2019-10-24 07:29:52 +08:00
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.. _hostbridge_virt_hld:
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2021-02-13 08:27:24 +08:00
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Hostbridge Emulation
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2019-10-24 07:29:52 +08:00
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####################
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Overview
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********
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2021-11-25 03:18:19 +08:00
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Hostbridge emulation is based on PCI emulation; however, the hostbridge
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emulation only sets the PCI configuration space. The Device Model (DM) sets the
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PCI configuration space for hostbridge in the Service VM and then exposes it to
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the User VM to detect the PCI hostbridge.
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2019-10-24 07:29:52 +08:00
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2021-02-13 08:27:24 +08:00
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PCI Host Bridge and Hierarchy
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2019-10-24 07:29:52 +08:00
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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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2021-12-30 15:59:26 +08:00
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acrn-dm -m $mem_size -s 0:0,hostbridge \
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2019-10-24 07:29:52 +08:00
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-s 5,virtio-console,@stdio:stdio_port \
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-s 6,virtio-hyper_dmabuf \
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2021-11-25 03:18:19 +08:00
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-s 3,virtio-blk,/home/acrn/UserVM.img \
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2019-10-24 07:29:52 +08:00
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-s 4,virtio-net,tap0 \
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-s 7,virtio-rnd \
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--ovmf /usr/share/acrn/bios/OVMF.fd \
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$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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2019-11-08 07:24:31 +08:00
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2019-10-24 07:29:52 +08:00
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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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