[RFC PATCH v2 7/7] util/vfio-helpers: Allow opening device requesting for multiple IRQs

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

Now that our helper is ready for handling multiple IRQs, let
qemu_vfio_open_pci() take an 'irq_count' argument.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 include/qemu/vfio-helpers.h | 2 +-
 block/nvme.c                | 5 ++++-
 util/vfio-helpers.c         | 4 ++--
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/include/qemu/vfio-helpers.h b/include/qemu/vfio-helpers.h
index 5c2d8ee5b3..4773b116df 100644
--- a/include/qemu/vfio-helpers.h
+++ b/include/qemu/vfio-helpers.h
@@ -16,7 +16,7 @@
 typedef struct QEMUVFIOState QEMUVFIOState;
 
 QEMUVFIOState *qemu_vfio_open_pci(const char *device, int irq_type,
-                                  Error **errp);
+                                  unsigned irq_count, Error **errp);
 void qemu_vfio_close(QEMUVFIOState *s);
 int qemu_vfio_dma_map(QEMUVFIOState *s, void *host, size_t size,
                       bool temporary, uint64_t *iova_list);
diff --git a/block/nvme.c b/block/nvme.c
index a5ef571492..2d7aac3903 100644
--- a/block/nvme.c
+++ b/block/nvme.c
@@ -106,6 +106,9 @@ QEMU_BUILD_BUG_ON(offsetof(NVMeRegs, doorbells) != 0x1000);
 #define INDEX_ADMIN     0
 #define INDEX_IO(n)     (1 + n)
 
+/* This driver shares a single MSIX IRQ for the admin and I/O queues */
+#define MSIX_IRQ_COUNT  1
+
 struct BDRVNVMeState {
     AioContext *aio_context;
     QEMUVFIOState *vfio;
@@ -712,7 +715,7 @@ static int nvme_init(BlockDriverState *bs, const char *device, int namespace,
     }
 
     s->vfio = qemu_vfio_open_pci(device, VFIO_PCI_MSIX_IRQ_INDEX,
-                                 errp);
+                                 MSIX_IRQ_COUNT, errp);
     if (!s->vfio) {
         ret = -EINVAL;
         goto out;
diff --git a/util/vfio-helpers.c b/util/vfio-helpers.c
index 7a934d1a1b..36fafef0d3 100644
--- a/util/vfio-helpers.c
+++ b/util/vfio-helpers.c
@@ -450,12 +450,12 @@ static void qemu_vfio_open_common(QEMUVFIOState *s)
  * Open a PCI device, e.g. "0000:00:01.0".
  */
 QEMUVFIOState *qemu_vfio_open_pci(const char *device, int irq_type,
-                                  Error **errp)
+                                  unsigned irq_count, Error **errp)
 {
     int r;
     QEMUVFIOState *s = g_new0(QEMUVFIOState, 1);
 
-    r = qemu_vfio_init_pci(s, device, irq_type, 1, errp);
+    r = qemu_vfio_init_pci(s, device, irq_type, irq_count, errp);
     if (r) {
         g_free(s);
         return NULL;
-- 
2.21.3