403 lines
16 KiB
ReStructuredText
403 lines
16 KiB
ReStructuredText
.. _partition_mode:
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Using partition mode on UP2
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###########################
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ACRN hypervisor supports partition mode, in which the User OS running in a
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privileged VM can bypass the ACRN hypervisor and directly access isolated
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PCI devices. This tutorial provides step by step instructions on how to set up
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the ACRN hypervisor partition mode on
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`UP2 <https://up-board.org/upsquared/specifications/>`_ boards running two
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privileged VMs as shown in :numref:`two-priv-vms`:
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.. figure:: images/partition_mode_up2.png
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:align: center
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:name: two-priv-vms
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Two privileged VMs running in partition mode
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Prerequisites
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*************
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In this tutorial two Linux privileged VMs are started by the ACRN hypervisor.
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To set up the Linux root filesystems for each VM, follow the Clear Linux
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`bare metal installation guide <https://clearlinux.org/documentation/clear-linux/get-started/bare-metal-install#bare-metal-install>`_
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to install Clear Linux on a **SATA disk** and a **USB flash disk** prior the setup,
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as the two privileged VMs will mount the root filesystems via the SATA controller
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and the USB controller respectively.
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Build kernel and modules for partition mode UOS
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***********************************************
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#. On your development workstation, clone the ACRN kernel source tree, and
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build the Linux kernel image that will be used to boot the privileged VMs:
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.. code-block:: none
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$ git clone https://github.com/projectacrn/acrn-kernel.git
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Cloning into 'acrn-kernel'...
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...
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$ cd acrn-kernel
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$ cp kernel_config_uos .config
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$ make olddefconfig
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scripts/kconfig/conf --olddefconfig Kconfig
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#
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# configuration written to .config
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#
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$ make
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$ make modules_install INSTALL_MOD_PATH=out/
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The last two commands built the bootable kernel image ``arch/x86/boot/bzImage``,
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and the loadable kernel modules under the ``./out/`` folder. Copy these files
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to a removable disk for installing on the UP2 board later.
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#. Current ACRN partition mode implementation requires a multi-boot capable
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bootloader to boot both ACRN hypervisor and the bootable kernel image
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built from the previous step. You could install Ubuntu OS to the UP2 board
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by following
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`this Ubuntu tutorial <https://tutorials.ubuntu.com/tutorial/tutorial-install-ubuntu-desktop>`_.
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The Ubuntu installer creates 3 disk partitions on the on-board eMMC memory.
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By default, the GRUB bootloader is installed on the ESP (EFI System Partition)
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partition, which will be used to bootstrap the partition mode ACRN hypervisor.
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#. After installing the Ubuntu OS, power off the UP2 board, attach the SATA disk
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and the USB flash disk to the board. Power on the board and make sure
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it boots the Ubuntu OS from the eMMC, then copy the loadable kernel modules
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built in Step 1 to the ``/lib/modules/`` folder on both the mounted SATA
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disk and USB disk. For example, assuming the SATA disk and USB flash disk
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are assigned to ``/dev/sda`` and ``/dev/sdb`` respectively, the following
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commands set up the partition mode loadable kernel modules onto the root
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filesystems to be loaded by the privileged VMs:
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.. code-block:: none
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# Mount the Clear Linux root filesystem on the SATA disk
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$ sudo mount /dev/sda3 /mnt
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$ sudo cp -r <kernel-modules-folder-built-in-step1>/lib/modules/* /mnt/lib/modules
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$ sudo umount /mnt
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# Mount the Clear Linux root filesystem on the USB flash disk
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$ sudo mount /dev/sdb3 /mnt
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$ sudo cp -r <path-to-kernel-module-folder-built-in-step1>/lib/modules/* /mnt/lib/modules
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$ sudo umount /mnt
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#. Copy the bootable kernel image to the ``/boot`` directory:
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.. code-block:: none
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$ sudo cp <path-to-kernel-image-built-in-step1>/bzImage /boot/
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Enable partition mode in ACRN hypervisor
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****************************************
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#. Before building the ACRN hypervisor, you need to figure out the I/O address
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of the serial port, and the PCI BAR addresses of the SATA controller and
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the USB controller on your UP2 board.
