xen.org>
S: Supported
F: xen/arch/x86/hvm/emulate.c
F: xen/arch/x86/hvm/intercept.c
F: xen/arch/x86/hvm/io.c
F: xen/arch/x86/hvm/ioreq.c
F: xen/include/asm-x86/hvm/emulate.h
F: xen/include/asm-x86/hvm/io.h
F: xen/include/asm-x86/hvm/ioreq.h
F: xen/include/public/hvm/ioreq.h
X86 MEMORY MANAGEMENT
M: Jan Beulich <jbeulich@suse.com>
M: Andrew Cooper <andrew.cooper3@citrix.com>
R: George Dunlap <george.dunlap@citrix.com>
S: Supported
F: xen/arch/x86/mm/
X86 MEMORY PAGING
S: Orphaned
F: xen/arch/x86/mm/mem_paging.c
X86 MEMORY SHARING
M: Tamas K Lengyel <tamas@tklengyel.com>
S: Odd Fixes
F: xen/arch/x86/mm/mem_sharing.c
F: tools/tests/mem-sharing/
X86 SHADOW PAGETABLES
M: Tim Deegan <tim@xen.org>
S: Maintained
F: xen/arch/x86/mm/shadow/
X86 VIRIDIAN ENLIGHTENMENTS
M: Paul Durrant <paul@xen.org>
M: Wei Liu <wl@xen.org>
S: Supported
F: xen/arch/x86/guest/hyperv/
F: xen/arch/x86/hvm/viridian/
F: xen/include/asm-x86/guest/hyperv.h
F: xen/include/asm-x86/guest/hyperv-hcall.h
F: xen/include/asm-x86/guest/hyperv-tlfs.h
F: xen/include/asm-x86/hvm/viridian.h
XENTRACE
M: George Dunlap <george.dunlap@citrix.com>
S: Supported
F: tools/xentrace/
F: xen/common/trace.c
F: xen/include/xen/trace.h
XSM/FLASK
M: Daniel De Graaf <dgdegra@tycho.nsa.gov>
S: Supported
F: tools/flask/
F: xen/include/xsm/
F: xen/xsm/
F: docs/misc/xsm-flask.txt
THE REST
M: Andrew Cooper <andrew.cooper3@citrix.com>
M: George Dunlap <george.dunlap@citrix.com>
M: Ian Jackson <ian.jackson@eu.citrix.com>
M: Jan Beulich <jbeulich@suse.com>
M: Julien Grall <julien@xen.org>
M: Stefano Stabellini <sstabellini@kernel.org>
M: Wei Liu <wl@xen.org>
L: xen-devel@lists.xenproject.org
S: Supported
F: *
F: */
V: xen-maintainers-1