[RFC PATCH v2 4/7] util/vfio-helpers: Check the device allow up to 'irq_count' IRQs

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

As we want to use more than one single IRQ, add a check that
the device accept our request to use multiple IRQs.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 util/vfio-helpers.c | 6 ++++++
 util/trace-events   | 1 +
 2 files changed, 7 insertions(+)

diff --git a/util/vfio-helpers.c b/util/vfio-helpers.c
index bad60076f3..b81d4c70c2 100644
--- a/util/vfio-helpers.c
+++ b/util/vfio-helpers.c
@@ -335,6 +335,12 @@ static int qemu_vfio_init_pci(QEMUVFIOState *s, const char *device,
         ret = -errno;
         goto fail;
     }
+    trace_qemu_vfio_init_pci(device_info.num_irqs);
+    if (device_info.num_irqs < irq_count) {
+        error_setg(errp, "Invalid device IRQ count");
+        ret = -EINVAL;
+        goto fail;
+    }
     s->irq_type = irq_type;
     s->irq_count = irq_count;
 
diff --git a/util/trace-events b/util/trace-events
index 0ce42822eb..2e85555be3 100644
--- a/util/trace-events
+++ b/util/trace-events
@@ -83,3 +83,4 @@ qemu_vfio_new_mapping(void *s, void *host, size_t size, int index, uint64_t iova
 qemu_vfio_do_mapping(void *s, void *host, size_t size, uint64_t iova) "s %p host %p size %zu iova 0x%"PRIx64
 qemu_vfio_dma_map(void *s, void *host, size_t size, bool temporary, uint64_t *iova) "s %p host %p size %zu temporary %d iova %p"
 qemu_vfio_dma_unmap(void *s, void *host) "s %p host %p"
+qemu_vfio_init_pci(uint32_t count) "device interrupt count: %"PRIu32
-- 
2.21.3