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| author | Daniel Verkamp <dverkamp@chromium.org> | 2019-10-23 13:55:37 -0700 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2019-11-08 20:35:18 +0000 |
| commit | 2b109386e7676333a53b1511c12dce3a4ff329e3 (patch) | |
| tree | aeca2fb84e1c452117ea79ee03ace897ebd81592 /x86_64 | |
| parent | f68a2940f4734687fba96380d1111bfae2c43ffa (diff) | |
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devices: virtio: block: advertise seg_max
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>
Diffstat (limited to 'x86_64')
0 files changed, 0 insertions, 0 deletions