[PATCH v2 06/18] arm64: kvm: use -fno-jump-tables with clang
From: samitolvanen@google.com (Sami Tolvanen)
Date: 2017-11-15 21:35:33
Also in:
linux-kbuild, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
Use -fno-jump-tables to make sure clang doesn't generate branches to EL1 virtual addresses. Suggested-by: AKASHI Takahiro <redacted> 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