ACRN v1.6 (Mar 2020)

We are pleased to announce the release of ACRN version 1.6.

ACRN is a flexible, lightweight reference hypervisor that is built with real-time and safety-criticality in mind. It is optimized to streamline embedded development through an open source platform. Check out What Is ACRN for more information. All project ACRN source code is maintained in the https://github.com/projectacrn/acrn-hypervisor repository and includes folders for the ACRN hypervisor, the ACRN device model, tools, and documentation. You can either download this source code as a zip or tar.gz file (see the ACRN v1.6 GitHub release page) or use Git clone and checkout commands:

git clone https://github.com/projectacrn/acrn-hypervisor
cd acrn-hypervisor
git checkout v1.6

The project’s online technical documentation is also tagged to correspond with a specific release: generated v1.6 documents can be found at https://projectacrn.github.io/1.6/. Documentation for the latest (master) branch is found at https://projectacrn.github.io/latest/. ACRN v1.6 requires Clear Linux OS version 32680.

Version 1.6 Major Features

What’s New in v1.6

• Graphics passthrough support

  • The hypervisor and Service VMs support allowing passthrough graphics devices to target DM-launched guest VMs, based on GVT-d.

• SRIOV support

  • The ACRN hypervisor allows an SRIOV-capable PCI device’s Physical Function (PF) to be allocated to the Service VM.

  • The ACRN hypervisor allows a SRIOV-capable PCI device’s Virtual Functions (VFs) to be allocated to any VM.

  • The ACRN Service VM supports the SRIOV Ethernet device (through the PF driver), and ensures that the SRIOV VF device is able to be assigned (passthrough) to a post-launched VM (launched by ACRN-DM).

• CPU sharing enhancement - Halt/Pause emulation

  • For a vCPU that uses the fairness CPU scheduler, the hypervisor supports yielding an idle vCPU (when it’s running a ‘HLT’ or ‘PAUSE’ instruction).

• PCI Config space access emulation for passthrough devices in the hypervisor

  • The hypervisor provides the necessary emulation (such as config space) of the passthrough PCI device during runtime for a DM-launched VM. Such runtime emulation is DM-independent.

• PCI bridge emulation in hypervisor

Document Updates

Many new and updated reference documents are available, including:

• Security Advisory

• Enable SR-IOV Virtualization

• Run Xenomai as the User VM OS (Real-Time VM)

• Split Device Model

• Enable RDT Configuration

We recommend that all developers upgrade to ACRN release v1.6.

New Features Details

• 3381 - Avoid interference: PCI bridges

• 3831 - Pass-thru PCI device in DM-launched VM

• 4282 - Graphics passthrough

• 4329 - CPU Sharing: Halt/Pause Emulation

• 4360 - Graphics passthrough

• 4433 - SRIOV for ethernet device

• 4433 - SRIOV Physical Function Allocated To Service OS VM

• 4433 - SRIOV Any Virtual Function Allocated To Any One VM under sharing mode

Fixed Issues Details

• 3465 -[SIT][ISD] [AUTO]add reset in”-s 2,passthru,02/00/0 ", rtvm can not launch

• 3789 -[Security][apl_sdc_stable]DM:The return value of snprintf is improperly checked.

• 3886 -Lapic-pt vcpu notification issue

• 4032 -Modify License file.

• 4042 -[KBL][HV]RTVM UOS result is invalid when run cpu2017 with 3 and 1 core

• 4094 -Error parameter for intel_pstate in launch_hard_rt_vm.sh

• 4175 -acrntrace fixes and improvement

• 4194 -Prevent compiler from optimizing out security checks

• 4212 -[KBL][acrn-configuration-tool][WaaG+RTVM]Need support pm_channel&pm_by_vuart setting for Board:nuc7i7dnb+WaaG&RTVM

• 4229 -Add range check in Kconfig.

• 4230 -Remove MAX_VCPUS_PER_VM in Kconfig

• 4253 -[WHL][Function][WaaG]Meet error log and waag can’t boot up randomly after allocated 3 cores cpu to waag

• 4255 -[acrn-configuration-tool][nuc7i7dnb][sdc]uos has no ip address

• 4258 -[Community][External]cyclictest benchmark UOS getting high.

