Some DM's virtual timer devices use CLOCK_REALTIME as either clock
counter source or period timer source. Including:
- virtual RTC
- virtual PIT
- virtual HPET
According to Linux Manual, CLOCK_REALTIME is the 'wall clock' which is
affected by discontinuous jumps in the system time.
The issue is that service VM system time could be changed, either by
root user manually or by NTP automatically calibration.
When that happens, DM's virtual timer devices which relays on
CLOCK_REALTIME will experience discontinuous time jump, and become
inaccurate. It would affect both time stamp read value and period timer.
Especially when service VM system time is moved backwards, WaaG's system
software will lost response and be stalled for quite a long time.
To solve this issue, we need to switch CLOCK_REALTIME to
CLOCK_MONOTONIC. As it represents:
'A nonsettable monotonically increasing clock that measures time from
some unspecified point in the past that does not change after system
startup'
Tracked-On: #8547
Signed-off-by: Wu Zhou <wu.zhou@intel.com>
Reviewed-by: Jian Jun Chen <jian.jun.chen@intel.com>
Modified the copyright year range in code, and corrected "int32_tel"
into "Intel" in two "hypervisor/include/debug/profiling.h" and
"hypervisor/include/debug/profiling_internal.h".
Tracked-On: #7559
Signed-off-by: Ziheng Li <ziheng.li@intel.com>
Unifies the logs to pr_* interfaces instead of printf for better log management.
Tracked-On: #5267
Signed-off-by: Sun Peng <peng.p.sun@intel.com>
Reviewed-by: Chi Mingqiang <mingqiang.chi@intel.com>
Acked-by: Wang, Yu1 <yu1.wang@intel.com>
Remove the use of assert() in vHPET.
Tracked-On: #3252
Signed-off-by: Peter Fang <peter.fang@intel.com>
Reviewed-by: <yonghua.huang@intel.com>
Acked-by: Yin, Fengwei <fengwei.yin@intel.com>
Need to properly remove and free its MMIO entry during deinit.
Tracked-On: #2453
Signed-off-by: Peter Fang <peter.fang@intel.com>
Acked-by: Yin Fengwei <fengwei.yin@intel.com>
vHPET is used as a source of system timer by UEFI (e.g. OVMF).
This provides an alternative to using vPIT, which OVMF assumes is always
connected to vPIC.
This is ported from Bhyve, with a few changes:
- move to user space, using acrn_timer
- enable timers only when necessary
Origin: FreeBSD
License: BSD-3-Clause
URL: https://svnweb.freebsd.org/
commit: 326257
Purpose: Adding vHPET support.
Maintained-by: External
Tracked-On: #2319
Signed-off-by: Peter Fang <peter.fang@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>
