From: ddugger@redhat.com <ddugger@redhat.com>
Date: Mon, 23 Mar 2009 10:23:37 -0600
Subject: [xen] add hypercall for adding and removing PCI devices
Message-id: 200903231623.n2NGNbB0022161@sobek.n0ano.com
O-Subject: [RHEL5.4 PATCH 21/21 V2] xen: add hypercall for adding and removing PCI devices
Bugzilla: 484227
RH-Acked-by: Gerd Hoffmann <kraxel@redhat.com>

The add hypercall will add a new PCI device and register it.  The
remove hypercall will remove the pci_dev strucure for the device.

diff --git a/arch/x86/physdev.c b/arch/x86/physdev.c
index 88cc9dd..7872e82 100644
--- a/arch/x86/physdev.c
+++ b/arch/x86/physdev.c
@@ -342,6 +342,32 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_HANDLE(void) arg)
         break;
     }
 
+    case PHYSDEVOP_manage_pci_add: {
+        struct physdev_manage_pci manage_pci;
+        ret = -EPERM;
+        if ( !IS_PRIV(current->domain) )
+            break;
+        ret = -EFAULT;
+        if ( copy_from_guest(&manage_pci, arg, 1) != 0 )
+            break;
+
+        ret = pci_add_device(manage_pci.bus, manage_pci.devfn);
+        break;
+    }
+
+    case PHYSDEVOP_manage_pci_remove: {
+        struct physdev_manage_pci manage_pci;
+        ret = -EPERM;
+        if ( !IS_PRIV(current->domain) )
+            break;
+        ret = -EFAULT;
+        if ( copy_from_guest(&manage_pci, arg, 1) != 0 )
+            break;
+
+        ret = pci_remove_device(manage_pci.bus, manage_pci.devfn);
+        break;
+    }
+
     default:
         ret = -ENOSYS;
         break;
diff --git a/include/public/physdev.h b/include/public/physdev.h
index a710907..c27644e 100644
--- a/include/public/physdev.h
+++ b/include/public/physdev.h
@@ -153,6 +153,17 @@ struct physdev_unmap_pirq {
 typedef struct physdev_unmap_pirq physdev_unmap_pirq_t;
 DEFINE_XEN_GUEST_HANDLE(physdev_unmap_pirq_t);
 
+#define PHYSDEVOP_manage_pci_add         15
+#define PHYSDEVOP_manage_pci_remove      16
+struct physdev_manage_pci {
+    /* IN */
+    uint8_t bus;
+    uint8_t devfn;
+};
+
+typedef struct physdev_manage_pci physdev_manage_pci_t;
+DEFINE_XEN_GUEST_HANDLE(physdev_manage_pci_t);
+
 /*
  * Argument to physdev_op_compat() hypercall. Superceded by new physdev_op()
  * hypercall since 0x00030202.