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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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Jim Fehlig 5325123d23 libxl: support Xen migration stream V2 in save/restore 
Xen 4.6 introduced a new migration stream commonly referred to as
"migration V2". Xen 4.6 and newer always produce this new stream,
whereas Xen 4.5 and older always produce the legacy stream.
Support for migration stream V2 can be detected at build time with
LIBXL_HAVE_SRM_V2 from libxl.h. The legacy and V2 streams are not
compatible, but a V2 host can accept and convert a legacy stream.

Commit e7440656 changed the libxl driver to use the lowest libxl
API version possible (version 0x040200) to ensure the driver
builds against older Xen releases. The old 4.2 restore API does
not support specifying a stream version and assumes a legacy
stream, even if the incoming stream is migration V2. Thinking it
has been given a legacy stream, libxl will fail to convert an
incoming stream that is already V2, which causes the entire
restore operation to fail. Xen's libvirt-related OSSTest has been
failing since commit e7440656 landed in libvirt.git master. One
of the more recent failures can be seen here

http://lists.xenproject.org/archives/html/xen-devel/2016-05/msg00071.html

This patch changes the call to libxl_domain_create_restore() to
include the stream version if LIBXL_HAVE_SRM_V2 is defined. The
version field of the libxlSavefileHeader struct is also updated
to '2' when LIBXL_HAVE_SRM_V2 is defined, ensuring the stream
version in the header matches the actual stream version produced
by Xen. Along with bumping the libxl API requirement to 0x040400,
this patch fixes save/restore on a migration V2 Xen host.

Oddly, migration has never used the libxlSavefileHeader. It
handles passing configuration in the Begin and Prepare phases,
and then calls libxl directly to transfer domain state/memory
in the Perform phase. A subsequent patch will add stream
version handling in the Begin and Prepare phase handshaking,
which will fix the migration related OSSTest failures.

Signed-off-by: Jim Fehlig <jfehlig@suse.com>
2016-05-10 14:23:37 -06:00
.gnulib@6cc32c63e8 maint: update to latest gnulib 2016-01-04 13:56:35 -07:00
build-aux bracket-spacing: Add syntax-check for unnecessary curly brackets 2014-11-14 17:13:36 +01:00
daemon admin: Introduce virAdmClientClose API 2016-05-10 16:05:17 +02:00
docs docs: Fix disk "volume" description 2016-05-10 15:53:02 -04:00
examples examples: Try harder to uninstall nwfilter 2016-04-20 17:33:55 +02:00
gnulib maint: update to latest gnulib 2016-01-04 13:56:35 -07:00
include/libvirt admin: Introduce virAdmClientClose API 2016-05-10 16:05:17 +02:00
m4 uml: only build on Linux 2016-05-10 07:42:35 +03:00
po Pull latest translations from zanata 2016-05-04 12:11:23 +01:00
src libxl: support Xen migration stream V2 in save/restore 2016-05-10 14:23:37 -06:00
tests seclabeltest: Update to use VIRT_TEST_MAIN 2016-05-10 17:16:11 +02:00
tools virt-admin: Introduce client-disconnect command 2016-05-10 16:05:17 +02:00
.ctags
.dir-locals.el
.gitignore Add qemucapsprobe in .gitignore 2016-05-05 10:09:59 +02:00
.gitmodules
.mailmap maint: update .mailmap for recent contributions 2015-03-20 06:17:55 -06:00
AUTHORS.in Change maintainers list 2016-02-12 13:10:05 +03:00
autobuild.sh Disable libvirtd by default when building on Win32 2014-04-29 11:30:32 +01:00
autogen.sh maint: improve usage of autogen's --no-git 2015-02-06 11:35:29 -07:00
bootstrap maint: update to latest gnulib 2016-01-04 13:56:35 -07:00
bootstrap.conf bootstrap: Don't require python-config 2015-08-06 14:35:14 +02:00
cfg.mk syntax-check: Enforce <code> inside <dt> elements 2016-04-25 12:09:34 +02:00
ChangeLog-old Fix typos in src/* 2014-04-21 16:49:08 -06:00
config-post.h nss: Implement _nss_libvirt_gethostbyname3_r 2016-03-18 17:29:53 +01:00
configure.ac libxl: switch to using libxl_domain_create_restore from v4.4 API 2016-05-10 14:23:37 -06:00
COPYING
COPYING.LESSER maint: Remove control characters from LGPL license file 2015-09-25 09:16:24 +02:00
HACKING maint: document use of zanata for translations 2015-06-10 15:26:44 -06:00
libvirt-admin.pc.in Add libvirt-admin library 2015-06-16 13:46:20 +02:00
libvirt-lxc.pc.in Add pkg-config files for libvirt-qemu & libvirt-lxc 2014-06-23 16:17:27 +01:00
libvirt-qemu.pc.in Add pkg-config files for libvirt-qemu & libvirt-lxc 2014-06-23 16:17:27 +01:00
libvirt.pc.in Add pkg-config files for libvirt-qemu & libvirt-lxc 2014-06-23 16:17:27 +01:00
libvirt.spec.in libvirt.spec: remove duplicate files from -docs package 2016-05-04 10:11:37 +01:00
Makefile.am Makefile: Enable distuninstallcheck again 2016-04-25 18:56:48 +02:00
Makefile.nonreentrant
mingw-libvirt.spec.in parallels: substitute parallels with vz spec file and Makefile 2015-06-17 15:07:55 +03:00
README
README-hacking docs: update README-hacking 2014-05-06 16:20:24 -06:00
run.in Add PKG_CONFIG_PATH to run.in script. 2014-06-26 14:32:35 +01:00
TODO

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>