Merge remote-tracking branch 'remotes/sstabellini/tags/xen-20161028-tag' into staging

Xen 2016/10/28

# gpg: Signature made Sat 29 Oct 2016 02:03:42 BST
# gpg:                using RSA key 0x894F8F4870E1AE90
# gpg: Good signature from "Stefano Stabellini <sstabellini@kernel.org>"
# gpg:                 aka "Stefano Stabellini <stefano.stabellini@eu.citrix.com>"
# Primary key fingerprint: D04E 33AB A51F 67BA 07D3  0AEA 894F 8F48 70E1 AE90

* remotes/sstabellini/tags/xen-20161028-tag:
  xen: Rename xen_be_del_xendev
  xen: Rename xen_be_find_xendev
  xen: Rename xen_be_evtchn_event
  xen: Rename xen_be_send_notify
  xen: Rename xen_be_unbind_evtchn
  xen: Rename xen_be_printf to xen_pv_printf
  xen: Move xenstore cleanup and mkdir functions
  xen: Prepare xendev qtail to be shared with frontends
  xen: Move evtchn functions to xen_pvdev.c
  xen: Move xenstore_update to xen_pvdev.c
  xen: Create a new file xen_pvdev.c
  xen: Fix coding style warnings
  xen: Fix coding style errors

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

9 files changed, 517 insertions, 457 deletions

diff --git a/hw/block/xen_disk.c b/hw/block/xen_disk.c
index 1292a4b..3a7dc19 100644
--- a/hw/block/xen_disk.c
+++ b/hw/block/xen_disk.c
@@ -167,12 +167,12 @@ static void destroy_grant(gpointer pgnt)
     xengnttab_handle *gnt = grant->blkdev->xendev.gnttabdev;
 
     if (xengnttab_unmap(gnt, grant->page, 1) != 0) {
-        xen_be_printf(&grant->blkdev->xendev, 0,
+        xen_pv_printf(&grant->blkdev->xendev, 0,
                       "xengnttab_unmap failed: %s\n",
                       strerror(errno));
     }
     grant->blkdev->persistent_gnt_count--;
-    xen_be_printf(&grant->blkdev->xendev, 3,
+    xen_pv_printf(&grant->blkdev->xendev, 3,
                   "unmapped grant %p\n", grant->page);
     g_free(grant);
 }
@@ -184,11 +184,11 @@ static void remove_persistent_region(gpointer data, gpointer dev)
     xengnttab_handle *gnt = blkdev->xendev.gnttabdev;
 
     if (xengnttab_unmap(gnt, region->addr, region->num) != 0) {
-        xen_be_printf(&blkdev->xendev, 0,
+        xen_pv_printf(&blkdev->xendev, 0,
                       "xengnttab_unmap region %p failed: %s\n",
                       region->addr, strerror(errno));
     }
-    xen_be_printf(&blkdev->xendev, 3,
+    xen_pv_printf(&blkdev->xendev, 3,
                   "unmapped grant region %p with %d pages\n",
                   region->addr, region->num);
     g_free(region);
@@ -255,7 +255,7 @@ static int ioreq_parse(struct ioreq *ioreq)
     size_t len;
     int i;
 
-    xen_be_printf(&blkdev->xendev, 3,
+    xen_pv_printf(&blkdev->xendev, 3,
                   "op %d, nr %d, handle %d, id %" PRId64 ", sector %" PRId64 "\n",
                   ioreq->req.operation, ioreq->req.nr_segments,
                   ioreq->req.handle, ioreq->req.id, ioreq->req.sector_number);
@@ -275,28 +275,28 @@ static int ioreq_parse(struct ioreq *ioreq)
     case BLKIF_OP_DISCARD:
         return 0;
     default:
-        xen_be_printf(&blkdev->xendev, 0, "error: unknown operation (%d)\n",
+        xen_pv_printf(&blkdev->xendev, 0, "error: unknown operation (%d)\n",
                       ioreq->req.operation);
         goto err;
     };
 
     if (ioreq->req.operation != BLKIF_OP_READ && blkdev->mode[0] != 'w') {
-        xen_be_printf(&blkdev->xendev, 0, "error: write req for ro device\n");
+        xen_pv_printf(&blkdev->xendev, 0, "error: write req for ro device\n");
         goto err;
     }
 
     ioreq->start = ioreq->req.sector_number * blkdev->file_blk;
     for (i = 0; i < ioreq->req.nr_segments; i++) {
         if (i == BLKIF_MAX_SEGMENTS_PER_REQUEST) {
-            xen_be_printf(&blkdev->xendev, 0, "error: nr_segments too big\n");
+            xen_pv_printf(&blkdev->xendev, 0, "error: nr_segments too big\n");
             goto err;
         }
         if (ioreq->req.seg[i].first_sect > ioreq->req.seg[i].last_sect) {
-            xen_be_printf(&blkdev->xendev, 0, "error: first > last sector\n");
+            xen_pv_printf(&blkdev->xendev, 0, "error: first > last sector\n");
             goto err;
         }
         if (ioreq->req.seg[i].last_sect * BLOCK_SIZE >= XC_PAGE_SIZE) {
-            xen_be_printf(&blkdev->xendev, 0, "error: page crossing\n");
+            xen_pv_printf(&blkdev->xendev, 0, "error: page crossing\n");
             goto err;
         }
 
@@ -308,7 +308,7 @@ static int ioreq_parse(struct ioreq *ioreq)
         qemu_iovec_add(&ioreq->v, (void*)mem, len);
     }
     if (ioreq->start + ioreq->v.size > blkdev->file_size) {
-        xen_be_printf(&blkdev->xendev, 0, "error: access beyond end of file\n");
+        xen_pv_printf(&blkdev->xendev, 0, "error: access beyond end of file\n");
         goto err;
     }
     return 0;
@@ -331,7 +331,7 @@ static void ioreq_unmap(struct ioreq *ioreq)
             return;
         }
         if (xengnttab_unmap(gnt, ioreq->pages, ioreq->num_unmap) != 0) {
-            xen_be_printf(&ioreq->blkdev->xendev, 0,
+            xen_pv_printf(&ioreq->blkdev->xendev, 0,
                           "xengnttab_unmap failed: %s\n",
                           strerror(errno));
         }
@@ -343,7 +343,7 @@ static void ioreq_unmap(struct ioreq *ioreq)
                 continue;
             }
             if (xengnttab_unmap(gnt, ioreq->page[i], 1) != 0) {
-                xen_be_printf(&ioreq->blkdev->xendev, 0,
+                xen_pv_printf(&ioreq->blkdev->xendev, 0,
                               "xengnttab_unmap failed: %s\n",
                               strerror(errno));
             }
@@ -381,7 +381,7 @@ static int ioreq_map(struct ioreq *ioreq)
 
             if (grant != NULL) {
                 page[i] = grant->page;
-                xen_be_printf(&ioreq->blkdev->xendev, 3,
+                xen_pv_printf(&ioreq->blkdev->xendev, 3,
                               "using persistent-grant %" PRIu32 "\n",
                               ioreq->refs[i]);
             } else {
@@ -410,7 +410,7 @@ static int ioreq_map(struct ioreq *ioreq)
         ioreq->pages = xengnttab_map_grant_refs
             (gnt, new_maps, domids, refs, ioreq->prot);
         if (ioreq->pages == NULL) {
-            xen_be_printf(&ioreq->blkdev->xendev, 0,
+            xen_pv_printf(&ioreq->blkdev->xendev, 0,
                           "can't map %d grant refs (%s, %d maps)\n",
                           new_maps, strerror(errno), ioreq->blkdev->cnt_map);
             return -1;
@@ -426,7 +426,7 @@ static int ioreq_map(struct ioreq *ioreq)
             ioreq->page[i] = xengnttab_map_grant_ref
                 (gnt, domids[i], refs[i], ioreq->prot);
             if (ioreq->page[i] == NULL) {
-                xen_be_printf(&ioreq->blkdev->xendev, 0,
+                xen_pv_printf(&ioreq->blkdev->xendev, 0,
                               "can't map grant ref %d (%s, %d maps)\n",
                               refs[i], strerror(errno), ioreq->blkdev->cnt_map);
                 ioreq->mapped = 1;
@@ -474,7 +474,7 @@ static int ioreq_map(struct ioreq *ioreq)
                 grant->page = ioreq->page[new_maps];
             }
             grant->blkdev = ioreq->blkdev;
-            xen_be_printf(&ioreq->blkdev->xendev, 3,
+            xen_pv_printf(&ioreq->blkdev->xendev, 3,
                           "adding grant %" PRIu32 " page: %p\n",
                           refs[new_maps], grant->page);
             g_tree_insert(ioreq->blkdev->persistent_gnts,
@@ -557,7 +557,7 @@ static int ioreq_grant_copy(struct ioreq *ioreq)
     rc = xengnttab_grant_copy(gnt, count, segs);
 
     if (rc) {
-        xen_be_printf(&ioreq->blkdev->xendev, 0,
+        xen_pv_printf(&ioreq->blkdev->xendev, 0,
                       "failed to copy data %d\n", rc);
         ioreq->aio_errors++;
         return -1;
@@ -565,7 +565,7 @@ static int ioreq_grant_copy(struct ioreq *ioreq)
 
     for (i = 0; i < count; i++) {
         if (segs[i].status != GNTST_okay) {
-            xen_be_printf(&ioreq->blkdev->xendev, 3,
+            xen_pv_printf(&ioreq->blkdev->xendev, 3,
                           "failed to copy data %d for gref %d, domid %d\n",
                           segs[i].status, ioreq->refs[i], ioreq->domids[i]);
             ioreq->aio_errors++;
@@ -599,7 +599,7 @@ static void qemu_aio_complete(void *opaque, int ret)
     struct ioreq *ioreq = opaque;
 
     if (ret != 0) {
-        xen_be_printf(&ioreq->blkdev->xendev, 0, "%s I/O error\n",
+        xen_pv_printf(&ioreq->blkdev->xendev, 0, "%s I/O error\n",
                       ioreq->req.operation == BLKIF_OP_READ ? "read" : "write");
         ioreq->aio_errors++;
     }
@@ -796,7 +796,7 @@ static void blk_send_response_all(struct XenBlkDev *blkdev)
         ioreq_release(ioreq, true);
     }
     if (send_notify) {
-        xen_be_send_notify(&blkdev->xendev);
+        xen_pv_send_notify(&blkdev->xendev);
     }
 }
 
