Passthrough the host BIOS DMI info to a QEMU VM

Step-by-step guide

In the host (real hardware), obtain the data to pass through:

function DMI {  # Get DMI value and XML-escape it
    sudo sed \
        's/&/\&amp;/g; s/</\&lt;/g; s/>/\&gt;/g; s/"/\&quot;/g; s/'"'"'/\&#39;/g' \
        "/sys/class/dmi/id/$1"
}
cat <<EOF && unset -f DMI
  <qemu:commandline>
    <qemu:arg value="-smbios"/>
    <qemu:arg value="type=1,manufacturer=$(DMI sys_vendor),product=$(DMI product_name),\
version=$(DMI product_version),serial=$(DMI product_serial),uuid=$(DMI product_uuid),\
sku=$(DMI product_sku),family=$(DMI product_family)"/>
  </qemu:commandline>
EOF

Open Virtual Machine Manager, go to Edit ➔ Preferences ➔ General and ensure Enable XML editing is ON
Shut down the VM
Go to the VM Details view (where you can add or remove hardware)

Open the XML tab, and add the following qemu XML namespace to <domain> (if not already present):

<domain xmlns:qemu="http://libvirt.org/schemas/domain/qemu/1.0" type="kvm">
<!--    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                        add this if not present                    -->

Somewhere inside <domain>, paste the output generated at STEP 1, for example:

<domain xmlns:qemu="http://libvirt.org/schemas/domain/qemu/1.0" type="kvm">
  <name>VM_NAME</name>
  <uuid>VM_UUID</uuid>
  <qemu:commandline>
    <qemu:arg value="-smbios"/>
    <qemu:arg value="type=1,manufacturer=XXXXXXXX,product=XXXXXXXX,version=XXXXXXXX,serial=XXXXXXXX,uuid=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx,sku=XXXXXXXX,family=XXXXXXXX"/>
  </qemu:commandline>
  <!-- Rest of the values [...]  -->
</domain>

Click Apply and make sure the <qemu:commandline> element isn't deleted (in my case it was moved to the end of the XML)
Power on the VM again

franferrax/README.md

Passthrough the host BIOS DMI info to a QEMU VM

Step-by-step guide

Consulted sources: