libxl: fix cold plugged PCI device with stubdomain

When libxl__device_pci_add() is called, stubdomain is already running,
even when still constructing the target domain. Previously, do_pci_add()
was called with 'starting' hardcoded to false, but now do_pci_add() shares
'starting' flag in pci_add_state for both target domain and stubdomain.

Fix this by resetting (local) 'starting' to false in pci_add_dm_done()
(previously part of do_pci_add()) when handling stubdomain, regardless
of pas->starting value.

Fixes: 11db56f9a6 (libxl_pci: Use libxl__ao_device with libxl__device_pci_add)
Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Release-acked-by: Juergen Gross <jgross@suse.com>

diff --git a/tools/libxl/libxl_pci.c b/tools/libxl/libxl_pci.c
index cb849b241581f361945b3ce9741a5c2612f866e2..eae086e503efd258a73c90ea60b42dbbf6cbd05f 100644 (file)
--- a/tools/libxl/libxl_pci.c
+++ b/tools/libxl/libxl_pci.c
@@ -1300,6 +1300,10 @@ static void pci_add_dm_done(libxl__egc *egc,
 
     if (rc) goto out;
 
+    /* stubdomain is always running by now, even at create time */
+    if (isstubdom)
+        starting = false;
+
     sysfs_path = GCSPRINTF(SYSFS_PCI_DEV"/"PCI_BDF"/resource", pcidev->domain,
                            pcidev->bus, pcidev->dev, pcidev->func);
     f = fopen(sysfs_path, "r");
@@ -1559,7 +1563,6 @@ void libxl__device_pci_add(libxl__egc *egc, uint32_t domid,
         GCNEW(pcidev_s);
         libxl_device_pci_init(pcidev_s);
         libxl_device_pci_copy(CTX, pcidev_s, pcidev);
-        /* stubdomain is always running by now, even at create time */
         pas->callback = device_pci_add_stubdom_done;
         do_pci_add(egc, stubdomid, pcidev_s, pas); /* must be last */
         return;