External/cloud-hypervisor
1
0
Fork 0
mirror of https://github.com/cloud-hypervisor/cloud-hypervisor.git synced 2024-06-30 23:12:36 +00:00
Code Issues Packages Projects Releases Wiki Activity

Revert "virtio-devices, vmm: Optimised async virtio device activation"

Browse Source 
This reverts commit f160572f9d.

There has been increased flakiness around the live migration tests since
this was merged. Speculatively reverting to see if there is increased
stability.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2022-05-21 20:44:56 +01:00
parent 80f6dda932
commit fa07d83565
3 changed files with 46 additions and 84 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
virtio-devices/src/transport/mod.rs
View File

@ -6,7 +6,7 @@ use vmm_sys_util::eventfd::EventFd;
mod pci_common_config;
mod pci_device;
pub use pci_common_config::VirtioPciCommonConfig;
pub use pci_device::{VirtioPciDevice, VirtioPciDeviceActivator};
pub use pci_device::VirtioPciDevice;
pub trait VirtioTransport {
fn ioeventfds(&self, base_addr: u64) -> Vec<(&EventFd, u64)>;

99
virtio-devices/src/transport/pci_device.rs
View File

@ -287,37 +287,6 @@ struct VirtioPciDeviceState {
impl VersionMapped for VirtioPciDeviceState {}
pub struct VirtioPciDeviceActivator {
interrupt: Option<Arc<dyn VirtioInterrupt>>,
memory: Option<GuestMemoryAtomic<GuestMemoryMmap>>,
device: Arc<Mutex<dyn VirtioDevice>>,
device_activated: Arc<AtomicBool>,
queues: Option<Vec<Queue<GuestMemoryAtomic<GuestMemoryMmap>>>>,
queue_evts: Option<Vec<EventFd>>,
barrier: Option<Arc<Barrier>>,
id: String,
}
impl VirtioPciDeviceActivator {
pub fn activate(&mut self) -> ActivateResult {
self.device.lock().unwrap().activate(
self.memory.take().unwrap(),
self.interrupt.take().unwrap(),
self.queues.take().unwrap(),
self.queue_evts.take().unwrap(),
)?;
self.device_activated.store(true, Ordering::SeqCst);
if let Some(barrier) = self.barrier.take() {
info!("{}: Waiting for barrier", self.id);
barrier.wait();
info!("{}: Barrier released", self.id);
}
Ok(())
}
}
pub struct VirtioPciDevice {
id: String,
@ -369,11 +338,11 @@ pub struct VirtioPciDevice {
// EventFd to signal on to request activation
activate_evt: EventFd,
// Barrier that is used to wait on for activation
activate_barrier: Arc<Barrier>,
// Optional DMA handler
dma_handler: Option<Arc<dyn ExternalDmaMapping>>,
// Pending activations
pending_activations: Arc<Mutex<Vec<VirtioPciDeviceActivator>>>,
}
impl VirtioPciDevice {
@ -390,7 +359,6 @@ impl VirtioPciDevice {
activate_evt: EventFd,
use_64bit_bar: bool,
dma_handler: Option<Arc<dyn ExternalDmaMapping>>,
pending_activations: Arc<Mutex<Vec<VirtioPciDeviceActivator>>>,
) -> Result<Self> {
let device_clone = device.clone();
let mut locked_device = device_clone.lock().unwrap();
@ -490,8 +458,8 @@ impl VirtioPciDevice {
cap_pci_cfg_info: VirtioPciCfgCapInfo::default(),
bar_regions: vec![],
activate_evt,
activate_barrier: Arc::new(Barrier::new(2)),
dma_handler,
pending_activations,
};
if let Some(msix_config) = &virtio_pci_device.msix_config {
@ -698,37 +666,37 @@ impl VirtioPciDevice {
self.device.clone()
}
fn prepare_activator(&mut self, barrier: Option<Arc<Barrier>>) -> VirtioPciDeviceActivator {
let mut queue_evts = Vec::new();
let mut queues: Vec<Queue<GuestMemoryAtomic<GuestMemoryMmap>>> =
self.queues.iter().map(vm_virtio::clone_queue).collect();
queues.retain(|q| q.state.ready);
for (i, queue) in queues.iter().enumerate() {
queue_evts.push(self.queue_evts[i].try_clone().unwrap());
if !queue.is_valid() {
error!("Queue {} is not valid", i);
fn activate(&mut self) -> ActivateResult {
if let Some(virtio_interrupt) = self.virtio_interrupt.take() {
if self.memory.is_some() {
let mem = self.memory.as_ref().unwrap().clone();
let mut device = self.device.lock().unwrap();
let mut queue_evts = Vec::new();
let mut queues: Vec<Queue<GuestMemoryAtomic<GuestMemoryMmap>>> =
self.queues.iter().map(vm_virtio::clone_queue).collect();
queues.retain(|q| q.state.ready);
for (i, queue) in queues.iter().enumerate() {
queue_evts.push(self.queue_evts[i].try_clone().unwrap());
if !queue.is_valid() {
error!("Queue {} is not valid", i);
}
}
return device.activate(mem, virtio_interrupt, queues, queue_evts);
}
}
VirtioPciDeviceActivator {
interrupt: self.virtio_interrupt.take(),
memory: self.memory.clone(),
device: self.device.clone(),
queues: Some(queues),
device_activated: self.device_activated.clone(),
queue_evts: Some(
queue_evts
.iter()
.map(|fd| fd.try_clone().unwrap())
.collect(),
),
barrier,
id: self.id.clone(),
}
Ok(())
}
fn activate(&mut self) -> ActivateResult {
self.prepare_activator(None).activate()
pub fn maybe_activate(&mut self) {
if self.needs_activation() {
self.activate().expect("Failed to activate device");
self.device_activated.store(true, Ordering::SeqCst);
info!("{}: Waiting for barrier", self.id);
self.activate_barrier.wait();
info!("{}: Barrier released", self.id);
} else {
info!("{}: Device does not need activation", self.id)
}
}
fn needs_activation(&self) -> bool {
@ -1090,16 +1058,13 @@ impl PciDevice for VirtioPciDevice {
// Try and activate the device if the driver status has changed
if self.needs_activation() {
let barrier = Arc::new(Barrier::new(2));
let activator = self.prepare_activator(Some(barrier.clone()));
self.pending_activations.lock().unwrap().push(activator);
info!(
"{}: Needs activation; writing to activate event fd",
self.id
);
self.activate_evt.write(1).ok();
info!("{}: Needs activation; returning barrier", self.id);
return Some(barrier);
return Some(self.activate_barrier.clone());
}
// Device has been reset by the driver

