[PATCH v3 0/7] x86/time: improvements to wallclock logic

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Hello,

This series started as an attempt to change the default wallclock
preference from EFI_GET_TIME to CMOS RTC, but has grown quite a lot.
First 3 patches should be non-functional changes, mostly chopping the
current logic into smaller functions so that in patch 4 the probing vs
runtime wallclock logic can be split.

Patch 5 changes the preference to use CMOS RTC even when booted from EFI
firmware.

Finally patches 6 introduces a new command line option to bypass the
probing an allow specifying which wallclock source to use on the command
line.  Patch 7 enables CMOS RTC probing by default.

Thanks, Roger.

Roger Pau Monne (7):
  x86/time: introduce helper to fetch Xen wallclock when running as a
    guest
  x86/time: move CMOS edge detection into read helper
  x86/time: split CMOS read and probe logic into function
  x86/time: introduce probing logic for the wallclock
  x86/time: prefer CMOS over EFI_GET_TIME
  x86/time: introduce command line option to select wallclock
  x86/time: probe the CMOS RTC by default

 docs/misc/xen-command-line.pandoc |  28 +++-
 xen/arch/x86/time.c               | 238 +++++++++++++++++++++++-------
 2 files changed, 208 insertions(+), 58 deletions(-)

-- 
2.46.0