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condition: add CPUFeature

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Taking a stab at implementing #14479.

Add {Condition,Assert}CPUFeature to `systemd-analyze` & friends. Implement it
by executing the CPUID instruction. Add tables for common x86/i386
features.

Tested via unit tests + checked that commands such as:

```bash
systemd-analyze condition 'AssertCPUFeature = rdrand'
```

Succeed as expected and that commands such as

```bash
systemd-analyze condition 'AssertCPUFeature = foobar'
```

Fail as expected. Finally, I have amended the `systemd.unit` manual page
with the new condition and the list of all currently supported flags.
This commit is contained in:
Giedrius Statkevičius
2021-02-17 15:31:29 +09:00
committed by Yu Watanabe
parent b1b4e9204c
commit 68337e55f6
6 changed files with 224 additions and 0 deletions
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man/systemd.unit.xml
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@@ -1489,6 +1489,68 @@
to the container and not the physically available ones.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>ConditionCPUFeature=</varname></term>
<listitem><para>Verify that a given CPU feature is available via the <literal>CPUID</literal>
instruction. This condition only does something on i386 and x86-64 processors. On other
processors it is assumed that the CPU does not support the given feature. It checks the leaves
<literal>1</literal>, <literal>7</literal>, <literal>0x80000001</literal>, and
<literal>0x80000007</literal>. Valid values are:
<literal>fpu</literal>,
<literal>vme</literal>,
<literal>de</literal>,
<literal>pse</literal>,
<literal>tsc</literal>,
<literal>msr</literal>,
<literal>pae</literal>,
<literal>mce</literal>,
<literal>cx8</literal>,
<literal>apic</literal>,
<literal>sep</literal>,
<literal>mtrr</literal>,
<literal>pge</literal>,
<literal>mca</literal>,
<literal>cmov</literal>,
<literal>pat</literal>,
<literal>pse36</literal>,
<literal>clflush</literal>,
<literal>mmx</literal>,
<literal>fxsr</literal>,
<literal>sse</literal>,
<literal>sse2</literal>,
<literal>ht</literal>,
<literal>pni</literal>,
<literal>pclmul</literal>,
<literal>monitor</literal>,
<literal>ssse3</literal>,
<literal>fma3</literal>,
<literal>cx16</literal>,
<literal>sse4_1</literal>,
<literal>sse4_2</literal>,
<literal>movbe</literal>,
<literal>popcnt</literal>,
<literal>aes</literal>,
<literal>xsave</literal>,
<literal>osxsave</literal>,
<literal>avx</literal>,
<literal>f16c</literal>,
<literal>rdrand</literal>,
<literal>bmi1</literal>,
<literal>avx2</literal>,
<literal>bmi2</literal>,
<literal>rdseed</literal>,
<literal>adx</literal>,
<literal>sha_ni</literal>,
<literal>syscall</literal>,
<literal>rdtscp</literal>,
<literal>lm</literal>,
<literal>lahf_lm</literal>,
<literal>abm</literal>,
<literal>constant_tsc</literal>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>AssertArchitecture=</varname></term>
<term><varname>AssertVirtualization=</varname></term>