linux-kernel - [PATCH 21 of 31] xen: make sure iret faults are trapped

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Date:	Mon, 17 Mar 2008 16:37:12 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ian Campbell <ijc@...lion.org.uk>
Subject: [PATCH 21 of 31] xen: make sure iret faults are trapped

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 arch/x86/kernel/entry_32.S |    2 +-
 arch/x86/xen/xen-asm.S     |    6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -411,7 +411,7 @@
 irq_return:
 	INTERRUPT_RETURN
 .section .fixup,"ax"
-iret_exc:
+ENTRY(iret_exc)
 	pushl $0			# no error code
 	pushl $do_iret_error
 	jmp error_code
diff --git a/arch/x86/xen/xen-asm.S b/arch/x86/xen/xen-asm.S
--- a/arch/x86/xen/xen-asm.S
+++ b/arch/x86/xen/xen-asm.S
@@ -184,8 +184,12 @@
 	   region is OK. */
 	je xen_hypervisor_callback
 
-	iret
+1:	iret
 xen_iret_end_crit:
+.section __ex_table,"a"
+	.align 4
+	.long 1b,iret_exc
+.previous
 
 hyper_iret:
 	/* put this out of line since its very rarely used */


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