virtio: maintain 'packed_ring' field in VirtIODevice

The field is 'true' when 'packed ring' feature is negotiated. Signed-off-by: Yuri Benditovich <yuri.benditovich@daynix.com>
kostyanf14 · Dec 31, 2019 · 2b41e17 · 2b41e17
1 parent 986b0b7
commit 2b41e17
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diff --git a/VirtIO/VirtIOPCICommon.c b/VirtIO/VirtIOPCICommon.c
@@ -122,6 +122,7 @@ NTSTATUS virtio_set_features(VirtIODevice *vdev, u64 features)
     NTSTATUS status;
 
     vdev->event_suppression_enabled = virtio_is_feature_enabled(features, VIRTIO_RING_F_EVENT_IDX);
+    vdev->packed_ring = virtio_is_feature_enabled(features, VIRTIO_F_RING_PACKED);
 
     status = vdev->device->set_features(vdev, features);
     if (!NT_SUCCESS(status)) {

diff --git a/VirtIO/virtio_pci.h b/VirtIO/virtio_pci.h
@@ -244,6 +244,9 @@ struct virtio_device
     // true if the VIRTIO_RING_F_EVENT_IDX feature flag has been negotiated
     bool event_suppression_enabled;
 
+    // true if the VIRTIO_F_RING_PACKED feature flag has been negotiated
+    bool packed_ring;
+
     // internal device operations, implemented separately for legacy and modern
     const struct virtio_device_ops *device;