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x86: Unplug emulated disks and nics.

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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>
This commit is contained in:
Stefano Stabellini
2010-05-14 12:44:30 +01:00
committed by Jeremy Fitzhardinge
parent 409771d258
commit c1c5413ad5
9 changed files with 225 additions and 1 deletions
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6
drivers/xen/platform-pci.c
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@@ -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);
}