@@ -866,7 +866,7 @@ static void blk_handle_requests(struct XenBlkDev *blkdev)
             };
 
             if (blk_send_response_one(ioreq)) {
-                xen_be_send_notify(&blkdev->xendev);
+                xen_pv_send_notify(&blkdev->xendev);
             }
             ioreq_release(ioreq, false);
             continue;
@@ -910,7 +910,7 @@ static void blk_alloc(struct XenDevice *xendev)
     }
     if (xengnttab_set_max_grants(xendev->gnttabdev,
             MAX_GRANTS(max_requests, BLKIF_MAX_SEGMENTS_PER_REQUEST)) < 0) {
-        xen_be_printf(xendev, 0, "xengnttab_set_max_grants failed: %s\n",
+        xen_pv_printf(xendev, 0, "xengnttab_set_max_grants failed: %s\n",
                       strerror(errno));
     }
 }
@@ -1056,11 +1056,11 @@ static int blk_connect(struct XenDevice *xendev)
         }
 
         /* setup via xenbus -> create new block driver instance */
-        xen_be_printf(&blkdev->xendev, 2, "create new bdrv (xenbus setup)\n");
+        xen_pv_printf(&blkdev->xendev, 2, "create new bdrv (xenbus setup)\n");
         blkdev->blk = blk_new_open(blkdev->filename, NULL, options,
                                    qflags, &local_err);
         if (!blkdev->blk) {
-            xen_be_printf(&blkdev->xendev, 0, "error: %s\n",
+            xen_pv_printf(&blkdev->xendev, 0, "error: %s\n",
                           error_get_pretty(local_err));
             error_free(local_err);
             return -1;
@@ -1068,10 +1068,11 @@ static int blk_connect(struct XenDevice *xendev)
         blk_set_enable_write_cache(blkdev->blk, !writethrough);
     } else {
         /* setup via qemu cmdline -> already setup for us */
-        xen_be_printf(&blkdev->xendev, 2, "get configured bdrv (cmdline setup)\n");
+        xen_pv_printf(&blkdev->xendev, 2,
+                      "get configured bdrv (cmdline setup)\n");
         blkdev->blk = blk_by_legacy_dinfo(blkdev->dinfo);
         if (blk_is_read_only(blkdev->blk) && !readonly) {
-            xen_be_printf(&blkdev->xendev, 0, "Unexpected read-only drive");
+            xen_pv_printf(&blkdev->xendev, 0, "Unexpected read-only drive");
             blkdev->blk = NULL;
             return -1;
         }
@@ -1084,13 +1085,13 @@ static int blk_connect(struct XenDevice *xendev)
     if (blkdev->file_size < 0) {
         BlockDriverState *bs = blk_bs(blkdev->blk);
         const char *drv_name = bs ? bdrv_get_format_name(bs) : NULL;
-        xen_be_printf(&blkdev->xendev, 1, "blk_getlength: %d (%s) | drv %s\n",
+        xen_pv_printf(&blkdev->xendev, 1, "blk_getlength: %d (%s) | drv %s\n",
                       (int)blkdev->file_size, strerror(-blkdev->file_size),
                       drv_name ?: "-");
         blkdev->file_size = 0;
     }
 
-    xen_be_printf(xendev, 1, "type \"%s\", fileproto \"%s\", filename \"%s\","
+    xen_pv_printf(xendev, 1, "type \"%s\", fileproto \"%s\", filename \"%s\","
                   " size %" PRId64 " (%" PRId64 " MB)\n",
                   blkdev->type, blkdev->fileproto, blkdev->filename,
                   blkdev->file_size, blkdev->file_size >> 20);
@@ -1174,10 +1175,10 @@ static int blk_connect(struct XenDevice *xendev)
     blkdev->feature_grant_copy =
                 (xengnttab_grant_copy(blkdev->xendev.gnttabdev, 0, NULL) == 0);
 
-    xen_be_printf(&blkdev->xendev, 3, "grant copy operation %s\n",
+    xen_pv_printf(&blkdev->xendev, 3, "grant copy operation %s\n",
                   blkdev->feature_grant_copy ? "enabled" : "disabled");
 
-    xen_be_printf(&blkdev->xendev, 1, "ok: proto %s, ring-ref %d, "
+    xen_pv_printf(&blkdev->xendev, 1, "ok: proto %s, ring-ref %d, "
                   "remote port %d, local port %d\n",
                   blkdev->xendev.protocol, blkdev->ring_ref,
                   blkdev->xendev.remote_port, blkdev->xendev.local_port);
@@ -1193,7 +1194,7 @@ static void blk_disconnect(struct XenDevice *xendev)
         blk_unref(blkdev->blk);
         blkdev->blk = NULL;
     }
-    xen_be_unbind_evtchn(&blkdev->xendev);
+    xen_pv_unbind_evtchn(&blkdev->xendev);
 
     if (blkdev->sring) {
         xengnttab_unmap(blkdev->xendev.gnttabdev, blkdev->sring, 1);
diff --git a/hw/char/xen_console.c b/hw/char/xen_console.c
index 86cdc52..c01f410 100644
--- a/hw/char/xen_console.c
+++ b/hw/char/xen_console.c
@@ -74,7 +74,7 @@ static void buffer_append(struct XenConsole *con)
 
     xen_mb();
     intf->out_cons = cons;
-    xen_be_send_notify(&con->xendev);
+    xen_pv_send_notify(&con->xendev);
 
     if (buffer->max_capacity &&
 	buffer->size > buffer->max_capacity) {
@@ -142,7 +142,7 @@ static void xencons_receive(void *opaque, const uint8_t *buf, int len)
     }
     xen_wmb();
     intf->in_prod = prod;
-    xen_be_send_notify(&con->xendev);
+    xen_pv_send_notify(&con->xendev);
 }
 
 static void xencons_send(struct XenConsole *con)
@@ -158,16 +158,17 @@ static void xencons_send(struct XenConsole *con)
         len = size;
     }
     if (len < 1) {
-	if (!con->backlog) {
-	    con->backlog = 1;
-	    xen_be_printf(&con->xendev, 1, "backlog piling up, nobody listening?\n");
-	}
+        if (!con->backlog) {
+            con->backlog = 1;
+            xen_pv_printf(&con->xendev, 1,
+                          "backlog piling up, nobody listening?\n");
+        }
     } else {
-	buffer_advance(&con->buffer, len);
-	if (con->backlog && len == size) {
-	    con->backlog = 0;
-	    xen_be_printf(&con->xendev, 1, "backlog is gone\n");
-	}
+        buffer_advance(&con->buffer, len);
+        if (con->backlog && len == size) {
+            con->backlog = 0;
+            xen_pv_printf(&con->xendev, 1, "backlog is gone\n");
+        }
     }
 }
 
@@ -191,7 +192,7 @@ static int con_init(struct XenDevice *xendev)
 
     type = xenstore_read_str(con->console, "type");
     if (!type || strcmp(type, "ioemu") != 0) {
-	xen_be_printf(xendev, 1, "not for me (type=%s)\n", type);
+        xen_pv_printf(xendev, 1, "not for me (type=%s)\n", type);
         ret = -1;
         goto out;
     }
@@ -247,7 +248,8 @@ static int con_initialise(struct XenDevice *xendev)
     qemu_chr_fe_set_handlers(&con->chr, xencons_can_receive,
                              xencons_receive, NULL, con, NULL, true);
 
-    xen_be_printf(xendev, 1, "ring mfn %d, remote port %d, local port %d, limit %zd\n",
+    xen_pv_printf(xendev, 1,
+                  "ring mfn %d, remote port %d, local port %d, limit %zd\n",
 		  con->ring_ref,
 		  con->xendev.remote_port,
 		  con->xendev.local_port,
@@ -260,7 +262,7 @@ static void con_disconnect(struct XenDevice *xendev)
     struct XenConsole *con = container_of(xendev, struct XenConsole, xendev);
 
     qemu_chr_fe_deinit(&con->chr);
-    xen_be_unbind_evtchn(&con->xendev);
+    xen_pv_unbind_evtchn(&con->xendev);
 
     if (con->sring) {
         if (!xendev->dev) {
diff --git a/hw/display/xenfb.c b/hw/display/xenfb.c
index 46b7d5e..7a8727a 100644
--- a/hw/display/xenfb.c
+++ b/hw/display/xenfb.c
@@ -90,28 +90,29 @@ static int common_bind(struct common *c)
     xen_pfn_t mfn;
 
     if (xenstore_read_fe_uint64(&c->xendev, "page-ref", &val) == -1)
-	return -1;
+        return -1;
     mfn = (xen_pfn_t)val;
     assert(val == mfn);
 
     if (xenstore_read_fe_int(&c->xendev, "event-channel", &c->xendev.remote_port) == -1)
-	return -1;
+        return -1;
 
     c->page = xenforeignmemory_map(xen_fmem, c->xendev.dom,
                                    PROT_READ | PROT_WRITE, 1, &mfn, NULL);
     if (c->page == NULL)
-	return -1;
+        return -1;
 
     xen_be_bind_evtchn(&c->xendev);
-    xen_be_printf(&c->xendev, 1, "ring mfn %"PRI_xen_pfn", remote-port %d, local-port %d\n",
-		  mfn, c->xendev.remote_port, c->xendev.local_port);
+    xen_pv_printf(&c->xendev, 1,
+                  "ring mfn %"PRI_xen_pfn", remote-port %d, local-port %d\n",
+                  mfn, c->xendev.remote_port, c->xendev.local_port);
 
     return 0;
 }
 
 static void common_unbind(struct common *c)
 {
-    xen_be_unbind_evtchn(&c->xendev);
+    xen_pv_unbind_evtchn(&c->xendev);
     if (c->page) {
         xenforeignmemory_unmap(xen_fmem, c->page, 1);
 	c->page = NULL;
@@ -214,7 +215,7 @@ static int xenfb_kbd_event(struct XenInput *xenfb,
     XENKBD_IN_RING_REF(page, prod) = *event;
     xen_wmb();		/* ensure ring contents visible */
     page->in_prod = prod + 1;
-    return xen_be_send_notify(&xenfb->c.xendev);
+    return xen_pv_send_notify(&xenfb->c.xendev);
 }
 
