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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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37
virtio-devices/src/rng.rs
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@@ -10,7 +10,6 @@ use super::{
};
use crate::seccomp_filters::{get_seccomp_filter, Thread};
use crate::{VirtioInterrupt, VirtioInterruptType};
use anyhow::anyhow;
use seccomp::{SeccompAction, SeccompFilter};
use std::fs::File;
use std::io;
@@ -20,10 +19,7 @@ use std::sync::atomic::AtomicBool;
use std::sync::{Arc, Barrier};
use std::thread;
use vm_memory::{Bytes, GuestAddressSpace, GuestMemoryAtomic, GuestMemoryMmap};
use vm_migration::{
Migratable, MigratableError, Pausable, Snapshot, SnapshotDataSection, Snapshottable,
Transportable,
};
use vm_migration::{Migratable, MigratableError, Pausable, Snapshot, Snapshottable, Transportable};
use vmm_sys_util::eventfd::EventFd;
const QUEUE_SIZE: u16 = 256;
@@ -303,37 +299,12 @@ impl Snapshottable for Rng {
}
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 rng_snapshot = Snapshot::new(self.id.as_str());
rng_snapshot.add_data_section(SnapshotDataSection {
id: format!("{}-section", self.id),
snapshot,
});
Ok(rng_snapshot)
Snapshot::new_from_state(&self.id, &self.state())
}
fn restore(&mut self, snapshot: Snapshot) -> std::result::Result<(), MigratableError> {
if let Some(rng_section) = snapshot.snapshot_data.get(&format!("{}-section", self.id)) {
let rng_state = match serde_json::from_slice(&rng_section.snapshot) {
Ok(state) => state,
Err(error) => {
return Err(MigratableError::Restore(anyhow!(
"Could not deserialize RNG {}",
error
)))
}
};
self.set_state(&rng_state);
return Ok(());
}
Err(MigratableError::Restore(anyhow!(
"Could not find RNG snapshot section"
)))
self.set_state(&snapshot.to_state(&self.id)?);
Ok(())
}
}