• 4282 -ACRN-DM Pass-thru devices bars prefetchable property isn’t consistent with physical bars

• 4286 -[acrn-configuration-tool] Remove VM1.vcpu_affinity.pcuid=3 for VM1 in sdc scenario

• 4298 -[ConfigurationTool] mac address is not added to the launch script

• 4301 -[WHL][Hybrid] WHL need support Hybrid mode

• 4310 -[ISD][Function][WaaG] WaaG reboot automatically when run 3DMark-v1.5.915.0

• 4316 -[KataContainers]LaaG miss ip address when we create kata_container first with macvtap driver.

• 4325 -Do not wait pcpus offline when lapic pt is disabled.

• 4402 -UEFI UP2 board boot APs failed with ACRN hypervisor

• 4419 -[WHL][hybrid] SOS can not poweroff & reboot in hybrid mode of WHL board (multiboot2)

• 4472 -[WHL][sdc2] HV launch fails with sdc2 scenario which support launching 3 Guest OS

• 4492 -[acrn-configuration-tool] miss include head file from logical partition

• 4495 -[acrn-configuration-tool] Missing passthru nvme parameter while using WebUI to generate RTVM launch script

Known Issues

• 4046 - [WHL][Function][WaaG] Error info pop up when run 3DMARK11 on Waag

• 4047 - [WHL][Function][WaaG] passthru usb, Windows will hang when reboot it

• 4313 - [WHL][VxWorks] Failed to ping when VxWorks passthru network

• 4520 - efi-stub could get wrong bootloader name

• 4557 - [WHL][Performance][WaaG] Failed to run 3D directX9 during Passmark9.0 performance test with 7212 gfx driver

• 4558 - [WHL][Performance][WaaG] WaaG reboot automatically during run 3D directX12 with 7212 gfx driver

• 4560 - [WHL][SIT][HV]build HV fail in docker

Change Log

These commits have been added to the acrn-hypervisor repo since the v1.5 release in Dec 2019 (click the CommitID link to see details):

• 0aa2c237 - hv: change GPU passthru translation mode to TT_PASSTHROUGH

• 64352596 - hv: unmap SR-IOV VF MMIO when the VF physical device is disabled

• 1d7158c0 - acrn-config: fix missing passthru parameter for launch config

• 0eeab73c - acrn-config: add missed include in pci_dev.c for logical partition

• 05dc6c53 - OVMF release v1.6

• fd2330c9 - Doc: Changed lines in RN 1.0 and 0.1 to correct ref issue.

• 14692ef6 - hv:Rename two VM states

• a5f9ef40 - Doc: Fix tool ref tag on develop.rst page

• 9a85e274 - Doc: Re-org documentation to improve user experience; see Nav Bar

• b62d439b - acrn-config: remove a function that generates ve820 file

• 27b6c82c - acrn-config: keep HV_RAM_START 2M memory align

• 91b06a35 - acrn-config: remap PCI vbar address to high memory

• 830df76f - acrn-config: refine VM number macro from scenario config

• a8c2ba03 - HV: add pci_devices.h for nuc6cayh and apl-up2

• a68f655a - HV: update ept address range for pre-launched VM

• e7455349 - HV: move create_sos_vm_e820 to ve820.c

• a7b61d25 - HV: remove board specific ve820

• d7eac3fe - HV: decouple prelaunch VM ve820 from board configs

• 4c0965d8 - HV: correct ept page array usage

• e9a99845 - hv: refine read/write configuration APIs for vmsi/vmsix

• 4b6dd19a - hv: pci: rename CFG read/write function for PCI-compatible Configuration Mechanism

• 7e74ed55 - misc:life_mngr: support S5 triggered by RTVM

• e641202c - Doc: Add note to index.html file Note invites users to view v1.5 branch while latest build is under construction.

