Drivers: hv: vmbus: Make panic reporting to be more useful

Hyper-V allows the guest to report panic and the guest can pass additional
information. All this is logged on the host. Currently Linux is passing back
information that is not particularly useful. Make the following changes:

1. Windows uses crash MSR P0 to report bugcheck code. Follow the same
convention for Linux as well.
2. It will be useful to know the gust ID of the Linux guest that has
paniced. Pass back this information.

These changes will help in better supporting Linux on Hyper-V
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/x86/hyperv/hv_init.c

@@ -210,9 +210,10 @@ void hyperv_cleanup(void)
 }
 EXPORT_SYMBOL_GPL(hyperv_cleanup);
 
-void hyperv_report_panic(struct pt_regs *regs)
+void hyperv_report_panic(struct pt_regs *regs, long err)
 {
 	static bool panic_reported;
+	u64 guest_id;
 
 	/*
 	 * We prefer to report panic on 'die' chain as we have proper
@@ -223,11 +224,13 @@ void hyperv_report_panic(struct pt_regs *regs)
 		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);
+	rdmsrl(HV_X64_MSR_GUEST_OS_ID, guest_id);
+
+	wrmsrl(HV_X64_MSR_CRASH_P0, err);
+	wrmsrl(HV_X64_MSR_CRASH_P1, guest_id);
+	wrmsrl(HV_X64_MSR_CRASH_P2, regs->ip);
+	wrmsrl(HV_X64_MSR_CRASH_P3, regs->ax);
+	wrmsrl(HV_X64_MSR_CRASH_P4, regs->sp);
 
 	/*
 	 * Let Hyper-V know there is crash data available

arch/x86/include/asm/mshyperv.h

@@ -310,7 +310,7 @@ static inline int hv_cpu_number_to_vp_number(int cpu_number)
 void hyperv_init(void);
 void hyperv_setup_mmu_ops(void);
 void hyper_alloc_mmu(void);
-void hyperv_report_panic(struct pt_regs *regs);
+void hyperv_report_panic(struct pt_regs *regs, long err);
 bool hv_is_hypercall_page_setup(void);
 void hyperv_cleanup(void);
 #else /* CONFIG_HYPERV */

drivers/hv/vmbus_drv.c

@@ -65,7 +65,7 @@ static int hyperv_panic_event(struct notifier_block *nb, unsigned long val,
 
 	regs = current_pt_regs();
 
-	hyperv_report_panic(regs);
+	hyperv_report_panic(regs, val);
 	return NOTIFY_DONE;
 }
 
@@ -75,7 +75,7 @@ static int hyperv_die_event(struct notifier_block *nb, unsigned long val,
 	struct die_args *die = (struct die_args *)args;
 	struct pt_regs *regs = die->regs;
 
-	hyperv_report_panic(regs);
+	hyperv_report_panic(regs, val);
 	return NOTIFY_DONE;
 }