[RFC PATCH v1 12/17] hw/net/virtio-net: do not use vhost for a CoVE guest

The in-kernel vhost datapath has no access to the memory of a TEE VM, so
it cannot be used.

Signed-off-by: Baolong Duan <[email protected]>
---
 hw/net/virtio-net.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 814b99a43d..4f8db1a1aa 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -28,6 +28,7 @@
 #include "qemu/config-file.h"
 #include "qobject/qdict.h"
 #include "hw/virtio/virtio-net.h"
+#include "hw/riscv/cove.h"
 #include "net/vhost_net.h"
 #include "net/announce.h"
 #include "hw/virtio/virtio-bus.h"
@@ -326,6 +327,14 @@ static void virtio_net_vhost_status(VirtIONet *n, uint8_t status)
             }
         }
 
+        /*
+         * vhost cannot be used with a CoVE guest: the kernel datapath has no
+         * access to the memory of the TVM.
+         */
+        if (riscv_cove_vm_active()) {
+            return;
+        }
+
         n->vhost_started = 1;
         r = vhost_net_start(vdev, n->nic->ncs, queue_pairs, cvq);
         if (r < 0) {
-- 
2.34.1