 /* Send a keyboard (or mouse button) event */
@@ -345,7 +346,7 @@ static int input_initialise(struct XenDevice *xendev)
     int rc;
 
     if (!in->c.con) {
-        xen_be_printf(xendev, 1, "ds not set (yet)\n");
+        xen_pv_printf(xendev, 1, "ds not set (yet)\n");
         return -1;
     }
 
@@ -396,7 +397,7 @@ static void input_event(struct XenDevice *xendev)
     if (page->out_prod == page->out_cons)
 	return;
     page->out_cons = page->out_prod;
-    xen_be_send_notify(&xenfb->c.xendev);
+    xen_pv_send_notify(&xenfb->c.xendev);
 }
 
 /* -------------------------------------------------------------------- */
@@ -500,8 +501,8 @@ out:
 }
 
 static int xenfb_configure_fb(struct XenFB *xenfb, size_t fb_len_lim,
-			      int width, int height, int depth,
-			      size_t fb_len, int offset, int row_stride)
+                              int width, int height, int depth,
+                              size_t fb_len, int offset, int row_stride)
 {
     size_t mfn_sz = sizeof(*((struct xenfb_page *)0)->pd);
     size_t pd_len = sizeof(((struct xenfb_page *)0)->pd) / mfn_sz;
@@ -510,40 +511,47 @@ static int xenfb_configure_fb(struct XenFB *xenfb, size_t fb_len_lim,
     int max_width, max_height;
 
     if (fb_len_lim > fb_len_max) {
-	xen_be_printf(&xenfb->c.xendev, 0, "fb size limit %zu exceeds %zu, corrected\n",
-		      fb_len_lim, fb_len_max);
-	fb_len_lim = fb_len_max;
+        xen_pv_printf(&xenfb->c.xendev, 0,
+                      "fb size limit %zu exceeds %zu, corrected\n",
+                      fb_len_lim, fb_len_max);
+        fb_len_lim = fb_len_max;
     }
     if (fb_len_lim && fb_len > fb_len_lim) {
-	xen_be_printf(&xenfb->c.xendev, 0, "frontend fb size %zu limited to %zu\n",
-		      fb_len, fb_len_lim);
-	fb_len = fb_len_lim;
+        xen_pv_printf(&xenfb->c.xendev, 0,
+                      "frontend fb size %zu limited to %zu\n",
+                      fb_len, fb_len_lim);
+        fb_len = fb_len_lim;
     }
     if (depth != 8 && depth != 16 && depth != 24 && depth != 32) {
-	xen_be_printf(&xenfb->c.xendev, 0, "can't handle frontend fb depth %d\n",
-		      depth);
-	return -1;
+        xen_pv_printf(&xenfb->c.xendev, 0,
+                      "can't handle frontend fb depth %d\n",
+                      depth);
+        return -1;
     }
     if (row_stride <= 0 || row_stride > fb_len) {
-	xen_be_printf(&xenfb->c.xendev, 0, "invalid frontend stride %d\n", row_stride);
-	return -1;
+        xen_pv_printf(&xenfb->c.xendev, 0, "invalid frontend stride %d\n",
+                      row_stride);
+        return -1;
     }
     max_width = row_stride / (depth / 8);
     if (width < 0 || width > max_width) {
-	xen_be_printf(&xenfb->c.xendev, 0, "invalid frontend width %d limited to %d\n",
-		      width, max_width);
-	width = max_width;
+        xen_pv_printf(&xenfb->c.xendev, 0,
+                      "invalid frontend width %d limited to %d\n",
+                      width, max_width);
+        width = max_width;
     }
     if (offset < 0 || offset >= fb_len) {
-	xen_be_printf(&xenfb->c.xendev, 0, "invalid frontend offset %d (max %zu)\n",
-		      offset, fb_len - 1);
-	return -1;
+        xen_pv_printf(&xenfb->c.xendev, 0,
+                      "invalid frontend offset %d (max %zu)\n",
+                      offset, fb_len - 1);
+        return -1;
     }
     max_height = (fb_len - offset) / row_stride;
     if (height < 0 || height > max_height) {
-	xen_be_printf(&xenfb->c.xendev, 0, "invalid frontend height %d limited to %d\n",
-		      height, max_height);
-	height = max_height;
+        xen_pv_printf(&xenfb->c.xendev, 0,
+                      "invalid frontend height %d limited to %d\n",
+                      height, max_height);
+        height = max_height;
     }
     xenfb->fb_len = fb_len;
     xenfb->row_stride = row_stride;
@@ -553,8 +561,9 @@ static int xenfb_configure_fb(struct XenFB *xenfb, size_t fb_len_lim,
     xenfb->offset = offset;
     xenfb->up_fullscreen = 1;
     xenfb->do_resize = 1;
-    xen_be_printf(&xenfb->c.xendev, 1, "framebuffer %dx%dx%d offset %d stride %d\n",
-		  width, height, depth, offset, row_stride);
+    xen_pv_printf(&xenfb->c.xendev, 1,
+                  "framebuffer %dx%dx%d offset %d stride %d\n",
+                  width, height, depth, offset, row_stride);
     return 0;
 }
 
@@ -631,7 +640,7 @@ static void xenfb_guest_copy(struct XenFB *xenfb, int x, int y, int w, int h)
 	}
     }
     if (oops) /* should not happen */
-        xen_be_printf(&xenfb->c.xendev, 0, "%s: oops: convert %d -> %d bpp?\n",
+        xen_pv_printf(&xenfb->c.xendev, 0, "%s: oops: convert %d -> %d bpp?\n",
                       __FUNCTION__, xenfb->depth, bpp);
 
     dpy_gfx_update(xenfb->c.con, x, y, w, h);
@@ -663,7 +672,7 @@ static void xenfb_send_event(struct XenFB *xenfb, union xenfb_in_event *event)
     xen_wmb();                  /* ensure ring contents visible */
     page->in_prod = prod + 1;
 
-    xen_be_send_notify(&xenfb->c.xendev);
+    xen_pv_send_notify(&xenfb->c.xendev);
 }
 
 static void xenfb_send_refresh_period(struct XenFB *xenfb, int period)
@@ -696,9 +705,9 @@ static void xenfb_update(void *opaque)
         return;
 
     if (!xenfb->feature_update) {
-	/* we don't get update notifications, thus use the
-	 * sledge hammer approach ... */
-	xenfb->up_fullscreen = 1;
+        /* we don't get update notifications, thus use the
+         * sledge hammer approach ... */
+        xenfb->up_fullscreen = 1;
     }
 
     /* resize if needed */
@@ -721,7 +730,8 @@ static void xenfb_update(void *opaque)
             break;
         }
         dpy_gfx_replace_surface(xenfb->c.con, surface);
-        xen_be_printf(&xenfb->c.xendev, 1, "update: resizing: %dx%d @ %d bpp%s\n",
+        xen_pv_printf(&xenfb->c.xendev, 1,
+                      "update: resizing: %dx%d @ %d bpp%s\n",
                       xenfb->width, xenfb->height, xenfb->depth,
                       is_buffer_shared(surface) ? " (shared)" : "");
         xenfb->up_fullscreen = 1;
@@ -729,18 +739,19 @@ static void xenfb_update(void *opaque)
 
     /* run queued updates */
     if (xenfb->up_fullscreen) {
-	xen_be_printf(&xenfb->c.xendev, 3, "update: fullscreen\n");
-	xenfb_guest_copy(xenfb, 0, 0, xenfb->width, xenfb->height);
+        xen_pv_printf(&xenfb->c.xendev, 3, "update: fullscreen\n");
+        xenfb_guest_copy(xenfb, 0, 0, xenfb->width, xenfb->height);
     } else if (xenfb->up_count) {
-	xen_be_printf(&xenfb->c.xendev, 3, "update: %d rects\n", xenfb->up_count);
-	for (i = 0; i < xenfb->up_count; i++)
-	    xenfb_guest_copy(xenfb,
-			     xenfb->up_rects[i].x,
-			     xenfb->up_rects[i].y,
-			     xenfb->up_rects[i].w,
-			     xenfb->up_rects[i].h);
+        xen_pv_printf(&xenfb->c.xendev, 3, "update: %d rects\n",
+                      xenfb->up_count);
+        for (i = 0; i < xenfb->up_count; i++)
+            xenfb_guest_copy(xenfb,
+                             xenfb->up_rects[i].x,
+                             xenfb->up_rects[i].y,
+                             xenfb->up_rects[i].w,
+                             xenfb->up_rects[i].h);
     } else {
-	xen_be_printf(&xenfb->c.xendev, 3, "update: nothing\n");
+        xen_pv_printf(&xenfb->c.xendev, 3, "update: nothing\n");
     }
     xenfb->up_count = 0;
     xenfb->up_fullscreen = 0;
@@ -794,14 +805,14 @@ static void xenfb_handle_events(struct XenFB *xenfb)
 	    w = MIN(event->update.width, xenfb->width - x);
 	    h = MIN(event->update.height, xenfb->height - y);
 	    if (w < 0 || h < 0) {
-                xen_be_printf(&xenfb->c.xendev, 1, "bogus update ignored\n");
+                xen_pv_printf(&xenfb->c.xendev, 1, "bogus update ignored\n");
 		break;
 	    }
 	    if (x != event->update.x ||
                 y != event->update.y ||
 		w != event->update.width ||
 		h != event->update.height) {
-                xen_be_printf(&xenfb->c.xendev, 1, "bogus update clipped\n");
+                xen_pv_printf(&xenfb->c.xendev, 1, "bogus update clipped\n");
 	    }
 	    if (w == xenfb->width && h > xenfb->height / 2) {
 		/* scroll detector: updated more than 50% of the lines,
@@ -883,7 +894,7 @@ static int fb_initialise(struct XenDevice *xendev)
     if (fb->feature_update)
 	xenstore_write_be_int(xendev, "request-update", 1);
 
