[S390] virtualization aware cpu measurement
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>
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 2d92c2c..c00856a 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -356,6 +356,7 @@
{
#ifdef CONFIG_64BIT
unsigned int facilities;
+ unsigned long long facility_bits;
facilities = stfl();
if (facilities & (1 << 28))
@@ -364,6 +365,9 @@
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
}