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Kernel Work: Intel and VMware

Submitted by Roy Schestowitz on Wednesday 5th of May 2021 04:29:16 PM Filed under
Linux
  • Linux 5.13 Adds An Intel Cooling Driver To Downclock Your CPU At A Lower Threshold - Phoronix

    Linux 5.13 is introducing the "intel_tcc_cooling" driver for helping to cool newer Intel mobile/desktop CPUs by down-clocking the processor cores when crossing a lower threshold than is set by default.

    This new driver for Linux 5.13 allows setting a lower threshold / offset for the Thermal Control Circuit (TCC) activation temperature. Rather than waiting until the default TCC activation temperature is reached, Intel CPUs support applying an offset (the "TCC Offset") via an MSR if wanting to set the down-clocking to occur at a lower temperature over the default system critical temperature.

  • Intel Explores Write Protecting Page Tables Using Upcoming PKS Feature - Phoronix

    As an additional security measure for the Linux kernel, Intel engineers are exploring making kernel page tables read-only and to then only allow writing on a per-CPU basis when they need to be modified. This would be handled using the PKS functionality found with future Intel processors.

    For many months now Intel has been working on the infrastructure for Protection Keys for Supervisor support in the Linux kernel. Protection Keys for Supervisor (PKS) is coming with future Intel processors. PKS as the supervisor/kernel equivalent to the existing PKU functionality was initially prototyped as a way to prevent stray writes to persistent memory and safeguarding trusted keys within the Linux kernel. A new proof-of-concept posted on Tuesday would be using PKS for safeguarding page tables.

  • VMware Prepares Linux Driver For Next-Gen Virtual GPU - Phoronix

    While physical GPUs may be in short supply right now, VMware is preparing for "SVGA v3" as their next-gen virtual PCI graphics adapter for use within VMware virtual machines for graphics acceleration backed by the host. 

    VMware has long provided reliably Linux graphics acceleration to their virtual machines under Linux with their "SVGA" graphics adapter backed by a mainline, open-source driver stack. That's worked out well and is now being extended for VMware's forthcoming third iteration of SVGA. 

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