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

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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: kernel test robot <lkp@intel.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Link: https://lore.kernel.org/r/20250107151826.820147-2-ardb+git@google.com
This commit is contained in:
Ard Biesheuvel 2025-01-07 16:18:27 +01:00 • committed by Borislav Petkov (AMD)
parent 7c61a3d8f7
commit cf4ca80650
1 changed files with 2 additions and 0 deletions
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2
arch/x86/coco/sev/core.c
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@ -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>