| Message ID | 20210114153803.2591-1-jgross@suse.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | tools/xenstore: support live update for xenstored | expand |
On 14.01.21 16:37, Juergen Gross wrote: > Today Xenstore is not restartable. This means a Xen server needing an > update of xenstored has to be rebooted in order to let this update > become effective. > > This patch series is changing that: The internal state of xenstored > (the contents of Xenstore, all connections to various clients like > programs or other domains, and watches) is saved in a defined format > and a new binary is being activated consuming the old state. All > connections are being restored and the new Xenstore binary will > continue where the old one stopped. > > This patch series has been under (secret) development until V9. > It has been posted to xen-devel only from V10 onwards. > > There will be a similar series for oxenstored posted. > > Xenstore-stubdom is not yet supported, but I'm planning to start > working on that soon. > > Changes in V11: > - dropped patches 1-3 of V10 as already appled > - new patches 1-4 (Andrew Cooper): more libxenevtchn cleanup > - new patch 12 (Edwin Torok): handle timeout of LU completely in > xenstored instead of split xenstore-control/xenstored. I've kept > the xenstore-control timeout handling for the case of premature > LU supporting downstream versions > > Changes in V10 (for the members of the security team): > - dropped patch 6 as requested by Andrew > > Juergen Gross (26): > tools/libxenevtchn: switch to standard xen coding style > tools/libxenevtchn: rename open_flags to flags > tools/libxenevtchn: check xenevtchn_open() flags for not supported > bits > tools/libxenevtchn: propagate xenevtchn_open() flags parameter > tools/libxenevtchn: add possibility to not close file descriptor on > exec > tools/xenstore: refactor XS_CONTROL handling > tools/xenstore: add live update command to xenstore-control > tools/xenstore: add basic live-update command parsing > tools/xenstore: introduce live update status block > tools/xenstore: save new binary for live update > tools/xenstore: add command line handling for live update > tools/xenstore: add support for delaying execution of a xenstore > request > tools/xenstore: add the basic framework for doing the live update > tools/xenstore: allow live update only with no transaction active > docs: update the xenstore migration stream documentation > tools/xenstore: add include file for state structure definitions > tools/xenstore: dump the xenstore state for live update > tools/xenstore: handle CLOEXEC flag for local files and pipes > tools/xenstore: split off domain introduction from do_introduce() > tools/xenstore: evaluate the live update flag when starting > tools/xenstore: read internal state when doing live upgrade > tools/xenstore: add reading global state for live update > tools/xenstore: add read connection state for live update > tools/xenstore: add read node state for live update > tools/xenstore: add read watch state for live update > tools/xenstore: activate new binary for live update > > Julien Grall (1): > tools/xenstore: handle dying domains in live update > > docs/designs/xenstore-migration.md | 19 +- > docs/misc/xenstore.txt | 21 + > tools/include/xenevtchn.h | 18 +- > tools/libs/evtchn/Makefile | 2 +- > tools/libs/evtchn/core.c | 74 ++- > tools/libs/evtchn/freebsd.c | 33 +- > tools/libs/evtchn/libxenevtchn.map | 4 + > tools/libs/evtchn/linux.c | 12 +- > tools/libs/evtchn/minios.c | 104 +++- > tools/libs/evtchn/netbsd.c | 24 +- > tools/libs/evtchn/private.h | 2 +- > tools/libs/evtchn/solaris.c | 14 +- > tools/xenstore/Makefile | 3 +- > tools/xenstore/include/xenstore_state.h | 131 +++++ > tools/xenstore/utils.c | 17 + > tools/xenstore/utils.h | 6 + > tools/xenstore/xenstore_control.c | 333 +++++++++++- > tools/xenstore/xenstored_control.c | 665 +++++++++++++++++++++++- > tools/xenstore/xenstored_control.h | 1 + > tools/xenstore/xenstored_core.c | 549 +++++++++++++++++-- > tools/xenstore/xenstored_core.h | 59 +++ > tools/xenstore/xenstored_domain.c | 301 ++++++++--- > tools/xenstore/xenstored_domain.h | 11 +- > tools/xenstore/xenstored_posix.c | 13 +- > tools/xenstore/xenstored_transaction.c | 5 + > tools/xenstore/xenstored_watch.c | 171 ++++-- > tools/xenstore/xenstored_watch.h | 5 + > 27 files changed, 2354 insertions(+), 243 deletions(-) > create mode 100644 tools/xenstore/include/xenstore_state.h > There is something wrong with the patches. Please ignore (at least from patch 12 onwards). Juergen
