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 [Fix] * Questing and Noble: - cherry-picks of the following SAUCE patches from Microsoft (https://github.com/dcui/linux/tree/decui/Ubuntu-azure-6.8-6.8.0-1043.49_22.04.1-V2): - 28b18cb: "UBUNTU: SAUCE: clocksource: hyper-v: do not use an insanely big TSC in hv_read_tsc_page_tsc()" - f796530: "UBUNTU: SAUCE: clocksource: hyper-v: use the APIC timer if the Hyper-V timer is unreliable on some CPUs" * Jammy: - cherry-pick of the following SAUCE patch from Microsoft (https://github.com/dcui/linux/tree/decui/Ubuntu-azure-6.8-6.8.0-1043.49_22.04.1-V2): - 28b18cb: "UBUNTU: SAUCE: clocksource: hyper-v: do not use an insanely big TSC in hv_read_tsc_page_tsc()" - backport of the following SAUCE patch from Microsoft (https://github.com/dcui/linux/tree/decui/Ubuntu-azure-6.8-6.8.0-1043.49_22.04.1-V2): - f796530: "UBUNTU: SAUCE: clocksource: hyper-v: use the APIC timer if the Hyper-V timer is unreliable on some CPUs" - cherry-pick of the following upstream patches - fd0c6b0: "x86/vdso: Fix gettimeofday masking" - 4b52223: "clocksource: hyper-v: Provide noinstr sched_clock()" - backports of the following upstream patches - 9dfb6bf: "clocksource: hyper-v: Adjust hv_read_tsc_page_tsc() to avoid special casing U64_MAX" - 47a2a14: "clocksource: hyper-v: Introduce a pointer to TSC page" [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 Questing) Importance: Undecided Status: New ** Affects: linux-azure (Ubuntu Resolute) Importance: Undecided Status: New ** Tags: kernel-daily-bug ** Also affects: linux-azure (Ubuntu Noble) Importance: Undecided Status: New ** Also affects: linux-azure (Ubuntu Jammy) Importance: Undecided Status: New ** Also affects: linux-azure (Ubuntu Questing) Importance: Undecided Status: New ** Also affects: linux-azure (Ubuntu Resolute) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2137674 Title: [Azure] AMDv4 VMs may get no timer interrupts or suffer from timer interrupt storms To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/2137674/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
