linux-kernel - [PATCH] KVM: Fix asm constraints for segment loads

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Date:	Sun, 12 Nov 2006 14:02:43 -0000
From:	Avi Kivity <avi@...ranet.com>
To:	kvm-devel@...ts.sourceforge.net
Cc:	akpm@...l.org, linux-kernel@...r.kernel.org, bero@...linux.org
Subject: [PATCH] KVM: Fix asm constraints for segment loads

From: Bernhard Rosenkraenzer <bero@...linux.org>

"g" is an invalid constraint for a segment register load, since it includes
immediate operands, which are illegal for segment moves.

Fix by specifying register or memory operands.

Signed-off-by: Avi Kivity <avi@...ranet.com>

Index: linux-2.6/drivers/kvm/kvm_main.c
===================================================================
--- linux-2.6.orig/drivers/kvm/kvm_main.c
+++ linux-2.6/drivers/kvm/kvm_main.c
@@ -154,12 +154,12 @@ static u16 read_ldt(void)
 
 static void load_fs(u16 sel)
 {
-	asm ("mov %0, %%fs" : : "g"(sel));
+	asm ("mov %0, %%fs" : : "rm"(sel));
 }
 
 static void load_gs(u16 sel)
 {
-	asm ("mov %0, %%gs" : : "g"(sel));
+	asm ("mov %0, %%gs" : : "rm"(sel));
 }
 
 #ifndef load_ldt
-
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