Re: [PATCH v5 05/16] clocksource/hyperv: use MSR-based access if running as root

On Wed, Jan 20, 2021 at 11:13:28AM -0500, Pavel Tatashin wrote:

On Wed, Jan 20, 2021 at 7:01 AM Wei Liu [off-list ref] wrote:

quoted

When Linux runs as the root partition, the setup required for TSC page
is different.

Why would we need a TSC page as a clock source for root partition at
all? I think the above can be removed.

The TSC page is considered superior to MSR-based clock. In the future we
may want to switch back to that TSC page instead.

I think it provides more context than without.

Wei.

 Luckily Linux also has access to the MSR based

quoted

clocksource. We can just disable the TSC page clocksource if Linux is
the root partition.