-    xen_be_printf(xendev, 1, "feature-update=%d, videoram=%d\n",
+    xen_pv_printf(xendev, 1, "feature-update=%d, videoram=%d\n",
 		  fb->feature_update, videoram);
     return 0;
 }
@@ -902,7 +913,7 @@ static void fb_disconnect(struct XenDevice *xendev)
                       PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANON,
                       -1, 0);
     if (fb->pixels == MAP_FAILED) {
-        xen_be_printf(xendev, 0,
+        xen_pv_printf(xendev, 0,
                 "Couldn't replace the framebuffer with anonymous memory errno=%d\n",
                 errno);
     }
@@ -923,7 +934,7 @@ static void fb_frontend_changed(struct XenDevice *xendev, const char *node)
     if (fb->bug_trigger == 0 && strcmp(node, "state") == 0 &&
         xendev->fe_state == XenbusStateConnected &&
         xendev->be_state == XenbusStateConnected) {
-        xen_be_printf(xendev, 2, "re-trigger connected (frontend bug)\n");
+        xen_pv_printf(xendev, 2, "re-trigger connected (frontend bug)\n");
         xen_be_set_state(xendev, XenbusStateConnected);
         fb->bug_trigger = 1; /* only once */
     }
@@ -934,7 +945,7 @@ static void fb_event(struct XenDevice *xendev)
     struct XenFB *xenfb = container_of(xendev, struct XenFB, c.xendev);
 
     xenfb_handle_events(xenfb);
-    xen_be_send_notify(&xenfb->c.xendev);
+    xen_pv_send_notify(&xenfb->c.xendev);
 }
 
 /* -------------------------------------------------------------------- */
@@ -977,14 +988,14 @@ void xen_init_display(int domid)
 wait_more:
     i++;
     main_loop_wait(true);
-    xfb = xen_be_find_xendev("vfb", domid, 0);
-    xin = xen_be_find_xendev("vkbd", domid, 0);
+    xfb = xen_pv_find_xendev("vfb", domid, 0);
+    xin = xen_pv_find_xendev("vkbd", domid, 0);
     if (!xfb || !xin) {
         if (i < 256) {
             usleep(10000);
             goto wait_more;
         }
-        xen_be_printf(NULL, 1, "displaystate setup failed\n");
+        xen_pv_printf(NULL, 1, "displaystate setup failed\n");
         return;
     }
 
diff --git a/hw/net/xen_nic.c b/hw/net/xen_nic.c
index 6856b52..20c43a6 100644
--- a/hw/net/xen_nic.c
+++ b/hw/net/xen_nic.c
@@ -69,7 +69,7 @@ static void net_tx_response(struct XenNetDev *netdev, netif_tx_request_t *txp, i
     netdev->tx_ring.rsp_prod_pvt = ++i;
     RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&netdev->tx_ring, notify);
     if (notify) {
-        xen_be_send_notify(&netdev->xendev);
+        xen_pv_send_notify(&netdev->xendev);
     }
 
     if (i == netdev->tx_ring.req_cons) {
@@ -128,30 +128,32 @@ static void net_tx_packets(struct XenNetDev *netdev)
             /* should not happen in theory, we don't announce the *
              * feature-{sg,gso,whatelse} flags in xenstore (yet?) */
             if (txreq.flags & NETTXF_extra_info) {
-                xen_be_printf(&netdev->xendev, 0, "FIXME: extra info flag\n");
+                xen_pv_printf(&netdev->xendev, 0, "FIXME: extra info flag\n");
                 net_tx_error(netdev, &txreq, rc);
                 continue;
             }
             if (txreq.flags & NETTXF_more_data) {
-                xen_be_printf(&netdev->xendev, 0, "FIXME: more data flag\n");
+                xen_pv_printf(&netdev->xendev, 0, "FIXME: more data flag\n");
                 net_tx_error(netdev, &txreq, rc);
                 continue;
             }
 #endif
 
             if (txreq.size < 14) {
-                xen_be_printf(&netdev->xendev, 0, "bad packet size: %d\n", txreq.size);
+                xen_pv_printf(&netdev->xendev, 0, "bad packet size: %d\n",
+                              txreq.size);
                 net_tx_error(netdev, &txreq, rc);
                 continue;
             }
 
             if ((txreq.offset + txreq.size) > XC_PAGE_SIZE) {
-                xen_be_printf(&netdev->xendev, 0, "error: page crossing\n");
+                xen_pv_printf(&netdev->xendev, 0, "error: page crossing\n");
                 net_tx_error(netdev, &txreq, rc);
                 continue;
             }
 
-            xen_be_printf(&netdev->xendev, 3, "tx packet ref %d, off %d, len %d, flags 0x%x%s%s%s%s\n",
+            xen_pv_printf(&netdev->xendev, 3,
+                          "tx packet ref %d, off %d, len %d, flags 0x%x%s%s%s%s\n",
                           txreq.gref, txreq.offset, txreq.size, txreq.flags,
                           (txreq.flags & NETTXF_csum_blank)     ? " csum_blank"     : "",
                           (txreq.flags & NETTXF_data_validated) ? " data_validated" : "",
@@ -162,8 +164,9 @@ static void net_tx_packets(struct XenNetDev *netdev)
                                            netdev->xendev.dom,
                                            txreq.gref, PROT_READ);
             if (page == NULL) {
-                xen_be_printf(&netdev->xendev, 0, "error: tx gref dereference failed (%d)\n",
-                              txreq.gref);
+                xen_pv_printf(&netdev->xendev, 0,
+                              "error: tx gref dereference failed (%d)\n",
+                             txreq.gref);
                 net_tx_error(netdev, &txreq, rc);
                 continue;
             }
@@ -211,13 +214,14 @@ static void net_rx_response(struct XenNetDev *netdev,
         resp->status = (int16_t)st;
     }
 
-    xen_be_printf(&netdev->xendev, 3, "rx response: idx %d, status %d, flags 0x%x\n",
+    xen_pv_printf(&netdev->xendev, 3,
+                  "rx response: idx %d, status %d, flags 0x%x\n",
                   i, resp->status, resp->flags);
 
     netdev->rx_ring.rsp_prod_pvt = ++i;
     RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&netdev->rx_ring, notify);
     if (notify) {
-        xen_be_send_notify(&netdev->xendev);
+        xen_pv_send_notify(&netdev->xendev);
     }
 }
 
@@ -242,7 +246,7 @@ static ssize_t net_rx_packet(NetClientState *nc, const uint8_t *buf, size_t size
         return 0;
     }
     if (size > XC_PAGE_SIZE - NET_IP_ALIGN) {
-        xen_be_printf(&netdev->xendev, 0, "packet too big (%lu > %ld)",
+        xen_pv_printf(&netdev->xendev, 0, "packet too big (%lu > %ld)",
                       (unsigned long)size, XC_PAGE_SIZE - NET_IP_ALIGN);
         return -1;
     }
@@ -254,7 +258,8 @@ static ssize_t net_rx_packet(NetClientState *nc, const uint8_t *buf, size_t size
                                    netdev->xendev.dom,
                                    rxreq.gref, PROT_WRITE);
     if (page == NULL) {
-        xen_be_printf(&netdev->xendev, 0, "error: rx gref dereference failed (%d)\n",
+        xen_pv_printf(&netdev->xendev, 0,
+                      "error: rx gref dereference failed (%d)\n",
                       rxreq.gref);
         net_rx_response(netdev, &rxreq, NETIF_RSP_ERROR, 0, 0, 0);
         return -1;
@@ -328,7 +333,8 @@ static int net_connect(struct XenDevice *xendev)
         rx_copy = 0;
     }
     if (rx_copy == 0) {
-        xen_be_printf(&netdev->xendev, 0, "frontend doesn't support rx-copy.\n");
+        xen_pv_printf(&netdev->xendev, 0,
+                      "frontend doesn't support rx-copy.\n");
         return -1;
     }
 
@@ -353,7 +359,7 @@ static int net_connect(struct XenDevice *xendev)
 
     xen_be_bind_evtchn(&netdev->xendev);
 
-    xen_be_printf(&netdev->xendev, 1, "ok: tx-ring-ref %d, rx-ring-ref %d, "
+    xen_pv_printf(&netdev->xendev, 1, "ok: tx-ring-ref %d, rx-ring-ref %d, "
                   "remote port %d, local port %d\n",
                   netdev->tx_ring_ref, netdev->rx_ring_ref,
                   netdev->xendev.remote_port, netdev->xendev.local_port);
@@ -366,7 +372,7 @@ static void net_disconnect(struct XenDevice *xendev)
 {
     struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev);
 
-    xen_be_unbind_evtchn(&netdev->xendev);
+    xen_pv_unbind_evtchn(&netdev->xendev);
 
     if (netdev->txs) {
         xengnttab_unmap(netdev->xendev.gnttabdev, netdev->txs, 1);
diff --git a/hw/usb/xen-usb.c b/hw/usb/xen-usb.c
index de2ebd6..1b3c2fb 100644
--- a/hw/usb/xen-usb.c
+++ b/hw/usb/xen-usb.c
@@ -47,7 +47,7 @@
         struct timeval tv;                                          \
                                                                     \
         gettimeofday(&tv, NULL);                                    \
-        xen_be_printf(xendev, lvl, "%8ld.%06ld xen-usb(%s):" fmt,   \
+        xen_pv_printf(xendev, lvl, "%8ld.%06ld xen-usb(%s):" fmt,   \
                       tv.tv_sec, tv.tv_usec, __func__, ##args);     \
     }
 #define TR_BUS(xendev, fmt, args...) TR(xendev, 2, fmt, ##args)
@@ -153,7 +153,7 @@ static int usbback_gnttab_map(struct usbback_req *usbback_req)
     }
 
     if (nr_segs > USBIF_MAX_SEGMENTS_PER_REQUEST) {
-        xen_be_printf(xendev, 0, "bad number of segments in request (%d)\n",
+        xen_pv_printf(xendev, 0, "bad number of segments in request (%d)\n",
                       nr_segs);
         return -EINVAL;
     }
@@ -161,7 +161,7 @@ static int usbback_gnttab_map(struct usbback_req *usbback_req)
     for (i = 0; i < nr_segs; i++) {
         if ((unsigned)usbback_req->req.seg[i].offset +
             (unsigned)usbback_req->req.seg[i].length > XC_PAGE_SIZE) {
-            xen_be_printf(xendev, 0, "segment crosses page boundary\n");
+            xen_pv_printf(xendev, 0, "segment crosses page boundary\n");
             return -EINVAL;
         }
     }
@@ -199,7 +199,7 @@ static int usbback_gnttab_map(struct usbback_req *usbback_req)
      */
 
     if (!usbback_req->nr_extra_segs) {
-        xen_be_printf(xendev, 0, "iso request without descriptor segments\n");
+        xen_pv_printf(xendev, 0, "iso request without descriptor segments\n");
         return -EINVAL;
     }
 
