From: Trammell Hudson <thudson@newskysaw.eecs.northwestern.edu>
Date: Wed, 22 Oct 2008 00:53:58 +0000 (-0500)
Subject: Detect recursive page faults and halt
X-Git-Tag: 1.0^2~28
X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?p=palacios-OLD.git;a=commitdiff_plain;h=6412a23da90ae75906e946febb6f49df8a33d0bd

Detect recursive page faults and halt
---

diff --git a/kitten/arch/x86_64/kernel/interrupts.c b/kitten/arch/x86_64/kernel/interrupts.c
index 7441829..19ba726 100644
--- a/kitten/arch/x86_64/kernel/interrupts.c
+++ b/kitten/arch/x86_64/kernel/interrupts.c
@@ -136,7 +136,12 @@ do_general_protection(struct pt_regs *regs, unsigned int vector)
 void
 do_page_fault(struct pt_regs *regs, unsigned int vector)
 {
-	printk("Page Fault Exception\n");
+	printk("Page Fault Exception (regs %p)\n", regs );
+
+	static uint8_t recursive_fault;
+	if( recursive_fault++ )
+		panic( "Recursive page fault!  Halt and catch fire!" );
+
 	show_registers(regs);
 	while (1) {}
 }