Hi
----- Original Message -----
> On Thu, Sep 24, 2015 at 06:22:11PM +0200, marcandre.lur...@redhat.com wrote:
> > From: Marc-André Lureau <marcandre.lur...@redhat.com>
> >
> > Do not allocate a shared log if the backend doesn't support it.
> >
> > Signed-off-by: Marc-André Lureau <marcandre.lur...@redhat.com>
>
> So squash this in the previous patch introducing the shared log?
> This split makes review harder, not easier.
Ok, I'll try to reorder things
>
> > ---
> > hw/virtio/vhost-user.c | 9 +++++++++
> > hw/virtio/vhost.c | 15 ++++++++++-----
> > include/hw/virtio/vhost-backend.h | 4 ++++
> > 3 files changed, 23 insertions(+), 5 deletions(-)
> >
> > diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
> > index 41e0364..455caba 100644
> > --- a/hw/virtio/vhost-user.c
> > +++ b/hw/virtio/vhost-user.c
> > @@ -553,6 +553,14 @@ static int vhost_user_get_vq_index(struct vhost_dev
> > *dev, int idx)
> > return idx;
> > }
> >
> > +static bool vhost_user_requires_shm_log(struct vhost_dev *dev)
> > +{
> > + assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
> > +
> > + return virtio_has_feature(dev->protocol_features,
> > + VHOST_USER_PROTOCOL_F_LOG_SHMFD);
> > +}
> > +
> > const VhostOps user_ops = {
> > .backend_type = VHOST_BACKEND_TYPE_USER,
> > .vhost_backend_init = vhost_user_init,
> > @@ -573,4 +581,5 @@ const VhostOps user_ops = {
> > .vhost_reset_device = vhost_user_reset_device,
> > .vhost_get_vq_index = vhost_user_get_vq_index,
> > .vhost_set_vring_enable = vhost_user_set_vring_enable,
> > + .vhost_requires_shm_log = vhost_user_requires_shm_log,
> > };
> > diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
> > index d9f2131..ec27c7b 100644
> > --- a/hw/virtio/vhost.c
> > +++ b/hw/virtio/vhost.c
> > @@ -357,10 +357,15 @@ static void vhost_log_put(struct vhost_dev *dev, bool
> > sync)
> > }
> > }
> >
> > -static inline void vhost_dev_log_resize(struct vhost_dev* dev, uint64_t
> > size)
> > +static bool vhost_dev_log_is_shared(struct vhost_dev *dev)
> > {
> > - bool share = dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER;
> > - struct vhost_log *log = vhost_log_get(size, share);
> > + return dev->vhost_ops->vhost_requires_shm_log &&
> > + dev->vhost_ops->vhost_requires_shm_log(dev);
> > +}
> > +
> > +static inline void vhost_dev_log_resize(struct vhost_dev *dev, uint64_t
> > size)
> > +{
> > + struct vhost_log *log = vhost_log_get(size,
> > vhost_dev_log_is_shared(dev));
> > uint64_t log_base = (uintptr_t)log->log;
> > int r;
> >
> > @@ -1166,10 +1171,10 @@ int vhost_dev_start(struct vhost_dev *hdev,
> > VirtIODevice *vdev)
> >
> > if (hdev->log_enabled) {
> > uint64_t log_base;
> > - bool share = hdev->vhost_ops->backend_type ==
> > VHOST_BACKEND_TYPE_USER;
> >
> > hdev->log_size = vhost_get_log_size(hdev);
> > - hdev->log = vhost_log_get(hdev->log_size, share);
> > + hdev->log = vhost_log_get(hdev->log_size,
> > + vhost_dev_log_is_shared(hdev));
> > log_base = (uintptr_t)hdev->log->log;
> > r = hdev->vhost_ops->vhost_set_log_base(hdev,
> > hdev->log_size ? log_base
> > : 0,
> > diff --git a/include/hw/virtio/vhost-backend.h
> > b/include/hw/virtio/vhost-backend.h
> > index 868a78a..e07118c 100644
> > --- a/include/hw/virtio/vhost-backend.h
> > +++ b/include/hw/virtio/vhost-backend.h
> > @@ -11,6 +11,8 @@
> > #ifndef VHOST_BACKEND_H_
> > #define VHOST_BACKEND_H_
> >
> > +#include <stdbool.h>
> > +
> > typedef enum VhostBackendType {
> > VHOST_BACKEND_TYPE_NONE = 0,
> > VHOST_BACKEND_TYPE_KERNEL = 1,
> > @@ -64,6 +66,7 @@ typedef int (*vhost_reset_device_op)(struct vhost_dev
> > *dev);
> > typedef int (*vhost_get_vq_index_op)(struct vhost_dev *dev, int idx);
> > typedef int (*vhost_set_vring_enable_op)(struct vhost_dev *dev,
> > int enable);
> > +typedef bool (*vhost_requires_shm_log_op)(struct vhost_dev *dev);
> >
> > typedef struct VhostOps {
> > VhostBackendType backend_type;
> > @@ -90,6 +93,7 @@ typedef struct VhostOps {
> > vhost_reset_device_op vhost_reset_device;
> > vhost_get_vq_index_op vhost_get_vq_index;
> > vhost_set_vring_enable_op vhost_set_vring_enable;
> > + vhost_requires_shm_log_op vhost_requires_shm_log;
> > } VhostOps;
> >
> > extern const VhostOps user_ops;
> > --
> > 2.4.3
>
