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vm-virtio: mmio: Expect an identifier upon device creation

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This identifier is chosen from the DeviceManager so that it will manage
all identifiers across the VM, which will ensure uniqueness.

It is based off the name from the virtio device attached to this
transport layer.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf
2020-04-27 16:05:04 +02:00
committed by Rob Bradford
parent 9d84ef5073
commit eeb7e10d1f
2 changed files with 19 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
vm-virtio/src/transport/mmio.rs
View File

@@ -4,9 +4,9 @@
use crate::transport::{VirtioTransport, NOTIFY_REG_OFFSET};
use crate::{
Queue, VirtioDevice, VirtioDeviceType, VirtioInterrupt, VirtioInterruptType,
DEVICE_ACKNOWLEDGE, DEVICE_DRIVER, DEVICE_DRIVER_OK, DEVICE_FAILED, DEVICE_FEATURES_OK,
DEVICE_INIT, INTERRUPT_STATUS_CONFIG_CHANGED, INTERRUPT_STATUS_USED_RING,
Queue, VirtioDevice, VirtioInterrupt, VirtioInterruptType, DEVICE_ACKNOWLEDGE, DEVICE_DRIVER,
DEVICE_DRIVER_OK, DEVICE_FAILED, DEVICE_FEATURES_OK, DEVICE_INIT,
INTERRUPT_STATUS_CONFIG_CHANGED, INTERRUPT_STATUS_USED_RING,
};
use anyhow::anyhow;
use byteorder::{ByteOrder, LittleEndian};
@@ -96,6 +96,7 @@ struct VirtioMmioDeviceState {
/// Typically one page (4096 bytes) of MMIO address space is sufficient to handle this transport
/// and inner virtio device.
pub struct MmioDevice {
id: String,
device: Arc<Mutex<dyn VirtioDevice>>,
device_activated: bool,
@@ -115,6 +116,7 @@ pub struct MmioDevice {
impl MmioDevice {
/// Constructs a new MMIO transport for the given virtio device.
pub fn new(
id: String,
mem: GuestMemoryAtomic<GuestMemoryMmap>,
device: Arc<Mutex<dyn VirtioDevice>>,
) -> Result<MmioDevice> {
@@ -130,6 +132,7 @@ impl MmioDevice {
.map(|&s| Queue::new(s))
.collect();
Ok(MmioDevice {
id,
device,
device_activated: false,
features_select: 0,
@@ -422,24 +425,18 @@ impl Pausable for MmioDevice {
}
}
const VIRTIO_MMIO_DEV_SNAPSHOT_ID: &str = "virtio_mmio_device";
impl Snapshottable for MmioDevice {
fn id(&self) -> String {
format!(
"{}-{}",
VIRTIO_MMIO_DEV_SNAPSHOT_ID,
VirtioDeviceType::from(self.device.lock().unwrap().device_type())
)
self.id.clone()
}
fn snapshot(&self) -> std::result::Result<Snapshot, MigratableError> {
let snapshot =
serde_json::to_vec(&self.state()).map_err(|e| MigratableError::Snapshot(e.into()))?;
let snapshot_id = self.id();
let mut virtio_mmio_dev_snapshot = Snapshot::new(&snapshot_id);
let mut virtio_mmio_dev_snapshot = Snapshot::new(self.id.as_str());
virtio_mmio_dev_snapshot.add_data_section(SnapshotDataSection {
id: format!("{}-section", snapshot_id),
id: format!("{}-section", self.id),
snapshot,
});
@@ -447,10 +444,8 @@ impl Snapshottable for MmioDevice {
}
fn restore(&mut self, snapshot: Snapshot) -> std::result::Result<(), MigratableError> {
let snapshot_id = self.id();
if let Some(virtio_mmio_dev_section) = snapshot
.snapshot_data
.get(&format!("{}-section", snapshot_id))
if let Some(virtio_mmio_dev_section) =
snapshot.snapshot_data.get(&format!("{}-section", self.id))
{
let virtio_mmio_dev_state =
match serde_json::from_slice(&virtio_mmio_dev_section.snapshot) {