@@ -314,7 +314,7 @@ static void usbback_do_response(struct usbback_req *usbback_req, int32_t status,
         RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&usbif->urb_ring, notify);
 
         if (notify) {
-            xen_be_send_notify(xendev);
+            xen_pv_send_notify(xendev);
         }
     }
 
@@ -551,14 +551,14 @@ static void usbback_dispatch(struct usbback_req *usbback_req)
 
     ret = usbback_init_packet(usbback_req);
     if (ret) {
-        xen_be_printf(&usbif->xendev, 0, "invalid request\n");
+        xen_pv_printf(&usbif->xendev, 0, "invalid request\n");
         ret = -ESHUTDOWN;
         goto fail_free_urb;
     }
 
     ret = usbback_gnttab_map(usbback_req);
     if (ret) {
-        xen_be_printf(&usbif->xendev, 0, "invalid buffer, ret=%d\n", ret);
+        xen_pv_printf(&usbif->xendev, 0, "invalid buffer, ret=%d\n", ret);
         ret = -ESHUTDOWN;
         goto fail_free_urb;
     }
@@ -590,7 +590,7 @@ static void usbback_hotplug_notify(struct usbback_info *usbif)
 
     /* Check for full ring. */
     if ((RING_SIZE(ring) - ring->rsp_prod_pvt - ring->req_cons) == 0) {
-        xen_be_send_notify(&usbif->xendev);
+        xen_pv_send_notify(&usbif->xendev);
         return;
     }
 
@@ -609,7 +609,7 @@ static void usbback_hotplug_notify(struct usbback_info *usbif)
     RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(ring, notify);
 
     if (notify) {
-        xen_be_send_notify(&usbif->xendev);
+        xen_pv_send_notify(&usbif->xendev);
     }
 
     TR_BUS(&usbif->xendev, "hotplug port %d speed %d\n", usb_hp->port,
@@ -646,7 +646,7 @@ static void usbback_bh(void *opaque)
 
     if (RING_REQUEST_PROD_OVERFLOW(urb_ring, rp)) {
         rc = urb_ring->rsp_prod_pvt;
-        xen_be_printf(&usbif->xendev, 0, "domU provided bogus ring requests "
+        xen_pv_printf(&usbif->xendev, 0, "domU provided bogus ring requests "
                       "(%#x - %#x = %u). Halting ring processing.\n",
                       rp, rc, rp - rc);
         usbif->ring_error = true;
@@ -744,7 +744,7 @@ static void usbback_portid_add(struct usbback_info *usbif, unsigned port,
 
     portname = strchr(busid, '-');
     if (!portname) {
-        xen_be_printf(&usbif->xendev, 0, "device %s illegal specification\n",
+        xen_pv_printf(&usbif->xendev, 0, "device %s illegal specification\n",
                       busid);
         return;
     }
@@ -783,7 +783,7 @@ static void usbback_portid_add(struct usbback_info *usbif, unsigned port,
         break;
     }
     if (speed == USBIF_SPEED_NONE) {
-        xen_be_printf(&usbif->xendev, 0, "device %s wrong speed\n", busid);
+        xen_pv_printf(&usbif->xendev, 0, "device %s wrong speed\n", busid);
         object_unparent(OBJECT(usbif->ports[port - 1].dev));
         usbif->ports[port - 1].dev = NULL;
         return;
@@ -800,7 +800,7 @@ static void usbback_portid_add(struct usbback_info *usbif, unsigned port,
 err:
     QDECREF(qdict);
     snprintf(p->path, sizeof(p->path), "%d", 99);
-    xen_be_printf(&usbif->xendev, 0, "device %s could not be opened\n", busid);
+    xen_pv_printf(&usbif->xendev, 0, "device %s could not be opened\n", busid);
 }
 
 static void usbback_process_port(struct usbback_info *usbif, unsigned port)
@@ -811,7 +811,7 @@ static void usbback_process_port(struct usbback_info *usbif, unsigned port)
     snprintf(node, sizeof(node), "port/%d", port);
     busid = xenstore_read_be_str(&usbif->xendev, node);
     if (busid == NULL) {
-        xen_be_printf(&usbif->xendev, 0, "xenstore_read %s failed\n", node);
+        xen_pv_printf(&usbif->xendev, 0, "xenstore_read %s failed\n", node);
         return;
     }
 
@@ -834,7 +834,7 @@ static void usbback_disconnect(struct XenDevice *xendev)
 
     usbif = container_of(xendev, struct usbback_info, xendev);
 
-    xen_be_unbind_evtchn(xendev);
+    xen_pv_unbind_evtchn(xendev);
 
     if (usbif->urb_sring) {
         xengnttab_unmap(xendev->gnttabdev, usbif->urb_sring, 1);
@@ -868,15 +868,15 @@ static int usbback_connect(struct XenDevice *xendev)
     usbif = container_of(xendev, struct usbback_info, xendev);
 
     if (xenstore_read_fe_int(xendev, "urb-ring-ref", &urb_ring_ref)) {
-        xen_be_printf(xendev, 0, "error reading urb-ring-ref\n");
+        xen_pv_printf(xendev, 0, "error reading urb-ring-ref\n");
         return -1;
     }
     if (xenstore_read_fe_int(xendev, "conn-ring-ref", &conn_ring_ref)) {
-        xen_be_printf(xendev, 0, "error reading conn-ring-ref\n");
+        xen_pv_printf(xendev, 0, "error reading conn-ring-ref\n");
         return -1;
     }
     if (xenstore_read_fe_int(xendev, "event-channel", &xendev->remote_port)) {
-        xen_be_printf(xendev, 0, "error reading event-channel\n");
+        xen_pv_printf(xendev, 0, "error reading event-channel\n");
         return -1;
     }
 
@@ -887,7 +887,7 @@ static int usbback_connect(struct XenDevice *xendev)
                                                 conn_ring_ref,
                                                 PROT_READ | PROT_WRITE);
     if (!usbif->urb_sring || !usbif->conn_sring) {
-        xen_be_printf(xendev, 0, "error mapping rings\n");
+        xen_pv_printf(xendev, 0, "error mapping rings\n");
         usbback_disconnect(xendev);
         return -1;
     }
@@ -899,7 +899,7 @@ static int usbback_connect(struct XenDevice *xendev)
 
     xen_be_bind_evtchn(xendev);
 
-    xen_be_printf(xendev, 1, "urb-ring-ref %d, conn-ring-ref %d, "
+    xen_pv_printf(xendev, 1, "urb-ring-ref %d, conn-ring-ref %d, "
                   "remote port %d, local port %d\n", urb_ring_ref,
                   conn_ring_ref, xendev->remote_port, xendev->local_port);
 
@@ -935,12 +935,12 @@ static int usbback_init(struct XenDevice *xendev)
 
     if (xenstore_read_be_int(xendev, "num-ports", &usbif->num_ports) ||
         usbif->num_ports < 1 || usbif->num_ports > USBBACK_MAXPORTS) {
-        xen_be_printf(xendev, 0, "num-ports not readable or out of bounds\n");
+        xen_pv_printf(xendev, 0, "num-ports not readable or out of bounds\n");
         return -1;
     }
     if (xenstore_read_be_int(xendev, "usb-ver", &usbif->usb_ver) ||
         (usbif->usb_ver != USB_VER_USB11 && usbif->usb_ver != USB_VER_USB20)) {
-        xen_be_printf(xendev, 0, "usb-ver not readable or out of bounds\n");
+        xen_pv_printf(xendev, 0, "usb-ver not readable or out of bounds\n");
         return -1;
     }
 
@@ -1028,7 +1028,7 @@ static void usbback_alloc(struct XenDevice *xendev)
     /* max_grants: for each request and for the rings (request and connect). */
     max_grants = USBIF_MAX_SEGMENTS_PER_REQUEST * USB_URB_RING_SIZE + 2;
     if (xengnttab_set_max_grants(xendev->gnttabdev, max_grants) < 0) {
-        xen_be_printf(xendev, 0, "xengnttab_set_max_grants failed: %s\n",
+        xen_pv_printf(xendev, 0, "xengnttab_set_max_grants failed: %s\n",
                       strerror(errno));
     }
 }
diff --git a/hw/xen/Makefile.objs b/hw/xen/Makefile.objs
index d367094..591cdc2 100644
--- a/hw/xen/Makefile.objs
+++ b/hw/xen/Makefile.objs
@@ -1,5 +1,5 @@
 # xen backend driver support
-common-obj-$(CONFIG_XEN_BACKEND) += xen_backend.o xen_devconfig.o
+common-obj-$(CONFIG_XEN_BACKEND) += xen_backend.o xen_devconfig.o xen_pvdev.o
 
 obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen-host-pci-device.o
 obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen_pt.o xen_pt_config_init.o xen_pt_graphics.o xen_pt_msi.o
diff --git a/hw/xen/xen_backend.c b/hw/xen/xen_backend.c
index 69a2388..41ba5c5 100644
--- a/hw/xen/xen_backend.c
+++ b/hw/xen/xen_backend.c
@@ -30,6 +30,7 @@
 #include "sysemu/char.h"
 #include "qemu/log.h"
 #include "hw/xen/xen_backend.h"
+#include "hw/xen/xen_pvdev.h"
 
 #include <xen/grant_table.h>
 
@@ -46,129 +47,7 @@ struct xs_handle *xenstore = NULL;
 const char *xen_protocol;
 
