[PATCH V6 18/27] vfio-pci: refactor for cpr

[Steve Sistare]

Export vfio_address_spaces and vfio_listener_skipped_section.
Add optional name 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                 | 50 +++++++++++++++++++++++++++++++------------
 include/hw/vfio/vfio-common.h |  3 +++
 3 files changed, 41 insertions(+), 16 deletions(-)

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 8728d4d..7918c0d 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -43,7 +43,7 @@
 
 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
@@ -558,7 +558,7 @@ 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 e1ea1d8..e8e371e 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -48,6 +48,20 @@
 static void vfio_disable_interrupts(VFIOPCIDevice *vdev);
 static void vfio_mmap_set_enabled(VFIOPCIDevice *vdev, bool enabled);
 
+/* Create new or reuse existing eventfd */
+static int vfio_named_notifier_init(VFIOPCIDevice *vdev, EventNotifier *e,
+                                    const char *name, int nr)
+{
+    int fd = -1;   /* placeholder until a subsequent patch */
+
+    if (fd >= 0) {
+        event_notifier_init_fd(e, fd);
+        return 0;
+    } else {
+        return event_notifier_init(e, 0);
+    }
+}
+
 /*
  * Disabling BAR mmaping can be slow, but toggling it around INTx can
  * also be a huge overhead.  We try to get the best of both worlds by
@@ -410,7 +424,7 @@ 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)
+                                  const char *name, int nr, bool msix)
 {
     int virq;
 
@@ -418,11 +432,11 @@ static void vfio_add_kvm_msi_virq(VFIOPCIDevice *vdev, 
VFIOMSIVector *vector,
         return;
     }
 
-    if (event_notifier_init(&vector->kvm_interrupt, 0)) {
+    if (vfio_named_notifier_init(vdev, &vector->kvm_interrupt, name, nr)) {
         return;
     }
 
-    virq = kvm_irqchip_add_msi_route(kvm_state, vector_n, &vdev->pdev);
+    virq = kvm_irqchip_add_msi_route(kvm_state, nr, &vdev->pdev);
     if (virq < 0) {
         event_notifier_cleanup(&vector->kvm_interrupt);
         return;
@@ -454,6 +468,20 @@ static void vfio_update_kvm_msi_virq(VFIOMSIVector 
*vector, MSIMessage msg,
     kvm_irqchip_commit_routes(kvm_state);
 }
 
+static void vfio_vector_init(VFIOPCIDevice *vdev, const char *name, int nr)
+{
+    VFIOMSIVector *vector = &vdev->msi_vectors[nr];
+    PCIDevice *pdev = &vdev->pdev;
+
+    vector->vdev = vdev;
+    vector->virq = -1;
+    if (vfio_named_notifier_init(vdev, &vector->interrupt, name, nr)) {
+        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)
 {
@@ -466,13 +494,7 @@ static int vfio_msix_vector_do_use(PCIDevice *pdev, 
unsigned int nr,
     vector = &vdev->msi_vectors[nr];
 
     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, NULL, nr);
     }
 
     qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt),
@@ -490,7 +512,7 @@ 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, NULL, nr, true);
         }
     }
 
@@ -640,7 +662,7 @@ 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, NULL, i, false);
     }
 
     /* Set interrupt type prior to possible interrupts */
@@ -2677,7 +2699,7 @@ static void vfio_register_err_notifier(VFIOPCIDevice 
*vdev)
         return;
     }
 
-    if (event_notifier_init(&vdev->err_notifier, 0)) {
+    if (vfio_named_notifier_init(vdev, &vdev->err_notifier, "err", 0)) {
         error_report("vfio: Unable to init event notifier for error 
detection");
         vdev->pci_aer = false;
         return;
@@ -2743,7 +2765,7 @@ static void vfio_register_req_notifier(VFIOPCIDevice 
*vdev)
         return;
     }
 
-    if (event_notifier_init(&vdev->req_notifier, 0)) {
+    if (vfio_named_notifier_init(vdev, &vdev->req_notifier, "req", 0)) {
         error_report("vfio: Unable to init event notifier for device request");
         return;
     }
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 8af11b0..cb04cc6 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -216,6 +216,8 @@ 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;
 
 bool vfio_mig_active(void);
 int64_t vfio_mig_bytes_transferred(void);
@@ -234,6 +236,7 @@ struct vfio_info_cap_header *
 vfio_get_device_info_cap(struct vfio_device_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