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dm/VBS-U: increase generation when configuration changed

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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>
This commit is contained in:
Jian Jun Chen 2018-03-29 12:44:52 +08:00 committed by Jack Ren
parent 0398498846
commit 86f394851b
1 changed files with 4 additions and 0 deletions
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4
devicemodel/include/virtio.h
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@ -674,6 +674,10 @@ vq_interrupt(struct virtio_base *vb, struct virtio_vq_info *vq)
static inline void static inline void
virtio_config_changed(struct virtio_base *vb) 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)) if (pci_msix_enabled(vb->dev))
pci_generate_msix(vb->dev, vb->msix_cfg_idx); pci_generate_msix(vb->dev, vb->msix_cfg_idx);