kvm tools: Add guest compatability warning to virtio-net

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

diff --git a/tools/kvm/virtio/net.c b/tools/kvm/virtio/net.c
index cf7eff30d5918422eab21dd1f7b6dc0fb776c3ed..96858b73575cff19d06160962419dfdd7d554406 100644 (file)
--- a/tools/kvm/virtio/net.c
+++ b/tools/kvm/virtio/net.c
@@ -10,6 +10,7 @@
 #include "kvm/irq.h"
 #include "kvm/uip.h"
 #include "kvm/ioeventfd.h"
+#include "kvm/guest_compat.h"
 
 #include <linux/virtio_net.h>
 #include <linux/if_tun.h>
@@ -63,6 +64,7 @@ struct net_dev {
        u32                             vq_vector[VIRTIO_NET_NUM_QUEUES];
        u32                             gsis[VIRTIO_NET_NUM_QUEUES];
        u32                             msix_io_block;
+       int                             compat_id;
 
        pthread_t                       io_rx_thread;
        pthread_mutex_t                 io_rx_lock;
@@ -265,6 +267,8 @@ static bool virtio_net_pci_io_out(struct ioport *ioport, struct kvm *kvm, u16 po
 
                assert(ndev.queue_selector < VIRTIO_NET_NUM_QUEUES);
 
+               compat__remove_message(ndev.compat_id);
+
                queue                   = &ndev.vqs[ndev.queue_selector];
                queue->pfn              = ioport__read32(data);
                p                       = guest_pfn_to_host(kvm, queue->pfn);
@@ -520,4 +524,10 @@ void virtio_net__init(const struct virtio_net_parameters *params)
 
                ioeventfd__add_event(&ioevent);
        }
+
+       ndev.compat_id = compat__add_message("virtio-net device was not detected",
+                                               "While you have requested a virtio-net device, "
+                                               "the guest kernel didn't seem to detect it.\n"
+                                               "Please make sure that the kernel was compiled"
+                                               "with CONFIG_VIRTIO_NET.");
 }