kvm-unit-tests is designed to be run with QEMU as the virtual machine
monitor. It relies on devices emulated by QEMU (like isa-debug-exit or
testdev) and it makes certain assumptions based on the implicit QEMU
virtual environment configuration (like the serial base address).
kvmtool [1] is a lightweight virtual machine monitor for running KVM
guests. kvmtool has reduced complexity compared to QEMU and is easily
hackable.
This patch series aims to make it possible to run kvm-unit-tests using
kvmtool on the arm and arm64 architectures, with two caveats:
(1) When terminating a test, the userspace process won't exit with an exit
code that signals the success or failure of the test. Output from the test
can still be parsed to determine the outcome of the test.
(2) kvmtool has been designed to work with a linux guest and it
automatically generates the command line arguments for a Linux kernel. The
arm/arm64 selftest and gic tests will fail if unexpected command line
arguments are found. To get around this limitation, the test binary needs
to be loaded using the --firmware option introduced by kvmtool in commit
5e4b563d75b9 ("arm: Allow command line for firmware"). This option
suppresses the automatic kernel command line and can be used to run all
tests, not just the tests that require specific arguments.
The run scripts haven't been modified. To run a test under kvmtool, one
needs to launch kvmtool manually. For example, to run the timer test the
following command can be used:
lkvm run --cpus 1 --console serial --firmware timer.flat.
To run the gicv3-ipi test:
lkvm run --cpus 8 --console serial --params "ipi" --irqchip gicv3 \
--firmware gic.flat
Changes in v3:
* Updated cover letter with information about the kvmtool --firmware
option.
* Gathered Reviewed-by tags.
* Renamed the config.h define UART_EARLY_BASE to CONFIG_UART_EARLY_BASE and
made the necessary casts in lib/arm/io.c
Changes in v2:
* Generate lib/config.h when configuring kvm-unit-tests; arm/arm64 uses it
to get the UART address.
* Added --vmm configure option for arm/arm64 which will set the UART
address in lib/config.h when the tests are run under QEMU or kvmtool.
* Renamed psci_sys_reset() to psci_system_reset().
* Dropped patches that allowed a test to ignore unexpected command line
arguments.
Summary:
* Patches 1, 2 and 3 add support for configuring kvm-unit-tests on arm and
arm64 to use the ns16550a UART emulated by kvmtool.
* Patches 4 and 5 provide an alternative mechanism for terminating the
virtual machine by using PSCI.
[1] https://git.kernel.org/pub/scm/linux/kernel/git/will/kvmtool.git/
[2] https://www.spinics.net/lists/kvm-arm/msg34352.html
Alexandru Elisei (5):
lib: arm: Use UART address from generated config.h
configure: arm/arm64: Add --vmm option with no effect
lib: arm: Use ns16550a UART when --vmm=kvmtool
lib: arm: Implement PSCI SYSTEM_OFF in psci_system_off()
lib: arm: Fallback to psci_system_off() in exit()
configure | 32 ++++++++++++++++++++++++++++++++
Makefile | 2 +-
lib/arm/asm/psci.h | 3 ++-
lib/arm/io.c | 41 ++++++++++++++++++++++++++---------------
lib/arm/psci.c | 8 +++++++-
.gitignore | 1 +
6 files changed, 69 insertions(+), 18 deletions(-)
--
2.17.0
