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config-tools: remove 'nomwait' from board_inspector's requirement

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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>
This commit is contained in:
Zhou, Wu
2022-04-27 09:41:35 +08:00
committed by acrnsi-robot
parent 819a179247
commit 4b81a2d89a
3 changed files with 7 additions and 6 deletions
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2
misc/packaging/acrn-board-inspector.postinst
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@@ -9,7 +9,7 @@ sed -i '/GRUB_DEFAULT/d' ${filename}
sed -i '/GRUB_TIMEOUT/d' ${filename}
sed -i '/GRUB_HIDDEN_TIMEOUT/d' ${filename}
sed -i '/GRUB_CMDLINE_LINUX_DEFAULT/d' ${filename}
sed -i '$a GRUB_CMDLINE_LINUX_DEFAULT="quiet splash idle=nomwait iomem=relaxed intel_idle.max_cstate=0 intel_pstate=disable"' ${filename}
sed -i '$a GRUB_CMDLINE_LINUX_DEFAULT="quiet splash iomem=relaxed intel_idle.max_cstate=0 intel_pstate=disable"' ${filename}
sed -i '$a GRUB_TIMEOUT=20' ${filename}
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