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changes.mady.by.user Gunnar Andersson

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changes.mady.by.user Dmitry Morozov

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Minute takers according to this page 


April 9, 2019

Participants

  • Gunnar
  • Matti
  • Dmitry
  • Franz
  • Artem
  • Bernard
  • Philippe

Minutes

Booting

  • OpenSynergy proposes AEM EBBR (https://github.com/ARM-software/ebbr). Gunnar is OK and asks about VirtIO support. Matti points to the TianoCore EDK2 project that has support for both VirtIO and XenBus (https://github.com/tianocore/edk2). 
  • Gunnar creates a new "Booting" chapter in the specification (to be filled).
  • Matti: Linux and Android have different requirements for booting: Android needs specific parameters to be passed. U-Boot has a special vboot (verified boot) utility. With EBBR we can pass those as UEFI vars (https://github.com/tianocore/tianocore.github.io/wiki/ArmPlatformPkg-AArch64).
  • Franz: we should not specify strict requirements for booting and any specific APIs. Gunnar: we are not specifying how a hypervisor must boot, just that a hypervisor supports booting in this way as well. For some devices we need to have strict rules as we are working on the specification. Matti: the booting procedure description tells how to boot a guest under a hypervisor, not about booting a hypervisor on some particular hardware.

ARM SBSA Debrief Contd

  • Gunnar continues on power states. Matti: PSCI is very arch pecific. Gunnar: we might place a requirement: if ARM, then use PSCI. Matti  2 Artem:  does Xen use PSCI? Artem: On ARM - yes. There are new power management functions yet to be merged. Those will be covered by a new SCMI spec. Franz: PikeOS also uses PSCI.
  • Gunnar: is PSCI supported on all ARM architectures? Matti: no. Custom interfaces can be implemented for legacy solutions. Franz has concerns about performance.
  • Gunnar: EPAM suggests SCMI for sensors. Matti agrees with the proposal. Matti: not all HW platforms support SCMI. Pure virtualized SCMI solutions and solutions with HW assisted SCMI virtualization might exist. SCMI is also not really ARM specific. Bernard can check for available ARM experts to discuss this on AMM.
  • Gunnar wants to discuss platform independent 


April 2, 2019

Participants

  • Kai
  • Gunnar
  • Matti
  • Dmitry
  • Franz
  • Kai
  • Matt
  • Philippe

...

an white paper released by Arm which gives and insight into the architectural updates in Armv8.4 in the Trustzone:
https://community.arm.com/processors/b/blog/posts/architecting-more-secure-world-with-isolation-and-virtualization
  • Gunnar wants to discuss platform independent