• 3743edf9 - doc: add site under construction page header

• 910ac9f9 - dm:send shutdown to life_mngr on SOS

• f78558a4 - dm: add one api for sending shutdown to life_mngr on SOS

• 8733abef - dm:handle shutdown command from UOS

• 4fdc2be1 - dm:replace shutdown_uos_thread with a new one

• 7e9b7a8c - dm:set pm-vuart attributes

• 790614e9 - hv:rename several variables and api for ioapic

• fa74bf40 - hv: vpci: pass through stolen memory and opregion memory for GVT-D

• 659e5420 - hv: add static check for CONFIG_HV_RAM_START and CONFIG_HV_RAM_SIZE

• 696f6c7b - hv: the VM can only deinit its own devices

• d8a19f99 - hv: refine naming

• 08ed45f4 - hv: fix wrong VF BDF

• 7b429fe4 - hv: prohibit PF from being assigned

• 657af925 - hv: passthrough a VF device

• 640cf57c - hv: disable VF device

• 2a4235f2 - hv: refine function find_vdev

• d67d0538 - hv: initialize VF BARs

• ddd6253a - hv: wrap msix map/unmap operations

• 41350c53 - hv: vpci: add _v prefix for some function name

• 835dc22a - acrn-config: sdc2 UUID update

• f727d1e7 - HV: sdc2 UUID update

• 60a7c49b - hv: Refine code for API reduction

• b25d5fa5 - acrn-config: remove redundant sos bootargs from vm config

• e5ae37eb - hv: mmu: minor fix about add_pte

• 43676577 - hv: vpci: add a global CFG header configuration access handler

• 460e7ee5 - hv: Variable/macro renaming for intr handling of PT devices using IO-APIC/PIC

• 9a794432 - acrn-config: Generate target xml and board.c file with MBA RDT resource

• 2aaa050c - HV: move out physical cfg write from vpci-bridge

• ad4d14e3 - HV: enable ARI if PCI bridge support it

• b6684f5b - HV: sanitize config file for whl-ipc-i5

• 64bf4fb8 - dm: don’t deassign pass through PCIe device in DM

• 67cb1029 - hv: update the hypervisor 64-bit entry address for efi-stub

• 49ffe168 - hv: fixup relocation delta for symbols belong to entry section

• 2aa8c9e5 - hv: add multiboot2 tags to load relocatable raw binary

• 97fc0efe - hv: remove unused cpu_primary_save_32()

• f0e5387e - hv: remove pci_vdev_read_cfg_u8/16/32

• e1ca1ae2 - hv: refine functions name

• 7c82efb9 - hv: pci: add some pre-assumption and safety check for PCIe ECAM

• 667639b5 - doc: fix a missing argument in the function description

• 93fa2bc0 - hv: minor fixes in init_paging()

• 734ad6ce - hv: refine pci_read_cap and pci_read_ext_cap

• 76f2e28e - doc: update hv device passthrough document

• b05c1afa - doc: add doxygen style comments to ptdev

• b6c0558b - HV: Update existing board.c files for RDT MBA

• 92ee33b0 - HV: Add MBA support in ACRN

• d54d35ef - acrn-config: correct console argument for logical partition scenario

• d54deca8 - hv: initialize SRIOV VF device

• 176cb31c - hv: refine vpci_init_vdev function

• 320ed6c2 - hv: refine init_one_dev_config

• 87e7d791 - hv: refine init_pdev function

• abbdef4f - hv: implement SRIOV VF_BAR initialization

• 298ef2f5 - hv: refine init_vdev_pt function

• 58c0a474 - acrn-config: Fix vbar address generated by the offline tool

• cee8dc22 - acrn-config: Remove “GUEST_FLAG_CLOS_REQUIRED” from offline tool

• 984c0753 - xmls: Update existing <$BOARD$>.xml files for RDT support

• a81fcc23 - acrn-config: Set/Unset RDT support in the <$BOARD$>.config file

• 6cfd81cd - acrn-config: Generate board.c file with multiple RDT resources

• b9f46943 - acrn-config: Update common platform clos max on scenario and vm configuration

• cdac28e8 - acrn-config: Update platform max CLOS value to be least common value among RDT resources.

• 89a63543 - acrn-config: Extract RDT resource and CLOS from target xml file

• 4a007cc3 - acrn-config: Generate target xml file with multiple RDT resources

• a63f8109 - dm: avoid clear guest memory content if guest is RTVM

• be1e3acb - dm: remove vdev_update_bar_map callback for PCIe device

• 595cefe3 - hv: xsave: move assembler to individual function

• 2f748306 - hv: introduce SRIOV interception

• 14931d11 - hv: add SRIOV capability read/write entries

• 5e989f13 - hv: check if there is enough room for all SRIOV VFs.

• ac147795 - hv: implement SRIOV-Capable device detection.

