Debugging crash, panics, stack trace WARN_ONs, etc., from both virtual and
bare-metal boots can get difficult very quickly. While there are ways to
decipher the output and determine if the output is from a virtual guest,
the in-kernel hypervisors now have a single registration point and set
x86_hyper. We can use this to output a single extra line on virtual
machines that indicates the hypervisor type.
Signed-off-by: Prarit Bhargava <prarit@xxxxxxxxxx>
Cc: Avi Kivity <avi@xxxxxxxxxx>
Cc: Gleb Natapov <gleb@xxxxxxxxxx>
Cc: Alex Williamson <alex.williamson@xxxxxxxxxx>
Cc: Marcelo Tostatti <mtosatti@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: kvm@xxxxxxxxxxxxxxx
Cc: x86@xxxxxxxxxx
---
arch/x86/kernel/dumpstack.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index ae42418b..75a635e 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -17,6 +17,7 @@
#include <linux/sysfs.h>
#include <asm/stacktrace.h>
+#include <asm/hypervisor.h>
int panic_on_unrecovered_nmi;
@@ -193,6 +194,8 @@ void dump_stack(void)
init_utsname()->release,
(int)strcspn(init_utsname()->version, " "),
init_utsname()->version);
+ if (x86_hyper && x86_hyper->name)
+ printk("Hypervisor: %s\n", x86_hyper->name);
show_trace(NULL, NULL, &stack, bp);
}
EXPORT_SYMBOL(dump_stack);
--
1.7.9.3
--
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