 /* private */
-struct xs_dirs {
-    char *xs_dir;
-    QTAILQ_ENTRY(xs_dirs) list;
-};
-static QTAILQ_HEAD(xs_dirs_head, xs_dirs) xs_cleanup =
-    QTAILQ_HEAD_INITIALIZER(xs_cleanup);
-
-static QTAILQ_HEAD(XenDeviceHead, XenDevice) xendevs = QTAILQ_HEAD_INITIALIZER(xendevs);
-static int debug = 0;
-
-/* ------------------------------------------------------------- */
-
-static void xenstore_cleanup_dir(char *dir)
-{
-    struct xs_dirs *d;
-
-    d = g_malloc(sizeof(*d));
-    d->xs_dir = dir;
-    QTAILQ_INSERT_TAIL(&xs_cleanup, d, list);
-}
-
-void xen_config_cleanup(void)
-{
-    struct xs_dirs *d;
-
-    QTAILQ_FOREACH(d, &xs_cleanup, list) {
-        xs_rm(xenstore, 0, d->xs_dir);
-    }
-}
-
-int xenstore_write_str(const char *base, const char *node, const char *val)
-{
-    char abspath[XEN_BUFSIZE];
-
-    snprintf(abspath, sizeof(abspath), "%s/%s", base, node);
-    if (!xs_write(xenstore, 0, abspath, val, strlen(val))) {
-        return -1;
-    }
-    return 0;
-}
-
-char *xenstore_read_str(const char *base, const char *node)
-{
-    char abspath[XEN_BUFSIZE];
-    unsigned int len;
-    char *str, *ret = NULL;
-
-    snprintf(abspath, sizeof(abspath), "%s/%s", base, node);
-    str = xs_read(xenstore, 0, abspath, &len);
-    if (str != NULL) {
-        /* move to qemu-allocated memory to make sure
-         * callers can savely g_free() stuff. */
-        ret = g_strdup(str);
-        free(str);
-    }
-    return ret;
-}
-
-int xenstore_mkdir(char *path, int p)
-{
-    struct xs_permissions perms[2] = {
-        {
-            .id    = 0, /* set owner: dom0 */
-        }, {
-            .id    = xen_domid,
-            .perms = p,
-        }
-    };
-
-    if (!xs_mkdir(xenstore, 0, path)) {
-        xen_be_printf(NULL, 0, "xs_mkdir %s: failed\n", path);
-        return -1;
-    }
-    xenstore_cleanup_dir(g_strdup(path));
-
-    if (!xs_set_permissions(xenstore, 0, path, perms, 2)) {
-        xen_be_printf(NULL, 0, "xs_set_permissions %s: failed\n", path);
-        return -1;
-    }
-    return 0;
-}
-
-int xenstore_write_int(const char *base, const char *node, int ival)
-{
-    char val[12];
-
-    snprintf(val, sizeof(val), "%d", ival);
-    return xenstore_write_str(base, node, val);
-}
-
-int xenstore_write_int64(const char *base, const char *node, int64_t ival)
-{
-    char val[21];
-
-    snprintf(val, sizeof(val), "%"PRId64, ival);
-    return xenstore_write_str(base, node, val);
-}
-
-int xenstore_read_int(const char *base, const char *node, int *ival)
-{
-    char *val;
-    int rc = -1;
-
-    val = xenstore_read_str(base, node);
-    if (val && 1 == sscanf(val, "%d", ival)) {
-        rc = 0;
-    }
-    g_free(val);
-    return rc;
-}
-
-int xenstore_read_uint64(const char *base, const char *node, uint64_t *uval)
-{
-    char *val;
-    int rc = -1;
-
-    val = xenstore_read_str(base, node);
-    if (val && 1 == sscanf(val, "%"SCNu64, uval)) {
-        rc = 0;
-    }
-    g_free(val);
-    return rc;
-}
+static int debug;
 
 int xenstore_write_be_str(struct XenDevice *xendev, const char *node, const char *val)
 {
@@ -205,27 +84,14 @@ int xenstore_read_fe_int(struct XenDevice *xendev, const char *node, int *ival)
     return xenstore_read_int(xendev->fe, node, ival);
 }
 
-int xenstore_read_fe_uint64(struct XenDevice *xendev, const char *node, uint64_t *uval)
+int xenstore_read_fe_uint64(struct XenDevice *xendev, const char *node,
+                            uint64_t *uval)
 {
     return xenstore_read_uint64(xendev->fe, node, uval);
 }
 
 /* ------------------------------------------------------------- */
 
-const char *xenbus_strstate(enum xenbus_state state)
-{
-    static const char *const name[] = {
-        [ XenbusStateUnknown      ] = "Unknown",
-        [ XenbusStateInitialising ] = "Initialising",
-        [ XenbusStateInitWait     ] = "InitWait",
-        [ XenbusStateInitialised  ] = "Initialised",
-        [ XenbusStateConnected    ] = "Connected",
-        [ XenbusStateClosing      ] = "Closing",
-        [ XenbusStateClosed       ] = "Closed",
-    };
-    return (state < ARRAY_SIZE(name)) ? name[state] : "INVALID";
-}
-
 int xen_be_set_state(struct XenDevice *xendev, enum xenbus_state state)
 {
     int rc;
@@ -234,33 +100,12 @@ int xen_be_set_state(struct XenDevice *xendev, enum xenbus_state state)
     if (rc < 0) {
         return rc;
     }
-    xen_be_printf(xendev, 1, "backend state: %s -> %s\n",
+    xen_pv_printf(xendev, 1, "backend state: %s -> %s\n",
                   xenbus_strstate(xendev->be_state), xenbus_strstate(state));
     xendev->be_state = state;
     return 0;
 }
 
-/* ------------------------------------------------------------- */
-
-struct XenDevice *xen_be_find_xendev(const char *type, int dom, int dev)
-{
-    struct XenDevice *xendev;
-
-    QTAILQ_FOREACH(xendev, &xendevs, next) {
-        if (xendev->dom != dom) {
-            continue;
-        }
-        if (xendev->dev != dev) {
-            continue;
-        }
-        if (strcmp(xendev->type, type) != 0) {
-            continue;
-        }
-        return xendev;
-    }
-    return NULL;
-}
-
 /*
  * get xen backend device, allocate a new one if it doesn't exist.
  */
@@ -269,7 +114,7 @@ static struct XenDevice *xen_be_get_xendev(const char *type, int dom, int dev,
 {
     struct XenDevice *xendev;
 
-    xendev = xen_be_find_xendev(type, dom, dev);
+    xendev = xen_pv_find_xendev(type, dom, dev);
     if (xendev) {
         return xendev;
     }
@@ -291,7 +136,7 @@ static struct XenDevice *xen_be_get_xendev(const char *type, int dom, int dev,
 
     xendev->evtchndev = xenevtchn_open(NULL, 0);
     if (xendev->evtchndev == NULL) {
-        xen_be_printf(NULL, 0, "can't open evtchn device\n");
+        xen_pv_printf(NULL, 0, "can't open evtchn device\n");
         g_free(xendev);
         return NULL;
     }
@@ -300,7 +145,7 @@ static struct XenDevice *xen_be_get_xendev(const char *type, int dom, int dev,
     if (ops->flags & DEVOPS_FLAG_NEED_GNTDEV) {
         xendev->gnttabdev = xengnttab_open(NULL, 0);
         if (xendev->gnttabdev == NULL) {
-            xen_be_printf(NULL, 0, "can't open gnttab device\n");
+            xen_pv_printf(NULL, 0, "can't open gnttab device\n");
             xenevtchn_close(xendev->evtchndev);
             g_free(xendev);
             return NULL;
@@ -309,7 +154,7 @@ static struct XenDevice *xen_be_get_xendev(const char *type, int dom, int dev,
         xendev->gnttabdev = NULL;
     }
 
-    QTAILQ_INSERT_TAIL(&xendevs, xendev, next);
+    xen_pv_insert_xendev(xendev);
 
     if (xendev->ops->alloc) {
         xendev->ops->alloc(xendev);
@@ -318,32 +163,6 @@ static struct XenDevice *xen_be_get_xendev(const char *type, int dom, int dev,
     return xendev;
 }
 
-/*
- * release xen backend device.
- */
-static void xen_be_del_xendev(struct XenDevice *xendev)
-{
-    if (xendev->ops->free) {
-        xendev->ops->free(xendev);
-    }
-
-    if (xendev->fe) {
-        char token[XEN_BUFSIZE];
-        snprintf(token, sizeof(token), "fe:%p", xendev);
-        xs_unwatch(xenstore, xendev->fe, token);
-        g_free(xendev->fe);
-    }
-
-    if (xendev->evtchndev != NULL) {
-        xenevtchn_close(xendev->evtchndev);
-    }
-    if (xendev->gnttabdev != NULL) {
-        xengnttab_close(xendev->gnttabdev);
-    }
-
-    QTAILQ_REMOVE(&xendevs, xendev, next);
-    g_free(xendev);
-}
 
 /*
  * Sync internal data structures on xenstore updates.
@@ -359,7 +178,7 @@ static void xen_be_backend_changed(struct XenDevice *xendev, const char *node)
     }
 
     if (node) {
-        xen_be_printf(xendev, 2, "backend update: %s\n", node);
+        xen_pv_printf(xendev, 2, "backend update: %s\n", node);
         if (xendev->ops->backend_changed) {
             xendev->ops->backend_changed(xendev, node);
         }
@@ -375,7 +194,7 @@ static void xen_be_frontend_changed(struct XenDevice *xendev, const char *node)
             fe_state = XenbusStateUnknown;
         }
         if (xendev->fe_state != fe_state) {
-            xen_be_printf(xendev, 1, "frontend state: %s -> %s\n",
+            xen_pv_printf(xendev, 1, "frontend state: %s -> %s\n",
                           xenbus_strstate(xendev->fe_state),
                           xenbus_strstate(fe_state));
         }
@@ -385,12 +204,13 @@ static void xen_be_frontend_changed(struct XenDevice *xendev, const char *node)
         g_free(xendev->protocol);
         xendev->protocol = xenstore_read_fe_str(xendev, "protocol");
         if (xendev->protocol) {
-            xen_be_printf(xendev, 1, "frontend protocol: %s\n", xendev->protocol);
+            xen_pv_printf(xendev, 1, "frontend protocol: %s\n",
+                          xendev->protocol);
         }
     }
 
     if (node) {
-        xen_be_printf(xendev, 2, "frontend update: %s\n", node);
+        xen_pv_printf(xendev, 2, "frontend update: %s\n", node);
         if (xendev->ops->frontend_changed) {
             xendev->ops->frontend_changed(xendev, node);
         }
@@ -414,26 +234,26 @@ static int xen_be_try_setup(struct XenDevice *xendev)
     int be_state;
 
     if (xenstore_read_be_int(xendev, "state", &be_state) == -1) {
-        xen_be_printf(xendev, 0, "reading backend state failed\n");
+        xen_pv_printf(xendev, 0, "reading backend state failed\n");
         return -1;
     }
 
     if (be_state != XenbusStateInitialising) {
-        xen_be_printf(xendev, 0, "initial backend state is wrong (%s)\n",
+        xen_pv_printf(xendev, 0, "initial backend state is wrong (%s)\n",
                       xenbus_strstate(be_state));
         return -1;
     }
 
     xendev->fe = xenstore_read_be_str(xendev, "frontend");
     if (xendev->fe == NULL) {
-        xen_be_printf(xendev, 0, "reading frontend path failed\n");
+        xen_pv_printf(xendev, 0, "reading frontend path failed\n");
         return -1;
     }
 
