Re: [PATCH v5 13/14] arm64: disable SCS for hypervisor code
From: Mark Rutland <mark.rutland@arm.com>
Date: 2019-11-15 14:46:14
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On Tue, Nov 05, 2019 at 03:56:07PM -0800, Sami Tolvanen wrote:
Filter out CC_FLAGS_SCS for code that runs at a different exception level. Suggested-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Kees Cook <redacted>
Looks sound, and objdump confirms that the hyp objects are using x29's frame record, without using x18. Reviewed-by: Mark Rutland <mark.rutland@arm.com> Mark.
quoted hunk ↗ jump to hunk
--- arch/arm64/kvm/hyp/Makefile | 3 +++ 1 file changed, 3 insertions(+)diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile index ea710f674cb6..17ea3da325e9 100644 --- a/arch/arm64/kvm/hyp/Makefile +++ b/arch/arm64/kvm/hyp/Makefile@@ -28,3 +28,6 @@ GCOV_PROFILE := n KASAN_SANITIZE := n UBSAN_SANITIZE := n KCOV_INSTRUMENT := n + +# remove the SCS flags from all objects in this directory +KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_SCS), $(KBUILD_CFLAGS))-- 2.24.0.rc1.363.gb1bccd3e3d-goog
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