1 files changed, 30 insertions, 0 deletions

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 82ed403147c0..f63ac3d1f8a4 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -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 +738,35 @@ static int blkfront_probe(struct xenbus_device *dev,
                 }
         }
 
+        if (xen_hvm_domain()) {
+                char *type;
+                int len;
+                /* no unplug has been done: do not hook devices != xen vbds */
+                if (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;
+                        }
+                }
+                /* do not create a PV cdrom device if we are an HVM guest */
+                type = xenbus_read(XBT_NIL, dev->nodename, "device-type", &len);
+                if (IS_ERR(type))
+                        return -ENODEV;
+                if (strncmp(type, "cdrom", 5) == 0) {
+                        kfree(type);
+                        return -ENODEV;
+                }
+                kfree(type);
+        }
         info = kzalloc(sizeof(*info), GFP_KERNEL);
         if (!info) {
                 xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure");