Commit 007cec79b2 for qemu.org

commit 007cec79b2fe5bdfb72748d1dce7a30d35da648a
Author: Aastha Rawat <aastharawat@linux.microsoft.com>
Date:   Thu Apr 9 11:53:07 2026 +0000

    accel/mshv: return correct errno value from ioeventfd failure

    Returning the raw ioctl return value results in misleading error
    message. Ensure that actual failure reason is propagated by returning
    -errno for ioeventfd failure.

    Signed-off-by: Aastha Rawat <aastharawat@linux.microsoft.com>
    Reviewed-by: Magnus Kulke <magnuskulke@linux.microsoft.com>
    Link: https://lore.kernel.org/r/20260409-fix_ioevent-v1-2-053b810ae6fb@linux.microsoft.com
    Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/accel/mshv/mshv-all.c b/accel/mshv/mshv-all.c
index e1a8d62f8d..58af674bd9 100644
--- a/accel/mshv/mshv-all.c
+++ b/accel/mshv/mshv-all.c
@@ -275,7 +275,12 @@ static int ioeventfd(int vm_fd, int event_fd, uint64_t addr, Datamatch dm,
         }
     }

-    return ioctl(vm_fd, MSHV_IOEVENTFD, &args);
+    int ret = ioctl(vm_fd, MSHV_IOEVENTFD, &args);
+    if (ret < 0) {
+        return -errno;
+    }
+
+    return ret;
 }

 static int unregister_ioevent(int vm_fd, int event_fd, uint64_t mmio_addr,