29
vmm/src/device_manager.rs
View File

@ -79,12 +79,10 @@ use std::result;
use std::sync::{Arc, Mutex};
use std::time::Instant;
use vfio_ioctls::{VfioContainer, VfioDevice};
use virtio_devices::transport::VirtioPciDevice;
use virtio_devices::transport::VirtioTransport;
use virtio_devices::transport::{VirtioPciDevice, VirtioPciDeviceActivator};
use virtio_devices::vhost_user::VhostUserConfig;
use virtio_devices::{
AccessPlatformMapping, ActivateError, VdpaDmaMapping, VirtioMemMappingSource,
};
use virtio_devices::{AccessPlatformMapping, VdpaDmaMapping, VirtioMemMappingSource};
use virtio_devices::{Endpoint, IommuMapping};
use virtio_devices::{VirtioSharedMemory, VirtioSharedMemoryList};
use vm_allocator::{AddressAllocator, SystemAllocator};
@ -478,9 +476,6 @@ pub enum DeviceManagerError {
/// Invalid identifier
InvalidIdentifier(String),
/// Error activating virtio device
VirtioActivate(ActivateError),
}
pub type DeviceManagerResult<T> = result::Result<T, DeviceManagerError>;
@ -944,9 +939,6 @@ pub struct DeviceManager {
// Start time of the VM
timestamp: Instant,
// Pending activations
pending_activations: Arc<Mutex<Vec<VirtioPciDeviceActivator>>>,
}
impl DeviceManager {
@ -1088,7 +1080,6 @@ impl DeviceManager {
io_uring_supported: None,
boot_id_list,
timestamp,
pending_activations: Arc::new(Mutex::new(Vec::default())),
};
let device_manager = Arc::new(Mutex::new(device_manager));
@ -3529,7 +3520,6 @@ impl DeviceManager {
// The exception being if not on the default PCI segment.
pci_segment_id > 0 || device_type != VirtioDeviceType::Block as u32,
dma_handler,
self.pending_activations.clone(),
)
.map_err(DeviceManagerError::VirtioDevice)?,
));
@ -3684,10 +3674,17 @@ impl DeviceManager {
}
pub fn activate_virtio_devices(&self) -> DeviceManagerResult<()> {
for mut activator in self.pending_activations.lock().unwrap().drain(..) {
activator
.activate()
.map_err(DeviceManagerError::VirtioActivate)?;
// Find virtio pci devices and activate any pending ones
let device_tree = self.device_tree.lock().unwrap();
for pci_device_node in device_tree.pci_devices() {
#[allow(irrefutable_let_patterns)]
if let PciDeviceHandle::Virtio(virtio_pci_device) = &pci_device_node
.pci_device_handle
.as_ref()
.ok_or(DeviceManagerError::MissingPciDevice)?
{
virtio_pci_device.lock().unwrap().maybe_activate();
}
}
Ok(())
}