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cpi: Introduce new udev rule and integrate with systemd unit

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Add a new udev rule that is triggered when a KVM VM is started
on the system the very first time. This rule reports over the
sysfs CPI kernel interface that the system is a KVM host.

Currently the cpi.service systemd unit already works with
the CPI sysfs interface. Introduce a new internal utility
script "cpictl" that is used by both the udev rule and
the systemd unit to guarantee coordinated access to the
kernel CPU interface.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Reviewed-by: Viktor Mihajlovski <mihajlov@linux.vnet.ibm.com>
Reviewed-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
This commit is contained in:
Claudio Imbrenda
2017-09-05 10:49:30 +02:00
committed by Michael Holzheu
parent 8ff6af3a4b
commit ca50924acb
6 changed files with 294 additions and 8 deletions
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systemd/cpi.service.in
+1 -7
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@@ -35,12 +35,6 @@ EnvironmentFile=/etc/sysconfig/cpi
# Environment=CPI_SYSTEM_LEVEL=
# Environment=CPI_SYSTEM_TYPE=LINUX
#
# Apply settings
ExecStartPre=/bin/sh -c 'if test -n "$CPI_SYSTEM_TYPE"; then echo $CPI_SYSTEM_TYPE |tr a-z A-Z > /sys/firmware/cpi/system_type; fi'
ExecStartPre=/bin/sh -c 'if test -n "$CPI_SYSTEM_NAME"; then echo $CPI_SYSTEM_NAME |tr a-z A-Z > /sys/firmware/cpi/system_name; fi'
ExecStartPre=/bin/sh -c 'if test -n "$CPI_SYSPLEX_NAME"; then echo $CPI_SYSPLEX_NAME |tr a-z A-Z > /sys/firmware/cpi/sysplex_name; fi'
ExecStartPre=/bin/sh -c 'test -n "$CPI_SYSTEM_LEVEL" || CPI_SYSTEM_LEVEL="$(uname -r)" ; echo $CPI_SYSTEM_LEVEL |cut -d- -f1 | tr . " " |xargs printf "0x0000000000%02x%02x%02x\n" > /sys/firmware/cpi/system_level'
#
# Sending data to the HMC/SE
ExecStart=/bin/sh -c 'echo 1 > /sys/firmware/cpi/set'
ExecStart=@toolslib_path@/cpictl -e