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virtio-devices: block_io_uring: Port to VirtioCommon for feature handling

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Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2020-09-03 10:37:36 +01:00 committed by Sebastien Boeuf
parent e3abcdbff8
commit dc9f1e4cdf
1 changed files with 18 additions and 27 deletions
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45
virtio-devices/src/block_io_uring.rs
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@ -11,7 +11,7 @@
use super::Error as DeviceError;
use super::{
ActivateError, ActivateResult, EpollHelper, EpollHelperError, EpollHelperHandler, Queue,
VirtioDevice, VirtioDeviceType, VirtioInterruptType, EPOLL_HELPER_EVENT_LAST,
VirtioCommon, VirtioDevice, VirtioDeviceType, VirtioInterruptType, EPOLL_HELPER_EVENT_LAST,
};
use crate::VirtioInterrupt;
use anyhow::anyhow;
@ -300,13 +300,12 @@ impl EpollHelperHandler for BlockIoUringEpollHandler {
/// Virtio device for exposing block level read/write operations on a host file.
pub struct BlockIoUring {
common: VirtioCommon,
id: String,
kill_evt: Option<EventFd>,
disk_image: File,
disk_path: PathBuf,
disk_nsectors: u64,
avail_features: u64,
acked_features: u64,
config: VirtioBlockConfig,
queue_evts: Option<Vec<EventFd>>,
interrupt_cb: Option<Arc<dyn VirtioInterrupt>>,
@ -373,13 +372,15 @@ impl BlockIoUring {
}
Ok(BlockIoUring {
common: VirtioCommon {
avail_features,
acked_features: 0u64,
},
id,
kill_evt: None,
disk_image,
disk_path,
disk_nsectors,
avail_features,
acked_features: 0u64,
config,
queue_evts: None,
interrupt_cb: None,
@ -397,8 +398,8 @@ impl BlockIoUring {
BlockState {
disk_path: self.disk_path.clone(),
disk_nsectors: self.disk_nsectors,
avail_features: self.avail_features,
acked_features: self.acked_features,
avail_features: self.common.avail_features,
acked_features: self.common.acked_features,
config: self.config,
}
}
@ -406,8 +407,8 @@ impl BlockIoUring {
fn set_state(&mut self, state: &BlockState) -> io::Result<()> {
self.disk_path = state.disk_path.clone();
self.disk_nsectors = state.disk_nsectors;
self.avail_features = state.avail_features;
self.acked_features = state.acked_features;
self.common.avail_features = state.avail_features;
self.common.acked_features = state.acked_features;
self.config = state.config;
Ok(())
@ -415,13 +416,12 @@ impl BlockIoUring {
fn update_writeback(&mut self) {
// Use writeback from config if VIRTIO_BLK_F_CONFIG_WCE
let writeback =
if self.acked_features & 1 << VIRTIO_BLK_F_CONFIG_WCE == 1 << VIRTIO_BLK_F_CONFIG_WCE {
self.config.writeback == 1
} else {
// Else check if VIRTIO_BLK_F_FLUSH negotiated
self.acked_features & 1 << VIRTIO_BLK_F_FLUSH == 1 << VIRTIO_BLK_F_FLUSH
};
let writeback = if self.common.feature_acked(VIRTIO_BLK_F_CONFIG_WCE.into()) {
self.config.writeback == 1
} else {
// Else check if VIRTIO_BLK_F_FLUSH negotiated
self.common.feature_acked(VIRTIO_BLK_F_FLUSH.into())
};
info!(
"Changing cache mode to {}",
@ -454,20 +454,11 @@ impl VirtioDevice for BlockIoUring {
}
fn features(&self) -> u64 {
self.avail_features
self.common.avail_features
}
fn ack_features(&mut self, value: u64) {
let mut v = value;
// Check if the guest is ACK'ing a feature that we didn't claim to have.
let unrequested_features = v & !self.avail_features;
if unrequested_features != 0 {
warn!("Received acknowledge request for unknown feature.");
// Don't count these features as acked.
v &= !unrequested_features;
}
self.acked_features |= v;
self.common.ack_features(value)
}
fn read_config(&self, offset: u64, data: &mut [u8]) {