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Message-ID: <20250714073402.4107091-2-ardb+git@google.com> Date: Mon, 14 Jul 2025 09:34:03 +0200 From: Ard Biesheuvel <ardb+git@...gle.com> To: linux-kernel@...r.kernel.org Cc: x86@...nel.org, Ard Biesheuvel <ardb@...nel.org>, Randy Dunlap <rdunlap@...radead.org> Subject: [PATCH] x86/sev: Work around broken noinstr on GCC From: Ard Biesheuvel <ardb@...nel.org> Forcibly disable KCSAN for the sev-nmi.c source file, which only contains functions annotated as 'noinstr' but is emitted with calls to KCSAN instrumentation nonetheless. E.g., vmlinux.o: error: objtool: __sev_es_nmi_complete+0x58: call to __kcsan_check_access() leaves .noinstr.text section make[2]: *** [/usr/local/google/home/ardb/linux/scripts/Makefile.vmlinux_o:72: vmlinux.o] Error 1 Reported-by: Randy Dunlap <rdunlap@...radead.org> Signed-off-by: Ard Biesheuvel <ardb@...nel.org> --- arch/x86/coco/sev/Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/coco/sev/Makefile b/arch/x86/coco/sev/Makefile index db3255b979bd..342d79f0ab6a 100644 --- a/arch/x86/coco/sev/Makefile +++ b/arch/x86/coco/sev/Makefile @@ -5,5 +5,6 @@ obj-y += core.o sev-nmi.o vc-handle.o # Clang 14 and older may fail to respect __no_sanitize_undefined when inlining UBSAN_SANITIZE_sev-nmi.o := n -# GCC may fail to respect __no_sanitize_address when inlining +# GCC may fail to respect __no_sanitize_address or __no_kcsan when inlining KASAN_SANITIZE_sev-nmi.o := n +KCSAN_SANITIZE_sev-nmi.o := n -- 2.50.0.727.gbf7dc18ff4-goog
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