External/cloud-hypervisor
1
0
Fork 0
mirror of https://github.com/cloud-hypervisor/cloud-hypervisor.git synced 2025-03-20 07:58:55 +00:00
Code

vmm: Break the cyclic dependency between DeviceManager and IO bus

Browse Source 
By inserting the DeviceManager on the IO bus, we introduced some cyclic
dependency:

  DeviceManager ---> AddressManager ---> Bus ---> BusDevice
        ^                                             |
        |                                             |
        +---------------------------------------------+

This cycle needs to be broken by inserting a Weak reference instead of
an Arc (considered as a strong reference).

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2020-02-28 18:11:34 +01:00 committed by Rob Bradford
parent c1af13efeb
commit d47f733e51
3 changed files with 34 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
vmm/src/cpu.rs
View File

@ -507,7 +507,7 @@ impl CpuManager {
let cpu_manager = Arc::new(Mutex::new(CpuManager {
boot_vcpus,
max_vcpus,
io_bus: Arc::downgrade(&device_manager.io_bus().clone()),
io_bus: Arc::downgrade(&device_manager.io_bus()),
mmio_bus: device_manager.mmio_bus().clone(),
ioapic: device_manager.ioapic().clone(),
vm_memory: guest_memory,

38
vmm/src/device_manager.rs
View File

@ -39,7 +39,6 @@ use std::io::{self, sink, stdout};
use std::os::unix::fs::OpenOptionsExt;
use std::path::PathBuf;
use std::result;
#[cfg(feature = "pci_support")]
use std::sync::Weak;
use std::sync::{Arc, Mutex};
use tempfile::NamedTempFile;
@ -278,7 +277,7 @@ impl Console {
struct AddressManager {
allocator: Arc<Mutex<SystemAllocator>>,
io_bus: Arc<devices::Bus>,
io_bus: Weak<devices::Bus>,
mmio_bus: Arc<devices::Bus>,
vm_fd: Arc<VmFd>,
}
@ -311,6 +310,8 @@ impl DeviceRelocation for AddressManager {
// Update PIO bus
self.io_bus
.upgrade()
.unwrap()
.update_range(old_base, len, new_base, len)
.map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
}
@ -461,6 +462,7 @@ pub struct DeviceManager {
}
impl DeviceManager {
#[allow(clippy::too_many_arguments)]
pub fn new(
vm_fd: Arc<VmFd>,
config: Arc<Mutex<VmConfig>>,
@ -469,10 +471,8 @@ impl DeviceManager {
_exit_evt: &EventFd,
reset_evt: &EventFd,
vmm_path: PathBuf,
io_bus: &Arc<devices::Bus>,
) -> DeviceManagerResult<Arc<Mutex<Self>>> {
let io_bus = devices::Bus::new();
let mmio_bus = devices::Bus::new();
let mut virtio_devices: Vec<(Arc<Mutex<dyn vm_virtio::VirtioDevice>>, bool)> = Vec::new();
let migratable_devices: Vec<Arc<Mutex<dyn Migratable>>> = Vec::new();
let mut _mmap_regions = Vec::new();
@ -482,8 +482,8 @@ impl DeviceManager {
let address_manager = Arc::new(AddressManager {
allocator,
io_bus: Arc::new(io_bus),
mmio_bus: Arc::new(mmio_bus),
io_bus: Arc::downgrade(io_bus),
mmio_bus: Arc::new(devices::Bus::new()),
vm_fd: vm_fd.clone(),
});
@ -527,6 +527,8 @@ impl DeviceManager {
#[cfg(feature = "acpi")]
address_manager
.io_bus
.upgrade()
.unwrap()