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Enter the following command to get the I/O addresses of the serial ports.
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UP2 boards support two serial ports. The addresses from the command
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output represent the I/O addresses of the serial port of the 10-pin side
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connector and the 40-pin expansion header respectively. You will need to
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connect the serial port to the development host, in order to access
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the ACRN serial console to switch between privileged VMs.
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.. code-block:: none
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:emphasize-lines: 1
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$ dmesg | grep ttyS
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[ 10.552369] dw-apb-uart.8: ttyS4 at MMIO 0x91524000 (irq = 4, base_baud = 115200) is a 16550A
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[ 10.552568] serial serial0: tty port ttyS4 registered
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[ 10.572344] dw-apb-uart.9: ttyS5 at MMIO 0x91522000 (irq = 5, base_baud = 115200) is a 16550A
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[ 10.572545] serial serial1: tty port ttyS5 registered
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The following command prints detailed information about all PCI buses
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and devices in the system. Look up the PCI BAR addresses of the SATA
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controller and the USB controller, record these addresses (highlighted below) for
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editing the source code later.
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.. code-block:: none
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:emphasize-lines: 1,9,10,14,22
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$ sudo lspci -vv
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...
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00:12.0 SATA controller: Intel Corporation Device 5ae3 (rev 0b) (prog-if 01 [AHCI 1.0])
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Subsystem: Intel Corporation Device 7270
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Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
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Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
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Latency: 0
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Interrupt: pin A routed to IRQ 123
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Region 0: Memory at 91514000 (32-bit, non-prefetchable) [size=8K]
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Region 1: Memory at 91537000 (32-bit, non-prefetchable) [size=256]
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Region 2: I/O ports at f090 [size=8]
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Region 3: I/O ports at f080 [size=4]
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Region 4: I/O ports at f060 [size=32]
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Region 5: Memory at 91536000 (32-bit, non-prefetchable) [size=2K]
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...
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00:15.0 USB controller: Intel Corporation Device 5aa8 (rev 0b) (prog-if 30 [XHCI])
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Subsystem: Intel Corporation Device 7270
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Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
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Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
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Latency: 0
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Interrupt: pin A routed to IRQ 122
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Region 0: Memory at 91500000 (64-bit, non-prefetchable) [size=64K]
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#. Clone the ACRN source code and configure the build options with
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``make menuconfig`` command:
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.. code-block:: none
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$ git clone https://github.com/projectacrn/acrn-hypervisor.git
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$ cd acrn-hypervisor/hypervisor
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$ make menuconfig
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Set the ``Hypervisor mode`` option to ``Partition mode``, and depending
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on the serial port you are using, enter its MMIO address to the configuration
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menu as shown in this screenshot. Finally, save the configuration.
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.. figure:: images/menuconfig-partition-mode.png
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:align: center
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#. Configure the PCI device info for each VM
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PCI devices that are available to the privileged VMs
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are hardcoded in the source file ``hypervisor/partition/apl-mrb/vm_description.c``.
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You need to review and modify the ``vpci_vdev_array1`` and ``vpci_vdev_array2``
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structures in the source code to match the PCI BAR addresses of the SATA
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controller and the USB controller noted in step 1:
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.. code-block:: none
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:emphasize-lines: 3,39,44,49,56,72
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:caption: hypervisor/partition/vm_description.c
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...
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static struct vpci_vdev_array vpci_vdev_array1 = {
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.num_pci_vdev = 2,
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.vpci_vdev_list = {
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{/*vdev 0: hostbridge */
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.vbdf.bits = {.b = 0x00U, .d = 0x00U, .f = 0x0U},
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.ops = &pci_ops_vdev_hostbridge,
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.bar = {},
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.pdev = {
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.bdf.bits = {.b = 0x00U, .d = 0x00U, .f = 0x0U},
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}
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},
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{/*vdev 1: SATA controller*/
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.vbdf.bits = {.b = 0x00U, .d = 0x01U, .f = 0x0U},
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.ops = &pci_ops_vdev_pt,
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.bar = {
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[0] = {
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.base = 0UL,
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.size = 0x2000UL,
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.type = PCIBAR_MEM32
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},
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[1] = {
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.base = 0UL,
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.size = 0x1000UL,
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.type = PCIBAR_MEM32
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},
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[5] = {
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.base = 0UL,
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.size = 0x1000UL,
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.type = PCIBAR_MEM32
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},
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},
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.pdev = {
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.bdf.bits = {.b = 0x00U, .d = 0x12U, .f = 0x0U},
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.bar = {
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[0] = {
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.base = 0x91514000UL,
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.size = 0x2000UL,
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.type = PCIBAR_MEM32
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},
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[1] = {
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.base = 0x91537000UL,
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.size = 0x100UL,
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.type = PCIBAR_MEM32
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},
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[5] = {
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.base = 0x91536000UL,
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.size = 0x800UL,
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.type = PCIBAR_MEM32
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},
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}
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...
