This patch is about the bug that VMs can't idle.
ACRN enables VM's C-state by extracting host's C-state table.
The C-state table has two types of interfaces: system-IO and mwait. VMs
just need one of them. ACRN can support both.
Currently we are telling users to use the system-IO type. That is, by
adding 'nomwait intel_idle.max_cstate=0' to host Linux's CMD line when
using board_inspector. (The reaseon we were using system-IO is that
mwait was buggy on Apollo Lake.)
But recent tests show that system-IO is somehow buggy. Linux c-state
driver(no matter intel_cstate or acpi_cstate) fails to enter idle state
with system-IO. This can always be reproduced on native environments.
MPERF counters show CPU cores are not in real idle state as expected.
To enable C-state in VMs, we have to switch to mwait.
As ACRN has already supported both system-IO and mwait, we don't have
to modify any code. We just need to tell user to use mwait instead of
system-IO.
That is, don't add 'nomwait intel_idle.max_cstate=0' to host Linux's
CMD line when using board_inspector. Just add 'intel_idle.max_cstate=0'
Due to the Apollo Lake's mwait bug, 'nomwait' is still needed for
Apollo Lake as an exception.
Tracked-On: #7371
Reviewed-by: Junjie Mao <junjie.mao@intel.com>
Signed-off-by: Zhou, Wu <wu.zhou@intel.com>
Without this ``iomem=relaxed`` kernel parameter, the generated board XML
is essentially the same as having ``--basic`` when executing the board
inspector, i.e. the ACPI namespace will not be parsed. The generated
board XML may still work, but some functionality (e.g. passthru of TPM
and other PCI devices that need INTx) will no longer work due to lack of
hardware information.
Replacing PR #6618
Tracked-On: #5692
Signed-off-by: zhongzhenx.liu <zhongzhenx.liu@intel.com>
Signed-off-by: David B. Kinder <david.b.kinder@intel.com>
1. rename “cli.py” to “board_inspector.py”,
and update the script name in README file.
2. rename “app.py” to “acrn_configurator.py”.
Tracked-On: #6417
Signed-off-by: Kunhui-Li <kunhuix.li@intel.com>
Update the content about getting board xml from native
enviroment in acrn_configuration_tool.rst and README.
Tracked-On: #6134
Signed-off-by: Kunhui Li <kunhuix.li@intel.com>
This patch reorganize the files of the board inspector as follows.
1. Rename the directory name from `target` to `board_inspector`, in order to
align with the name used in ACRN documentation.
2. Move the scripts that generate the current board XML into the `legacy`
sub-directory. The legacy nodes will be removed after transitioning to the
new board XML schema completely,
3. Add the main script `cli.py` which is the command line interface of the board
inspector.
v1 -> v2:
- Rename `run.py` to `cli.py`.
Tracked-On: #5922
Signed-off-by: Junjie Mao <junjie.mao@intel.com>
