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vmm: device_manager: Fix PCI device unplug issues

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Because of the PCI refactoring that happened in the previous commit
d793cc4da3, the ability to fully remove a
PCI device was altered.

The refactoring was correct, but the usage of a generic function to pass
the same reference for both BusDevice, PciDevice and Any + Send + Sync
causes the Arc::ptr_eq() function to behave differently than expected,
as it does not match the references later in the code. That means we
were not able to remove the device reference from the MMIO and/or PIO
buses, which was leading to some bus range overlapping error once we
were trying to add a device again to the previous range that should have
been removed.

Fixes #1802

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2020-10-05 19:13:28 +02:00
parent a32bd2fae1
commit 6aa5e21212
1 changed files with 17 additions and 14 deletions
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31
vmm/src/device_manager.rs
View File

@ -2703,9 +2703,13 @@ impl DeviceManager {
})
.map_err(DeviceManagerError::VfioMapRegion)?;
let vfio_pci_device = Arc::new(Mutex::new(vfio_pci_device));
self.add_pci_device(
pci,
Arc::new(Mutex::new(vfio_pci_device)),
vfio_pci_device.clone(),
vfio_pci_device.clone(),
vfio_pci_device,
pci_device_bdf,
vfio_name.clone(),
)?;
@ -2714,34 +2718,31 @@ impl DeviceManager {
}
#[cfg(feature = "pci_support")]
fn add_pci_device<T>(
fn add_pci_device(
&mut self,
pci_bus: &mut PciBus,
device: Arc<Mutex<T>>,
bus_device: Arc<Mutex<dyn BusDevice>>,
pci_device: Arc<Mutex<dyn PciDevice>>,
any_device: Arc<dyn Any + Send + Sync>,
bdf: u32,
device_id: String,
) -> DeviceManagerResult<Vec<(GuestAddress, GuestUsize, PciBarRegionType)>>
where
T: BusDevice + PciDevice + Any + Send + Sync,
{
let bars = device
) -> DeviceManagerResult<Vec<(GuestAddress, GuestUsize, PciBarRegionType)>> {
let bars = pci_device
.lock()
.unwrap()
.allocate_bars(&mut self.address_manager.allocator.lock().unwrap())
.map_err(DeviceManagerError::AllocateBars)?;
pci_bus
.add_device(bdf, device.clone())
.add_device(bdf, pci_device)
.map_err(DeviceManagerError::AddPciDevice)?;
self.pci_devices
.insert(bdf, Arc::clone(&device) as Arc<dyn Any + Send + Sync>);
self.bus_devices
.push(Arc::clone(&device) as Arc<Mutex<dyn BusDevice>>);
self.pci_devices.insert(bdf, any_device);
self.bus_devices.push(Arc::clone(&bus_device));
pci_bus
.register_mapping(
device,
bus_device,
#[cfg(target_arch = "x86_64")]
self.address_manager.io_bus.as_ref(),
self.address_manager.mmio_bus.as_ref(),
@ -2901,6 +2902,8 @@ impl DeviceManager {
let bars = self.add_pci_device(
pci,
virtio_pci_device.clone(),
virtio_pci_device.clone(),
virtio_pci_device.clone(),
pci_device_bdf,
virtio_device_id,
)?;