diff options
Diffstat (limited to 'kernel/virtio_disk.c')
| -rw-r--r-- | kernel/virtio_disk.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/virtio_disk.c b/kernel/virtio_disk.c index 6620037..3406478 100644 --- a/kernel/virtio_disk.c +++ b/kernel/virtio_disk.c @@ -199,6 +199,8 @@ virtio_disk_rw(struct buf *b) buf0.reserved = 0; buf0.sector = sector; + // buf0 is on a kernel stack, which is not direct mapped, + // thus the call to kernelpa(). desc[idx[0]].addr = (uint64) kernelpa((uint64) &buf0); desc[idx[0]].len = sizeof(buf0); desc[idx[0]].flags = VRING_DESC_F_NEXT; |