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qemu-options: document SMBIOS type 11 settings 

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20200923133804.2089190-4-berrange@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Daniel P. Berrangé 2020-09-23 14:38:04 +01:00 committed by Michael S. Tsirkin
parent 10c3666658
commit 48a7ff4d51
1 changed files with 41 additions and 0 deletions
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qemu-options.hx
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@ -2296,6 +2296,8 @@ DEF("smbios", HAS_ARG, QEMU_OPTION_smbios,
"-smbios type=4[,sock_pfx=str][,manufacturer=str][,version=str][,serial=str]\n"
" [,asset=str][,part=str][,max-speed=%d][,current-speed=%d]\n"
" specify SMBIOS type 4 fields\n"
"-smbios type=11[,value=str][,path=filename]\n"
" specify SMBIOS type 11 fields\n"
"-smbios type=17[,loc_pfx=str][,bank=str][,manufacturer=str][,serial=str]\n"
" [,asset=str][,part=str][,speed=%d]\n"
" specify SMBIOS type 17 fields\n",
@ -2319,6 +2321,45 @@ SRST
``-smbios type=4[,sock_pfx=str][,manufacturer=str][,version=str][,serial=str][,asset=str][,part=str]``
Specify SMBIOS type 4 fields
``-smbios type=11[,value=str][,path=filename]``
Specify SMBIOS type 11 fields
This argument can be repeated multiple times, and values are added in the order they are parsed.
Applications intending to use OEM strings data are encouraged to use their application name as
a prefix for the value string. This facilitates passing information for multiple applications
concurrently.
The ``value=str`` syntax provides the string data inline, while the ``path=filename`` syntax
loads data from a file on disk. Note that the file is not permitted to contain any NUL bytes.
Both the ``value`` and ``path`` options can be repeated multiple times and will be added to
the SMBIOS table in the order in which they appear.
Note that on the x86 architecture, the total size of all SMBIOS tables is limited to 65535
bytes. Thus the OEM strings data is not suitable for passing large amounts of data into the
guest. Instead it should be used as a indicator to inform the guest where to locate the real
data set, for example, by specifying the serial ID of a block device.
An example passing three strings is
.. parsed-literal::
-smbios type=11,value=cloud-init:ds=nocloud-net;s=http://10.10.0.1:8000/,\\
value=anaconda:method=http://dl.fedoraproject.org/pub/fedora/linux/releases/25/x86_64/os,\\
path=/some/file/with/oemstringsdata.txt
In the guest OS this is visible with the ``dmidecode`` command
.. parsed-literal::
$ dmidecode -t 11
Handle 0x0E00, DMI type 11, 5 bytes
OEM Strings
String 1: cloud-init:ds=nocloud-net;s=http://10.10.0.1:8000/
String 2: anaconda:method=http://dl.fedoraproject.org/pub/fedora/linux/releases/25/x86_64/os
String 3: myapp:some extra data
``-smbios type=17[,loc_pfx=str][,bank=str][,manufacturer=str][,serial=str][,asset=str][,part=str][,speed=%d]``
Specify SMBIOS type 17 fields
ERST