[S390] spp: remove KVM_AWARE_CMF config option (2ffbb3f6) · Commits · 戴 / test

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>

arch/s390/kvm/Kconfig

+0 −11

Original line number	Diff line number	Diff line
		@@ -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

arch/s390/kvm/sie64a.S

+1 −3

Original line number	Diff line number	Diff line
		@@ -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
		.endm

		sie_irq_handler:

arch/s390/kernel/entry64.S

+1 −1

File changed.

Contains only whitespace changes.

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