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[S390] virtualization aware cpu measurement

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Use the SPP instruction to set a tag on entry to / exit of the virtual
machine context. This allows the cpu measurement facility to distinguish
the samples from the host and the different guests.

Signed-off-by: Carsten Otte <cotte@de.ibm.com>
This commit is contained in:
Carsten Otte
2010-05-17 10:00:04 +02:00
committed by Martin Schwidefsky
parent 6377981faf
commit cd3b70f5d4
8 changed files with 105 additions and 26 deletions
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4
arch/s390/kernel/early.c
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@@ -356,6 +356,7 @@ static __init void detect_machine_facilities(void)
{
#ifdef CONFIG_64BIT
unsigned int facilities;
unsigned long long facility_bits;
facilities = stfl();
if (facilities & (1 << 28))
@@ -364,6 +365,9 @@ static __init void detect_machine_facilities(void)
S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF;
if (facilities & (1 << 4))
S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS;
if ((stfle(&facility_bits, 1) > 0) &&
(facility_bits & (1ULL << (63 - 40))))
S390_lowcore.machine_flags |= MACHINE_FLAG_SPP;
#endif
}