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UEFI improvements for Qemu VMs

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* Add OVMF firmware directory configuration
* Automatically add a Random Number Generator (RNG) device when using uefi option is enabled
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grossmj committed 2026-07-13 11:08:17 +02:00
1 parent a58fa8602b
commit 896b4fc56a
2 files changed
+16 -7
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gns3server/compute/qemu/qemu_vm.py
+14 -7
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@@ -35,6 +35,7 @@ import time
import json
import psutil
from pathlib import Path
from gns3server.utils import parse_version, shlex_quote
from gns3server.utils.asyncio import subprocess_check_output, cancellable_wait_run_in_executor
from .qemu_error import QemuError
@@ -2057,15 +2058,17 @@ class QemuVM(BaseNode):
options.extend(["-bios", self._bios_image.replace(",", ",,")])
elif self._uefi:
ovmf_firmware_dir = self._manager.config.get_section_config("Qemu").get("ovmf_firmware_dir", "/usr/share/OVMF")
system_ovmf_firmware_dir = Path(ovmf_firmware_dir)
log.info("Using OVMF firmware directory: {}".format(system_ovmf_firmware_dir))
old_ovmf_vars_path = os.path.join(self.working_dir, "OVMF_VARS.fd")
if os.path.exists(old_ovmf_vars_path):
# the node has its own UEFI variables store already, we must also use the old UEFI firmware
ovmf_firmware_path = self.manager.get_abs_image_path("OVMF_CODE.fd")
else:
system_ovmf_firmware_path = "/usr/share/OVMF/OVMF_CODE_4M.fd"
if os.path.exists(system_ovmf_firmware_path):
ovmf_firmware_path = system_ovmf_firmware_path
system_ovmf_firmware_path = next(system_ovmf_firmware_dir.glob("OVMF_CODE_4M.fd", case_sensitive=False), None)
if system_ovmf_firmware_path:
ovmf_firmware_path = str(system_ovmf_firmware_path)
else:
# otherwise, get the UEFI firmware from the images directory
ovmf_firmware_path = self.manager.get_abs_image_path("OVMF_CODE_4M.fd")
@@ -2074,9 +2077,9 @@ class QemuVM(BaseNode):
options.extend(["-drive", "if=pflash,format=raw,readonly,file={}".format(ovmf_firmware_path)])
# try to use the UEFI variables store from the system first
system_ovmf_vars_path = "/usr/share/OVMF/OVMF_VARS_4M.fd"
if os.path.exists(system_ovmf_vars_path):
ovmf_vars_path = system_ovmf_vars_path
system_ovmf_vars_path = next(system_ovmf_firmware_dir.glob("OVMF_VARS_4M.fd", case_sensitive=False), None)
if system_ovmf_vars_path:
ovmf_vars_path = str(system_ovmf_vars_path)
else:
# otherwise, get the UEFI variables store from the images directory
ovmf_vars_path = self.manager.get_abs_image_path("OVMF_VARS_4M.fd")
@@ -2092,6 +2095,10 @@ class QemuVM(BaseNode):
except OSError as e:
raise QemuError("Cannot copy OVMF_VARS_4M.fd file to the node working directory: {}".format(e))
options.extend(["-drive", "if=pflash,format=raw,file={}".format(ovmf_vars_node_path)])
# edk2 firmware requires a Random Number Generator (RNG) device in order to turn network adapters on
options.extend(["-object", "rng-random,filename=/dev/urandom,id=rng0 "])
options.extend(["-device", "virtio-rng-pci,rng=rng0"])
return options
def _linux_boot_options(self):