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Fix adding pci_bridges to qemu vms

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* Offset pci_device_id for network devices by 32 (formerly 4)
  to reserve first 32 IDs for non-netdev devices
  * This implies a new pci_bridge for the netdevs and
    the pci_device_ids starting at 0 (using modulo)
  * Fixes a bug in the creation of the qemu command
    when the number of qemu pcie devices (storage_controller, disks, …)
    was greater than 4 and the number of network devices
    saturated the 32 pcie ids of the root bridge
    causing qemu not to start.
This commit is contained in:
Tobias Stein 2025-04-28 21:07:52 +02:00
parent d9dcc2738d
commit cdf819f820
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1 changed files with 7 additions and 2 deletions
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9
gns3server/compute/qemu/qemu_vm.py
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@ -2445,7 +2445,12 @@ class QemuVM(BaseNode):
) # we do not want any user networking back-end if no adapter is connected.
# Each 32 PCI device we need to add a PCI bridge with max 9 bridges
pci_devices = 4 + len(self._ethernet_adapters) # 4 PCI devices are use by default by qemu
# Reserve 32 devices on root pci_bridge,
# since the number of devices used by templates may differ significantly
# and pci_bridges also consume IDs.
# Move network devices to their own bridge
pci_devices_reserved = 32
pci_devices = pci_devices_reserved + len(self._ethernet_adapters)
pci_bridges = math.floor(pci_devices / 32)
pci_bridges_created = 0
if pci_bridges >= 1:
@ -2454,7 +2459,7 @@ class QemuVM(BaseNode):
"Qemu version 2.4 or later is required to run this VM with a large number of network adapters"
)
pci_device_id = 4 + pci_bridges # Bridge consume PCI ports
pci_device_id = pci_devices_reserved
for adapter_number, adapter in enumerate(self._ethernet_adapters):
mac = int_to_macaddress(macaddress_to_int(self._mac_address) + adapter_number)