tjh.dev / kernel
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[S390] spp: remove KVM_AWARE_CMF config option

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>

authored by Heiko Carstens and committed by Martin Schwidefsky 2ffbb3f6 bac9f154

+2 -15
unified split
+1 -1
arch/s390/kernel/entry64.S
··· 65 65 ltgr %r3,%r3 66 66 jz 0f 67 67 basr %r14,%r3 68 - 0: 68 + 0: 69 69 #endif 70 70 .endm 71 71
-11
arch/s390/kvm/Kconfig
··· 33 33 34 34 If unsure, say N. 35 35 36 - config KVM_AWARE_CMF 37 - depends on KVM 38 - bool "KVM aware sampling" 39 - ---help--- 40 - This option enhances the sampling data from the CPU Measurement 41 - Facility with additional information, that allows to distinguish 42 - guest(s) and host when using the kernel based virtual machine 43 - functionality. 44 - 45 - If unsure, say N. 46 - 47 36 # OK, it's a little counter-intuitive to do this, but it puts it neatly under 48 37 # the virtualization menu. 49 38 source drivers/vhost/Kconfig
+1 -3
arch/s390/kvm/sie64a.S
··· 32 32 33 33 34 34 .macro SPP newpp 35 - #ifdef CONFIG_KVM_AWARE_CMF 36 35 tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_SPP 37 36 jz 0f 38 37 .insn s,0xb2800000,\newpp 39 - 0: 40 - #endif 38 + 0: 41 39 .endm 42 40 43 41 sie_irq_handler: