[systemd-devel] [PATCH] systemd-detect-s390-virt: add virtualization detection on s390x

[Thomas Blume]

On Fri, 4 Jul 2014, Zbigniew Jędrzejewski-Szmek wrote:

>> +#if defined(__s390x__)
>> +        /* First layer virtualization (PR/SM) is always present on s390x */
>> +        _id = "PR/SM";
>> +        r = 1;
> What does this mean? Is it like XEN dom0, i.e. normianally a virtuallized OS,
> but one that has full access to hardware? We recently [1] started to report
> that as non-virtualized, because what matters is the ability to access hardware,
> and not the way that the system is built.
>
> [1] 37287585b6ba9a5

The difference is that on s390 there is no direct access to hardware on OS level.
See my reply to Lennart for further details.

>> +
>> +        /* Check for second layer virtualization */
>> +        _cleanup_fclose_ FILE *f = NULL;
>> +        char line[LINE_MAX];
>> +        f = fopen("/proc/sysinfo", "re");
>> +        if (f) {
>> +                FOREACH_LINE(line, f, return -errno) {
>> +                        if (startswith(line, "VM00 Control Program:")) {
>> +                                if (strstr(line,"z/VM"))
>> +                                        _id = "z/VM";
>> +                                else if (strstr(line,"KVM/Linux"))
>> +                                        _id = "KVM";
>> +                                break;
>> +                        }
>> +                }
>> +        }
> Can you use get_status_field for this?

ok

Regards
Thomas