don't trigger INTx IRQ if it's disabled

Signed-off-by: Thanos Makatos <thanos.makatos@nutanix.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/lib/libmuser.c b/lib/libmuser.c
index 8299840..795fff6 100644
--- a/lib/libmuser.c
+++ b/lib/libmuser.c
@@ -1002,6 +1002,21 @@ lm_irq_trigger(lm_ctx_t * lm_ctx, uint32_t vector)
         return -1;
     }
 
+    if (vector == LM_DEV_INTX_IRQ_IDX && !lm_ctx->pci_config_space->hdr.cmd.id) {
+        lm_log(lm_ctx, LM_ERR, "failed to trigger INTx IRQ, INTx disabled\n");
+        errno = EINVAL;
+        return -1;
+    } else if (vector == LM_DEV_MSIX_IRQ_IDX) {
+        /*
+         * FIXME must check that MSI-X capability exists during creation time
+         */
+        /*
+         * FIXME need to check that MSI-X is enabled and that it's not masked.
+         * Currently that's not possible because libmuser doesn't care about
+         * the internals of a capability.
+         */
+    }
+
     return eventfd_write(lm_ctx->irqs.efds[vector], val);
 }