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From 4b41b0d24b5efe70a5d6a39ff7b1f6571a7315b5 Mon Sep 17 00:00:00 2001
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From: Thomas Blume <Thomas.Blume@suse.com>
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Date: Fri, 18 Jul 2014 09:13:36 -0400
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Subject: [PATCH] systemd-detect-virt: detect s390 virtualization
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A system that is running on a logical partition (LPAR) provided by
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PR/SM has access to physical hardware (except CPU). It is true that
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PR/SM abstracts the hardware, but only for sharing purposes.
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Details are statet at:
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http://publib.boulder.ibm.com/infocenter/eserver/v1r2/topic/eicaz/eicazzlpar.htm
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-->--
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In other words, PR/SM transforms physical resources into virtual resources so
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that many logical partitions can share the same physical resources.
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--<--
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Still, from the OS point of view, the shared virtual resource is real
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hardware. ConditionVirtualization must be set to false if the OS runs
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directly on PR/SM (e.g. in an LPAR).
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[zj: reorder code so that variables are not allocated when #if-def is
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false. Add commit message.]
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(cherry picked from commit f41925b4e442a34c93ad120ef1426c974a047ed1)
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---
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man/systemd.unit.xml | 1 +
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src/shared/virt.c | 17 +++++++++++++++++
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2 files changed, 18 insertions(+)
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diff --git a/man/systemd.unit.xml b/man/systemd.unit.xml
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index f66c580a37..e66be4ee51 100644
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--- a/man/systemd.unit.xml
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+++ b/man/systemd.unit.xml
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@@ -995,6 +995,7 @@
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virtualization solution, or one of
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<varname>qemu</varname>,
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<varname>kvm</varname>,
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+ <varname>zvm</varname>,
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<varname>vmware</varname>,
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<varname>microsoft</varname>,
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<varname>oracle</varname>,
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diff --git a/src/shared/virt.c b/src/shared/virt.c
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index 20a8d7c5bf..b4368952ff 100644
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--- a/src/shared/virt.c
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+++ b/src/shared/virt.c
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@@ -220,6 +220,23 @@ int detect_vm(const char **id) {
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goto finish;
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}
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+#if defined(__s390__)
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+ {
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+ _cleanup_free_ char *t = NULL;
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+
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+ r = get_status_field("/proc/sysinfo", "VM00 Control Program:", &t);
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+ if (r >= 0) {
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+ if (streq(t, "z/VM"))
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+ _id = "zvm";
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+ else
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+ _id = "kvm";
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+ r = 1;
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+
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+ goto finish;
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+ }
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+ }
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+#endif
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+
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r = 0;
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finish:
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