2021-3-22 Meeting Meeting notes
- Jammy Zhou (Deactivated)
- Mike Holmes
Owned by Jammy Zhou (Deactivated)
Meeting Details
Topic: linaro-open-discussion meeting
Time: March 22 , 2021 10.00 AM London
Join Zoom Meeting
https://linaro-org.zoom.us/j/4417312160
Meeting ID: 441 731 2160
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Meeting ID: 441 731 2160
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Attendees
Lorenzo
- Vincent
- Jammy
- James Morse
- Souvik Chakravarty
- Jonathan
- Jean-Philippe
- Shameerali
- Salil
- Barry Song
- Yunsheng Lin
- Tao Zeng
Agenda
Confirmed topics
- CXL follow up discussion
- Feedback on the virtual CPU hotplug implementation with PSCI
- AOB
Meeting Notes
- CXL on memory (Jonathan presented several new slides after the introduction in last call)
- Handling of memory on Type 2 devices (like GPU), two modes:
- Host biased (coherency is managed as part of the host SoC)
- Device biased (device issues coherence messages)
- Vikram's question: how should it be presented by Firmware?
- Problem 1: normal memory at boot can't be offlined later
- Likely to need element of BIOS control
- Problem 2: pinned memory in region
- Patch sets under review to migrate memory out of ZONE_MOVABLE on pin
- Problem 1: normal memory at boot can't be offlined later
- Generic Initiator Reminder
- GI as bridge for CXL etc.
- Handling of memory on Type 2 devices (like GPU), two modes:
- Virtual CPU hotplug
- Salil shared some figures about QEMU boot time impact by the number of CPU cores
- Pre vCPU Init
- Post vCPU Init (but pre-VGIC Init)
- Post VGIC Init
- Pre Linux Kernel Load
- Post Kernel Load (But Pre SMBIOS setup)
- LP: we need to converge and do some wrap up for proposal
- Salil to share some details about how to get the figures
- Salil shared some figures about QEMU boot time impact by the number of CPU cores
- Recording: link (password: *92a8xSE)