[Linaro-open-discussions] Notes on Linaro Open Discussions meeting 4 Nov 2020
lorenzo.pieralisi at arm.com
Fri Nov 6 14:36:15 UTC 2020
On Thu, Nov 05, 2020 at 12:36:21PM +0000, Jonathan Cameron via Linaro-open-discussions wrote:
> IORT - Reserve memory regions (RMR)
> * Shameer gave summary
> - IORT Revision E (https://developer.arm.com/documentation/den0049/latest/) introduced new node type.
> - A way to describe memory regions that should have unity mapping in the SMMU.
> - Use case is a PCIe RAID card that has FW that uses a pool of host memory (hidden from OS).
> * Status
> - Patches out for ACPICA
> - Question raised by ACPICA reviewers on whether spec is final
> - Spec appears final (Lorenzo to check) but may be minor unrelated fix in doc to come (Sami).
> - Patches out for kernel on relevant lists.
> - Mail from Steven Price (Arm) - (Sami Mujawar who was on the call also involved) interested for EFI
> framebuffer use case.
> * Open questions
> - Equivalent from AMD has flag to indicate that unity mapping only needed until driver has taken over
> (end of kernel boot assumed). Avoids and issue of holes in address space for VMs.
> - Huawei not raising this as a requirement, but Lorenzo observed interesting and deserves discussion.
May I ask a pointer pls to relevant AMD docs and patches (if there are any) ?
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