With the recent rewrite of the arm64 KVM hypervisor code in C, enabling certain options like KASAN would allow the compiler to generate memory accesses or function calls to addresses not mapped at EL2. This patch disables the compiler instrumentation on the arm64 hypervisor code for gcov-based profiling (GCOV_KERNEL), undefined behaviour sanity checker (UBSAN) and kernel address sanitizer (KASAN). Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Christoffer Dall <christoffer.dall@xxxxxxxxxx> Cc: Marc Zyngier <marc.zyngier@xxxxxxx> Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> # 4.5+ --- A better fix, at least for KASAN, would be nice but that's a lot more intrusive as we need to map the KASAN shadow into the EL2 space. In the meantime, especially since it needs backporting to 4.5, this patch would solve KASAN getting stuck with KVM (similar to what we do for EFI_STUB). 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 826032bc3945..acde4782621a 100644 --- a/arch/arm64/kvm/hyp/Makefile +++ b/arch/arm64/kvm/hyp/Makefile @@ -12,3 +12,7 @@ obj-$(CONFIG_KVM_ARM_HOST) += switch.o obj-$(CONFIG_KVM_ARM_HOST) += fpsimd.o obj-$(CONFIG_KVM_ARM_HOST) += tlb.o obj-$(CONFIG_KVM_ARM_HOST) += hyp-entry.o + +GCOV_PROFILE := n +KASAN_SANITIZE := n +UBSAN_SANITIZE := n -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
