condition: add CPUFeature

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

									
										src/basic/virt.h
									
		+1
		
												View File
												
				@@ -61,3 +61,4 @@ int running_in_chroot(void);

				const char *virtualization_to_string(int v) _const_;

				int virtualization_from_string(const char *s) _pure_;

				bool has_cpu_with_flag(const char *flag);