diff options
| -rw-r--r-- | hw/virtio/dataplane/vring.c | 69 | ||||
| -rw-r--r-- | include/hw/virtio/dataplane/vring.h | 4 |
2 files changed, 58 insertions, 15 deletions
diff --git a/hw/virtio/dataplane/vring.c b/hw/virtio/dataplane/vring.c index fece83a..68f1994 100644 --- a/hw/virtio/dataplane/vring.c +++ b/hw/virtio/dataplane/vring.c @@ -67,22 +67,53 @@ static void vring_unmap(void *buffer, bool is_write) /* Map the guest's vring to host memory */ bool vring_setup(Vring *vring, VirtIODevice *vdev, int n) { - hwaddr vring_addr = virtio_queue_get_ring_addr(vdev, n); - hwaddr vring_size = virtio_queue_get_ring_size(vdev, n); - void *vring_ptr; + struct vring *vr = &vring->vr; + hwaddr addr; + hwaddr size; + void *ptr; vring->broken = false; - - vring_ptr = vring_map(&vring->mr, vring_addr, vring_size, true); - if (!vring_ptr) { - error_report("Failed to map vring " - "addr %#" HWADDR_PRIx " size %" HWADDR_PRIu, - vring_addr, vring_size); - vring->broken = true; - return false; + vr->num = virtio_queue_get_num(vdev, n); + + addr = virtio_queue_get_desc_addr(vdev, n); + size = virtio_queue_get_desc_size(vdev, n); + /* Map the descriptor area as read only */ + ptr = vring_map(&vring->mr_desc, addr, size, false); + if (!ptr) { + error_report("Failed to map 0x%" HWADDR_PRIx " byte for vring desc " + "at 0x%" HWADDR_PRIx, + size, addr); + goto out_err_desc; } - - vring_init(&vring->vr, virtio_queue_get_num(vdev, n), vring_ptr, 4096); + vr->desc = ptr; + + addr = virtio_queue_get_avail_addr(vdev, n); + size = virtio_queue_get_avail_size(vdev, n); + /* Add the size of the used_event_idx */ + size += sizeof(uint16_t); + /* Map the driver area as read only */ + ptr = vring_map(&vring->mr_avail, addr, size, false); + if (!ptr) { + error_report("Failed to map 0x%" HWADDR_PRIx " byte for vring avail " + "at 0x%" HWADDR_PRIx, + size, addr); + goto out_err_avail; + } + vr->avail = ptr; + + addr = virtio_queue_get_used_addr(vdev, n); + size = virtio_queue_get_used_size(vdev, n); + /* Add the size of the avail_event_idx */ + size += sizeof(uint16_t); + /* Map the device area as read-write */ + ptr = vring_map(&vring->mr_used, addr, size, true); + if (!ptr) { + error_report("Failed to map 0x%" HWADDR_PRIx " byte for vring used " + "at 0x%" HWADDR_PRIx, + size, addr); + goto out_err_used; + } + vr->used = ptr; vring->last_avail_idx = virtio_queue_get_last_avail_idx(vdev, n); vring->last_used_idx = vring_get_used_idx(vdev, vring); @@ -92,6 +123,14 @@ bool vring_setup(Vring *vring, VirtIODevice *vdev, int n) trace_vring_setup(virtio_queue_get_ring_addr(vdev, n), vring->vr.desc, vring->vr.avail, vring->vr.used); return true; + +out_err_used: + memory_region_unref(vring->mr_avail); +out_err_avail: + memory_region_unref(vring->mr_desc); +out_err_desc: + vring->broken = true; + return false; } void vring_teardown(Vring *vring, VirtIODevice *vdev, int n) @@ -99,7 +138,9 @@ void vring_teardown(Vring *vring, VirtIODevice *vdev, int n) virtio_queue_set_last_avail_idx(vdev, n, vring->last_avail_idx); virtio_queue_invalidate_signalled_used(vdev, n); - memory_region_unref(vring->mr); + memory_region_unref(vring->mr_desc); + memory_region_unref(vring->mr_avail); + memory_region_unref(vring->mr_used); } /* Disable guest->host notifies */ diff --git a/include/hw/virtio/dataplane/vring.h b/include/hw/virtio/dataplane/vring.h index 8d97db9..a596e4c 100644 --- a/include/hw/virtio/dataplane/vring.h +++ b/include/hw/virtio/dataplane/vring.h @@ -22,7 +22,9 @@ #include "hw/virtio/virtio.h" typedef struct { - MemoryRegion *mr; /* memory region containing the vring */ + MemoryRegion *mr_desc; /* memory region for the vring desc */ + MemoryRegion *mr_avail; /* memory region for the vring avail */ + MemoryRegion *mr_used; /* memory region for the vring used */ struct vring vr; /* virtqueue vring mapped to host memory */ uint16_t last_avail_idx; /* last processed avail ring index */ uint16_t last_used_idx; /* last processed used ring index */ |