• c751a8e8 - hv: refine confusing e820 table logging layout

• bd92304d - HV: add vpci bridge operations support

• c246d1c9 - hv: xsave: bugfix for init value

• 96f92373 - hv:refine comment about intel integrated gpu dmar

• 3098c493 - acrn-config: avoid conflict slot for launch config

• 0427de5e - acrn-config: Kata VM is not supported on dual-core systems

• cef3322d - HV: Add WhiskeyLake board configuration files

• eaad91fd - HV: Remove RDT code if CONFIG_RDT_ENABLED flag is not set

• d0665fe2 - HV: Generalize RDT infrastructure and fix RDT cache configuration.

• 887e3813 - HV: Add both HW and SW checks for RDT support

• b8a021d6 - HV: split L2 and L3 cache resource MSR

• 25974299 - HV: Rename cat.c/.h files to rdt.c/.h

• ee455574 - doc: update copyright year in doc footer

• b2c6cf77 - hv: refine retpoline speculation barriers

• da3d181f - HV: init efi info with multiboot2

• 69da0243 - HV: init module and rsdp info with multiboot2

• b669a719 - HV: init mmap info with multiboot2

• d008b72f - HV: add multiboot2 header info

• 19ffaa50 - HV: init and sanitize acrn multiboot info

• 520a0222 - HV: re-arch boot component header

• 708cae7c - HV: remove DBG_LEVEL_PARSE

• a46a7b35 - Makefile: Fix build issue if the ld is updated to 2.34

• ad606102 - hv: sched_bvt: add tick handler

• 77c64ecb - hv: sched_bvt: add pick_next function

• a38f2cc9 - hv: sched_bvt: add wakeup and sleep handler

• e05eb42c - hv: sched_bvt: add init and deinit function

• a7563cb9 - hv: sched_bvt: add BVT scheduler

• 64b874ce - hv: rename BOOT_CPU_ID to BSP_CPU_ID

• 4adad73c - hv: mmio: refine mmio access handle lock granularity

• fbe57d9f - hv: vpci: restrict SOS access assigned PCI device

• 9d3d9c3d - dm: vpci: restrict SOS access assigned PCI device

• e8479f84 - hv: vPCI: remove passthrough PCI device unused code

• 9fa6eff3 - dm: vPCI: remove passthrough PCI device unused code

• dafa3da6 - vPCI: split passthrough PCI device from DM to HV

• aa38ed5b - dm: vPCI: add assign/deassign PCI device IC APIs

• fe3182ea - hv: vPCI: add assign/deassign PCI device HC APIs

• 2ca01206 - Makefile: fix build issue on old gcc

• f3a4b232 - hv: add P2SB device to whitelist for apl-mrb

• 170aa935 - acrn-config: add P2SB device to whitelist for apl-mrb

• 0829edee - dm:add an extra lpc bridge when enabling gvt-d

• da2ed57a - dm:add igd-lpc class for Windows guest when enabling gvt-d

• 1303861d - hv:enable gpu iommu except APL platforms

• 1f1eb7fd - hv:disable iommu snoop control to enable gvt-d by an option

• 53de3a72 - hv: reset vcpu events in reset_vcpu

• cf3544b4 - Doc: VM2 vCPU affinity info update

• cc6f0949 - hv: CAT is supposed to be enabled in the system level

• 8dcede76 - Makefile: disable fcf-protection for some build env

• 8ddbfc26 - acrn: add pxelinux as known bootloader

• 50f28452 - acrn-config: a few changes on vm_config[] clos generation

• 7f57e64e - Delete pass-through audio to WaaG in default.

• 7d4b2c82 - Edits to Ubuntu SOS; changed SOS/UOS to Service VM/User VM

• f3249e77 - hv: enable early pr_xxx() logs

• db6fe1e3 - doc: update Grub configuration instructions for Ubuntu (Service VM)

• 920f0270 - acrn: rename param in uart16550_init

• 2e10930d - Python scripts discovering CPU IDs are off by 1

• ef1c92e8 - fix typos in script

• 8896ba25 - Grammatical edits to Run Kata Containers doc

• 88dfd8d4 - doc: update Kata and ACRN tutorial

• e1eedc99 - Doc: Style updates to Building from Source doc

• 1f6c0cd4 - doc: update project’s target max LOC

• 8f9e4c2d - Updated grammar in ACRN industry scenario doc

• 54e9b562 - doc: Modify CL version from 32030 to 31670

• 1b3754aa - dm:passthrough opregion to uos gpu

• 4d882731 - dm:passthrough graphics stolen memory to uos gpu

• f9f64d35 - dm:reserve 64M hole for graphics stolen memory in e820 table

• 10c407cc - HV: init local variable before it is used.

