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vmm: Do the downcast of GicDevice in a safer way for AArch64

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Downcasting of GicDevice trait might fail. Therefore we try to
downcast the trait first and only if the downcasting succeeded we
can then use the object to call methods. Otherwise, do nothing and
log the failure.

Signed-off-by: Henry Wang <Henry.Wang@arm.com>
This commit is contained in:
Henry Wang 2021-09-02 04:29:29 -04:00 committed by Rob Bradford
parent 46c60183cd
commit 0d01eac1d4
2 changed files with 25 additions and 10 deletions
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13
vmm/src/device_manager.rs
View File

@ -4147,14 +4147,19 @@ impl Pausable for DeviceManager {
.get_gic_device()
.unwrap(),
);
gic_device
if let Some(gicv3_its) = gic_device
.lock()
.unwrap()
.as_any_concrete_mut()
.downcast_mut::<KvmGicV3Its>()
.unwrap()
.pause()?;
}
{
gicv3_its.pause()?;
} else {
return Err(MigratableError::Pause(anyhow!(
"GicDevice downcast to KvmGicV3Its failed when pausing device manager!"
)));
};
};
Ok(())
}

22
vmm/src/vm.rs
View File

@ -2027,13 +2027,18 @@ impl Vm {
.set_gicr_typers(&saved_vcpu_states);
vm_snapshot.add_snapshot(
gic_device
if let Some(gicv3_its) = gic_device
.lock()
.unwrap()
.as_any_concrete_mut()
.downcast_mut::<KvmGicV3Its>()
.unwrap()
.snapshot()?,
{
gicv3_its.snapshot()?
} else {
return Err(MigratableError::Snapshot(anyhow!(
"GicDevice downcast to KvmGicV3Its failed when snapshotting VM!"
)));
},
);
Ok(())
@ -2071,13 +2076,18 @@ impl Vm {
// Restore GIC states.
if let Some(gicv3_its_snapshot) = vm_snapshot.snapshots.get(GIC_V3_ITS_SNAPSHOT_ID) {
gic_device
if let Some(gicv3_its) = gic_device
.lock()
.unwrap()
.as_any_concrete_mut()
.downcast_mut::<KvmGicV3Its>()
.unwrap()
.restore(*gicv3_its_snapshot.clone())?;
{
gicv3_its.restore(*gicv3_its_snapshot.clone())?;
} else {
return Err(MigratableError::Restore(anyhow!(
"GicDevice downcast to KvmGicV3Its failed when restoring VM!"
)));
};
} else {
return Err(MigratableError::Restore(anyhow!(
"Missing GicV3Its snapshot"