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| author | Carsten Otte <cotte@de.ibm.com> | 2010-05-17 10:00:04 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2010-05-17 10:00:15 +0200 |
| commit | cd3b70f5d4d82f85d1e1d6e822f38ae098cf7c72 (patch) | |
| tree | aa394e63d300312bece2afb53a53dfd93a0f5f23 /arch/s390/kernel/early.c | |
| parent | [S390] idle time accounting vs. machine checks (diff) | |
| download | linux-cd3b70f5d4d82f85d1e1d6e822f38ae098cf7c72.tar.xz linux-cd3b70f5d4d82f85d1e1d6e822f38ae098cf7c72.zip | |
[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>
Diffstat (limited to 'arch/s390/kernel/early.c')
| -rw-r--r-- | arch/s390/kernel/early.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c index 2d92c2cf92d7..c00856ad4e5a 100644 --- a/arch/s390/kernel/early.c +++ b/arch/s390/kernel/early.c @@ -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 } |