New Release: Linux Kernel 5.10

Linux kernel 5.10 (available here) has been released. Here are the highlights from a Linux on Z perspective:

  • Crypto 
    • Added ability to transform secure private EP11 and CCA EC keys into protected EC private keys.
  • Networking
    • HiperSockets Converged Interface (HSCI): This feature allows to converge a HiperSockets device with a networking adapter (OSA-Express or RoCE Express) into a single logical interface. HiperSockets will be preferred whenever a peer has an HSCI using the same HiperSockets device. Otherwise, the external networking adapter will be used. This way, users can take advantage of the benefits of HiperSockets while retaining external connectivity through a single interface.
    • SMC-Dv2: Version 2 of SMC-D requires an IBM z15 and provides two major improvements:
      1. Removal of the same-subnet restriction: Peers that intend to communicate using SMC-D no longer need to be within the same IP subnet. I.e. any peer that is hosted on the same IBM Z machine can be reached using SMC-Dv2.
      2. No PNET ID configuration required: PNET IDs are no longer required to indicate ISM devices to be used with a certain IP interface. Any ISM device attached to the respective Linux instance with the PNET ID either not set or matching any other network device, and in use by both peers will be used for SMC-Dv2.
  • NVMe Devices 
    • IPL Load Normal Support: If a Linux instance is defined with a large memory size and booted from an NVMe device, time required for a reboot is reduced significantly by omitting memory clearing.
    • Stand-Alone Dump Support: It is now possible to trigger a dump by booting from a respectively prepared NVMe device.
  • Server Time Protocol leap seconds scheduling support, see this blog entry. 

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