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[Xen-devel] [PATCH] Use hypercalls instead of accessing debug registers

from [Arun Sharma]

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To:	Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>, Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Subject:	[Xen-devel] [PATCH] Use hypercalls instead of accessing debug registers directly.
From:	Arun Sharma <arun.sharma@xxxxxxxxx>
Date:	Thu, 7 Jul 2005 14:50:23 -0700
Cc:	xen-devel@xxxxxxxxxxxxxxxxxxx
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Use hypercalls instead of accessing debug registers directly.

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

--- 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;
 

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