mirror of
https://chromium.googlesource.com/crosvm/crosvm
synced 2024-11-24 12:34:31 +00:00
2b109386e7
The virtio-blk configuration space has a `seg_max` field that lets the device inform the driver of the maximum number of segments allowed within a single request. The Linux virtio block driver assumes that if the corresponding feature (VIRTIO_BLK_F_SEG_MAX) is not advertised, then only one segment can be used. Add a segment limit based on sysconf(_SC_IOV_MAX) to allow the Linux block stack to make use of multiple segments in a single request, which will get translated into a single readv/writev call in the crosvm block device. BUG=None TEST=strace crosvm virtio-blk process and note preadv with iov_cnt > 1 Change-Id: Ia14ebebb85daa21e2d43437bb74886f32e6e8187 Signed-off-by: Daniel Verkamp <dverkamp@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1876806 Reviewed-by: Stephen Barber <smbarber@chromium.org> Tested-by: kokoro <noreply+kokoro@google.com> |
||
|---|---|---|
| .. | ||
| poll_token_derive | ||
| src | ||
| Cargo.toml | ||