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x86_64: Add description of intel ITMT option

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ITMT option allows VM to enable ITMT scheduling, but it doesn't ensure
the success of ITMT scheduling in VM.

Whether ITMT enabling can succeed depends on HWP and ACPI CPPC support
on hardware.

This option exposes related HWP and CPPC information to VM and the
intel_pstate driver of VM will decide wheter to enable ITMT scheduling
or not.

BUG=b:225375705
TEST=Set `--itmt` and check /proc/sys/kernel/sched_itmt_enabled

Change-Id: I5d12cf3fb1a30b040945e8d1db68063e810217b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3636808
Reviewed-by: Junichi Uekawa <uekawa@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Junichi Uekawa <uekawa@chromium.org>
This commit is contained in:
Zhao Liu 2022-05-10 09:52:34 +08:00 committed by Chromeos LUCI
parent b48571dee5
commit e2f8fb4fcb
1 changed files with 1 additions and 1 deletions
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2
src/main.rs
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@ -2970,7 +2970,7 @@ iommu=on|off - indicates whether to enable virtio IOMMU for this device"),
#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
Argument::flag("host-cpu-topology", "Use mirror cpu topology of Host for Guest VM, also copy some cpu feature to Guest VM."),
#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
Argument::flag("itmt", "Enable ITMT scheduling feature."),
Argument::flag("itmt", "Allow to enable ITMT scheduling feature in VM. The success of enabling depends on HWP and ACPI CPPC support on hardware."),
Argument::flag("privileged-vm", "Grant this Guest VM certian privileges to manage Host resources, such as power management."),
Argument::value("stub-pci-device", "DOMAIN:BUS:DEVICE.FUNCTION[,vendor=NUM][,device=NUM][,class=NUM][,subsystem_vendor=NUM][,subsystem_device=NUM][,revision=NUM]", "Comma-separated key=value pairs for setting up a stub PCI device that just enumerates. The first option in the list must specify a PCI address to claim.
Optional further parameters