** Changed in: linux-azure-4.15 (Ubuntu Bionic)
Importance: Undecided => Medium
** Changed in: linux-azure-4.15 (Ubuntu)
Status: New => Invalid
** Changed in: linux-azure (Ubuntu)
Status: New => Invalid
** Changed in: linux-azure (Ubuntu Eoan)
Importance: Undecided => Medium
** Changed in: linux-azure (Ubuntu Focal)
Importance: Undecided => Medium
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Packages, which is subscribed to linux-azure in Ubuntu.
https://bugs.launchpad.net/bugs/1875467
Title:
Enable Invariant TSC Support
Status in linux-azure package in Ubuntu:
Invalid
Status in linux-azure-4.15 package in Ubuntu:
Invalid
Status in linux-azure source package in Bionic:
Invalid
Status in linux-azure-4.15 source package in Bionic:
Confirmed
Status in linux-azure source package in Eoan:
Confirmed
Status in linux-azure-4.15 source package in Eoan:
Invalid
Status in linux-azure source package in Focal:
Confirmed
Status in linux-azure-4.15 source package in Focal:
Invalid
Bug description:
Microsoft would like to request two commits in all releases supported
on Azure. These commits benefit SAP workloads.
These requested commits will enable support for Invariant TSC in Linux
guest VMs. The invariant TSC means that the TSC continues at a fixed
rate regardless of the C-state or frequency of the processor (as long
as the processor remains in the ACPI S0 state).
These patches will allow guests to access the
HvSyntheticInvariantTscControl MSR and set bit 0 of this synthetic
MSR, which then enables the InvariantTSC feature. After setting the
synthetic MSR, CPUID will enumerate support for InvariantTSC.
The following two commits enable support:
9e0333ae38ee ("clocksource/drivers/hyper-v: Set TSC clocksource as default w/
InvariantTSC")
dce7cd62754b ("x86/hyperv: Allow guests to enable InvariantTSC")
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