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| author | Mark Rutland <mark.rutland@arm.com> | 2016-09-07 11:07:10 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2016-09-12 10:46:07 +0100 |
| commit | e506236a7b8140d73b35fee80f7e38c794dd931d (patch) | |
| tree | 79098881bd7f91c836667c9c66e018d742d5e619 /arch | |
| parent | 6ba3b554f5b9b53cb99c0edb93f0ea855fbc712a (diff) | |
| download | op-kernel-dev-e506236a7b8140d73b35fee80f7e38c794dd931d.zip op-kernel-dev-e506236a7b8140d73b35fee80f7e38c794dd931d.tar.gz | |
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: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/include/asm/kvm_mmu.h | 10 | ||||
| -rw-r--r-- | arch/arm64/kvm/hyp.S | 6 |
2 files changed, 4 insertions, 12 deletions
diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h index b6bb834..dff1098 100644 --- a/arch/arm64/include/asm/kvm_mmu.h +++ b/arch/arm64/include/asm/kvm_mmu.h @@ -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 diff --git a/arch/arm64/kvm/hyp.S b/arch/arm64/kvm/hyp.S index 7ce9315..2726635 100644 --- a/arch/arm64/kvm/hyp.S +++ b/arch/arm64/kvm/hyp.S @@ -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) |
