diff options
Diffstat (limited to 'drivers/vhost/vhost.h')
| -rw-r--r-- | drivers/vhost/vhost.h | 86 |
1 files changed, 73 insertions, 13 deletions
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index bb75a292d50c..4fe99765c5c7 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -14,6 +14,7 @@ #include <linux/atomic.h> #include <linux/vhost_iotlb.h> #include <linux/irqbypass.h> +#include <linux/unroll.h> struct vhost_work; struct vhost_task; @@ -26,7 +27,18 @@ struct vhost_work { unsigned long flags; }; +struct vhost_worker; +struct vhost_dev; + +struct vhost_worker_ops { + int (*create)(struct vhost_worker *worker, struct vhost_dev *dev, + const char *name); + void (*stop)(struct vhost_worker *worker); + void (*wakeup)(struct vhost_worker *worker); +}; + struct vhost_worker { + struct task_struct *kthread_task; struct vhost_task *vtsk; struct vhost_dev *dev; /* Used to serialize device wide flushing with worker swapping. */ @@ -36,6 +48,7 @@ struct vhost_worker { u32 id; int attachment_cnt; bool killed; + const struct vhost_worker_ops *ops; }; /* Poll a file (eventfd or socket) */ @@ -103,6 +116,8 @@ struct vhost_virtqueue { * Values are limited to 0x7fff, and the high bit is used as * a wrap counter when using VIRTIO_F_RING_PACKED. */ u16 last_avail_idx; + /* Next avail ring head when VIRTIO_F_IN_ORDER is negoitated */ + u16 next_avail_head; /* Caches available index value from user. */ u16 avail_idx; @@ -129,11 +144,12 @@ struct vhost_virtqueue { struct iovec iotlb_iov[64]; struct iovec *indirect; struct vring_used_elem *heads; + u16 *nheads; /* Protected by virtqueue mutex. */ struct vhost_iotlb *umem; struct vhost_iotlb *iotlb; void *private_data; - u64 acked_features; + VIRTIO_DECLARE_FEATURES(acked_features); u64 acked_backend_features; /* Log write descriptors */ void __user *log_base; @@ -176,6 +192,16 @@ struct vhost_dev { int byte_weight; struct xarray worker_xa; bool use_worker; + /* + * If fork_owner is true we use vhost_tasks to create + * the worker so all settings/limits like cgroups, NPROC, + * scheduler, etc are inherited from the owner. If false, + * we use kthreads and only attach to the same cgroups + * as the owner for compat with older kernels. + * here we use true as default value. + * The default value is set by fork_from_owner_default + */ + bool fork_owner; int (*msg_handler)(struct vhost_dev *dev, u32 asid, struct vhost_iotlb_msg *msg); }; @@ -205,7 +231,15 @@ int vhost_get_vq_desc(struct vhost_virtqueue *, struct iovec iov[], unsigned int iov_size, unsigned int *out_num, unsigned int *in_num, struct vhost_log *log, unsigned int *log_num); -void vhost_discard_vq_desc(struct vhost_virtqueue *, int n); + +int vhost_get_vq_desc_n(struct vhost_virtqueue *vq, + struct iovec iov[], unsigned int iov_size, + unsigned int *out_num, unsigned int *in_num, + struct vhost_log *log, unsigned int *log_num, + unsigned int *ndesc); + +void vhost_discard_vq_desc(struct vhost_virtqueue *, int nbuf, + unsigned int ndesc); bool vhost_vq_work_queue(struct vhost_virtqueue *vq, struct vhost_work *work); bool vhost_vq_has_work(struct vhost_virtqueue *vq); @@ -213,11 +247,12 @@ bool vhost_vq_is_setup(struct vhost_virtqueue *vq); int vhost_vq_init_access(struct vhost_virtqueue *); int vhost_add_used(struct vhost_virtqueue *, unsigned int head, int len); int vhost_add_used_n(struct vhost_virtqueue *, struct vring_used_elem *heads, - unsigned count); + u16 *nheads, unsigned count); void vhost_add_used_and_signal(struct vhost_dev *, struct vhost_virtqueue *, unsigned int id, int len); void vhost_add_used_and_signal_n(struct vhost_dev *, struct vhost_virtqueue *, - struct vring_used_elem *heads, unsigned count); + struct vring_used_elem *heads, u16 *nheads, + unsigned count); void vhost_signal(struct vhost_dev *, struct vhost_virtqueue *); void vhost_disable_notify(struct vhost_dev *, struct vhost_virtqueue *); bool vhost_vq_avail_empty(struct vhost_dev *, struct vhost_virtqueue *); @@ -253,14 +288,39 @@ void vhost_iotlb_map_free(struct vhost_iotlb *iotlb, eventfd_signal((vq)->error_ctx);\ } while (0) -enum { - VHOST_FEATURES = (1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) | - (1ULL << VIRTIO_RING_F_INDIRECT_DESC) | - (1ULL << VIRTIO_RING_F_EVENT_IDX) | - (1ULL << VHOST_F_LOG_ALL) | - (1ULL << VIRTIO_F_ANY_LAYOUT) | - (1ULL << VIRTIO_F_VERSION_1) -}; +#define VHOST_FEATURES \ + VIRTIO_F_NOTIFY_ON_EMPTY, \ + VIRTIO_RING_F_INDIRECT_DESC, \ + VIRTIO_RING_F_EVENT_IDX, \ + VHOST_F_LOG_ALL, \ + VIRTIO_F_ANY_LAYOUT, \ + VIRTIO_F_VERSION_1 + +static inline u64 vhost_features_u64(const int *features, int size, int idx) +{ + u64 res = 0; + + unrolled_count(VIRTIO_FEATURES_BITS) + for (int i = 0; i < size; ++i) { + int bit = features[i]; + + if (virtio_features_chk_bit(bit) && VIRTIO_U64(bit) == idx) + res |= VIRTIO_BIT(bit); + } + return res; +} + +#define VHOST_FEATURES_U64(features, idx) \ + vhost_features_u64(features, ARRAY_SIZE(features), idx) + +#define DEFINE_VHOST_FEATURES_ARRAY_ENTRY(idx, features) \ + [idx] = VHOST_FEATURES_U64(features, idx), + +#define DEFINE_VHOST_FEATURES_ARRAY(array, features) \ + u64 array[VIRTIO_FEATURES_U64S] = { \ + UNROLL(VIRTIO_FEATURES_U64S, \ + DEFINE_VHOST_FEATURES_ARRAY_ENTRY, features) \ + } /** * vhost_vq_set_backend - Set backend. @@ -291,7 +351,7 @@ static inline void *vhost_vq_get_backend(struct vhost_virtqueue *vq) static inline bool vhost_has_feature(struct vhost_virtqueue *vq, int bit) { - return vq->acked_features & (1ULL << bit); + return virtio_features_test_bit(vq->acked_features_array, bit); } static inline bool vhost_backend_has_feature(struct vhost_virtqueue *vq, int bit) |