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man: extend Personality= docs a bit

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Let's make clear personalities are supported on ARM (as per
https://github.com/systemd/systemd/pull/26152#issuecomment-1400321944).

Also, clarify that on many archs this functionality is pretty pointless,
i.e. where only a single native arch was ever known.
This commit is contained in:
Lennart Poettering 2023-01-24 16:08:09 +01:00
parent 793fc32169
commit 4c8ca41fa5
1 changed files with 14 additions and 10 deletions
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24
man/systemd.exec.xml
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@ -1088,16 +1088,20 @@ CapabilityBoundingSet=~CAP_B CAP_C</programlisting>
<term><varname>Personality=</varname></term>
<listitem><para>Controls which kernel architecture <citerefentry
project='man-pages'><refentrytitle>uname</refentrytitle><manvolnum>2</manvolnum></citerefentry> shall report,
when invoked by unit processes. Takes one of the architecture identifiers <constant>x86</constant>,
<constant>x86-64</constant>, <constant>ppc</constant>, <constant>ppc-le</constant>, <constant>ppc64</constant>,
<constant>ppc64-le</constant>, <constant>s390</constant> or <constant>s390x</constant>. Which personality
architectures are supported depends on the system architecture. Usually the 64bit versions of the various
system architectures support their immediate 32bit personality architecture counterpart, but no others. For
example, <constant>x86-64</constant> systems support the <constant>x86-64</constant> and
<constant>x86</constant> personalities but no others. The personality feature is useful when running 32-bit
services on a 64-bit host system. If not specified, the personality is left unmodified and thus reflects the
personality of the host system's kernel.</para></listitem>
project='man-pages'><refentrytitle>uname</refentrytitle><manvolnum>2</manvolnum></citerefentry> shall
report, when invoked by unit processes. Takes one of the architecture identifiers
<constant>arm64</constant>, <constant>arm64-be</constant>, <constant>arm</constant>,
<constant>arm-be</constant>, <constant>x86</constant>, <constant>x86-64</constant>,
<constant>ppc</constant>, <constant>ppc-le</constant>, <constant>ppc64</constant>,
<constant>ppc64-le</constant>, <constant>s390</constant> or <constant>s390x</constant>. Which
personality architectures are supported depends on the kernel's native architecture. Usually the
64bit versions of the various system architectures support their immediate 32bit personality
architecture counterpart, but no others. For example, <constant>x86-64</constant> systems support the
<constant>x86-64</constant> and <constant>x86</constant> personalities but no others. The personality
feature is useful when running 32-bit services on a 64-bit host system. If not specified, the
personality is left unmodified and thus reflects the personality of the host system's kernel. This
option is not useful on architectures for which only one native word width was ever available, such
as <constant>m68k</constant> (32bit only) or <constant>alpha</constant> (64bit only).</para></listitem>
</varlistentry>
<varlistentry>