x86: split get_cycles_sync

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This patch splits get_cycles_sync() into  __get_cycles_sync(),
and the rdtscll part. Paravirt guests cannot issue rdtscl directly,
as it involves a function call in vdso area.

So, using the __get_cycles_sync() base, we introduce vget_cycles_sync,
which then calls the native version of rdtscll. Ideally, however, a guest
should define its own clocksource, together with a vread function

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

...

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Glauber de Oliveira Costa 2008-01-30 13:31:03 +01:00 • committed by Ingo Molnar

parent 16e2011be6

commit 4e87173eac

2 changed files with 34 additions and 5 deletions

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arch/x86/kernel/tsc_64.c

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37

include/asm-x86/tsc.h

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