From 17ca2c9c7956e975a48e64fd3f00a13ea8c2cf89 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Vin=C3=ADcius=20Ferr=C3=A3o?= <2031761+viniciusferrao@users.noreply.github.com> Date: Sun, 6 Sep 2026 03:36:22 -0300 Subject: [PATCH] docs(genesis): clarify s390x discovery --- .../developers/guides/code/genesis_openembedded_plan.rst | 3 +++ docs/source/guides/admin-guides/references/man8/mknb.8.rst | 2 +- xCAT-client/pods/man8/mknb.8.pod | 2 +- 3 files changed, 5 insertions(+), 2 deletions(-) diff --git a/docs/source/developers/guides/code/genesis_openembedded_plan.rst b/docs/source/developers/guides/code/genesis_openembedded_plan.rst index 7d05bfb8a..5b89a4e6a 100644 --- a/docs/source/developers/guides/code/genesis_openembedded_plan.rst +++ b/docs/source/developers/guides/code/genesis_openembedded_plan.rst @@ -105,6 +105,9 @@ The ``s390x`` image uses virtio networking under QEMU. QEMU does not emulate qeth, so the activation service exits without changing the virtio interface. Physical LPAR and z/VM Genesis networking remain unvalidated. Genesis does not use the shared CEC serial as an s390x node identifier. +QEMU guests report themselves as virtual nodes, so sequential and switch +discovery ignore them. Use profile discovery or assign a pending discovery +record with ``nodediscoverdef``. QEMU validation covers network IPL, DHCP option 209, TFTP, and the network-specific ``pxelinux.cfg``-style configuration written by ``mknb``. This release does not advertise a DPM boot configuration. diff --git a/docs/source/guides/admin-guides/references/man8/mknb.8.rst b/docs/source/guides/admin-guides/references/man8/mknb.8.rst index f64294fee..8a925e657 100644 --- a/docs/source/guides/admin-guides/references/man8/mknb.8.rst +++ b/docs/source/guides/admin-guides/references/man8/mknb.8.rst @@ -50,7 +50,7 @@ riscv64 nodes boot through UEFI firmware and grub2. For riscv64, \ **mknb**\ pu QEMU s390-ccw guests receive a network-specific \ ``pxelinux.cfg``\ -style configuration through DHCP option 209. The firmware resolves this name below \ ``pxelinux.cfg``\ . Leave \ ``noderes.netboot``\ unset while a QEMU s390x node uses Genesis discovery. s390x Genesis does not use the shared IBM Z machine serial as a node identifier. On physical IBM Z, Genesis accepts \ ``rd.znet=qeth,read,write,data[,option=value]``\ and activates qeth before NetworkManager starts. Without \ ``rd.znet``\ , it activates unconfigured qeth devices in layer 2 mode. Devices reported as configured by \ ``znetconf``\ are not regrouped. Genesis does not import DPM auto-configuration data. Layer 3 and IP-mode VSWITCH configurations require \ ``layer2=0``\ . QEMU validation covers network IPL through Genesis startup; the discovery exchange with xcatd remains unvalidated for s390x. Legacy xCAT z/VM operating-system provisioning remains unchanged. Physical LPAR and z/VM Genesis networking remain unvalidated because QEMU does not emulate qeth. -Run \ **makedhcp -n**\ after installing the s390x image and before booting s390x nodes. This adds the required DHCP option to existing configurations. +Run \ **makedhcp -n**\ after installing the s390x image and before booting s390x nodes. This regenerates the DHCP configuration with the required option. ******* diff --git a/xCAT-client/pods/man8/mknb.8.pod b/xCAT-client/pods/man8/mknb.8.pod index bd37db74f..6ea2b7077 100644 --- a/xCAT-client/pods/man8/mknb.8.pod +++ b/xCAT-client/pods/man8/mknb.8.pod @@ -32,7 +32,7 @@ riscv64 nodes boot through UEFI firmware and grub2. For riscv64, B publish QEMU s390-ccw guests receive a network-specific C-style configuration through DHCP option 209. The firmware resolves this name below C. Leave C unset while a QEMU s390x node uses Genesis discovery. s390x Genesis does not use the shared IBM Z machine serial as a node identifier. On physical IBM Z, Genesis accepts C and activates qeth before NetworkManager starts. Without C, it activates unconfigured qeth devices in layer 2 mode. Devices reported as configured by C are not regrouped. Genesis does not import DPM auto-configuration data. Layer 3 and IP-mode VSWITCH configurations require C. QEMU validation covers network IPL through Genesis startup; the discovery exchange with xcatd remains unvalidated for s390x. Legacy xCAT z/VM operating-system provisioning remains unchanged. Physical LPAR and z/VM Genesis networking remain unvalidated because QEMU does not emulate qeth. -Run B after installing the s390x image and before booting s390x nodes. This adds the required DHCP option to existing configurations. +Run B after installing the s390x image and before booting s390x nodes. This regenerates the DHCP configuration with the required option. =head1 OPTIONS