vfio/quirks: Add quirk reset callback

Quirks can be self modifying, provide a hook to allow them to cleanup
on device reset if desired.
Reviewed-by: NEric Auger <eric.auger@redhat.com>
Reviewed-by: NPeter Xu <peterx@redhat.com>
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>

hw/vfio/pci-quirks.c

@@ -1694,6 +1694,21 @@ void vfio_bar_quirk_finalize(VFIOPCIDevice *vdev, int nr)
 /*
  * Reset quirks
  */
+void vfio_quirk_reset(VFIOPCIDevice *vdev)
+{
+    int i;
+
+    for (i = 0; i < PCI_ROM_SLOT; i++) {
+        VFIOQuirk *quirk;
+        VFIOBAR *bar = &vdev->bars[i];
+
+        QLIST_FOREACH(quirk, &bar->quirks, next) {
+            if (quirk->reset) {
+                quirk->reset(vdev, quirk);
+            }
+        }
+    }
+}
 
 /*
  * AMD Radeon PCI config reset, based on Linux:

hw/vfio/pci.c

@@ -2207,6 +2207,8 @@ static void vfio_pci_post_reset(VFIOPCIDevice *vdev)
                          vdev->vbasedev.name, nr);
         }
     }
+
+    vfio_quirk_reset(vdev);
 }
 
 static bool vfio_pci_host_match(PCIHostDeviceAddress *addr, const char *name)

hw/vfio/pci.h

@@ -29,6 +29,7 @@ typedef struct VFIOQuirk {
     void *data;
     int nr_mem;
     MemoryRegion *mem;
+    void (*reset)(struct VFIOPCIDevice *vdev, struct VFIOQuirk *quirk);
 } VFIOQuirk;
 
 typedef struct VFIOBAR {
@@ -167,6 +168,7 @@ void vfio_bar_quirk_exit(VFIOPCIDevice *vdev, int nr);
 void vfio_bar_quirk_finalize(VFIOPCIDevice *vdev, int nr);
 void vfio_setup_resetfn_quirk(VFIOPCIDevice *vdev);
 int vfio_add_virt_caps(VFIOPCIDevice *vdev, Error **errp);
+void vfio_quirk_reset(VFIOPCIDevice *vdev);
 
 extern const PropertyInfo qdev_prop_nv_gpudirect_clique;