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pci: Use a weak reference to the AddressManager

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Storing a strong reference to the AddressManager behind the
DeviceRelocation trait results in a cyclic reference count.
Use a weak reference to break that dependency.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2019-10-28 14:29:18 -07:00 committed by Samuel Ortiz
parent 149b61b213
commit 3e819ac797
2 changed files with 11 additions and 7 deletions
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11
pci/src/bus.rs
View File

@ -10,8 +10,7 @@ use byteorder::{ByteOrder, LittleEndian};
use devices::BusDevice;
use std;
use std::ops::DerefMut;
use std::sync::Arc;
use std::sync::Mutex;
use std::sync::{Arc, Mutex, Weak};
use vm_memory::{Address, GuestAddress, GuestUsize};
const VENDOR_ID_INTEL: u16 = 0x8086;
@ -76,11 +75,11 @@ pub struct PciBus {
/// Devices attached to this bus.
/// Device 0 is host bridge.
devices: Vec<Arc<Mutex<dyn PciDevice>>>,
device_reloc: Arc<dyn DeviceRelocation>,
device_reloc: Weak<dyn DeviceRelocation>,
}
impl PciBus {
pub fn new(pci_root: PciRoot, device_reloc: Arc<dyn DeviceRelocation>) -> Self {
pub fn new(pci_root: PciRoot, device_reloc: Weak<dyn DeviceRelocation>) -> Self {
let mut devices: Vec<Arc<Mutex<dyn PciDevice>>> = Vec::new();
devices.push(Arc::new(Mutex::new(pci_root)));
@ -198,7 +197,7 @@ impl PciConfigIo {
// Reprogram the BAR if needed
if let Some(params) = bar_reprog_params {
pci_bus.device_reloc.move_bar(
pci_bus.device_reloc.upgrade().unwrap().move_bar(
params.old_base,
params.new_base,
params.len,
@ -314,7 +313,7 @@ impl PciConfigMmio {
// Reprogram the BAR if needed
if let Some(params) = bar_reprog_params {
pci_bus.device_reloc.move_bar(
pci_bus.device_reloc.upgrade().unwrap().move_bar(
params.old_base,
params.new_base,
params.len,

7
vmm/src/device_manager.rs
View File

@ -34,6 +34,8 @@ use std::os::unix::fs::OpenOptionsExt;
use std::os::unix::io::AsRawFd;
use std::ptr::null_mut;
use std::result;
#[cfg(feature = "pci_support")]
use std::sync::Weak;
use std::sync::{Arc, Mutex, RwLock};
#[cfg(feature = "pci_support")]
use vfio::{VfioDevice, VfioDmaMapping, VfioPciDevice, VfioPciError};
@ -536,7 +538,10 @@ impl DeviceManager {
#[cfg(feature = "pci_support")]
{
let pci_root = PciRoot::new(None);
let mut pci_bus = PciBus::new(pci_root, address_manager.clone());
let mut pci_bus = PciBus::new(
pci_root,
Arc::downgrade(&address_manager) as Weak<dyn DeviceRelocation>,
);
let (mut iommu_device, iommu_mapping) = if vm_info.vm_cfg.iommu {
let (device, mapping) =