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-rw-r--r--include/hw/i386/microvm.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/include/hw/i386/microvm.h b/include/hw/i386/microvm.h
index fad97a891d..e8af61f194 100644
--- a/include/hw/i386/microvm.h
+++ b/include/hw/i386/microvm.h
@@ -50,8 +50,9 @@
  */
 
 /* Platform virtio definitions */
-#define VIRTIO_MMIO_BASE      0xfeb00000
-#define VIRTIO_CMDLINE_MAXLEN 64
+#define VIRTIO_MMIO_BASE                0xfeb00000
+#define VIRTIO_CMDLINE_MAXLEN           64
+#define VIRTIO_CMDLINE_TOTAL_MAX_LEN    ((VIRTIO_CMDLINE_MAXLEN + 1) * 16)
 
 #define GED_MMIO_BASE         0xfea00000
 #define GED_MMIO_BASE_MEMHP   (GED_MMIO_BASE + 0x100)