Commit cf4ca806 authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Borislav Petkov (AMD)
Browse files

x86/sev: Disable ftrace branch profiling in SEV startup code 

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.

Closes: https://lore.kernel.org/oe-kbuild-all/202501072244.zZrx9864-lkp@intel.com/


Reported-by: default avatarkernel test robot <lkp@intel.com>
Signed-off-by: default avatarArd Biesheuvel <ardb@kernel.org>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Acked-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
Link: https://lore.kernel.org/r/20250107151826.820147-2-ardb+git@google.com
parent 7c61a3d8

arch/x86/coco/sev/core.c

+2 −0
Original line number Diff line number Diff line
@@ -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>