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authorK. Y. Srinivasan <kys@microsoft.com>2017-01-19 11:51:48 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-20 14:48:03 +0100
commitd058fa7e98ff01a4b4750a2210fc19906db3cbe1 (patch)
tree2050b48f9bcbcbf3df9526e02afbbee45d53ab22 /arch/x86/hyperv
parent8de8af7e0873c4fdac2205327dff922819e16657 (diff)
downloadlinux-d058fa7e98ff01a4b4750a2210fc19906db3cbe1.tar.bz2
Drivers: hv: vmbus: Move the crash notification function
As part of the effort to separate out architecture specific code, move the crash notification function. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86/hyperv')
-rw-r--r--arch/x86/hyperv/hv_init.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 860233af4568..ce5fc7394814 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -209,3 +209,29 @@ u64 hv_do_hypercall(u64 control, void *input, void *output)
#endif /* !x86_64 */
}
EXPORT_SYMBOL_GPL(hv_do_hypercall);
+
+void hyperv_report_panic(struct pt_regs *regs)
+{
+ static bool panic_reported;
+
+ /*
+ * We prefer to report panic on 'die' chain as we have proper
+ * registers to report, but if we miss it (e.g. on BUG()) we need
+ * to report it on 'panic'.
+ */
+ if (panic_reported)
+ return;
+ panic_reported = true;
+
+ wrmsrl(HV_X64_MSR_CRASH_P0, regs->ip);
+ wrmsrl(HV_X64_MSR_CRASH_P1, regs->ax);
+ wrmsrl(HV_X64_MSR_CRASH_P2, regs->bx);
+ wrmsrl(HV_X64_MSR_CRASH_P3, regs->cx);
+ wrmsrl(HV_X64_MSR_CRASH_P4, regs->dx);
+
+ /*
+ * Let Hyper-V know there is crash data available
+ */
+ wrmsrl(HV_X64_MSR_CRASH_CTL, HV_CRASH_CTL_CRASH_NOTIFY);
+}
+EXPORT_SYMBOL_GPL(hyperv_report_panic);