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vhost-user-blk: enable write_config for WCE

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In vhost-user-blk, only WCE value can be set back to device in
guest kernel like
echo "write through" > /sys/block/vda/cache_type

So write_config() will only set WCE value from guest kernel to
vhost user side.

Signed-off-by: Yang Zhong <yang.zhong@intel.com>
This commit is contained in:
Yang Zhong 2019-09-05 15:39:57 +08:00 committed by Samuel Ortiz
parent 39083d705b
commit 360980d93c
1 changed files with 13 additions and 2 deletions
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15
vm-virtio/src/vhost_user/blk.rs
View File

@ -61,6 +61,10 @@ impl<'a> Blk {
| 1 << VIRTIO_F_VERSION_1
| VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits();
if wce {
avail_features |= 1 << VIRTIO_BLK_F_CONFIG_WCE;
}
// Set vhost-user owner.
vhost_user_blk
.set_owner()
@ -190,8 +194,15 @@ impl VirtioDevice for Blk {
error!("Failed to write config space");
return;
}
let (_, right) = self.config_space.split_at_mut(offset as usize);
right.copy_from_slice(&data[..]);
// In fact, write_config() only handle wce value in vhost-user-blk.
// so, we can only set wce value here.
if self.config_space[offset as usize] == data[0] {
return;
}
self.vhost_user_blk
.set_config(offset as u32, VhostUserConfigFlags::WRITABLE, data)
.expect("Failed to set config");
self.config_space[offset as usize] = data[0];
}
fn activate(