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>
diff --git a/drivers/xen/platform-pci.c b/drivers/xen/platform-pci.c
index bdb44f2..c01b5dd 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 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);
}