linux-kernel - [PATCH 4/5] KVM: Fix asm constraints with CONFIG_FRAME

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Message-Id: <20070111100630.55461250595@il.qumranet.com>
Date:	Thu, 11 Jan 2007 10:06:30 -0000
From:	Avi Kivity <avi@...ranet.com>
To:	kvm-devel@...ts.sourceforge.net
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org, mingo@...e.hu
Subject: [PATCH 4/5] KVM: Fix asm constraints with CONFIG_FRAME_POINTER=n

A "g" constraint may place a local variable in an %rsp-relative memory operand.
but if your assembly changes %rsp, the operand points to the wrong location.

An "r" constraint fixes that.

Thanks to Ingo Molnar for neatly bisecting the problem.

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

Index: linux-2.6/drivers/kvm/vmx.c
===================================================================
--- linux-2.6.orig/drivers/kvm/vmx.c
+++ linux-2.6/drivers/kvm/vmx.c
@@ -1825,7 +1825,7 @@ again:
 #endif
 		"setbe %0 \n\t"
 		"popf \n\t"
-	      : "=g" (fail)
+	      : "=r" (fail)
 	      : "r"(vcpu->launched), "d"((unsigned long)HOST_RSP),
 		"c"(vcpu),
 		[rax]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RAX])),
-
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