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misc: Simplify snapshot/restore by using helper functions

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Simplify snapshot & restore code by using generics to specify helper
functions that take / make a Serialize / Deserialize struct

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford
2021-04-08 10:20:10 +01:00
parent 4e4c5fb6aa
commit 6f5d4702d4
18 changed files with 108 additions and 550 deletions
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40
virtio-devices/src/transport/pci_common_config.rs
View File

@@ -8,12 +8,11 @@
extern crate byteorder;
use crate::{Queue, VirtioDevice};
use anyhow::anyhow;
use byteorder::{ByteOrder, LittleEndian};
use std::sync::atomic::{AtomicU16, Ordering};
use std::sync::{Arc, Mutex};
use vm_memory::GuestAddress;
use vm_migration::{MigratableError, Pausable, Snapshot, SnapshotDataSection, Snapshottable};
use vm_migration::{MigratableError, Pausable, Snapshot, Snapshottable};
#[derive(Clone, Serialize, Deserialize)]
pub struct VirtioPciCommonConfigState {
@@ -291,43 +290,12 @@ impl Snapshottable for VirtioPciCommonConfig {
}
fn snapshot(&mut self) -> std::result::Result<Snapshot, MigratableError> {
let snapshot =
serde_json::to_vec(&self.state()).map_err(|e| MigratableError::Snapshot(e.into()))?;
let mut config_snapshot = Snapshot::new(self.id().as_str());
config_snapshot.add_data_section(SnapshotDataSection {
id: format!("{}-section", self.id()),
snapshot,
});
Ok(config_snapshot)
Snapshot::new_from_state(&self.id(), &self.state())
}
fn restore(&mut self, snapshot: Snapshot) -> std::result::Result<(), MigratableError> {
if let Some(config_section) = snapshot
.snapshot_data
.get(&format!("{}-section", self.id()))
{
let config_state = match serde_json::from_slice(&config_section.snapshot) {
Ok(state) => state,
Err(error) => {
return Err(MigratableError::Restore(anyhow!(
"Could not deserialize {}: {}",
self.id(),
error
)))
}
};
self.set_state(&config_state);
return Ok(());
}
Err(MigratableError::Restore(anyhow!(
"Could not find {} snapshot section",
self.id()
)))
self.set_state(&snapshot.to_state(&self.id())?);
Ok(())
}
}

14
virtio-devices/src/transport/pci_device.rs
View File

@@ -41,10 +41,7 @@ use vm_memory::{
Address, ByteValued, GuestAddress, GuestAddressSpace, GuestMemoryAtomic, GuestMemoryMmap,
GuestUsize, Le32,
};
use vm_migration::{
Migratable, MigratableError, Pausable, Snapshot, SnapshotDataSection, Snapshottable,
Transportable,
};
use vm_migration::{Migratable, MigratableError, Pausable, Snapshot, Snapshottable, Transportable};
use vm_virtio::{queue, VirtioIommuRemapping, VIRTIO_MSI_NO_VECTOR};
use vmm_sys_util::{errno::Result, eventfd::EventFd};
@@ -1078,14 +1075,7 @@ impl Snapshottable for VirtioPciDevice {
}
fn snapshot(&mut self) -> std::result::Result<Snapshot, MigratableError> {
let snapshot =
serde_json::to_vec(&self.state()).map_err(|e| MigratableError::Snapshot(e.into()))?;
let mut virtio_pci_dev_snapshot = Snapshot::new(self.id.as_str());
virtio_pci_dev_snapshot.add_data_section(SnapshotDataSection {
id: format!("{}-section", self.id),
snapshot,
});
let mut virtio_pci_dev_snapshot = Snapshot::new_from_state(&self.id, &self.state())?;
// Snapshot PciConfiguration
virtio_pci_dev_snapshot.add_snapshot(self.configuration.snapshot()?);