Re: [Qemu-devel] [PATCH 3/5] vhost: restrict Linux dependency to kernel vhost

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 26/11/18 14:20, Paolo Bonzini wrote:
> vhost-user does not depend on Linux; it can run on any POSIX system.  Restrict
> vhost-kernel to Linux in hw/virtio/vhost-backend.c, everything else can be
> compiled on all POSIX systems.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  backends/Makefile.objs     |  5 ++---
>  default-configs/virtio.mak |  4 ++--
>  hw/net/vhost_net.c         |  2 +-
>  hw/virtio/Makefile.objs    |  5 +++--
>  hw/virtio/vhost-backend.c  | 11 +++++++++--
>  5 files changed, 17 insertions(+), 10 deletions(-)
> 
> diff --git a/backends/Makefile.objs b/backends/Makefile.objs
> index 717fcbd..ff619d3 100644
> --- a/backends/Makefile.objs
> +++ b/backends/Makefile.objs
> @@ -9,10 +9,9 @@ common-obj-$(CONFIG_POSIX) += hostmem-file.o
>  common-obj-y += cryptodev.o
>  common-obj-y += cryptodev-builtin.o
>  
> -ifeq ($(CONFIG_VIRTIO),y)
> +ifeq ($(CONFIG_VIRTIO_CRYPTO),y)
>  common-obj-y += cryptodev-vhost.o
> -common-obj-$(call land,$(CONFIG_VHOST_USER),$(CONFIG_LINUX)) += \
> -    cryptodev-vhost-user.o
> +common-obj-$(CONFIG_VHOST_CRYPTO) += cryptodev-vhost-user.o
>  endif

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>

>  
>  common-obj-$(CONFIG_LINUX) += hostmem-memfd.o
> diff --git a/default-configs/virtio.mak b/default-configs/virtio.mak
> index 1304849..340050a 100644
> --- a/default-configs/virtio.mak
> +++ b/default-configs/virtio.mak
> @@ -1,5 +1,5 @@
> -CONFIG_VHOST_USER_SCSI=$(call land,$(CONFIG_VHOST_USER),$(CONFIG_LINUX))
> -CONFIG_VHOST_USER_BLK=$(call land,$(CONFIG_VHOST_USER),$(CONFIG_LINUX))
> +CONFIG_VHOST_USER_SCSI=$(CONFIG_VHOST_USER)
> +CONFIG_VHOST_USER_BLK=$(CONFIG_VHOST_USER)
>  CONFIG_VIRTIO=y
>  CONFIG_VIRTIO_9P=y
>  CONFIG_VIRTIO_BALLOON=y
> diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
> index fe6202a..2a300ee 100644
> --- a/hw/net/vhost_net.c
> +++ b/hw/net/vhost_net.c
> @@ -193,7 +193,7 @@ struct vhost_net *vhost_net_init(VhostNetOptions *options)
>      }
>  
>      /* Set sane init value. Override when guest acks. */
> -#ifdef CONFIG_VHOST_USER
> +#ifdef CONFIG_VHOST_NET_USER
>      if (net->nc->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
>          features = vhost_user_get_acked_features(net->nc);
>          if (~net->dev.features & features) {
> diff --git a/hw/virtio/Makefile.objs b/hw/virtio/Makefile.objs
> index 1b2799c..e8eff80 100644
> --- a/hw/virtio/Makefile.objs
> +++ b/hw/virtio/Makefile.objs
> @@ -9,9 +9,10 @@ obj-$(CONFIG_VIRTIO_BALLOON) += virtio-balloon.o
>  obj-$(CONFIG_VIRTIO_CRYPTO) += virtio-crypto.o
>  obj-$(call land,$(CONFIG_VIRTIO_CRYPTO),$(CONFIG_VIRTIO_PCI)) += virtio-crypto-pci.o
>  
> -obj-$(CONFIG_LINUX) += vhost.o vhost-backend.o vhost-user.o
> +obj-$(CONFIG_VHOST_USER) += vhost-user.o
>  obj-$(CONFIG_VHOST_VSOCK) += vhost-vsock.o
> +obj-$(call lor,$(CONFIG_VHOST_USER),$(CONFIG_LINUX)) += vhost.o vhost-backend.o
> +common-obj-$(call lnot,$(call lor,$(CONFIG_VHOST_USER),$(CONFIG_LINUX))) += vhost-stub.o
>  endif
>  
> -common-obj-$(call lnot,$(call land,$(CONFIG_VIRTIO),$(CONFIG_LINUX))) += vhost-stub.o
>  common-obj-$(CONFIG_ALL) += vhost-stub.o
> diff --git a/hw/virtio/vhost-backend.c b/hw/virtio/vhost-backend.c
> index 7f09efa..b5d2e30 100644
> --- a/hw/virtio/vhost-backend.c
> +++ b/hw/virtio/vhost-backend.c
> @@ -9,12 +9,14 @@
>   */
>  
>  #include "qemu/osdep.h"
> -#include <linux/vhost.h>
> -#include <sys/ioctl.h>
>  #include "hw/virtio/vhost.h"
>  #include "hw/virtio/vhost-backend.h"
>  #include "qemu/error-report.h"
>  
> +#ifdef CONFIG_LINUX
> +#include <linux/vhost.h>
> +#include <sys/ioctl.h>
> +
>  static int vhost_kernel_call(struct vhost_dev *dev, unsigned long int request,
>                               void *arg)
>  {
> @@ -265,18 +267,23 @@ static const VhostOps kernel_ops = {
>          .vhost_set_iotlb_callback = vhost_kernel_set_iotlb_callback,
>          .vhost_send_device_iotlb_msg = vhost_kernel_send_device_iotlb_msg,
>  };
> +#endif
>  
>  int vhost_set_backend_type(struct vhost_dev *dev, VhostBackendType backend_type)
>  {
>      int r = 0;
>  
>      switch (backend_type) {
> +#ifdef CONFIG_LINUX
>      case VHOST_BACKEND_TYPE_KERNEL:
>          dev->vhost_ops = &kernel_ops;
>          break;
> +#endif
> +#ifdef CONFIG_VHOST_USER
>      case VHOST_BACKEND_TYPE_USER:
>          dev->vhost_ops = &user_ops;
>          break;
> +#endif
>      default:
>          error_report("Unknown vhost backend type");
>          r = -1;
>