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vmm: Calculate MMIO config address based on segment id

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This means that each segment can have its own PCI MMIO config device
without overlapping.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2021-10-05 11:59:18 +01:00
parent b59f1d90dd
commit b55f009b8a
1 changed files with 13 additions and 4 deletions
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17
vmm/src/pci_segment.rs
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@ -21,6 +21,9 @@ use std::sync::{Arc, Mutex};
use uuid::Uuid;
use vm_device::BusDevice;
// One bus with potentially 256 devices (32 slots x 8 functions).
const PCI_MMIO_CONFIG_SIZE: u64 = 4096 * 256;
pub(crate) struct PciSegment {
id: u16,
pub(crate) pci_bus: Arc<Mutex<PciBus>>,
@ -48,6 +51,9 @@ impl PciSegment {
start_of_device_area: u64,
end_of_device_area: u64,
) -> DeviceManagerResult<PciSegment> {
// Default segment
let id = 0u16;
let pci_root = PciRoot::new(None);
let pci_bus = Arc::new(Mutex::new(PciBus::new(
pci_root,
@ -55,12 +61,15 @@ impl PciSegment {
)));
let pci_config_mmio = Arc::new(Mutex::new(PciConfigMmio::new(Arc::clone(&pci_bus))));
let mmio_config_address = layout::PCI_MMCONFIG_START.0 + PCI_MMIO_CONFIG_SIZE * id as u64;
address_manager
.mmio_bus
.insert(
Arc::clone(&pci_config_mmio) as Arc<Mutex<dyn BusDevice>>,
arch::layout::PCI_MMCONFIG_START.0,
arch::layout::PCI_MMCONFIG_SIZE,
mmio_config_address,
PCI_MMIO_CONFIG_SIZE,
)
.map_err(DeviceManagerError::BusError)?;
@ -78,10 +87,10 @@ impl PciSegment {
.map_err(DeviceManagerError::BusError)?;
let mut segment = PciSegment {
id: 0,
id,
pci_bus,
pci_config_mmio,
mmio_config_address: arch::layout::PCI_MMCONFIG_START.0,
mmio_config_address,
pci_devices_up: 0,
pci_devices_down: 0,
pci_irq_slots: [0; 32],