Commit e506236a authored by Mark Rutland's avatar Mark Rutland Committed by Will Deacon
Browse files

arm64/kvm: use alternative auto-nop 



Make use of the new alternative_if and alternative_else_nop_endif and
get rid of our open-coded NOP sleds, making the code simpler to read.

Note that for __kvm_call_hyp the branch to __vhe_hyp_call has been moved
out of the alternative sequence, and in the default case there will be
four additional NOPs executed.

Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: kvmarm@lists.cs.columbia.edu
Acked-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: default avatarMark Rutland <mark.rutland@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 6ba3b554

arch/arm64/include/asm/kvm_mmu.h

+3 −7
Original line number Diff line number Diff line
@@ -99,14 +99,10 @@ 
.macro kern_hyp_va	reg

alternative_if_not ARM64_HAS_VIRT_HOST_EXTN

	and     \reg, \reg, #HYP_PAGE_OFFSET_HIGH_MASK

alternative_else

	nop

alternative_endif

alternative_if_not ARM64_HYP_OFFSET_LOW

	nop

alternative_else

alternative_else_nop_endif

alternative_if ARM64_HYP_OFFSET_LOW

	and     \reg, \reg, #HYP_PAGE_OFFSET_LOW_MASK

alternative_endif

alternative_else_nop_endif

.endm



#else

arch/arm64/kvm/hyp.S

+1 −5
Original line number Diff line number Diff line
@@ -46,10 +46,6 @@ alternative_if_not ARM64_HAS_VIRT_HOST_EXTN 
	hvc	#0

	ldr     lr, [sp], #16

	ret

alternative_else

alternative_else_nop_endif

	b	__vhe_hyp_call

	nop

	nop

	nop

alternative_endif

ENDPROC(__kvm_call_hyp)

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