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virtio-devices: block: 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 081c897989
commit be945b3bc8
1 changed files with 19 additions and 29 deletions
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48
virtio-devices/src/block.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::seccomp_filters::{get_seccomp_filter, Thread};
use crate::VirtioInterrupt;
@ -259,13 +259,12 @@ impl<T: DiskFile> EpollHelperHandler for BlockEpollHandler<T> {
/// Virtio device for exposing block level read/write operations on a host file.
pub struct Block<T: DiskFile> {
common: VirtioCommon,
id: String,
kill_evt: Option<EventFd>,
disk_image: Arc<Mutex<T>>,
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>>,
@ -338,13 +337,15 @@ impl<T: DiskFile> Block<T> {
}
Ok(Block {
common: VirtioCommon {
avail_features,
acked_features: 0u64,
},
id,
kill_evt: None,
disk_image: Arc::new(Mutex::new(disk_image)),
disk_path,
disk_nsectors,
avail_features,
acked_features: 0u64,
config,
queue_evts: None,
interrupt_cb: None,
@ -363,8 +364,8 @@ impl<T: DiskFile> Block<T> {
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,
}
}
@ -372,8 +373,8 @@ impl<T: DiskFile> Block<T> {
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(())
@ -381,13 +382,12 @@ impl<T: DiskFile> Block<T> {
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 {}",
@ -420,20 +420,11 @@ impl<T: 'static + DiskFile + Send> VirtioDevice for Block<T> {
}
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]) {
@ -515,8 +506,7 @@ impl<T: 'static + DiskFile + Send> VirtioDevice for Block<T> {
}
self.queue_evts = Some(tmp_queue_evts);
let event_idx = self.acked_features & 1u64 << VIRTIO_RING_F_EVENT_IDX
== 1u64 << VIRTIO_RING_F_EVENT_IDX;
let event_idx = self.common.feature_acked(VIRTIO_RING_F_EVENT_IDX.into());
self.update_writeback();
let mut epoll_threads = Vec::new();