ARM: virt: Add boot-time diagnostics
In order to easily detect pathological cases, print some diagnostics
when the kernel boots.
This also provides helpers to detect that HYP mode is actually available,
which can be used by other subsystems to enable HYP specific features.
Signed-off-by: Dave Martin <dave.martin@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index a81dcec..04fd01f 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -55,6 +55,7 @@
#include <asm/traps.h>
#include <asm/unwind.h>
#include <asm/memblock.h>
+#include <asm/virt.h>
#if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
#include "compat.h"
@@ -937,6 +938,21 @@
return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
}
+void __init hyp_mode_check(void)
+{
+#ifdef CONFIG_ARM_VIRT_EXT
+ if (is_hyp_mode_available()) {
+ pr_info("CPU: All CPU(s) started in HYP mode.\n");
+ pr_info("CPU: Virtualization extensions available.\n");
+ } else if (is_hyp_mode_mismatched()) {
+ pr_warn("CPU: WARNING: CPU(s) started in wrong/inconsistent modes (primary CPU mode 0x%x)\n",
+ __boot_cpu_mode & MODE_MASK);
+ pr_warn("CPU: This may indicate a broken bootloader or firmware.\n");
+ } else
+ pr_info("CPU: All CPU(s) started in SVC mode.\n");
+#endif
+}
+
void __init setup_arch(char **cmdline_p)
{
struct machine_desc *mdesc;
@@ -980,6 +996,10 @@
if (is_smp())
smp_init_cpus();
#endif
+
+ if (!is_smp())
+ hyp_mode_check();
+
reserve_crashkernel();
tcm_init();