[PATCH V2 11/22] vfio-pci: refactor for cpr

[Steve Sistare <steven.sistare@oracle.com>]

Export vfio_address_spaces and vfio_listener_skipped_section.
Add optional eventfd arg to vfio_add_kvm_msi_virq.
Refactor vector use into a helper vfio_vector_init.
All for use by cpr in a subsequent patch.  No functional change.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
---
 hw/vfio/common.c              |  4 ++--
 hw/vfio/pci.c                 | 36 +++++++++++++++++++++++++-----------
 include/hw/vfio/vfio-common.h |  3 +++
 3 files changed, 30 insertions(+), 13 deletions(-)

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 3335714..7f8768d 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -40,7 +40,7 @@
 
 VFIOGroupList vfio_group_list =
     QLIST_HEAD_INITIALIZER(vfio_group_list);
-static QLIST_HEAD(, VFIOAddressSpace) vfio_address_spaces =
+VFIOAddressSpaceList vfio_address_spaces =
     QLIST_HEAD_INITIALIZER(vfio_address_spaces);
 
 #ifdef CONFIG_KVM
@@ -393,7 +393,7 @@ static int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova,
     return -1;
 }
 
-static bool vfio_listener_skipped_section(MemoryRegionSection *section)
+bool vfio_listener_skipped_section(MemoryRegionSection *section)
 {
     return (!memory_region_is_ram(section->mr) &&
             !memory_region_is_iommu(section->mr)) ||
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 2e561c0..9b57ffa 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -412,7 +412,7 @@ static int vfio_enable_vectors(VFIOPCIDevice *vdev, bool msix)
 }
 
 static void vfio_add_kvm_msi_virq(VFIOPCIDevice *vdev, VFIOMSIVector *vector,
-                                  int vector_n, bool msix)
+                                  int vector_n, bool msix, int eventfd)
 {
     int virq;
 
@@ -420,7 +420,9 @@ static void vfio_add_kvm_msi_virq(VFIOPCIDevice *vdev, VFIOMSIVector *vector,
         return;
     }
 
-    if (event_notifier_init(&vector->kvm_interrupt, 0)) {
+    if (eventfd >= 0) {
+        event_notifier_init_fd(&vector->kvm_interrupt, eventfd);
+    } else if (event_notifier_init(&vector->kvm_interrupt, 0)) {
         return;
     }
 
@@ -456,6 +458,22 @@ static void vfio_update_kvm_msi_virq(VFIOMSIVector *vector, MSIMessage msg,
     kvm_irqchip_commit_routes(kvm_state);
 }
 
+static void vfio_vector_init(VFIOPCIDevice *vdev, int nr, int eventfd)
+{
+    VFIOMSIVector *vector = &vdev->msi_vectors[nr];
+    PCIDevice *pdev = &vdev->pdev;
+
+    vector->vdev = vdev;
+    vector->virq = -1;
+    if (eventfd >= 0) {
+        event_notifier_init_fd(&vector->interrupt, eventfd);
+    } else if (event_notifier_init(&vector->interrupt, 0)) {
+        error_report("vfio: Error: event_notifier_init failed");
+    }
+    vector->use = true;
+    msix_vector_use(pdev, nr);
+}
+
 static int vfio_msix_vector_do_use(PCIDevice *pdev, unsigned int nr,
                                    MSIMessage *msg, IOHandler *handler)
 {
@@ -467,14 +485,10 @@ static int vfio_msix_vector_do_use(PCIDevice *pdev, unsigned int nr,
 
     vector = &vdev->msi_vectors[nr];
 
+    vfio_vector_init(vdev, nr, -1);
+
     if (!vector->use) {
-        vector->vdev = vdev;
-        vector->virq = -1;
-        if (event_notifier_init(&vector->interrupt, 0)) {
-            error_report("vfio: Error: event_notifier_init failed");
-        }
-        vector->use = true;
-        msix_vector_use(pdev, nr);
+        vfio_vector_init(vdev, nr, -1);
     }
 
     qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt),
@@ -492,7 +506,7 @@ static int vfio_msix_vector_do_use(PCIDevice *pdev, unsigned int nr,
         }
     } else {
         if (msg) {
-            vfio_add_kvm_msi_virq(vdev, vector, nr, true);
+            vfio_add_kvm_msi_virq(vdev, vector, nr, true, -1);
         }
     }
 
@@ -628,7 +642,7 @@ retry:
          * Attempt to enable route through KVM irqchip,
          * default to userspace handling if unavailable.
          */
-        vfio_add_kvm_msi_virq(vdev, vector, i, false);
+        vfio_add_kvm_msi_virq(vdev, vector, i, false, -1);
     }
 
     /* Set interrupt type prior to possible interrupts */
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index c78f3ff..ab87df4 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -182,6 +182,8 @@ int vfio_get_device(VFIOGroup *group, const char *name,
 extern const MemoryRegionOps vfio_region_ops;
 typedef QLIST_HEAD(VFIOGroupList, VFIOGroup) VFIOGroupList;
 extern VFIOGroupList vfio_group_list;
+typedef QLIST_HEAD(, VFIOAddressSpace) VFIOAddressSpaceList;
+extern VFIOAddressSpaceList vfio_address_spaces;
 
 #ifdef CONFIG_LINUX
 int vfio_get_region_info(VFIODevice *vbasedev, int index,
@@ -193,6 +195,7 @@ struct vfio_info_cap_header *
 vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id);
 #endif
 extern const MemoryListener vfio_prereg_listener;
+bool vfio_listener_skipped_section(MemoryRegionSection *section);
 
 int vfio_spapr_create_window(VFIOContainer *container,
                              MemoryRegionSection *section,
-- 
1.8.3.1