A new functional test is added that exercises the code changes related to closing of the old KVM VM file descriptor and opening a new one upon VM reset. This normally happens when confidential guests are resetted but for non-confidential guests, we use a special machine specific debug/test parameter 'x-change-vmfd-on-reset' to enable this behavior. Only specific code changes related to re-initialization of SEV-ES, SEV-SNP and TDX platforms are not exercized in this test as they require hardware that supports running confidential guests.
Signed-off-by: Ani Sinha <[email protected]> --- MAINTAINERS | 6 ++ tests/functional/x86_64/meson.build | 1 + .../x86_64/test_vmfd_change_reboot.py | 75 +++++++++++++++++++ 3 files changed, 82 insertions(+) create mode 100755 tests/functional/x86_64/test_vmfd_change_reboot.py diff --git a/MAINTAINERS b/MAINTAINERS index 9a55b649e8..11871fdd35 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -150,6 +150,12 @@ F: tools/i386/ F: tests/functional/i386/ F: tests/functional/x86_64/ +X86 VM file descriptor change on reset test +M: Ani Sinha <[email protected]> +M: Paolo Bonzini <[email protected]> +S: Maintained +F: tests/functional/x86_64/test_vmfd_change_reboot.py + Guest CPU cores (TCG) --------------------- Overall TCG CPUs diff --git a/tests/functional/x86_64/meson.build b/tests/functional/x86_64/meson.build index f78eec5e6c..784d9791cb 100644 --- a/tests/functional/x86_64/meson.build +++ b/tests/functional/x86_64/meson.build @@ -36,4 +36,5 @@ tests_x86_64_system_thorough = [ 'vfio_user_client', 'virtio_balloon', 'virtio_gpu', + 'vmfd_change_reboot', ] diff --git a/tests/functional/x86_64/test_vmfd_change_reboot.py b/tests/functional/x86_64/test_vmfd_change_reboot.py new file mode 100755 index 0000000000..3b33322880 --- /dev/null +++ b/tests/functional/x86_64/test_vmfd_change_reboot.py @@ -0,0 +1,75 @@ +#!/usr/bin/env python3 +# +# KVM VM file descriptor change on reset test +# +# Copyright © 2026 Red Hat, Inc. +# +# Author: +# Ani Sinha <[email protected]> +# +# SPDX-License-Identifier: GPL-2.0-or-later + +import os +from qemu.machine import machine + +from qemu_test import QemuSystemTest, Asset, exec_command_and_wait_for_pattern +from qemu_test import wait_for_console_pattern + +class KVMGuest(QemuSystemTest): + + ASSET_UKI = Asset('https://gitlab.com/anisinha/misc-artifacts/' + '-/raw/main/uki.x86-64.efi?ref_type=heads', + 'e0f806bd1fa24111312e1fe849d2ee69808d4343930a5' + 'dc8c1688da17c65f576') + ASSET_OVMF = Asset('https://gitlab.com/anisinha/misc-artifacts/' + '-/raw/main/OVMF.stateless.fd?ref_type=heads', + '58a4275aafa8774bd6b1540adceae4ea434b8db75b476' + '11839ff47be88cfcf22') + + def common_vm_setup(self): + self.require_accelerator("kvm") + + self.vm.set_console() + + self.vm.add_args("-accel", "kvm") + self.vm.add_args("-smp", "2") + self.vm.add_args("-cpu", "host") + self.vm.add_args("-m", "2G") + self.vm.add_args("-nographic", "-nodefaults") + + self.uki_path = self.ASSET_UKI.fetch() + self.ovmf_path = self.ASSET_OVMF.fetch() + + def run_and_check(self): + self.vm.add_args('-kernel', self.uki_path) + self.vm.add_args("-bios", self.ovmf_path) + # enable KVM VMFD change on reset for a non-coco VM + self.vm.add_args("-machine", "q35,x-change-vmfd-on-reset=on") + # enable tracing + self.vm.add_args("-d", "trace:kvm_reset_vmfd") + + try: + self.vm.launch() + except machine.VMLaunchFailure as e: + raise e + + self.log.info('VM launched') + console_pattern = 'bash-5.1#' + wait_for_console_pattern(self, console_pattern) + self.log.info('VM ready with a bash prompt') + + exec_command_and_wait_for_pattern(self, '/usr/sbin/reboot -f', + 'reboot: machine restart') + console_pattern = '# --- Hello world ---' + wait_for_console_pattern(self, console_pattern) + self.vm.shutdown() + self.assertRegex(self.vm.get_log(), + r'kvm_reset_vmfd \nINFO: virtual machine accel file ' + 'descriptor has changed') + + def test_vmfd_change_on_reset(self): + self.common_vm_setup() + self.run_and_check() + +if __name__ == '__main__': + QemuSystemTest.main() -- 2.42.0