     /* setup frontend watch */
     snprintf(token, sizeof(token), "fe:%p", xendev);
     if (!xs_watch(xenstore, xendev->fe, token)) {
-        xen_be_printf(xendev, 0, "watching frontend path (%s) failed\n",
+        xen_pv_printf(xendev, 0, "watching frontend path (%s) failed\n",
                       xendev->fe);
         return -1;
     }
@@ -457,7 +277,7 @@ static int xen_be_try_init(struct XenDevice *xendev)
     int rc = 0;
 
     if (!xendev->online) {
-        xen_be_printf(xendev, 1, "not online\n");
+        xen_pv_printf(xendev, 1, "not online\n");
         return -1;
     }
 
@@ -465,7 +285,7 @@ static int xen_be_try_init(struct XenDevice *xendev)
         rc = xendev->ops->init(xendev);
     }
     if (rc != 0) {
-        xen_be_printf(xendev, 1, "init() failed\n");
+        xen_pv_printf(xendev, 1, "init() failed\n");
         return rc;
     }
 
@@ -488,9 +308,9 @@ static int xen_be_try_initialise(struct XenDevice *xendev)
     if (xendev->fe_state != XenbusStateInitialised  &&
         xendev->fe_state != XenbusStateConnected) {
         if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) {
-            xen_be_printf(xendev, 2, "frontend not ready, ignoring\n");
+            xen_pv_printf(xendev, 2, "frontend not ready, ignoring\n");
         } else {
-            xen_be_printf(xendev, 2, "frontend not ready (yet)\n");
+            xen_pv_printf(xendev, 2, "frontend not ready (yet)\n");
             return -1;
         }
     }
@@ -499,7 +319,7 @@ static int xen_be_try_initialise(struct XenDevice *xendev)
         rc = xendev->ops->initialise(xendev);
     }
     if (rc != 0) {
-        xen_be_printf(xendev, 0, "initialise() failed\n");
+        xen_pv_printf(xendev, 0, "initialise() failed\n");
         return rc;
     }
 
@@ -520,9 +340,9 @@ static void xen_be_try_connected(struct XenDevice *xendev)
 
     if (xendev->fe_state != XenbusStateConnected) {
         if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) {
-            xen_be_printf(xendev, 2, "frontend not ready, ignoring\n");
+            xen_pv_printf(xendev, 2, "frontend not ready, ignoring\n");
         } else {
-            xen_be_printf(xendev, 2, "frontend not ready (yet)\n");
+            xen_pv_printf(xendev, 2, "frontend not ready (yet)\n");
             return;
         }
     }
@@ -556,7 +376,7 @@ static int xen_be_try_reset(struct XenDevice *xendev)
         return -1;
     }
 
-    xen_be_printf(xendev, 1, "device reset (for re-connect)\n");
+    xen_pv_printf(xendev, 1, "device reset (for re-connect)\n");
     xen_be_set_state(xendev, XenbusStateInitialising);
     return 0;
 }
@@ -617,7 +437,8 @@ static int xenstore_scan(const char *type, int dom, struct XenDevOps *ops)
     snprintf(token, sizeof(token), "be:%p:%d:%p", type, dom, ops);
     snprintf(path, sizeof(path), "backend/%s/%d", type, dom);
     if (!xs_watch(xenstore, path, token)) {
-        xen_be_printf(NULL, 0, "xen be: watching backend path (%s) failed\n", path);
+        xen_pv_printf(NULL, 0, "xen be: watching backend path (%s) failed\n",
+                      path);
         return -1;
     }
 
@@ -637,8 +458,8 @@ static int xenstore_scan(const char *type, int dom, struct XenDevOps *ops)
     return 0;
 }
 
-static void xenstore_update_be(char *watch, char *type, int dom,
-                               struct XenDevOps *ops)
+void xenstore_update_be(char *watch, char *type, int dom,
+                        struct XenDevOps *ops)
 {
     struct XenDevice *xendev;
     char path[XEN_BUFSIZE], *bepath;
@@ -662,7 +483,7 @@ static void xenstore_update_be(char *watch, char *type, int dom,
     if (xendev != NULL) {
         bepath = xs_read(xenstore, 0, xendev->be, &len);
         if (bepath == NULL) {
-            xen_be_del_xendev(xendev);
+            xen_pv_del_xendev(xendev);
         } else {
             free(bepath);
             xen_be_backend_changed(xendev, path);
@@ -671,7 +492,7 @@ static void xenstore_update_be(char *watch, char *type, int dom,
     }
 }
 
-static void xenstore_update_fe(char *watch, struct XenDevice *xendev)
+void xenstore_update_fe(char *watch, struct XenDevice *xendev)
 {
     char *node;
     unsigned int len;
@@ -688,56 +509,13 @@ static void xenstore_update_fe(char *watch, struct XenDevice *xendev)
     xen_be_frontend_changed(xendev, node);
     xen_be_check_state(xendev);
 }
-
-static void xenstore_update(void *unused)
-{
-    char **vec = NULL;
-    intptr_t type, ops, ptr;
-    unsigned int dom, count;
-
-    vec = xs_read_watch(xenstore, &count);
-    if (vec == NULL) {
-        goto cleanup;
-    }
-
-    if (sscanf(vec[XS_WATCH_TOKEN], "be:%" PRIxPTR ":%d:%" PRIxPTR,
-               &type, &dom, &ops) == 3) {
-        xenstore_update_be(vec[XS_WATCH_PATH], (void*)type, dom, (void*)ops);
-    }
-    if (sscanf(vec[XS_WATCH_TOKEN], "fe:%" PRIxPTR, &ptr) == 1) {
-        xenstore_update_fe(vec[XS_WATCH_PATH], (void*)ptr);
-    }
-
-cleanup:
-    free(vec);
-}
-
-static void xen_be_evtchn_event(void *opaque)
-{
-    struct XenDevice *xendev = opaque;
-    evtchn_port_t port;
-
-    port = xenevtchn_pending(xendev->evtchndev);
-    if (port != xendev->local_port) {
-        xen_be_printf(xendev, 0,
-                      "xenevtchn_pending returned %d (expected %d)\n",
-                      port, xendev->local_port);
-        return;
-    }
-    xenevtchn_unmask(xendev->evtchndev, port);
-
-    if (xendev->ops->event) {
-        xendev->ops->event(xendev);
-    }
-}
-
 /* -------------------------------------------------------------------- */
 
 int xen_be_init(void)
 {
     xenstore = xs_daemon_open();
     if (!xenstore) {
-        xen_be_printf(NULL, 0, "can't connect to xenstored\n");
+        xen_pv_printf(NULL, 0, "can't connect to xenstored\n");
         return -1;
     }
 
@@ -798,69 +576,15 @@ int xen_be_bind_evtchn(struct XenDevice *xendev)
     xendev->local_port = xenevtchn_bind_interdomain
         (xendev->evtchndev, xendev->dom, xendev->remote_port);
     if (xendev->local_port == -1) {
-        xen_be_printf(xendev, 0, "xenevtchn_bind_interdomain failed\n");
+        xen_pv_printf(xendev, 0, "xenevtchn_bind_interdomain failed\n");
         return -1;
     }
-    xen_be_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port);
+    xen_pv_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port);
     qemu_set_fd_handler(xenevtchn_fd(xendev->evtchndev),
-                        xen_be_evtchn_event, NULL, xendev);
+                        xen_pv_evtchn_event, NULL, xendev);
     return 0;
 }
 
-void xen_be_unbind_evtchn(struct XenDevice *xendev)
-{
-    if (xendev->local_port == -1) {
-        return;
-    }
-    qemu_set_fd_handler(xenevtchn_fd(xendev->evtchndev), NULL, NULL, NULL);
-    xenevtchn_unbind(xendev->evtchndev, xendev->local_port);
-    xen_be_printf(xendev, 2, "unbind evtchn port %d\n", xendev->local_port);
-    xendev->local_port = -1;
-}
-
-int xen_be_send_notify(struct XenDevice *xendev)
-{
-    return xenevtchn_notify(xendev->evtchndev, xendev->local_port);
-}
-
-/*
- * msg_level:
- *  0 == errors (stderr + logfile).
- *  1 == informative debug messages (logfile only).
- *  2 == noisy debug messages (logfile only).
- *  3 == will flood your log (logfile only).
- */
-void xen_be_printf(struct XenDevice *xendev, int msg_level, const char *fmt, ...)
-{
-    va_list args;
-
-    if (xendev) {
-        if (msg_level > xendev->debug) {
-            return;
-        }
-        qemu_log("xen be: %s: ", xendev->name);
-        if (msg_level == 0) {
-            fprintf(stderr, "xen be: %s: ", xendev->name);
-        }
-    } else {
-        if (msg_level > debug) {
-            return;
-        }
-        qemu_log("xen be core: ");
-        if (msg_level == 0) {
-            fprintf(stderr, "xen be core: ");
-        }
-    }
-    va_start(args, fmt);
-    qemu_log_vprintf(fmt, args);
-    va_end(args);
-    if (msg_level == 0) {
-        va_start(args, fmt);
-        vfprintf(stderr, fmt, args);
-        va_end(args);
-    }
-    qemu_log_flush();
-}
 
 static int xen_sysdev_init(SysBusDevice *dev)
 {
diff --git a/hw/xen/xen_devconfig.c b/hw/xen/xen_devconfig.c
index b7d290d..a80e78c 100644
--- a/hw/xen/xen_devconfig.c
+++ b/hw/xen/xen_devconfig.c
@@ -55,7 +55,7 @@ int xen_config_dev_blk(DriveInfo *disk)
     const char *filename = qemu_opt_get(disk->opts, "file");
 
     snprintf(device_name, sizeof(device_name), "xvd%c", 'a' + disk->unit);
-    xen_be_printf(NULL, 1, "config disk %d [%s]: %s\n",
+    xen_pv_printf(NULL, 1, "config disk %d [%s]: %s\n",
                   disk->unit, device_name, filename);
     xen_config_dev_dirs("vbd", "qdisk", vdev, fe, be, sizeof(fe));
 
