Public bug reported:
SRU Justification
[Impact]
* Microsoft requested patches to work around intermittent deployment
failures on AMDv4 VM sizes due to issues with large values of Hyper-V
timer as part of LP: #2137674. Fixes in the hypervisor have been rolled
out, so the SAUCE patches can be reverted.
[Fix]
Revert the following SAUCE patches
- "UBUNTU: SAUCE: clocksource: hyper-v: do not use an insanely big TSC in
hv_read_tsc_page_tsc()"
- "UBUNTU: SAUCE: clocksource: hyper-v: use the APIC timer if the Hyper-V
timer is unreliable on some CPUs"
[Test Plan]
* Compile tested
* Microsoft tested
[Regression potential]
* Upstream changes are largely localized to time and clock source functions,
and have been upstream for some time. Regression likliehood is slim.
* Possible regressions could result in unexpected behavior of Hyper-V driver.
[Other info]
* SF#00422328
** Affects: linux-azure (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux-azure (Ubuntu Jammy)
Importance: Undecided
Status: New
** Affects: linux-azure (Ubuntu Noble)
Importance: Undecided
Status: New
** Affects: linux-azure (Ubuntu Resolute)
Importance: Undecided
Status: New
** Affects: linux-azure (Ubuntu Stonking)
Importance: Undecided
Status: New
** Also affects: linux-azure (Ubuntu Resolute)
Importance: Undecided
Status: New
** Also affects: linux-azure (Ubuntu Stonking)
Importance: Undecided
Status: New
** Also affects: linux-azure (Ubuntu Jammy)
Importance: Undecided
Status: New
** Also affects: linux-azure (Ubuntu Noble)
Importance: Undecided
Status: New
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2167893
Title:
Revert SAUCE: AMDv4 VMs may get no timer interrupts or suffer from
timer interrupt storms
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