void xen_unplug_emulated_devices(void)
{
int r;
if (xen_emul_unplug & XEN_UNPLUG_NEVER)
return;
r = check_platform_magic();
if (r && !(r == XEN_PLATFORM_ERR_MAGIC &&
(xen_emul_unplug & XEN_UNPLUG_UNNECESSARY)))
return;
if (!xen_emul_unplug) {
if (xen_must_unplug_nics()) {
printk(KERN_INFO "Netfront and the Xen platform PCI driver have "
"been compiled for this kernel: unplug emulated NICs.\n");
xen_emul_unplug |= XEN_UNPLUG_ALL_NICS;
}
if (xen_must_unplug_disks()) {
printk(KERN_INFO "Blkfront and the Xen platform PCI driver have "
"been compiled for this kernel: unplug emulated disks.\n"
"You might have to change the root device\n"
"from /dev/hd[a-d] to /dev/xvd[a-d]\n"
"in your root= kernel command line option\n");
xen_emul_unplug |= XEN_UNPLUG_ALL_IDE_DISKS;
}
}
if (!(xen_emul_unplug & XEN_UNPLUG_UNNECESSARY))
outw(xen_emul_unplug, XEN_IOPORT_UNPLUG);
xen_platform_pci_unplug = xen_emul_unplug;
}
void xen_unplug_emulated_devices(void)
{
int r;
/* not valid unless in HVM case or sysadmin explicit told not to unplug */
if (xen_emul_unplug & XEN_UNPLUG_NEVER)
return;
/* check the version of the xen platform PCI device */
r = check_platform_magic();
/* If the version matches enable the Xen platform PCI driver.
* Also enable the Xen platform PCI driver if the host does
* not support the unplug protocol (XEN_PLATFORM_ERR_MAGIC)
* but the user told us that unplugging is unnecessary, i.e.,
* the user has set the disk spec to vbd & vif spec to type=netfront */
if (r && !(r == XEN_PLATFORM_ERR_MAGIC &&
(xen_emul_unplug & XEN_UNPLUG_UNNECESSARY)))
return;
/* 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). */
if (!xen_emul_unplug) {
if (xen_must_unplug_nics()) {
printk(KERN_INFO "Netfront and the Xen platform PCI driver have "
"been compiled for this kernel: unplug emulated NICs.\n");
xen_emul_unplug |= XEN_UNPLUG_ALL_NICS;
}
if (xen_must_unplug_disks()) {
printk(KERN_INFO "Blkfront and the Xen platform PCI driver have "
"been compiled for this kernel: unplug emulated disks.\n"
"You might have to change the root device\n"
"from /dev/hd[a-d] to /dev/xvd[a-d]\n"
"in your root= kernel command line option\n");
xen_emul_unplug |= XEN_UNPLUG_ALL_IDE_DISKS;
}
}
/* Now unplug the emulated devices */
if (!(xen_emul_unplug & XEN_UNPLUG_UNNECESSARY))
outw(xen_emul_unplug, XEN_IOPORT_UNPLUG);
else
xen_ide_unplug_unsupported = 0;
if (xen_emul_unplug & XEN_UNPLUG_ALL_IDE_DISKS)
xen_ide_unplug_unsupported = 0;
xen_platform_pci_unplug = xen_emul_unplug;
}