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static struct vpci_vdev_array vpci_vdev_array2 = {
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.num_pci_vdev = 3,
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...
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{/*vdev 1: USB controller*/
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.vbdf.bits = {.b = 0x00U, .d = 0x01U, .f = 0x0U},
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.ops = &pci_ops_vdev_pt,
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.bar = {
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[0] = {
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.base = 0UL,
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.size = 0x10000UL,
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.type = PCIBAR_MEM32
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},
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},
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.pdev = {
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.bdf.bits = {.b = 0x00U, .d = 0x15U, .f = 0x0U},
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.bar = {
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[0] = {
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.base = 0x91500000UL,
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.size = 0x10000UL,
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.type = PCIBAR_MEM64
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},
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}
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...
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#. Optionally, configure the ``.bootargs`` kernel command line arguments
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The kernel command line arguments used to boot the privileged VMs are
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hardcoded as ``/dev/sda3`` to meet the Clear Linux automatic installation.
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In case you plan to use your customized root
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filesystem, you may optionally edit the ``root=`` parameter specified
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in the ``.bootargs`` field of the ``.vm_desc_array`` structure, to
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instruct the Linux kernel to mount the right disk partition:
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.. code-block:: none
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:emphasize-lines: 9-11,20-22
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:caption: hypervisor/partition/vm_description.c
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...
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/* Virtual Machine descriptions */
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.vm_desc_array = {
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{
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/* Internal variable, MUSTBE init to -1 */
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.vm_hw_num_cores = VM1_NUM_CPUS,
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.vm_pcpu_ids = &VM1_CPUS[0],
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...
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.bootargs = "root=/dev/sda3 rw rootwait noxsave maxcpus=2 nohpet console=hvc0 \
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console=ttyS2 no_timer_check ignore_loglevel log_buf_len=16M \
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consoleblank=0 tsc=reliable xapic_phys",
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.vpci_vdev_array = &vpci_vdev_array1,
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.mptable = &mptable_vm1,
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},
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{
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/* Internal variable, MUSTBE init to -1 */
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.vm_hw_num_cores = VM2_NUM_CPUS,
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.vm_pcpu_ids = &VM2_CPUS[0],
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...
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.bootargs = "root=/dev/sda3 rw rootwait noxsave maxcpus=2 nohpet console=hvc0 \
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console=ttyS2 no_timer_check ignore_loglevel log_buf_len=16M \
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consoleblank=0 tsc=reliable xapic_phys",
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.vpci_vdev_array = &vpci_vdev_array2,
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.mptable = &mptable_vm2,
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.lapic_pt = true,
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},
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}
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#. Build the ACRN hypervisor and copy the artifact ``acrn.32.out`` to the
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``/boot`` directory:
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.. code-block:: none
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$ make PLATFORM=sbl
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...
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$ sudo cp build/acrn.32.out /boot
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#. Modify the ``/etc/grub.d/40_custom`` file to create a new GRUB entry
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that will multi-boot the ACRN hypervisor and the UOS kernel image
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Append the following configuration to the ``/etc/grub.d/40_custom`` file:
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.. code-block:: none
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menuentry 'ACRN Partition Mode' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-e23c76ae-b06d-4a6e-ad42-46b8eedfd7d3' {
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recordfail
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load_video
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gfxmode $linux_gfx_mode
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insmod gzio
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insmod part_gpt
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insmod ext2
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echo 'Loading partition mode hypervisor ...'
