From 86f394851b9bd4e0b0b3188b4792d8780b7c52e0 Mon Sep 17 00:00:00 2001
From: Jian Jun Chen <jian.jun.chen@intel.com>
Date: Thu, 29 Mar 2018 12:44:52 +0800
Subject: [PATCH] dm/VBS-U: increase generation when configuration changed

Virtio 1.0 introdues a generation number for the device-specific
configuration. It should be increased every time the configuration
noticeably changes.

Signed-off-by: Jian Jun Chen <jian.jun.chen@intel.com>
Reviewed-by: Hao Li <hao.l.li@intel.com>
Reviewed-by: Zhao Yakui <yakui.zhao@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
---
 devicemodel/include/virtio.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/devicemodel/include/virtio.h b/devicemodel/include/virtio.h
index d35fc69d5..ef7379bce 100644
--- a/devicemodel/include/virtio.h
+++ b/devicemodel/include/virtio.h
@@ -674,6 +674,10 @@ vq_interrupt(struct virtio_base *vb, struct virtio_vq_info *vq)
 static inline void
 virtio_config_changed(struct virtio_base *vb)
 {
+	if (!(vb->status & VIRTIO_CR_STATUS_DRIVER_OK))
+		return;
+
+	vb->config_generation++;
 
 	if (pci_msix_enabled(vb->dev))
 		pci_generate_msix(vb->dev, vb->msix_cfg_idx);