hw/virtio: Add support for VDPA network simulation devices

This patch adds support for VDPA network simulation devices.
The device is developed based on virtio-net and tap backend,
and supports hardware live migration function.

For more details, please refer to "docs/system/devices/vdpa-net.rst"

Signed-off-by: Hao Chen <chenh@yusur.tech>
Message-Id: <20240221073802.2888022-1-chenh@yusur.tech>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index a3c711b56d..27055a4b8e 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -1999,6 +1999,22 @@ static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf,
             goto err;
         }
 
+        /* Mark dirty page's bitmap of guest memory */
+        if (vdev->lm_logging_ctrl == LM_ENABLE) {
+            uint64_t chunk = elem->in_addr[i] / VHOST_LOG_CHUNK;
+            /* Get chunk index */
+            BitmapMemoryRegionCaches *caches = qatomic_rcu_read(&vdev->caches);
+            uint64_t index = chunk / 8;
+            uint64_t shift = chunk % 8;
+            uint8_t val = 0;
+            address_space_read_cached(&caches->bitmap, index, &val,
+                                      sizeof(val));
+            val |= 1 << shift;
+            address_space_write_cached(&caches->bitmap, index, &val,
+                                       sizeof(val));
+            address_space_cache_invalidate(&caches->bitmap, index, sizeof(val));
+        }
+
         elems[i] = elem;
         lens[i] = total;
         i++;