[PATCH guest-common/manager/qemu-server v3 0/3] fix #5032: add guest time sync via QGA

[Jakob Klocker <j.klocker@proxmox.com>]

This series adds a new agent option 'sync-time-on-resume' to
automatically synchronize the guest clock via the QEMU Guest Agent 
after operations that can leave the guest time stale. The option is 
disabled by default and only takes effect when the QEMU Guest Agent is
enabled.

When a VM resumes with a restored RAM state (waking from hibernation or
rolling back to a snapshot that includes RAM), the guest clock 
continues from the point the state was saved and no longer matches 
wall-clock time. Skews also appears whenever the guest is briefly 
frozen and resumed - after creating a snapshot, an
ordinary pause/resume, or the resume step of a live migration. 

When enabled, the option triggers a guest-set-time call:
 * after resuming from hibernation (suspend-to-disk)
 * after rolling back to a snapshot that includes RAM
 * after a live migration
 * after an ordinary pause/resume
 * after taking a snapshot

The start, resume and rollback API endpoints also accept a
'sync-time-on-resume' parameter that overrides the configured value for
a single operation. 

The persistent config option is exposed in the QEMU Guest Agent
configuration GUI, so it can be toggled per guest.

Link: https://bugzilla.proxmox.com/show_bug.cgi?id=5032

changes from v1 to v2 (thanks @Arthur)
- qemu: adapt warning message in the resume-from-saved-state path
- ui: reword the agent option label for clarity

changes from v2 to v3 (thanks @Fiona)
- add sync on pause/resume
- add override options
- add print task 
- adapt formating and naming

pve-guest-common:

Jakob Klocker (1):
  AbstractConfig: allow passing options to snapshot_rollback

 src/PVE/AbstractConfig.pm | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)


pve-manager:

Jakob Klocker (1):
  fix #5032: ui: qemu agent: add sync-time-on-resume option

 www/manager6/form/AgentFeatureSelector.js | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)


qemu-server:

Jakob Klocker (1):
  fix #5032: agent: sync guest time via QGA when the clock falls behind

 src/PVE/API2/Qemu.pm           | 46 ++++++++++++++++++++++++++---
 src/PVE/CLI/qm.pm              |  2 +-
 src/PVE/QemuConfig.pm          | 12 ++++++--
 src/PVE/QemuMigrate.pm         |  2 ++
 src/PVE/QemuServer.pm          | 18 +++++++++++-
 src/PVE/QemuServer/Agent.pm    | 54 ++++++++++++++++++++++++++++++++++
 src/PVE/QemuServer/RunState.pm | 11 ++++++-
 7 files changed, 136 insertions(+), 9 deletions(-)


Summary over all repositories:
  9 files changed, 156 insertions(+), 12 deletions(-)

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