Hi James, It totally skipped my mind earlier to mention that apart from what I have already shared through the below repositories, and as discussed in early September on LOD, I have also been experimenting with another approach (nothing new but something similar and based on yours and JPBs suggestion) for VCPU Hotplug. It is a non-ACPI version and banks upon trapping KVM Host PSCI to user space (i.e. CPU_ON, CPU_OFF etc.) to let QEMU make the decisions i.e. whether CPUs could be made online or not. Most of the kernel patches i.e. at both guest and KVM level are already in place in your repository. I have changed the QEMU part (mostly inspired from JPBs work he shared earlier in June 2021).
This approach of course is not different than what you have already shared recently just that it can work without any ACPI exchanges (which as you mentioned could be frowned upon by the community) but still banks upon the QMP interface to hot-{add|remove} the vcpus at VMM/QEMU level. It goes without the mention that, even for this approach, we still would need to solve the present==possible related issues at the guest level which have been discussed earlier.
Would soon be sharing repository for this change as well soon (before next LOD meeting of 1st Nov?) so that we have everything on table to compare.
Hi Joyce, As I am still recovering from surgery and I am only able to occasionally access the laptop. Hence, for any communication on LOD including me please also CC on the below addresses as well:
salil.mehta@opnsrc.net/mehta.salil.lnk@gmail.com
Thanks for understanding!
Best regards Salil
-----Original Message----- From: James Morse [mailto:james.morse@arm.com] Sent: Thursday, October 20, 2022 4:06 PM To: Joyce Qi joyce.qi@linaro.org; Jonathan Cameron jonathan.cameron@huawei.com; Salil Mehta salil.mehta@huawei.com; Lorenzo Pieralisi lorenzo.pieralisi@linaro.org Cc: Jonathan Cameron via Linaro-open-discussions linaro-open-discussions@op-lists.linaro.org; linux@armlinux.org.uk Subject: Re: Linaro-open-discussions Digest, Vol 25, Issue 3
Hello,
I have two small topics that are relevant to CXL:
- maintaining the UEFI memory map with hotplug memory (series in development,
no ACPI changes needed)
- Cache invalidate for NVdimm unlock and erase (spec proposal which will need
a customer)
These would only take about thirty minutes, unless we want to go into all the gory details of the first one. I don't think its worth having the meeting just for these.
I've not got to rebase the virtual cpu hotplug stuff - I've been busy turning the MPAM stuff around this week. (and I'm out next monday)
Thanks,
James
On 20/10/2022 13:47, Joyce Qi wrote:
Hi Jonathan,Lorenzo,all,
Do we have any topic to sync on our LOD meeting next week?
Thanks:) Joyce
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(Salil Mehta)
Message: 1 Date: Mon, 17 Oct 2022 16:12:26 +0000 From: Salil Mehta salil.mehta@huawei.com Subject: [Linaro-open-discussions] Re: Invitation: Linaro Open Discussions monthly meeting @ Wed 5 Oct 2022 19:00 - 20:00 (HKT) (linaro-open-discussions@op-lists.linaro.org) To: "joyce.qi@linaro.org" joyce.qi@linaro.org, "james.morse@arm.com" james.morse@arm.com Cc: "linaro-open-discussions@op-lists.linaro.org" linaro-open-discussions@op-lists.linaro.org, "lorenzo.pieralisi@linaro.org" lorenzo.pieralisi@linaro.org, "ilkka@os.amperecomputing.com" ilkka@os.amperecomputing.com, Jean-Philippe Brucker jean-philippe.brucker@arm.com, "salil.mehta@opnsrc.net" salil.mehta@opnsrc.net Message-ID: 12408d4c06604dd4bd8e017adf7e5fe6@huawei.com Content-Type: text/plain; charset="utf-8"
Hi James, As discussed in the meeting below are the repositories which you might want
to have a look.
[1] Forward ported QEMU with some fixes was shared (by Salil) https://github.com/salil-mehta/qemu.git
virt-cpuhp-armv8/rfc-v1-port29092022
[2] James Approach with online-capable and present==possible (some fixes) https://github.com/salil-mehta/linux.git
virt-cpuhp-arm64/rfc-v2/jmorse-pres-eq-poss-cpu
[3] Variant of James approach with online-capable and conditionally present
cpus
https://github.com/salil-mehta/linux.gitvirt-cpuhp-arm64/rfc-v2/jmorse-variant-with-cond-present-cpu
I have also shared the LOD presentation with Joyce for uploading to the site.
Attachment: [1] Linaro Open Discussion Meeting Update - 05102022 - Salil_Mehta-fixed.pdf
Many thanks Salil
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