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Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
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Daniel P. Berrange 6829f0e40a Fix potential deadlock across fork() in QEMU driver 
https://bugzilla.redhat.com/show_bug.cgi?id=964358

The hook scripts used by virCommand must be careful wrt
accessing any mutexes that may have been held by other
threads in the parent process. With the recent refactoring
there are 2 potential flaws lurking, which will become real
deadlock bugs once the global QEMU driver lock is removed.

Remove use of the QEMU driver lock from the hook function
by passing in the 'virQEMUDriverConfigPtr' instance directly.

Add functions to the virSecurityManager to be invoked before
and after fork, to ensure the mutex is held by the current
thread. This allows it to be safely used in the hook script
in the child process.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
(cherry picked from commit 61b52d2e38)

Conflicts:
	src/libvirt_private.syms - context
	src/qemu/qemu_process.c - no backport of qemud_driver struct rename
	src/security/security_manager.c - no backport of making the security driver self-locking; just expose the interface
2013-07-22 17:25:47 -06:00
.gnulib@b4938324b7 build: avoid infinite autogen loop 2012-10-27 15:06:31 -04:00
build-aux maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
daemon Tweak EOF handling of streams 2013-06-11 18:28:23 -04:00
docs Convert libxl driver to Xen 4.2 2013-01-07 10:40:02 -07:00
examples maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
gnulib build: fix fresh checkout on RHEL5 2012-04-19 17:11:43 -06:00
include maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
m4 build: avoid -Wno-format on new-enough gcc 2012-10-18 13:11:29 -04:00
po Prep for release 0.10.2.6 2013-06-12 17:06:18 -04:00
python Properly parse (unsigned) long long 2012-10-18 13:19:51 -04:00
src Fix potential deadlock across fork() in QEMU driver 2013-07-22 17:25:47 -06:00
tests smartcard: spell ccid-card-emulated qemu property correctly 2013-06-11 16:51:18 -04:00
tools virsh: edit: don't leak XML string on reedit or redefine 2013-06-26 17:43:28 +02:00
.dir-locals.el build: avoid tabs that failed syntax-check 2012-09-06 09:43:46 -06:00
.gitignore tools: Only install guests init script if --with-init=script=redhat 2013-01-07 11:26:52 -07:00
.gitmodules make .gnulib a submodule 2009-07-08 16:17:51 +02:00
.mailmap Autogenerate AUTHORS 2012-10-27 15:07:44 -04:00
AUTHORS.in Doug Goldstein gained commit capability 2012-12-09 16:28:00 -05:00
autobuild.sh Switch automated builds to use Mingw64 toolchain instead of Mingw32 2012-06-25 10:41:10 +01:00
autogen.sh build: fix incremental autogen.sh when no AUTHORS is present 2012-12-09 16:53:41 -05:00
bootstrap maint: regenerate bootstrap 2012-07-27 09:34:04 -06:00
bootstrap.conf Autogenerate AUTHORS 2012-10-27 15:07:44 -04:00
cfg.mk build: fix incremental autogen.sh when no AUTHORS is present 2012-12-09 16:53:41 -05:00
ChangeLog-old virterror.c: Fix several spelling mistakes 2012-02-03 11:32:51 -07:00
configure.ac util: make virSetUIDGID async-signal-safe 2013-07-22 16:48:37 -06:00
COPYING.LIB remove all trailing blank lines 2009-07-16 15:06:42 +02:00
HACKING Update how to compile with -Werror 2012-10-17 16:18:22 -04:00
libvirt.pc.in build: silence warning from autoconf 2012-05-30 09:22:02 -06:00
libvirt.spec.in Prep for release 0.10.2.6 2013-06-12 17:06:18 -04:00
Makefile.am Autogenerate AUTHORS 2012-10-27 15:07:44 -04:00
Makefile.nonreentrant Ban use of all inet_* functions 2010-10-22 11:59:23 +01:00
mingw-libvirt.spec.in parallels: add driver skeleton 2012-08-01 11:44:26 +08:00
README Correct typos in the documentation (Atsushi SAKAI) 2008-01-24 10:15:13 +00:00
README-hacking maint: relax git minimum version 2010-02-24 14:29:27 -05:00
run.in syntax-check: fix run.in 2012-09-18 13:59:53 +02:00
TODO Update todo list file to point at bugzilla/website 2010-10-13 16:45:26 +01:00

README 

         LibVirt : simple API for virtualization

  Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.

Daniel Veillard <veillard@redhat.com>