Today Xenstore is not restartable. This means a Xen server needing an update of xenstored has to be rebooted in order to let this update become effective. This patch series is changing that: The internal state of xenstored (the contents of Xenstore, all connections to various clients like programs or other domains, and watches) is saved in a defined format and a new binary is being activated consuming the old state. All connections are being restored and the new Xenstore binary will continue where the old one stopped. This patch series has been under (secret) development until V9. It has been posted to xen-devel only from V10 onwards. There will be a similar series for oxenstored posted. Xenstore-stubdom is not yet supported, but I'm planning to start working on that soon. Changes in V11: - dropped patches 1-3 of V10 as already appled - new patches 1-4 (Andrew Cooper): more libxenevtchn cleanup - new patch 12 (Edwin Torok): handle timeout of LU completely in xenstored instead of split xenstore-control/xenstored. I've kept the xenstore-control timeout handling for the case of premature LU supporting downstream versions Changes in V10 (for the members of the security team): - dropped patch 6 as requested by Andrew Juergen Gross (26): tools/libxenevtchn: switch to standard xen coding style tools/libxenevtchn: rename open_flags to flags tools/libxenevtchn: check xenevtchn_open() flags for not supported bits tools/libxenevtchn: propagate xenevtchn_open() flags parameter tools/libxenevtchn: add possibility to not close file descriptor on exec tools/xenstore: refactor XS_CONTROL handling tools/xenstore: add live update command to xenstore-control tools/xenstore: add basic live-update command parsing tools/xenstore: introduce live update status block tools/xenstore: save new binary for live update tools/xenstore: add command line handling for live update tools/xenstore: add support for delaying execution of a xenstore request tools/xenstore: add the basic framework for doing the live update tools/xenstore: allow live update only with no transaction active docs: update the xenstore migration stream documentation tools/xenstore: add include file for state structure definitions tools/xenstore: dump the xenstore state for live update tools/xenstore: handle CLOEXEC flag for local files and pipes tools/xenstore: split off domain introduction from do_introduce() tools/xenstore: evaluate the live update flag when starting tools/xenstore: read internal state when doing live upgrade tools/xenstore: add reading global state for live update tools/xenstore: add read connection state for live update tools/xenstore: add read node state for live update tools/xenstore: add read watch state for live update tools/xenstore: activate new binary for live update Julien Grall (1): tools/xenstore: handle dying domains in live update docs/designs/xenstore-migration.md | 19 +- docs/misc/xenstore.txt | 21 + tools/include/xenevtchn.h | 18 +- tools/libs/evtchn/Makefile | 2 +- tools/libs/evtchn/core.c | 74 ++- tools/libs/evtchn/freebsd.c | 33 +- tools/libs/evtchn/libxenevtchn.map | 4 + tools/libs/evtchn/linux.c | 12 +- tools/libs/evtchn/minios.c | 104 +++- tools/libs/evtchn/netbsd.c | 24 +- tools/libs/evtchn/private.h | 2 +- tools/libs/evtchn/solaris.c | 14 +- tools/xenstore/Makefile | 3 +- tools/xenstore/include/xenstore_state.h | 131 +++++ tools/xenstore/utils.c | 17 + tools/xenstore/utils.h | 6 + tools/xenstore/xenstore_control.c | 333 +++++++++++- tools/xenstore/xenstored_control.c | 665 +++++++++++++++++++++++- tools/xenstore/xenstored_control.h | 1 + tools/xenstore/xenstored_core.c | 549 +++++++++++++++++-- tools/xenstore/xenstored_core.h | 59 +++ tools/xenstore/xenstored_domain.c | 301 ++++++++--- tools/xenstore/xenstored_domain.h | 11 +- tools/xenstore/xenstored_posix.c | 13 +- tools/xenstore/xenstored_transaction.c | 5 + tools/xenstore/xenstored_watch.c | 171 ++++-- tools/xenstore/xenstored_watch.h | 5 + 27 files changed, 2354 insertions(+), 243 deletions(-) create mode 100644 tools/xenstore/include/xenstore_state.h