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zdev: Add auto-config for PCI and crypto devices

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PCI and crypto devices defined using the IBM Z Dynamic Partition Manager
(DPM) will start in an offline/unconfigured state that requires manual
intervention before the associated Linux function can be used. This
results for example in PCI networking interfaces being unavailable in a
distribution installer system.

Fix this by providing a udev rule and initial RAM-disk logic that
automatically enables PCI and crypto devices either during boot, or when
they are defined at run-time. This processing can be suppressed by
specifying the "rd.zdev=no-auto" parameter on the kernel command line.

Auto-configuration is limited to Linux running in DPM LPARs because
PCI-functions and crypto devices defined by DPM are always intended for
use by a single LPAR only.

For Linux running in classic-mode LPARs or virtual machines, leaving PCI
and crypto devices in an offline state may be useful to allow defining a
device as available to multiple systems, where only the system that
intends to make use of the device should enable it.

Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Peter Oberparleiter
2021-09-22 16:23:59 +02:00
committed by Jan Höppner
parent 8c6c2ef30e
commit 3949c62f6f
7 changed files with 104 additions and 6 deletions
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7
zdev/dracut/95zdev/module-setup.sh
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@@ -20,7 +20,7 @@ check() {
[ "$_arch" = "s390" -o "$_arch" = "s390x" ] || return 1
# Ensure that required tools are available
require_binaries chzdev lszdev || return 1
require_binaries chzdev lszdev /lib/s390-tools/zdev_id || return 1
return 0
}
@@ -40,11 +40,14 @@ install() {
local _tempfile
# Ensure that required tools are available
inst_multiple chzdev lszdev vmcp
inst_multiple chzdev lszdev vmcp /lib/s390-tools/zdev_id
# Hook to parse zdev kernel parameter
inst_hook cmdline 95 "$moddir/parse-zdev.sh"
# Rule to automatically enable devices when running in DPM
inst_rules "81-dpm.rules"
# Obtain early + root device configuration
_tempfile=$(mktemp --tmpdir dracut-zdev.XXXXXX)
chzdev --export "$_tempfile" --persistent --by-path / --quiet \