[PATCH v2 06/18] arm64: kvm: use -fno-jump-tables with clang

Sami Tolvanen
2017-11-15T21:34:52Z

Use -fno-jump-tables to make sure clang doesn't generate branches
to EL1 virtual addresses.

Suggested-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
---
arch/arm64/kvm/hyp/Makefile | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile
index f04400d494b7..19fa1c6b6b69 100644
--- a/arch/arm64/kvm/hyp/Makefile
+++ b/arch/arm64/kvm/hyp/Makefile
@@ -5,6 +5,10 @@

ccflags-y += -fno-stack-protector -DDISABLE_BRANCH_PROFILING

+ifeq ($(cc-name),clang)
+ccflags-y += -fno-jump-tables
+endif
+
KVM=../../../../virt/kvm

obj-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/hyp/vgic-v2-sr.o
--
2.15.0.448.gf294e3d99a-goog