From: Borislav Petkov bp@suse.de
[ Upstream commit e100777016fdf6ec3a9d7c1773b15a2b5eca6c55 ]
They do get called from the #MC handler which is already marked "noinstr".
Commit
e2def7d49d08 ("x86/mce: Make mce_rdmsrl() panic on an inaccessible MSR")
already got rid of the instrumentation in the MSR accessors, fix the annotation now too, in order to get rid of:
vmlinux.o: warning: objtool: do_machine_check()+0x4a: call to mce_rdmsrl() leaves .noinstr.text section
Signed-off-by: Borislav Petkov bp@suse.de Link: https://lkml.kernel.org/r/20200915194020.28807-1-bp@alien8.de Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/kernel/cpu/mce/core.c | 27 +++++++++++++++++++++------ 1 file changed, 21 insertions(+), 6 deletions(-)
diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c index fc4f8c04bdb56..4288645425f15 100644 --- a/arch/x86/kernel/cpu/mce/core.c +++ b/arch/x86/kernel/cpu/mce/core.c @@ -374,16 +374,25 @@ static int msr_to_offset(u32 msr) }
/* MSR access wrappers used for error injection */ -static u64 mce_rdmsrl(u32 msr) +static noinstr u64 mce_rdmsrl(u32 msr) { u64 v;
if (__this_cpu_read(injectm.finished)) { - int offset = msr_to_offset(msr); + int offset; + u64 ret;
+ instrumentation_begin(); + + offset = msr_to_offset(msr); if (offset < 0) - return 0; - return *(u64 *)((char *)this_cpu_ptr(&injectm) + offset); + ret = 0; + else + ret = *(u64 *)((char *)this_cpu_ptr(&injectm) + offset); + + instrumentation_end(); + + return ret; }
if (rdmsrl_safe(msr, &v)) { @@ -399,13 +408,19 @@ static u64 mce_rdmsrl(u32 msr) return v; }
-static void mce_wrmsrl(u32 msr, u64 v) +static noinstr void mce_wrmsrl(u32 msr, u64 v) { if (__this_cpu_read(injectm.finished)) { - int offset = msr_to_offset(msr); + int offset;
+ instrumentation_begin(); + + offset = msr_to_offset(msr); if (offset >= 0) *(u64 *)((char *)this_cpu_ptr(&injectm) + offset) = v; + + instrumentation_end(); + return; } wrmsrl(msr, v);