Messages in this thread Patch in this message |  | | Date | Tue, 7 Jan 2025 16:18:27 +0100 | | Subject | [PATCH] x86/sev: Disable ftrace branch profiling in SEV startup code | | From | Ard Biesheuvel <> |
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From: Ard Biesheuvel <ardb@kernel.org>
Ftrace branch profiling inserts absolute references to its metadata at call sites, and this implies that this kind of instrumentation cannot be used while executing from the 1:1 mapping of memory.
Therefore, disable ftrace branch profiling in the SEV startup routines, by disabling it for the entire SEV core source file.
Cc: Tom Lendacky <thomas.lendacky@amd.com> Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202501072244.zZrx9864-lkp@intel.com/ Signed-off-by: Ard Biesheuvel <ardb@kernel.org> --- arch/x86/coco/sev/core.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/x86/coco/sev/core.c b/arch/x86/coco/sev/core.c index 86898547056e..b5c6c4afd1cc 100644 --- a/arch/x86/coco/sev/core.c +++ b/arch/x86/coco/sev/core.c @@ -9,6 +9,8 @@ #define pr_fmt(fmt) "SEV: " fmt +#define DISABLE_BRANCH_PROFILING + #include <linux/sched/debug.h> /* For show_regs() */ #include <linux/percpu-defs.h> #include <linux/cc_platform.h> -- 2.47.1.613.gc27f4b7a9f-goog
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