From 6cb9e17dcc07d6fc1467a585fb015991191a92da Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
Date: Thu, 20 Oct 2022 10:02:30 +0200
Subject: [PATCH] vdpa: Remove shadow CVQ command check
MIME-Version: 1.0
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The guest will see undefined behavior if it issue not negotiate
commands, bit it is expected somehow.

Simplify code deleting this check.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: fangyi <eric.fangyi@huawei.com>
---
 net/vhost-vdpa.c | 48 ------------------------------------------------
 1 file changed, 48 deletions(-)

diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index f4f6b8587f..c8c433002d 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -469,48 +469,6 @@ static NetClientInfo net_vhost_vdpa_cvq_info = {
     .check_peer_type = vhost_vdpa_check_peer_type,
 };
 
-/**
- * Do not forward commands not supported by SVQ. Otherwise, the device could
- * accept it and qemu would not know how to update the device model.
- */
-static bool vhost_vdpa_net_cvq_validate_cmd(const void *out_buf, size_t len)
-{
-    struct virtio_net_ctrl_hdr ctrl;
-
-    if (unlikely(len < sizeof(ctrl))) {
-        qemu_log_mask(LOG_GUEST_ERROR,
-                      "%s: invalid legnth of out buffer %zu\n", __func__, len);
-        return false;
-    }
-
-    memcpy(&ctrl, out_buf, sizeof(ctrl));
-    switch (ctrl.class) {
-    case VIRTIO_NET_CTRL_MAC:
-        switch (ctrl.cmd) {
-        case VIRTIO_NET_CTRL_MAC_ADDR_SET:
-            return true;
-        default:
-            qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid mac cmd %u\n",
-                          __func__, ctrl.cmd);
-        };
-        break;
-    case VIRTIO_NET_CTRL_MQ:
-        switch (ctrl.cmd) {
-        case VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET:
-            return true;
-        default:
-            qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid mq cmd %u\n",
-                          __func__, ctrl.cmd);
-        };
-        break;
-    default:
-        qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid control class %u\n",
-                      __func__, ctrl.class);
-    };
-
-    return false;
-}
-
 /**
  * Validate and copy control virtqueue commands.
  *
@@ -534,16 +492,10 @@ static int vhost_vdpa_net_handle_ctrl_avail(VhostShadowVirtqueue *svq,
         .iov_len = sizeof(status),
     };
     ssize_t dev_written = -EINVAL;
-    bool ok;
 
     out.iov_len = iov_to_buf(elem->out_sg, elem->out_num, 0,
                              s->cvq_cmd_out_buffer,
                              vhost_vdpa_net_cvq_cmd_len());
-    ok = vhost_vdpa_net_cvq_validate_cmd(s->cvq_cmd_out_buffer, out.iov_len);
-    if (unlikely(!ok)) {
-        goto out;
-    }
-
     dev_written = vhost_vdpa_net_cvq_add(s, out.iov_len, sizeof(status));
     if (unlikely(dev_written < 0)) {
         goto out;
-- 
2.27.0