• 086e0f19 - hv: fix pcpu_id mask issue in smp_call_function()

• a631c94c - doc: reset clear linux version and ootb command in getting start guide

• dbf9b933 - doc: update the “Using SDC Mode on the NUC” tutorial

• 809338a3 - Doc: Clarify Post-Launch VM data flow discussion for vuart conf

• fd4775d0 - hv: rename VECTOR_XXX and XXX_IRQ Macros

• b9086292 - hv: rename the ACRN_DBG_XXX

• 03f5c639 - dm:derive the prefetch property of PCI bar for pass-through device

• ceb197c9 - dm:keep pci bar property unchanged when updating pci bar address

• b59e5a87 - hv: Disable HLT and PAUSE-loop exiting emulation in lapic passthrough

• 3edde260 - hv: debug: show vcpu thread status in vcpu_list debug command

• db708fc3 - hv: rename is_completion_polling to is_polling_ioreq

• e4f5c1ef - version: 1.6-unstable

• 008c35a8 - Doc: Updated one paragraph in re_industry doc.

• 7cef407d - Doc: Fixed spelling error in the acrn_config_tool file.

• 02ce44ce - Doc: Style and grammar edits to GSG for ACRN Industry Scenario.

• e8512bf7 - Doc: Grammar updates to ACRN Config Tool doc.

• 54511773 - doc: update some xml elements description

• 9e244b1b - doc: update getting start guide about clear linux version and ootb commands

• 5f1fa3cf - doc: change version info

• 82b89fd0 - hv: check the validity of pdev in set_ptdev_intr_info

• fe03d870 - Doc: releasenotes_1.5 update

• e91ecaa7 - Doc: Grammar update to arcn_ootd.rst.

• 88644ab7 - Doc: document update base on release_v1.5

• 5267a977 - dm:replace perror with pr_err

• 0e47f0a8 - hv: fix potential NULL pointer reference in hc_assgin_ptdev

• ddebefb9 - hv: remove depreciated code for hc_assign/deassign_ptdev

• 96aba9bd - Doc: Grammatical edits to RN 1.5.

• 9b454dc4 - Doc: releasenotes_1.5

• 65ed6c35 - hv: vpci: trap PCIe ECAM access for SOS

• 1e50ec88 - hv: pci: use ECAM to access PCIe Configuration Space

• 57a36206 - acrn-config: set up whitelist for board containing hide pci device

• 65f3751e - hv: pci: add hide pci devices configuration for apl-up2

• 3239cb0e - hv: Use HLT as the default idle action of service OS

• 4303ccb1 - hv: HLT emulation in hypervisor

• a8f6bdd4 - hv: Add vlapic_has_pending_intr of apicv to check pending interrupts

• e3c30336 - hv: vcpu: wait and signal vcpu event support

• 1f23fe3f - hv: sched: simple event implementation

• 4115dd62 - hv: PAUSE-loop exiting support in hypervisor.

• bfecf30f - HV: do not offline pcpu when lapic pt disabled.

• c59f12da - doc: fix wrong Docker container image in tutorial.

• 41a998fc - hv: cr: handle control registers related to PCID.

• 4ae350a0 - hv: vmcs: pass-through instruction INVPCID to VM.

• d330879c - hv: cpuid: expose PCID related capabilities to VMs.

• 96331462 - hv: vmcs: remove redundant check on vpid.

• 5f2c303a - acrn-config: dump CPU info from /sys/devices/system/cpu/possible.

• 5d1a08fc - Doc: Added missing period in run_kata_containers file.

• 9071349a - doc: Update some of the wrong path in acrn configuration tool doc.

• e25a2bf8 - doc: add more details to the Kata Containers with ACRN tutorial.

• 933e2178 - dm: pci: reset passthrough device by default.

• 21b405d1 - hv: vpci: an assign PT device should support FLR or PM reset.

• e74a9f39 - hv: pci: add PCIe PM reset check.

• 26670d7a - hv: vpci: revert do FLR and BAR restore.