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multiboot /boot/acrn.32.out
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module /boot/bzImage
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}
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Modify the ``/etc/default/grub`` file as follows to make the GRUB menu visible
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when booting:
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.. code-block:: none
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#GRUB_HIDDEN_TIMEOUT=0
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GRUB_HIDDEN_TIMEOUT_QUIET=false
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Re-generate the GRUB configuration file and reboot the UP2 board. Select
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the ``ACRN Partition Mode`` entry to boot the partition mode of the ACRN
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hypervisor, the hypervisor will start the privileged VMs automatically.
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.. code-block:: none
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$ sudo update-grub
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.. code-block:: console
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:emphasize-lines: 4
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Ubuntu
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Advanced options for Ubuntu
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System setup
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*ACRN Partition Mode
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Switch between privileged VMs
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*****************************
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Connect the serial port on the UP2 board to the development workstation.
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If you set the MMIO address of the serial port right while building the
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ACRN hypervisor, you should see the output from the ACRN serial console as below.
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You could then log in to the privileged VMs by ``sos_console`` command,
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and press :kbd:`CTRL+Space` keys to return to the ACRN serial console.
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.. code-block:: console
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:emphasize-lines: 14,31
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ACRN Hypervisor
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calibrate_tsc, tsc_khz=1094400
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[21017289us][cpu=0][sev=2][seq=1]:HV version 0.3-unstable-2018-11-08 12:41:24-ef974d1a-dirty DBG (daily tag:acrn-2018w45.3-140000p) build by clear, start time 20997424us
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[21034127us][cpu=0][sev=2][seq=2]:API version 1.0
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[21039218us][cpu=0][sev=2][seq=3]:Detect processor: Intel(R) Pentium(R) CPU N4200 @ 1.10GHz
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[21048422us][cpu=0][sev=2][seq=4]:hardware support HV
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[21053897us][cpu=0][sev=1][seq=5]:SECURITY WARNING!!!!!!
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[21059672us][cpu=0][sev=1][seq=6]:Please apply the latest CPU uCode patch!
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[21074487us][cpu=0][sev=2][seq=28]:Start VM1
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[21074488us][cpu=3][sev=2][seq=29]:Start VM2
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[21885195us][cpu=0][sev=3][seq=34]:vlapic: Start Secondary VCPU1 for VM[1]...
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[21889889us][cpu=3][sev=3][seq=35]:vlapic: Start Secondary VCPU1 for VM[2]...
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ACRN:\>
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ACRN:\>sos_console 1
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----- Entering Guest 1 Shell -----
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[ 1.997439] systemd[1]: Listening on Network Service Netlink Socket.
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[ OK ] Listening on Network Service Netlink Socket.
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[ 1.999347] systemd[1]: Created slice system-serial\x2dgetty.slice.
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[ OK ] Created slice system-serial\x2dgetty.slice.
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[ OK ] Listening on Journal Socket (/dev/log).
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...
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clr-932c8a3012ec4dc6af53790b7afbf6ba login: root
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Password:
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root@clr-932c8a3012ec4dc6af53790b7afbf6ba ~ # lspci
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00:00.0 Host bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series Host Bridge (rev 0b)
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00:01.0 SATA controller: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series SATA AHCI Controller (rev 0b)
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root@clr-932c8a3012ec4dc6af53790b7afbf6ba ~ #
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---Entering ACRN SHELL---
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ACRN:\>sos_console 2
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----- Entering Guest 2 Shell -----
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[ 1.490122] usb 1-4: new full-speed USB device number 2 using xhci_hcd
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[ 1.621311] usb 1-4: not running at top speed; connect to a high speed hub
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[ 1.627824] usb 1-4: New USB device found, idVendor=058f, idProduct=6387, bcdDevice= 1.01
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[ 1.628438] usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
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...
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clr-2e8082cd4fc24d57a3c2d3db43368d36 login: root
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Password:
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root@clr-2e8082cd4fc24d57a3c2d3db43368d36 ~ # lspci
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00:00.0 Host bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series Host Bridge (rev 0b)
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00:01.0 USB controller: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series USB xHCI (rev 0b)
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00:02.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)
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root@clr-2e8082cd4fc24d57a3c2d3db43368d36 ~ #
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