The source of problem was clockevent_program_event returns -ETIME:
------------ kernel/time/clockevents.c:
/**
* clockevents_program_event - Reprogram the clock event device.
* @expires: absolute expiry time (monotonic clock)
*
* Returns 0 on success, -ETIME when the event is in the past.
*/
int clockevents_program_event(struct clock_event_device *dev, ktime_t
expires,
ktime_t now)
-------------
xen_vcpuop_set_next_event schedules event by getting current time
(xen_clocksource_read()) (*1) adding delta (expires-now) and programming
event with VCPUOP_set_singleshot_timer hypercall. Then xen gets current
time (*2) and in some rare cases this time is after expected timer
expiration... Even after VCPUOP_set_singleshot_timer hypercal,
xen_clocksource_read() reports time slightly in the past comparing to
xen time (reported by NOW() macro).
I think this is because "current" time is calculated different way in *1
and *2. The *1 way is controlled by tsc_mode, which is described here:
http://lxr.xensource.com/lxr/source/docs/misc/tscmode.txt. Default
tsc_mode=0 is "smart" and I think because of that can be slightly before
NOW() time. tsc_mode=2 is almost the same as NOW() macro works.
After all tsc_mode=2 was default in xen-3.4.
Get kernel from global kernels dir (/var/lib/qubes/vm-kernels), not per-VM. Can
be configured by qvm-prefs (kernel parameter).
New tool: qvm-set-default-kernel
For backward compatibility kernel=None means kernel in VM dir (kernels subdir).
(possibly empty) modules.img should be created in it.
Mainly 4 parts:
- scripts for providing rpmdb and yum repos to VM (choosen by qvm-set-updatevm)
- VM script for downloading updates (qubes_download_dom0_updates.sh)
- qfile-dom0-unpacker which receive updates, check signatures and place its in dom0 local yum repo
- qvm-dom0-upgrade which calls all of above and after all yum gpk-update-viewer
Besides qvm-dom0-upgrade, updates are checked every 6h and user is prompted if
want to download it. At dom0 side gpk-update-icon (disabled yet) should notice
new updates in "local" repo.
