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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>
15 lines
897 B
Plaintext
15 lines
897 B
Plaintext
board_parser.py will collect all board related info and then generate a board info file for acrn-config host tool usage.
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usage: python3 board_inspector.py <board_name> [--out board_info_file]
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board_name : the name of board that run ACRN hypervisor, like apl-up2/nuc7i7dnb. It will be used as name of the board configurations folder which created by acrn-config host tool.
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board_info_file : (optional) the name of board info file. if it is not specified, a name of <board_name>.xml will be generated under the current working directory by default.
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Please run this script under native Linux environment with root privilege.
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OS requirement:
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Release: Ubuntu 18.04+
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Tools: cpuid, rdmsr, lspci, lxml, dmidecode (optional)
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kernel cmdline: "iomem=relaxed intel_idle.max_cstate=0 intel_pstate=disable" or
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"idle=nomwait iomem=relaxed intel_idle.max_cstate=0 intel_pstate=disable" for Apollo Lake
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