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[doc] usage: Add Selecting an IVSHMEM device

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Jonathan Rubenstein 2023-10-30 05:08:57 +02:00 committed by Geoffrey McRae
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37
doc/usage.rst
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@ -523,3 +523,40 @@ The rules are written as follows:
This capture interface also looks for and reads the value of the system
environment variable ``NVFBC_PRIV_DATA`` if it has been set, documentation on
its usage however is unavailable.
.. _host_select_ivshmem:
Selecting an IVSHMEM device
~~~~~~~~~~~~~~~~~~~~~~~~~~~
For those attaching multiple IVSHMEM devices to their Virtual Machines, you must
configure the Looking Glass host to use the correct device. By default the first
device is selected.
The ``os:shmDevice`` option configures which device is used. These are ordered
by PCI slot and count up from 0 (default), with 0 being the first IVSHMEM device
in the lowest slot.
.. code:: ini
[os]
; Select the second IVSHMEM device
shmDevice=1
.. note::
``os:shmDevice`` ignores the actual PCI slot number, instead selecting the
*N*\th slot occupied by an IVSHMEM device. For example: with only two IVSHMEM
devices in slots 0x03 and 0x05, the device in slot 0x03 will be referred to
by *0* (first shm device), and the device in 0x05 by *1* (second shm device).
PCI slot numbers are visible in Device Manager:
1. Double-click any "IVSHMEM device" in Device Manager (``devmgmt.msc``)
2. Find the slot number in the "Location:" field. (e.g. PCI slot 5)
You can also find a listing of IVSHMEM devices in the ``looking-glass-host.txt``
log file, with slot numbers shown next to "device" (asterisk indicates currently
selected device)::
[I] 19989544 … IVSHMEM 0 on bus 0x6, device 0x3, function 0x0
[I] 19990438 … IVSHMEM 1* on bus 0x6, device 0x5, function 0x0

2
doc/words.txt
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@ -56,11 +56,13 @@ realtime
renderer
repo
runtime
shm
submodule
submodules
spencercw
systemd
Threadripper
th
toolchain
tritanope
tunable