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Laine Stump 73c0a148af qemu: support event_idx parameter for virtio disk and net devices 
In some versions of qemu, both virtio-blk-pci and virtio-net-pci
devices can have an event_idx setting that determines some details of
event processing. When it is enabled, it "reduces the number of
interrupts and exits for the guest". qemu will automatically enable
this feature when it is available, but there may be cases where this
new feature could actually make performance worse (NB: no such case
has been found so far).

As a safety switch in case such a situation is encountered in the
field, this patch adds a new attribute "event_idx" to the <driver>
element of both disk and interface devices. event_idx can be set to
"on" (to force event_idx on in case qemu has it disabled by default)
or "off" (for force event_idx off). In the case that event_idx support
isn't present in qemu, the attribute is ignored (this on the advice of
the qemu developer).

docs/formatdomain.html.in: document the new flag (marking it as
   "don't mess with this!"
docs/schemas/domain.rng: add event_idx in appropriate places
src/conf/domain_conf.[ch]: add event_idx to parser and formatter
src/libvirt_private.syms: export
   virDomainVirtioEventIdx(From|To)String
src/qemu/qemu_capabilities.[ch]: detect and report event_idx in
   disk/net
src/qemu/qemu_command.c: add event_idx parameter to qemu commandline
    when appropriate.
tests/qemuxml2argvdata/qemuxml2argv-event_idx.args,
tests/qemuxml2argvdata/qemuxml2argv-event_idx.xml,
tests/qemuxml2argvtest.c,
tests/qemuxml2xmltest.c: test cases for event_idx.
 		2011-08-15 09:35:42 -04:00
.gnulib@4470580881 build: fix regression in large file support 2011-08-08 09:59:52 -06:00
daemon libvirtd.init.in: stop/restart() - wrong return value in case of failure 2011-08-15 15:44:39 +08:00
docs qemu: support event_idx parameter for virtio disk and net devices 2011-08-15 09:35:42 -04:00
examples maint: add missing copyright notices 2011-07-28 15:01:17 -06:00
gnulib freebsd: Fix build problem due to picking up the wrong libvirt.h 2011-07-29 07:35:54 -06:00
include storage: Directory shouldn't be listed as type 'file' 2011-08-11 13:34:26 -06:00
m4 tests: Lower stack usage below 4096 bytes 2011-04-30 19:59:52 +02:00
po Add some APIs which use locking for crashsafe pidfile handling 2011-08-12 20:37:00 +01:00
python python: avoid unlikely sign extension bug 2011-08-02 11:57:07 -06:00
src qemu: support event_idx parameter for virtio disk and net devices 2011-08-15 09:35:42 -04:00
tests qemu: support event_idx parameter for virtio disk and net devices 2011-08-15 09:35:42 -04:00
tools virsh: fix dead store 2011-08-12 12:27:06 -06:00
.dir-locals.el maint: let emacs avoid tabs in rng files 2011-08-13 08:56:26 -06:00
.gitignore freebsd: Fix build problem due to picking up the wrong libvirt.h 2011-07-29 07:35:54 -06:00
.gitmodules make .gnulib a submodule 2009-07-08 16:17:51 +02:00
.mailmap virsh: Avoid using magic numbers for logging 2011-07-14 07:03:40 -06:00
AUTHORS libvirtd.init.in: stop/restart() - wrong return value in case of failure 2011-08-15 15:44:39 +08:00
COPYING.LIB remove all trailing blank lines 2009-07-16 15:06:42 +02:00
ChangeLog-old generate ChangeLog from git logs into distribution tarball 2009-07-08 16:17:51 +02:00
HACKING build: rename files.h to virfile.h 2011-07-21 10:34:51 -06:00
Makefile.am maint: add missing copyright notices 2011-07-28 15:01:17 -06:00
Makefile.nonreentrant Ban use of all inet_* functions 2010-10-22 11:59:23 +01:00
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
TODO Update todo list file to point at bugzilla/website 2010-10-13 16:45:26 +01:00
autobuild.sh Remove the Open Nebula driver 2011-03-28 14:09:11 +01:00
autogen.sh build: avoid problems with autogen.sh runs from tarball 2011-02-12 06:28:28 -07:00
bootstrap build: update to latest gnulib 2011-06-23 10:52:08 -06:00
bootstrap.conf Add API for duplicating a socket/client file descriptor 2011-08-15 15:21:26 +02:00
cfg.mk bandwidth: Add parsing and free functions 2011-07-25 13:49:33 +08:00
configure.ac Fix detection of GnuTLS 1.x.y 2011-08-03 19:22:29 +02:00
libvirt.pc.in * libvirt.pc.in: applied patch from Daniel Berrange to fix --cflags 2006-03-24 13:18:12 +00:00
libvirt.spec.in Release of libvirt-0.9.4 2011-08-03 11:02:42 +08:00
mingw32-libvirt.spec.in conf: put virtPortProfile struct / functions in a common location 2011-07-21 14:46:33 -04:00

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>