@@ -83,7 +83,7 @@ int xen_config_dev_nic(NICInfo *nic)
     snprintf(mac, sizeof(mac), "%02x:%02x:%02x:%02x:%02x:%02x",
              nic->macaddr.a[0], nic->macaddr.a[1], nic->macaddr.a[2],
              nic->macaddr.a[3], nic->macaddr.a[4], nic->macaddr.a[5]);
-    xen_be_printf(NULL, 1, "config nic %d: mac=\"%s\"\n", vlan_id, mac);
+    xen_pv_printf(NULL, 1, "config nic %d: mac=\"%s\"\n", vlan_id, mac);
     xen_config_dev_dirs("vif", "qnic", vlan_id, fe, be, sizeof(fe));
 
     /* frontend */
diff --git a/hw/xen/xen_pvdev.c b/hw/xen/xen_pvdev.c
new file mode 100644
index 0000000..405e154
--- /dev/null
+++ b/hw/xen/xen_pvdev.c
@@ -0,0 +1,316 @@
+/*
+ * Xen para-virtualization device
+ *
+ *  (c) 2008 Gerd Hoffmann <kraxel@redhat.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>
+ */
+
+#include "qemu/osdep.h"
+
+#include "hw/xen/xen_backend.h"
+#include "hw/xen/xen_pvdev.h"
+
+/* private */
+static int debug;
+
+struct xs_dirs {
+    char *xs_dir;
+    QTAILQ_ENTRY(xs_dirs) list;
+};
+
+static QTAILQ_HEAD(xs_dirs_head, xs_dirs) xs_cleanup =
+    QTAILQ_HEAD_INITIALIZER(xs_cleanup);
+
+static QTAILQ_HEAD(XenDeviceHead, XenDevice) xendevs =
+    QTAILQ_HEAD_INITIALIZER(xendevs);
+
+/* ------------------------------------------------------------- */
+
+static void xenstore_cleanup_dir(char *dir)
+{
+    struct xs_dirs *d;
+
+    d = g_malloc(sizeof(*d));
+    d->xs_dir = dir;
+    QTAILQ_INSERT_TAIL(&xs_cleanup, d, list);
+}
+
+void xen_config_cleanup(void)
+{
+    struct xs_dirs *d;
+
+    QTAILQ_FOREACH(d, &xs_cleanup, list) {
+        xs_rm(xenstore, 0, d->xs_dir);
+    }
+}
+
+int xenstore_mkdir(char *path, int p)
+{
+    struct xs_permissions perms[2] = {
+        {
+            .id    = 0, /* set owner: dom0 */
+        }, {
+            .id    = xen_domid,
+            .perms = p,
+        }
+    };
+
+    if (!xs_mkdir(xenstore, 0, path)) {
+        xen_pv_printf(NULL, 0, "xs_mkdir %s: failed\n", path);
+        return -1;
+    }
+    xenstore_cleanup_dir(g_strdup(path));
+
+    if (!xs_set_permissions(xenstore, 0, path, perms, 2)) {
+        xen_pv_printf(NULL, 0, "xs_set_permissions %s: failed\n", path);
+        return -1;
+    }
+    return 0;
+}
+
+int xenstore_write_str(const char *base, const char *node, const char *val)
+{
+    char abspath[XEN_BUFSIZE];
+
+    snprintf(abspath, sizeof(abspath), "%s/%s", base, node);
+    if (!xs_write(xenstore, 0, abspath, val, strlen(val))) {
+        return -1;
+    }
+    return 0;
+}
+
+char *xenstore_read_str(const char *base, const char *node)
+{
+    char abspath[XEN_BUFSIZE];
+    unsigned int len;
+    char *str, *ret = NULL;
+
+    snprintf(abspath, sizeof(abspath), "%s/%s", base, node);
+    str = xs_read(xenstore, 0, abspath, &len);
+    if (str != NULL) {
+        /* move to qemu-allocated memory to make sure
+         * callers can savely g_free() stuff. */
+        ret = g_strdup(str);
+        free(str);
+    }
+    return ret;
+}
+
+int xenstore_write_int(const char *base, const char *node, int ival)
+{
+    char val[12];
+
+    snprintf(val, sizeof(val), "%d", ival);
+    return xenstore_write_str(base, node, val);
+}
+
+int xenstore_write_int64(const char *base, const char *node, int64_t ival)
+{
+    char val[21];
+
+    snprintf(val, sizeof(val), "%"PRId64, ival);
+    return xenstore_write_str(base, node, val);
+}
+
+int xenstore_read_int(const char *base, const char *node, int *ival)
+{
+    char *val;
+    int rc = -1;
+
+    val = xenstore_read_str(base, node);
+    if (val && 1 == sscanf(val, "%d", ival)) {
+        rc = 0;
+    }
+    g_free(val);
+    return rc;
+}
+
+int xenstore_read_uint64(const char *base, const char *node, uint64_t *uval)
+{
+    char *val;
+    int rc = -1;
+
+    val = xenstore_read_str(base, node);
+    if (val && 1 == sscanf(val, "%"SCNu64, uval)) {
+        rc = 0;
+    }
+    g_free(val);
+    return rc;
+}
+
+void xenstore_update(void *unused)
+{
+    char **vec = NULL;
+    intptr_t type, ops, ptr;
+    unsigned int dom, count;
+
+    vec = xs_read_watch(xenstore, &count);
+    if (vec == NULL) {
+        goto cleanup;
+    }
+
+    if (sscanf(vec[XS_WATCH_TOKEN], "be:%" PRIxPTR ":%d:%" PRIxPTR,
+               &type, &dom, &ops) == 3) {
+        xenstore_update_be(vec[XS_WATCH_PATH], (void *)type, dom, (void*)ops);
+    }
+    if (sscanf(vec[XS_WATCH_TOKEN], "fe:%" PRIxPTR, &ptr) == 1) {
+        xenstore_update_fe(vec[XS_WATCH_PATH], (void *)ptr);
+    }
+
+cleanup:
+    free(vec);
+}
+
+const char *xenbus_strstate(enum xenbus_state state)
+{
+    static const char *const name[] = {
+        [XenbusStateUnknown]       = "Unknown",
+        [XenbusStateInitialising]  = "Initialising",
+        [XenbusStateInitWait]      = "InitWait",
+        [XenbusStateInitialised]   = "Initialised",
+        [XenbusStateConnected]     = "Connected",
+        [XenbusStateClosing]       = "Closing",
+        [XenbusStateClosed]        = "Closed",
+    };
+    return (state < ARRAY_SIZE(name)) ? name[state] : "INVALID";
+}
+
+/*
+ * msg_level:
+ *  0 == errors (stderr + logfile).
+ *  1 == informative debug messages (logfile only).
+ *  2 == noisy debug messages (logfile only).
+ *  3 == will flood your log (logfile only).
+ */
+void xen_pv_printf(struct XenDevice *xendev, int msg_level,
+                   const char *fmt, ...)
+{
+    va_list args;
+
+    if (xendev) {
+        if (msg_level > xendev->debug) {
+            return;
+        }
+        qemu_log("xen be: %s: ", xendev->name);
+        if (msg_level == 0) {
+            fprintf(stderr, "xen be: %s: ", xendev->name);
+        }
+    } else {
+        if (msg_level > debug) {
+            return;
+        }
+        qemu_log("xen be core: ");
+        if (msg_level == 0) {
+            fprintf(stderr, "xen be core: ");
+        }
+    }
+    va_start(args, fmt);
+    qemu_log_vprintf(fmt, args);
+    va_end(args);
+    if (msg_level == 0) {
+        va_start(args, fmt);
+        vfprintf(stderr, fmt, args);
+        va_end(args);
+    }
+    qemu_log_flush();
+}
+
+void xen_pv_evtchn_event(void *opaque)
+{
+    struct XenDevice *xendev = opaque;
+    evtchn_port_t port;
+
+    port = xenevtchn_pending(xendev->evtchndev);
+    if (port != xendev->local_port) {
+        xen_pv_printf(xendev, 0,
+                      "xenevtchn_pending returned %d (expected %d)\n",
+                      port, xendev->local_port);
+        return;
+    }
+    xenevtchn_unmask(xendev->evtchndev, port);
+
+    if (xendev->ops->event) {
+        xendev->ops->event(xendev);
+    }
+}
+
+void xen_pv_unbind_evtchn(struct XenDevice *xendev)
+{
+    if (xendev->local_port == -1) {
+        return;
+    }
+    qemu_set_fd_handler(xenevtchn_fd(xendev->evtchndev), NULL, NULL, NULL);
+    xenevtchn_unbind(xendev->evtchndev, xendev->local_port);
+    xen_pv_printf(xendev, 2, "unbind evtchn port %d\n", xendev->local_port);
+    xendev->local_port = -1;
+}
+
+int xen_pv_send_notify(struct XenDevice *xendev)
+{
+    return xenevtchn_notify(xendev->evtchndev, xendev->local_port);
+}
+
+/* ------------------------------------------------------------- */
+
+struct XenDevice *xen_pv_find_xendev(const char *type, int dom, int dev)
+{
+    struct XenDevice *xendev;
+
+    QTAILQ_FOREACH(xendev, &xendevs, next) {
+        if (xendev->dom != dom) {
+            continue;
+        }
+        if (xendev->dev != dev) {
+            continue;
+        }
+        if (strcmp(xendev->type, type) != 0) {
+            continue;
+        }
+        return xendev;
+    }
+    return NULL;
+}
+
+/*
+ * release xen backend device.
+ */
+void xen_pv_del_xendev(struct XenDevice *xendev)
+{
+    if (xendev->ops->free) {
+        xendev->ops->free(xendev);
+    }
+
+    if (xendev->fe) {
+        char token[XEN_BUFSIZE];
+        snprintf(token, sizeof(token), "fe:%p", xendev);
+        xs_unwatch(xenstore, xendev->fe, token);
+        g_free(xendev->fe);
+    }
+
+    if (xendev->evtchndev != NULL) {
+        xenevtchn_close(xendev->evtchndev);
+    }
+    if (xendev->gnttabdev != NULL) {
+        xengnttab_close(xendev->gnttabdev);
+    }
+
+    QTAILQ_REMOVE(&xendevs, xendev, next);
+    g_free(xendev);
+}
+
+void xen_pv_insert_xendev(struct XenDevice *xendev)
+{
+    QTAILQ_INSERT_TAIL(&xendevs, xendev, next);
+}