• 6c549d48 - hv: vpci: restore physical BARs when writing Command Register if necessary.

• 742abaf2 - hv: add sanity check for vuart configuration.

• c6f7803f - HV: restore lapic state and apic id upon INIT.

• ab132285 - HV: ensure valid vcpu state transition.

• a5158e2c - HV: refine reset_vcpu api.

• d1a46b82 - HV: rename function of vlapic_xxx_write_handler.

• 9ecac862 - HV: clean up redundant macro in lapic.h.

• 46ed0b15 - HV: correct apic lvt reset value.

• d4bf019d - Doc: Added Whiskey Lake specs to hardware ref page.

• 8a8438df - remove no support OS parts and add whl build.

• 58b3a058 - hv: vpci: rename pci_bar to pci_vbar.

• d2089889 - hv: pci: minor fix of coding style about pci_read_cap.

• cdf9d6b3 - (ia) devicemodel: refactor CMD_OPT_LAPIC_PT case branch.

• 77c3ce06 - acrn-config: remove unnecessary split for virtio-net

• ce35a005 - acrn-config: add cpu_sharing support for launch config.

• 3544f7c8 - acrn-config: add cpu_sharing info in launch xmls.

• 57939730 - HV: search rsdp from e820 acpi reclaim region.

• fc78013f - acrn-config: some cleanup for logical partition mode Linux bootargs.

• 8f9cda18 - DOC: Content edits to CPU Sharing doc.

• 651510a8 - acrn-config: add logger_setting into launch script.

• 7f74e6e9 - acrn-config: refine mount device for virtio-blk.

• fc357a77 - acrn-config: add tap_ prefix for virtio-net.

• 5b6a33bb - acrn-config: enable log_setting in all VMs.

• d4bf019d - Doc: Added Whiskey Lake specs to hardware ref page.

• 8a8438df - remove no support OS parts and add whl build.

• 58b3a058 - hv: vpci: rename pci_bar to pci_vbar.

• d2089889 - hv: pci: minor fix of coding style about pci_read_cap.

• cdf9d6b3 - (ia) devicemodel: refactor CMD_OPT_LAPIC_PT case branch.

• 77c3ce06 - acrn-config: remove unnecessary split for virtio-net

• ce35a005 - acrn-config: add cpu_sharing support for launch config.

• 3544f7c8 - acrn-config: add cpu_sharing info in launch xmls.

• 57939730 - HV: search rsdp from e820 acpi reclaim region.

• fc78013f - acrn-config: some cleanup for logical partition mode Linux bootargs.

• 8f9cda18 - DOC: Content edits to CPU Sharing doc.

• 651510a8 - acrn-config: add logger_setting into launch script.

• 7f74e6e9 - acrn-config: refine mount device for virtio-blk.

• fc357a77 - acrn-config: add tap_ prefix for virtio-net.

• 5b6a33bb - acrn-config: enable log_setting in all VMs.

• bb6e28e1 - acrn-config: check pass-through device for audio/audio_codec.

• 4234d2e4 - acrn-config: correct vuart1 setting in scenario config.

• d80a0dce - acrn-config: fix a few formatting issues.

• 051f277c - acrn-config: modify hpa start size value for logical_partition scenario.

• e5117bf1 - vm: add severity for vm_config.

• f7df43e7 - reset: detect highest severity guest dynamically.

• bfa19e91 - pm: S5: update the system shutdown logical in ACRN.

• 197e4a06 - acrn-config: add support to parse severity item tag.

• ca2855f2 - acrn-config: add severity setting to scenario config xml.

• a4085538 - Doc: Content edits to Running Kata containers on a Service VM doc.

• 9ee55965 - Doc: More edits to CPU Sharing doc.

• fcb85a80 - acrn-config: remove pcpu3 from vm1 in SDC scenario

• 1fddf943 - hv: vpci: restore PCI BARs when doing AF FLR

• a90e0f6c - hv: vpci: restore PCI BARs when doing PCIe FLR

• 3c2f4509 - Doc: Add v1.5 release menu choice.

• 3e45d5e3 - Doc: Content edit to cpu-sharing page.

• fa5922c8 - Doc: Content edit to rt_industry document.

• 17f6344c - doc: Add tutorial about how to launch kata vm.

• 2ceff270 - doc: modify Configuration Tools

• 7edf8ed7 - doc: add document for cpu sharing