43 lines
1.6 KiB
ReStructuredText
43 lines
1.6 KiB
ReStructuredText
.. _hostbridge_virt_hld:
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Hostbridge emulation
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####################
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Overview
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********
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Hostbridge emulation is based on PCI emulation; however, the hostbridge emulation only sets the PCI configuration space. The device model sets the PCI configuration space for hostbridge in the Service VM and then exposes it to the User VM to detect the PCI hostbridge.
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PCI Host Bridge and hierarchy
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*****************************
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There is PCI host bridge emulation in DM. The bus hierarchy is determined by ``acrn-dm`` command line input. Using this command line, as an example::
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acrn-dm -A -m $mem_size -s 0:0,hostbridge \
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-s 2,pci-gvt -G "$2" \
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-s 5,virtio-console,@stdio:stdio_port \
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-s 6,virtio-hyper_dmabuf \
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-s 3,virtio-blk,/home/clear/uos/uos.img \
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-s 4,virtio-net,tap0 \
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-s 7,virtio-rnd \
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--ovmf /usr/share/acrn/bios/OVMF.fd \
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$pm_channel $pm_by_vuart $pm_vuart_node \
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$logger_setting \
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--mac_seed $mac_seed \
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$vm_name
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the bus hierarchy would be:
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.. code-block:: console
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# lspci
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00:00.0 Host bridge: Network Appliance Corporation Device 1275
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00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
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00:03.0 SCSI storage controller: Red Hat, Inc. Virtio block device
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00:05.0 Serial controller: Red Hat, Inc. Virtio console
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00:06.0 RAM memory: Intel Corporation Device 8606
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00:08.0 Network and computing encryption device: Red Hat, Inc. Virtio RNG
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00:09.0 Ethernet controller: Red Hat, Inc. Virtio network device
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.. note:: For Clear Linux OS, the ``lspci`` command can be installed from the ``sysadmin-basic`` bundle.
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