| author | Jan Kiszka <jan.kiszka@siemens.com> | |
| Fri, 24 Nov 2017 06:14:27 +0000 (07:14 +0100) | ||
| committer | Jan Kiszka <jan.kiszka@siemens.com> | |
| Mon, 27 Nov 2017 07:36:04 +0000 (08:36 +0100) | ||
| commit | 42522ce748d34ebf25df40753f7b928f76b47c61 | |
| tree | b6c219879f5e4a94152d92f707dbad1e0176c0b0 | tree | snapshot (tar.xz tar.gz zip) |
| parent | 5c969979cb0298b0706a5f78ad51da91fa8046cd | commit | diff |
x86, driver, tools: Pass TSC and APIC timer frequency calibration to non-root cells
This avoids that non-root cells have to calibrate TSC and - provided
there is no TSC deadline timer support - APIC timer frequencies
themselves. Rather we now either use statically configured values from
the system configuration or, of those or 0, pick them up from the root
cell during hypervisor start. Then the values are simply forwarded via
the Communication Region to all x86 non-root cells.
This requires another patch to the root-cell Linux to export
lapic_timer_frequency for us.
CC: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
This avoids that non-root cells have to calibrate TSC and - provided
there is no TSC deadline timer support - APIC timer frequencies
themselves. Rather we now either use statically configured values from
the system configuration or, of those or 0, pick them up from the root
cell during hypervisor start. Then the values are simply forwarded via
the Communication Region to all x86 non-root cells.
This requires another patch to the root-cell Linux to export
lapic_timer_frequency for us.
CC: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>