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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 <[email protected]>
Signed-off-by: Jeremy Fitzhardinge <[email protected]>
This commit is contained in:
Stefano Stabellini 2010-05-14 12:44:30 +01:00 • committed by Jeremy Fitzhardinge
commit c1c5413ad5
9 changed files with 225 additions and 1 deletions
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17
drivers/block/xen-blkfront.c
View file

@ -48,6 +48,7 @@
#include <xen/grant_table.h>
#include <xen/events.h>
#include <xen/page.h>
#include <xen/platform_pci.h>
#include <xen/interface/grant_table.h>
#include <xen/interface/io/blkif.h>
@ -737,6 +738,22 @@ static int blkfront_probe(struct xenbus_device *dev,
}
}
/* no unplug has been done: do not hook devices != xen vbds */
if (xen_hvm_domain() && (xen_platform_pci_unplug & XEN_UNPLUG_IGNORE)) {
int major;
if (!VDEV_IS_EXTENDED(vdevice))
major = BLKIF_MAJOR(vdevice);
else
major = XENVBD_MAJOR;
if (major != XENVBD_MAJOR) {
printk(KERN_INFO
"%s: HVM does not support vbd %d as xen block device\n",
__FUNCTION__, vdevice);
return -ENODEV;
}
}
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info) {
xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure");