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782105f7c8
We assume that bus addresses from busdma are the same thing as "physical" addresses in the Virtio specification; this seems to be true for the platforms on which Virtio is currently supported. For block devices which are limited to a single data segment per I/O, we request PAGE_SIZE alignment from busdma; this is necessary in order to support unaligned I/Os from userland, which may cross a boundary between two non-physically-contiguous pages. On devices which support more data segments per I/O, we retain the existing behaviour of limiting I/Os to (max data segs - 1) * PAGE_SIZE. Reviewed by: bryanv Sponsored by: https://www.patreon.com/cperciva Differential Revision: https://reviews.freebsd.org/D36667 |
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| .. | ||
| balloon | ||
| block | ||
| console | ||
| mmio | ||
| network | ||
| pci | ||
| random | ||
| scsi | ||
| virtio.c | ||
| virtio.h | ||
| virtio_bus_if.m | ||
| virtio_config.h | ||
| virtio_endian.h | ||
| virtio_ids.h | ||
| virtio_if.m | ||
| virtio_ring.h | ||
| virtqueue.c | ||
| virtqueue.h | ||