From mboxrd@z Thu Jan  1 00:00:00 1970
From: Arun Sharma <arun.sharma@intel.com>
Subject: [PATCH] Use hypercalls instead of accessing debug
	registers directly.
Date: Thu, 7 Jul 2005 14:50:23 -0700
Message-ID: <20050707215023.GA30422@intel.com>
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To: Ian Pratt <Ian.Pratt@cl.cam.ac.uk>, Keir Fraser <Keir.Fraser@cl.cam.ac.uk>
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Use hypercalls instead of accessing debug registers directly.

Signed-off-by: Jun Nakajima <jun.nakajima@intel.com>
Signed-off-by: Arun Sharma <arun.sharma@intel.com>

--- a/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/traps.c	Wed Jul  6 23:44:28 2005
+++ b/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/traps.c	Thu Jul  7 14:38:19 2005
@@ -666,7 +666,7 @@
        }
 #endif
 
-	asm("movq %%db6,%0" : "=r" (condition));
+	condition = HYPERVISOR_get_debugreg(6);
 
 	if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code,
 						SIGTRAP) == NOTIFY_STOP) {
@@ -714,7 +714,8 @@
 	info.si_addr = (void __user *)regs->rip;
 	force_sig_info(SIGTRAP, &info, tsk);	
 clear_dr7:
-	asm volatile("movq %0,%%db7"::"r"(0UL));
+	HYPERVISOR_set_debugreg(7, 0);
+
 	notify_die(DIE_DEBUG, "debug", regs, condition, 1, SIGTRAP);
 	return regs;