The current implementation of xen guest save/restore/checkpoint functionality
uses PM_SUSPEND and PM_RESUME events. This is not optimal when taking
checkpoints of a virtual machine (where the suspend hypercall returns
non-zero, requiring the devices and xenbus to just pickup from where they left
off instead of a complete teardown/reconnect to backend).
The following set of patches modify this implementation to use Hibernate style
control flow (freeze/restore for save/restore and freeze/thaw for checkpoint,
which is merely a cancelled save akin to failed swsusp() ).
These patches are against Ian Campbell's PVHVM tree at
git://xenbits.xen.org/people/ianc/linux-2.6.git for-stefano/pvhvm
at commit 8a8d1bc753c4e2dda5f2890292d60c67d6ebb573
kernel version: 2.6.38-rc4
Save/Restore and Checkpoint functionality have been tested on PV and PV-HVM
Guest Domains. Patches have been run through checkpatch.pl.
Changes since last resend(s):
- xenbus_pm_ops has static const qualifier..
- The conditional macro CONFIG_HIBERNATION around the freeze/thaw/restore
cases in pm_op and pm_noirq_op functions in drivers/base/power/main.c has
been expanded to CONFIG_HIBERNATION || CONFIG_XEN_SAVE_RESTORE.
- CONFIG_PM_SLEEP in drivers/xen/manage.c has been changed to
CONFIG_XEN_SAVE_RESTORE
Kazuhiro SUZUKI (1):
xen: xenbus PM events support
Shriram Rajagopalan (2):
xen: use freeze/restore/thaw PM events for suspend/resume/chkpt
PM: pm.h - Add comments about Xen save/restore/chkpt use case
drivers/base/power/main.c | 8 ++++----
drivers/xen/manage.c | 16 ++++++++--------
drivers/xen/xenbus/xenbus_probe.c | 12 ++++++++++--
drivers/xen/xenbus/xenbus_probe.h | 3 ++-
drivers/xen/xenbus/xenbus_probe_frontend.c | 11 +++++++++--
include/linux/pm.h | 19 +++++++++++++++++++
include/xen/xenbus.h | 2 +-
7 files changed, 53 insertions(+), 18 deletions(-)
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