From c1c5413ad58cb73267d328e6020268aa2e50d8ca Mon Sep 17 00:00:00 2001 From: Stefano Stabellini 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 Signed-off-by: Jeremy Fitzhardinge --- drivers/xen/platform-pci.c | 6 ++++++ drivers/xen/xenbus/xenbus_probe.c | 4 ++++ 2 files changed, 10 insertions(+) (limited to 'drivers/xen') 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 #include +#include #include #include #include @@ -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); } diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c index a9e83c438cbb..37e8894b50d6 100644 --- a/drivers/xen/xenbus/xenbus_probe.c +++ b/drivers/xen/xenbus/xenbus_probe.c @@ -56,6 +56,7 @@ #include #include +#include #include #include "xenbus_comms.h" @@ -977,6 +978,9 @@ static void wait_for_devices(struct xenbus_driver *xendrv) #ifndef MODULE static int __init boot_wait_for_devices(void) { + if (xen_hvm_domain() && !xen_platform_pci_unplug) + return -ENODEV; + ready_to_wait_for_devices = 1; wait_for_devices(NULL); return 0; -- cgit v1.2.3