diff options
| -rw-r--r-- | hw/virtio/virtio.c | 45 |
1 files changed, 30 insertions, 15 deletions
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 9164579..a00380f 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -185,10 +185,16 @@ static void vring_desc_read(VirtIODevice *vdev, VRingDesc *desc, virtio_tswap16s(vdev, &desc->next); } +static VRingMemoryRegionCaches *vring_get_region_caches(struct VirtQueue *vq) +{ + VRingMemoryRegionCaches *caches = atomic_rcu_read(&vq->vring.caches); + assert(caches != NULL); + return caches; +} /* Called within rcu_read_lock(). */ static inline uint16_t vring_avail_flags(VirtQueue *vq) { - VRingMemoryRegionCaches *caches = atomic_rcu_read(&vq->vring.caches); + VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); hwaddr pa = offsetof(VRingAvail, flags); return virtio_lduw_phys_cached(vq->vdev, &caches->avail, pa); } @@ -196,7 +202,7 @@ static inline uint16_t vring_avail_flags(VirtQueue *vq) /* Called within rcu_read_lock(). */ static inline uint16_t vring_avail_idx(VirtQueue *vq) { - VRingMemoryRegionCaches *caches = atomic_rcu_read(&vq->vring.caches); + VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); hwaddr pa = offsetof(VRingAvail, idx); vq->shadow_avail_idx = virtio_lduw_phys_cached(vq->vdev, &caches->avail, pa); return vq->shadow_avail_idx; @@ -205,7 +211,7 @@ static inline uint16_t vring_avail_idx(VirtQueue *vq) /* Called within rcu_read_lock(). */ static inline uint16_t vring_avail_ring(VirtQueue *vq, int i) { - VRingMemoryRegionCaches *caches = atomic_rcu_read(&vq->vring.caches); + VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); hwaddr pa = offsetof(VRingAvail, ring[i]); return virtio_lduw_phys_cached(vq->vdev, &caches->avail, pa); } @@ -220,7 +226,7 @@ static inline uint16_t vring_get_used_event(VirtQueue *vq) static inline void vring_used_write(VirtQueue *vq, VRingUsedElem *uelem, int i) { - VRingMemoryRegionCaches *caches = atomic_rcu_read(&vq->vring.caches); + VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); hwaddr pa = offsetof(VRingUsed, ring[i]); virtio_tswap32s(vq->vdev, &uelem->id); virtio_tswap32s(vq->vdev, &uelem->len); @@ -231,7 +237,7 @@ static inline void vring_used_write(VirtQueue *vq, VRingUsedElem *uelem, /* Called within rcu_read_lock(). */ static uint16_t vring_used_idx(VirtQueue *vq) { - VRingMemoryRegionCaches *caches = atomic_rcu_read(&vq->vring.caches); + VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); hwaddr pa = offsetof(VRingUsed, idx); return virtio_lduw_phys_cached(vq->vdev, &caches->used, pa); } @@ -239,7 +245,7 @@ static uint16_t vring_used_idx(VirtQueue *vq) /* Called within rcu_read_lock(). */ static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val) { - VRingMemoryRegionCaches *caches = atomic_rcu_read(&vq->vring.caches); + VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); hwaddr pa = offsetof(VRingUsed, idx); virtio_stw_phys_cached(vq->vdev, &caches->used, pa, val); address_space_cache_invalidate(&caches->used, pa, sizeof(val)); @@ -249,7 +255,7 @@ static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val) /* Called within rcu_read_lock(). */ static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) { - VRingMemoryRegionCaches *caches = atomic_rcu_read(&vq->vring.caches); + VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); VirtIODevice *vdev = vq->vdev; hwaddr pa = offsetof(VRingUsed, flags); uint16_t flags = virtio_lduw_phys_cached(vq->vdev, &caches->used, pa); @@ -261,7 +267,7 @@ static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) /* Called within rcu_read_lock(). */ static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask) { - VRingMemoryRegionCaches *caches = atomic_rcu_read(&vq->vring.caches); + VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); VirtIODevice *vdev = vq->vdev; hwaddr pa = offsetof(VRingUsed, flags); uint16_t flags = virtio_lduw_phys_cached(vq->vdev, &caches->used, pa); @@ -279,7 +285,7 @@ static inline void vring_set_avail_event(VirtQueue *vq, uint16_t val) return; } - caches = atomic_rcu_read(&vq->vring.caches); + caches = vring_get_region_caches(vq); pa = offsetof(VRingUsed, ring[vq->vring.num]); virtio_stw_phys_cached(vq->vdev, &caches->used, pa, val); address_space_cache_invalidate(&caches->used, pa, sizeof(val)); @@ -577,7 +583,7 @@ void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes, total_bufs = in_total = out_total = 0; max = vq->vring.num; - caches = atomic_rcu_read(&vq->vring.caches); + caches = vring_get_region_caches(vq); if (caches->desc.len < max * sizeof(VRingDesc)) { virtio_error(vdev, "Cannot map descriptor ring"); goto err; @@ -844,7 +850,7 @@ void *virtqueue_pop(VirtQueue *vq, size_t sz) i = head; - caches = atomic_rcu_read(&vq->vring.caches); + caches = vring_get_region_caches(vq); if (caches->desc.len < max * sizeof(VRingDesc)) { virtio_error(vdev, "Cannot map descriptor ring"); goto done; @@ -1143,6 +1149,17 @@ static enum virtio_device_endian virtio_current_cpu_endian(void) } } +static void virtio_virtqueue_reset_region_cache(struct VirtQueue *vq) +{ + VRingMemoryRegionCaches *caches; + + caches = atomic_read(&vq->vring.caches); + atomic_rcu_set(&vq->vring.caches, NULL); + if (caches) { + call_rcu(caches, virtio_free_region_cache, rcu); + } +} + void virtio_reset(void *opaque) { VirtIODevice *vdev = opaque; @@ -1183,6 +1200,7 @@ void virtio_reset(void *opaque) vdev->vq[i].notification = true; vdev->vq[i].vring.num = vdev->vq[i].vring.num_default; vdev->vq[i].inuse = 0; + virtio_virtqueue_reset_region_cache(&vdev->vq[i]); } } @@ -2477,13 +2495,10 @@ static void virtio_device_free_virtqueues(VirtIODevice *vdev) } for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { - VRingMemoryRegionCaches *caches; if (vdev->vq[i].vring.num == 0) { break; } - caches = atomic_read(&vdev->vq[i].vring.caches); - atomic_set(&vdev->vq[i].vring.caches, NULL); - virtio_free_region_cache(caches); + virtio_virtqueue_reset_region_cache(&vdev->vq[i]); } g_free(vdev->vq); } |