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vhost-user-blk: make read_config work

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Since config space in vhost-user-blk are mostly from backend
device, this change will get config space info from backend
by vhost-user protocol.

Signed-off-by: Yang Zhong <yang.zhong@intel.com>
This commit is contained in:
Yang Zhong 2019-09-11 11:22:48 +08:00 committed by Samuel Ortiz
parent a949ab21f7
commit 39083d705b
1 changed files with 14 additions and 3 deletions
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17
vm-virtio/src/vhost_user/blk.rs
View File

@ -94,11 +94,22 @@ impl<'a> Blk {
}
let config_len = mem::size_of::<virtio_blk_config>();
let mut config_space: Vec<u8> = vec![0u8; config_len as usize];
let config_space: Vec<u8> = vec![0u8; config_len as usize];
let (_, mut config_space) = vhost_user_blk
.get_config(
0,
config_len as u32,
VhostUserConfigFlags::WRITABLE,
config_space.as_slice(),
)
.unwrap();
let queue_num_offset = offset_of!(virtio_blk_config, num_queues);
// only setnum_queues value.
config_space[queue_num_offset] = vu_cfg.num_queues as u8;
// Only set num_queues value(u16).
let num_queues_slice = (vu_cfg.num_queues as u16).to_le_bytes();
config_space[queue_num_offset..queue_num_offset + mem::size_of::<u16>()]
.copy_from_slice(&num_queues_slice);
Ok(Blk {
vhost_user_blk,