[Qemu-devel] [PATCH] virtio: Notice when the system doesn't support MSIx at all

[Richard Henderson]

And do not issue an error_report in that case.

Signed-off-by: Richard Henderson <r...@twiddle.net>
---
 hw/virtio/virtio-pci.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)
--

This seems to be about the only sane way to test the value of
msi_supported from here.  Thoughts?


r~



diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 867c9d1..6763872 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -934,11 +934,16 @@ static void virtio_pci_device_plugged(DeviceState *d)
     pci_set_word(config + PCI_SUBSYSTEM_ID, virtio_bus_get_vdev_id(bus));
     config[PCI_INTERRUPT_PIN] = 1;
 
-    if (proxy->nvectors &&
-        msix_init_exclusive_bar(&proxy->pci_dev, proxy->nvectors, 1)) {
-        error_report("unable to init msix vectors to %" PRIu32,
-                     proxy->nvectors);
-        proxy->nvectors = 0;
+    if (proxy->nvectors) {
+        int err = msix_init_exclusive_bar(&proxy->pci_dev, proxy->nvectors, 1);
+        if (err) {
+            /* Notice when a system that supports MSIx can't initialize it.  */
+            if (err != -ENOTSUP) {
+                error_report("unable to init msix vectors to %" PRIu32,
+                             proxy->nvectors);
+            }
+            proxy->nvectors = 0;
+        }
     }
 
     proxy->pci_dev.config_write = virtio_write_config;
-- 
2.1.0