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[S390] spp: remove KVM_AWARE_CMF config option

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This config option enables or disables three single instructions
which aren't expensive. This is too fine grained.
Besided that everybody who uses kvm would enable it anyway in order
to debug performance problems.
Just remove it.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2010-05-26 23:26:21 +02:00 committed by Martin Schwidefsky
parent bac9f154ac
commit 2ffbb3f61e
3 changed files with 2 additions and 15 deletions
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2
arch/s390/kernel/entry64.S
View File

@ -65,7 +65,7 @@ _TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \
ltgr %r3,%r3
jz 0f
basr %r14,%r3
0:
0:
#endif
.endm

11
arch/s390/kvm/Kconfig
View File

@ -33,17 +33,6 @@ config KVM
If unsure, say N.
config KVM_AWARE_CMF
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

4
arch/s390/kvm/sie64a.S
View File

@ -32,12 +32,10 @@ SPI_PSW = STACK_FRAME_OVERHEAD + __PT_PSW
.macro SPP newpp
#ifdef CONFIG_KVM_AWARE_CMF
tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_SPP
jz 0f
.insn s,0xb2800000,\newpp
0:
#endif
0:
.endm
sie_irq_handler: