Re: [PATCH v11 00/27] tools/xenstore: support live update for xenstored

[Jürgen Groß <jgross@xxxxxxxx>]

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

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