[PATCH 6/9] vhost-user: enable frontends on any POSIX system

[Stefano Garzarella]

The vhost-user protocol is not really Linux-specific so let's enable
vhost-user frontends for any POSIX system.

In vhost_net.c we use VHOST_FILE_UNBIND which is defined in a Linux
specific header, let's define it for other systems as well.

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
---
If we want to be more conservative, maybe we can leave `have_vhost_user`
auto only on linux. I removed it more to test with CI if we have any
problems in the other POSIX systems.

In hw/net/vhost_net.c maybe we can just do:
 #ifndef VHOST_FILE_UNBIND
 #define VHOST_FILE_UNBIND -1
 #endif

Any suggestion?

Thanks,
Stefano
---
 meson.build        | 1 -
 hw/net/vhost_net.c | 8 +++++++-
 hw/block/Kconfig   | 2 +-
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/meson.build b/meson.build
index 0ef1654e86..462f2d7593 100644
--- a/meson.build
+++ b/meson.build
@@ -151,7 +151,6 @@ have_tpm = get_option('tpm') \
 
 # vhost
 have_vhost_user = get_option('vhost_user') \
-  .disable_auto_if(host_os != 'linux') \
   .require(host_os != 'windows',
            error_message: 'vhost-user is not available on Windows').allowed()
 have_vhost_vdpa = get_option('vhost_vdpa') \
diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index e8e1661646..346ef74eb1 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -34,8 +34,14 @@
 #include "standard-headers/linux/virtio_ring.h"
 #include "hw/virtio/vhost.h"
 #include "hw/virtio/virtio-bus.h"
-#include "linux-headers/linux/vhost.h"
 
+#if defined(__linux__)
+#include "linux-headers/linux/vhost.h"
+#else
+#ifndef VHOST_FILE_UNBIND
+#define VHOST_FILE_UNBIND -1
+#endif
+#endif
 
 /* Features supported by host kernel. */
 static const int kernel_feature_bits[] = {
diff --git a/hw/block/Kconfig b/hw/block/Kconfig
index 9e8f28f982..29ee09e434 100644
--- a/hw/block/Kconfig
+++ b/hw/block/Kconfig
@@ -40,7 +40,7 @@ config VHOST_USER_BLK
     bool
     # Only PCI devices are provided for now
     default y if VIRTIO_PCI
-    depends on VIRTIO && VHOST_USER && LINUX
+    depends on VIRTIO && VHOST_USER
 
 config SWIM
     bool
-- 
2.43.2