From c1c5413ad58cb73267d328e6020268aa2e50d8ca Mon Sep 17 00:00:00 2001
From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Date: Fri, 14 May 2010 12:44:30 +0100
Subject: x86: Unplug emulated disks and nics.

Add a xen_emul_unplug command line option to the kernel to unplug
xen emulated disks and nics.

Set the default value of xen_emul_unplug depending on whether or
not the Xen PV frontends and the Xen platform PCI driver have
been compiled for this kernel (modules or built-in are both OK).

The user can specify xen_emul_unplug=ignore to enable PV drivers on HVM
even if the host platform doesn't support unplug.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
---
 drivers/xen/platform-pci.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'drivers/xen/platform-pci.c')

diff --git a/drivers/xen/platform-pci.c b/drivers/xen/platform-pci.c
index bdb44f2473e8..c01b5ddce529 100644
--- a/drivers/xen/platform-pci.c
+++ b/drivers/xen/platform-pci.c
@@ -27,6 +27,7 @@
 #include <linux/module.h>
 #include <linux/pci.h>
 
+#include <xen/platform_pci.h>
 #include <xen/grant_table.h>
 #include <xen/xenbus.h>
 #include <xen/events.h>
@@ -195,6 +196,11 @@ static struct pci_driver platform_driver = {
 
 static int __init platform_pci_module_init(void)
 {
+	/* no unplug has been done, IGNORE hasn't been specified: just
+	 * return now */
+	if (!xen_platform_pci_unplug)
+		return -ENODEV;
+
 	return pci_register_driver(&platform_driver);
 }
 
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