BackPup/Linux
1
0 Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-10-07 05:31:08 -04:00
Code Issues Packages Projects Releases Wiki Activity

arm64: log CPU boot modes

Browse Source 
We currently don't log the boot mode for arm64 as we do for arm, and
without KVM the user is provided with no indication as to which mode(s)
CPUs were booted in, which can seriously hinder debugging in some cases.

Add logging to the boot path once all CPUs are up. Where CPUs are
mismatched in violation of the boot protocol, WARN and set a taint (as
we do for CPU other CPU feature mismatches) given that the
firmware/bootloader is buggy and should be fixed.

Cc: Catalin Marinas <[email protected]>
Cc: Marc Zyngier <[email protected]>
Tested-by: Ard Biesheuvel <[email protected]>
Reviewed-by: Ard Biesheuvel <[email protected]>
Signed-off-by: Mark Rutland <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
This commit is contained in:
Mark Rutland authored and Will Deacon committed 2015-03-17 16:59:15 +00:00
1 parent 424a383824
commit 667f3fd395
1 file changed
+13
Download Patch File Download Diff File Expand all files Collapse all files
arch/arm64/kernel/setup.c
+13
View File
@@ -62,6 +62,7 @@
#include <asm/memblock.h>
#include <asm/psci.h>
#include <asm/efi.h>
#include <asm/virt.h>
unsigned int processor_id;
EXPORT_SYMBOL(processor_id);
@@ -207,8 +208,20 @@ static void __init smp_build_mpidr_hash(void)
}
#endif
static void __init hyp_mode_check(void)
{
if (is_hyp_mode_available())
pr_info("CPU: All CPU(s) started at EL2\n");
else if (is_hyp_mode_mismatched())
WARN_TAINT(1, TAINT_CPU_OUT_OF_SPEC,
"CPU: CPUs started in inconsistent modes");
else
pr_info("CPU: All CPU(s) started at EL1\n");
}
void __init do_post_cpus_up_work(void)
{
hyp_mode_check();
apply_alternatives_all();
}