[PATCH v2] arm64: Implement prctl(PR_{G,S}ET_TSC)

[Peter Collingbourne]

On Fri, May 17, 2024 at 2:25 PM Peter Collingbourne <pcc at google.com> wrote:
>
> On arm64, this prctl controls access to CNTVCT_EL0, CNTVCTSS_EL0 and
> CNTFRQ_EL0 via CNTKCTL_EL1.EL0VCTEN. Since this bit is also used to
> implement various erratum workarounds, check whether the CPU needs
> a workaround whenever we potentially need to change it.

Ping.

Peter