Benjamin Lamowski 02b7878229 hw: always serialize rdtsc reads ...

While implementing TSC calibration in #5215, the issue of properly serializing
TSC reads came up. Some learnings of the discussion were noted in #5430.

Using `cpuid` for serialization as in Trace::timestamp() is portable,
but will cause VM exits on VMX and SVM and is therefore unsuitable to
retain a roughly working calibration loop while running virtualized.
On the other hand on most AMD systems, dispatch serializing `lfence`
needs to be explicitly enabled via a non-architectural MSR.

Enable setting up dispatch serializing lfence on AMD systems and always
serialize rdtsc accesses in Hw::Tsc::rdtsc() for maximum reliability.

Issues #5215, #5430

2025-01-30 16:30:14 +01:00

..

board

base-hw: move imx53-specifics to imx repository

2024-06-20 13:25:06 +02:00

etc

base: remove SPEC variables of boards (fix #3971)

2021-01-25 13:58:09 +01:00

include

hw: calibrate Local APIC via ACPI timer

2025-01-30 16:30:14 +01:00

lib/mk

hw: calibrate Local APIC via ACPI timer

2025-01-30 16:30:14 +01:00

recipes

hw: ensure board_name is set as depot build

2025-01-30 16:30:14 +01:00

run

hw: replace double_list implementation

2024-02-26 08:59:09 +01:00

src

hw: always serialize rdtsc reads

2025-01-30 16:30:14 +01:00