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Kernel: Linux Work by Intel. Oracle, and AMD

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Linux
  • Intel Proposes Linux Kernel Driver Allow/Deny Filtering

    As part of their work around Trust Domain Extensions (TDX) support for Linux, Intel engineers are proposing a driver filter option for Linux to be able to set allow or deny lists of driver(s) that can or cannot be loaded by the booted kernel.

    In order to reduce the attack surface within guest virtual machines while still wanting to be able to use the same kernel build between a host and guest, Intel engineers are looking to add this driver filter support to the kernel. When booting the guest, via the kernel command-line they can just specify the specific drivers to allow to be loaded by the kernel or alternatively setting a list of specific drivers that shouldn't be allowed to be loaded by the system.

  • Oracle Working On BPF CO-RE Support For GCC To Easily Run BPF Programs On Any Kernel

    Running eBPF kernel programs continues to be increasing popular and used for a variety of use-cases in production environments but one of the challenges is around needing to compile the (e)BPF programs for a given kernel while BPF CO-RE has been working to change that. The LLVM Clang compiler already supports the ability for BPF "Compile Once, Run Everywhere" while now Oracle engineers are working to bring the same level of support to GCC.

  • AMD PTDMA Driver Revised Ahead Of Its Possible Inclusion For Linux 5.15 - Phoronix

    One of the AMD patch series that has been in the works for more than one year is the PTDMA driver providing pass-through DMA engine support on Linux. The driver is now up to its eleventh revision but the mainlining might happen soon.

    The AMD PTDMA Linux driver effort dates back to September 2019 for enabling their PTDMA controller in performing high bandwidth memory-to-memory and I/O copy operations. Modern AMD CPUs support multiple PTDMA controllers, the PTDMA driver hooks into the kernel's direct memory access (DMA) subsystem and is intended to be used with AMD Non-Transparent Bridge (NTB) devices but not for general purpose peripheral DMA.

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