.insert(memory_manager.clone(), 0xa00, 0x18)
.map_err(DeviceManagerError::BusError)?;
@ -597,6 +599,8 @@ impl DeviceManager {
#[cfg(feature = "acpi")]
address_manager
.io_bus
.upgrade()
.unwrap()
.insert(
Arc::clone(&device_manager) as Arc<Mutex<dyn BusDevice>>,
0xae00,
@ -670,6 +674,8 @@ impl DeviceManager {
let pci_config_io = Arc::new(Mutex::new(PciConfigIo::new(Arc::clone(&pci_bus))));
self.address_manager
.io_bus
.upgrade()
.unwrap()
.insert(pci_config_io, 0xcf8, 0x8)
.map_err(DeviceManagerError::BusError)?;
let pci_config_mmio = Arc::new(Mutex::new(PciConfigMmio::new(Arc::clone(&pci_bus))));
@ -752,6 +758,8 @@ impl DeviceManager {
self.address_manager
.io_bus
.upgrade()
.unwrap()
.insert(acpi_device, 0x3c0, 0x4)
.map_err(DeviceManagerError::BusError)?;
@ -783,6 +791,8 @@ impl DeviceManager {
self.address_manager
.io_bus
.upgrade()
.unwrap()
.insert(ged_device.clone(), 0xb000, 0x1)
.map_err(DeviceManagerError::BusError)?;
Ok(Some(ged_device))
@ -794,6 +804,8 @@ impl DeviceManager {
self.address_manager
.io_bus
.upgrade()
.unwrap()
.insert(i8042, 0x61, 0x4)
.map_err(DeviceManagerError::BusError)?;
#[cfg(feature = "cmos")]
@ -819,6 +831,8 @@ impl DeviceManager {
self.address_manager
.io_bus
.upgrade()
.unwrap()
.insert(cmos, 0x70, 0x2)
.map_err(DeviceManagerError::BusError)?;
}
@ -864,6 +878,8 @@ impl DeviceManager {
self.address_manager
.io_bus
.upgrade()
.unwrap()
.insert(serial.clone(), 0x3f8, 0x8)
.map_err(DeviceManagerError::BusError)?;
@ -1429,7 +1445,7 @@ impl DeviceManager {
pci.register_mapping(
vfio_pci_device,
self.address_manager.io_bus.as_ref(),
self.address_manager.io_bus.upgrade().unwrap().as_ref(),
self.address_manager.mmio_bus.as_ref(),
bars,
)
@ -1534,7 +1550,7 @@ impl DeviceManager {
pci.register_mapping(
virtio_pci_device.clone(),
self.address_manager.io_bus.as_ref(),
self.address_manager.io_bus.upgrade().unwrap().as_ref(),
self.address_manager.mmio_bus.as_ref(),
bars,
)
@ -1606,8 +1622,8 @@ impl DeviceManager {
Ok(())
}
pub fn io_bus(&self) -> &Arc<devices::Bus> {
&self.address_manager.io_bus
pub fn io_bus(&self) -> Arc<devices::Bus> {
Arc::clone(&self.address_manager.io_bus.upgrade().unwrap())
}
pub fn mmio_bus(&self) -> &Arc<devices::Bus> {

6
vmm/src/vm.rs
View File

@ -222,6 +222,8 @@ pub struct Vm {
state: RwLock<VmState>,
cpu_manager: Arc<Mutex<cpu::CpuManager>>,
memory_manager: Arc<Mutex<MemoryManager>>,
// Hold the strong reference onto the IO bus.
_io_bus: Arc<devices::Bus>,
}
impl Vm {
@ -329,6 +331,8 @@ impl Vm {
.ok_or(Error::CreateSystemAllocator)?,
));
let io_bus = Arc::new(devices::Bus::new());
let memory_config = config.lock().unwrap().memory.clone();
let memory_manager = MemoryManager::new(
@ -351,6 +355,7 @@ impl Vm {
&exit_evt,
&reset_evt,
vmm_path,
&io_bus,
)
.map_err(Error::DeviceManager)?;
@ -379,6 +384,7 @@ impl Vm {
state: RwLock::new(VmState::Created),
cpu_manager,
memory_manager,
_io_bus: io_bus,
})
}