path: root/arch/s390/kvm/Kconfig
diff options
authorCarsten Otte <cotte@de.ibm.com>2010-05-17 10:00:04 +0200
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2010-05-17 10:00:15 +0200
commitcd3b70f5d4d82f85d1e1d6e822f38ae098cf7c72 (patch)
treeaa394e63d300312bece2afb53a53dfd93a0f5f23 /arch/s390/kvm/Kconfig
parent6377981faf1a4425b0531e577736ef03df97c8f6 (diff)
[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/kvm/Kconfig')
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig
index a7251580891c..2f4b687cc7fa 100644
--- a/arch/s390/kvm/Kconfig
+++ b/arch/s390/kvm/Kconfig
@@ -33,6 +33,17 @@ config KVM
If unsure, say N.
+ depends on KVM
+ bool "KVM aware sampling"
+ ---help---
+ This option enhances the sampling data from the CPU Measurement
+ Facility with additional information, that allows to distinguish
+ guest(s) and host when using the kernel based virtual machine
+ functionality.
+ If unsure, say N.
# OK, it's a little counter-intuitive to do this, but it puts it neatly under
# the virtualization menu.
source drivers/vhost/Kconfig