diff options
Diffstat (limited to 'hw/virtio/dataplane/vring.c')
| -rw-r--r-- | hw/virtio/dataplane/vring.c | 53 |
1 files changed, 34 insertions, 19 deletions
diff --git a/hw/virtio/dataplane/vring.c b/hw/virtio/dataplane/vring.c index 78c6f45a07..0936f659e5 100644 --- a/hw/virtio/dataplane/vring.c +++ b/hw/virtio/dataplane/vring.c @@ -18,7 +18,9 @@ #include "hw/hw.h" #include "exec/memory.h" #include "exec/address-spaces.h" +#include "hw/virtio/virtio-access.h" #include "hw/virtio/dataplane/vring.h" +#include "hw/virtio/dataplane/vring-accessors.h" #include "qemu/error-report.h" /* vring_map can be coupled with vring_unmap or (if you still have the @@ -83,7 +85,7 @@ bool vring_setup(Vring *vring, VirtIODevice *vdev, int n) vring_init(&vring->vr, virtio_queue_get_num(vdev, n), vring_ptr, 4096); vring->last_avail_idx = virtio_queue_get_last_avail_idx(vdev, n); - vring->last_used_idx = vring->vr.used->idx; + vring->last_used_idx = vring_get_used_idx(vdev, vring); vring->signalled_used = 0; vring->signalled_used_valid = false; @@ -104,7 +106,7 @@ void vring_teardown(Vring *vring, VirtIODevice *vdev, int n) void vring_disable_notification(VirtIODevice *vdev, Vring *vring) { if (!(vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX))) { - vring->vr.used->flags |= VRING_USED_F_NO_NOTIFY; + vring_set_used_flags(vdev, vring, VRING_USED_F_NO_NOTIFY); } } @@ -117,10 +119,10 @@ bool vring_enable_notification(VirtIODevice *vdev, Vring *vring) if (vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX)) { vring_avail_event(&vring->vr) = vring->vr.avail->idx; } else { - vring->vr.used->flags &= ~VRING_USED_F_NO_NOTIFY; + vring_clear_used_flags(vdev, vring, VRING_USED_F_NO_NOTIFY); } smp_mb(); /* ensure update is seen before reading avail_idx */ - return !vring_more_avail(vring); + return !vring_more_avail(vdev, vring); } /* This is stolen from linux/drivers/vhost/vhost.c:vhost_notify() */ @@ -134,12 +136,13 @@ bool vring_should_notify(VirtIODevice *vdev, Vring *vring) smp_mb(); if ((vdev->guest_features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) && - unlikely(vring->vr.avail->idx == vring->last_avail_idx)) { + unlikely(!vring_more_avail(vdev, vring))) { return true; } if (!(vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX))) { - return !(vring->vr.avail->flags & VRING_AVAIL_F_NO_INTERRUPT); + return !(vring_get_avail_flags(vdev, vring) & + VRING_AVAIL_F_NO_INTERRUPT); } old = vring->signalled_used; v = vring->signalled_used_valid; @@ -202,9 +205,19 @@ static int get_desc(Vring *vring, VirtQueueElement *elem, return 0; } +static void copy_in_vring_desc(VirtIODevice *vdev, + const struct vring_desc *guest, + struct vring_desc *host) +{ + host->addr = virtio_ldq_p(vdev, &guest->addr); + host->len = virtio_ldl_p(vdev, &guest->len); + host->flags = virtio_lduw_p(vdev, &guest->flags); + host->next = virtio_lduw_p(vdev, &guest->next); +} + /* This is stolen from linux/drivers/vhost/vhost.c. */ -static int get_indirect(Vring *vring, VirtQueueElement *elem, - struct vring_desc *indirect) +static int get_indirect(VirtIODevice *vdev, Vring *vring, + VirtQueueElement *elem, struct vring_desc *indirect) { struct vring_desc desc; unsigned int i = 0, count, found = 0; @@ -244,7 +257,7 @@ static int get_indirect(Vring *vring, VirtQueueElement *elem, vring->broken = true; return -EFAULT; } - desc = *desc_ptr; + copy_in_vring_desc(vdev, desc_ptr, &desc); memory_region_unref(mr); /* Ensure descriptor has been loaded before accessing fields */ @@ -320,7 +333,7 @@ int vring_pop(VirtIODevice *vdev, Vring *vring, /* Check it isn't doing very strange things with descriptor numbers. */ last_avail_idx = vring->last_avail_idx; - avail_idx = vring->vr.avail->idx; + avail_idx = vring_get_avail_idx(vdev, vring); barrier(); /* load indices now and not again later */ if (unlikely((uint16_t)(avail_idx - last_avail_idx) > num)) { @@ -341,7 +354,7 @@ int vring_pop(VirtIODevice *vdev, Vring *vring, /* Grab the next descriptor number they're advertising, and increment * the index we've seen. */ - head = vring->vr.avail->ring[last_avail_idx % num]; + head = vring_get_avail_ring(vdev, vring, last_avail_idx % num); elem->index = head; @@ -365,13 +378,13 @@ int vring_pop(VirtIODevice *vdev, Vring *vring, ret = -EFAULT; goto out; } - desc = vring->vr.desc[i]; + copy_in_vring_desc(vdev, &vring->vr.desc[i], &desc); /* Ensure descriptor is loaded before accessing fields */ barrier(); if (desc.flags & VRING_DESC_F_INDIRECT) { - ret = get_indirect(vring, elem, &desc); + ret = get_indirect(vdev, vring, elem, &desc); if (ret < 0) { goto out; } @@ -407,9 +420,9 @@ out: * * Stolen from linux/drivers/vhost/vhost.c. */ -void vring_push(Vring *vring, VirtQueueElement *elem, int len) +void vring_push(VirtIODevice *vdev, Vring *vring, VirtQueueElement *elem, + int len) { - struct vring_used_elem *used; unsigned int head = elem->index; uint16_t new; @@ -422,14 +435,16 @@ void vring_push(Vring *vring, VirtQueueElement *elem, int len) /* The virtqueue contains a ring of used buffers. Get a pointer to the * next entry in that used ring. */ - used = &vring->vr.used->ring[vring->last_used_idx % vring->vr.num]; - used->id = head; - used->len = len; + vring_set_used_ring_id(vdev, vring, vring->last_used_idx % vring->vr.num, + head); + vring_set_used_ring_len(vdev, vring, vring->last_used_idx % vring->vr.num, + len); /* Make sure buffer is written before we update index. */ smp_wmb(); - new = vring->vr.used->idx = ++vring->last_used_idx; + new = ++vring->last_used_idx; + vring_set_used_idx(vdev, vring, new); if (unlikely((int16_t)(new - vring->signalled_used) < (uint16_t)1)) { vring->signalled_used_valid = false; } |