A quick set of notes on the discussion on vCPU hotplug.
Great to have Ed join the discussion. If we are going to
have further calls on this topic we may want to move the time to be
more friendly for the US.
* ACPI spec change via code first route approved.
* Kernel patches being reworked / rebased by ARM. Expected to be sent
out in 5.19 cycle.
* QEMU patches being updated by Huawei. Will do at least some light testing
and then push out a public git tree so that others can test - will aim
to do this so it aligns with kernel code availability.
* Ed (Ampere) gave an update to say they are interested in pushing this
forwards ASAP and have customer / OS vendor engagement which will be
very useful in moving towards a complete solution, particularly ensuring
good test coverage etc.
Noted that current QEMU patches may not cover all corner cases, for example
live migration of VMs that have vCPUs hotplugged. Might 'just work'
but we haven't tested it yet so probably not.
Given we didn't really add anything on DOE / SPDM over previous calls,
I don't plan to send out anything on that topic this time.
Thanks to Joyce for hosting the call. If I noted down anything wrong,
or incomplete let the list know.
You have been invited to the following event.
Title: Bigtop and OpenEuler
I would like to start a discussion about adding OpenEuler  into the
supported platforms of Bigtop . Persons or associations who are
interested and would like to cooperate are warmly welcome to join.
As this is the first meeting on this, let's limit our discussion in the
1. OpenEuler's current status and acceptance level by the community of Arm
2. From a technical viewpoint, what is required for adding a new platform
into Bigtop's supporting list.
 OpenEuler: openEuler is an open source, free Linux distribution
platform. The platform provides an open community for global developers.
OpenEuler is an open source project incubated and operated by the OpenAtom
 Bigtop: Bigtop support many Operating Systems, including Debian,
Ubuntu, CentOS, Fedora, openSUSE and many others. https://bigtop.apache.org/
When: Tue Mar 29, 2022 10am – 10:50am China Standard Time - Shanghai
Where: zoom meeting
Joining info: Join Zoom Meeting
https://linaro-org.zoom.us/j/97870076880 (ID: 97870076880)
Join by phone
(US) +1 877-853-5247
Joining notes: ------------Zoom for G Suite Add-On Help------------Meeting
* guodong.xu(a)linaro.org - organizer
* Notes - Bigtop and OpenEuler -
Invitation from Google Calendar: https://calendar.google.com/calendar/
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We don't have any topics for the meeting this month. Hence cancelling.
Following topics related to OP-TEE will be presented in Linaro Connect Tech
Day : Core Technologies
March 29. Feel free to join us there.
- OP-TEE and FF-A evolution
- OP-TEE Lightning Talk
(on behalf of OP-TEE team)
thanks for hosting this call today, some notes on the IORT RMR
- Patchset requiring a final review from ARM (upcoming) but should
be ready to be merged
- Handling of IO port access at 0x0 on !x86 to be fixed (caused by UEFI
allocating addresses starting at 0x0 for BARs and IORT RMR requiring
the OS to preserve the BAR value) in Linux but it does not affect the
upstreaming of patches (since the only platform where the issue
triggers does not have upstream IORT RMR tables)
- ACPICA pull request still not merged but on its way
- Targeting v5.19 kernel (probably via ACPI tree to avoid Linux ACPICA
- Repost of final version at v5.18-rc1
Thank you very much Joyce for hosting the call and for any questions
please reach out.
> -----Original Message-----
> From: Shameerali Kolothum Thodi
> Sent: 25 January 2022 13:14
> To: Jonathan Cameron <jonathan.cameron(a)huawei.com>; joyce.qi(a)linaro.org;
> Mike Holmes <mike.holmes(a)linaro.org>; lorenzo.pieralisi(a)arm.com;
> james.morse(a)arm.com; Linuxarm <linuxarm(a)huawei.com>
> Subject: RE: Invitation: Linaro Open Discussions @ Tue 25 Jan 2022 12pm -
> 1pm (CET) (jonathan.cameron(a)huawei.com)
> > -----Original Message-----
> > From: Jonathan Cameron
> > Sent: 25 January 2022 12:03
> > To: joyce.qi(a)linaro.org; Mike Holmes <mike.holmes(a)linaro.org>;
> > lorenzo.pieralisi(a)arm.com; james.morse(a)arm.com; Linuxarm
> > <linuxarm(a)huawei.com>; Shameerali Kolothum Thodi
> > <shameerali.kolothum.thodi(a)huawei.com>
> > Subject: RE: Invitation: Linaro Open Discussions @ Tue 25 Jan 2022
> > 12pm - 1pm (CET) (jonathan.cameron(a)huawei.com)
> > Some brief notes on the call. Feel free to point out what I noted down
> > Action items (AI) marked and approximate assignment in brackets.
> > Thanks to Joyce for hosting the call. As ever, very helpful to have this forum.
> > For future calls, topic requester to list who from Linaro engineering
> > teams might be interested to make sure we keep them in the loop.
> > Present,
> > ARM: Lorenzo Pieralisi, James Morse
> > Linaro: Joyce Qi
> > Huawei: Shameerali Kolothum, Jonathan Cameron
> > Next scheduled call in 1 month. Additional calls as necessary to push
> > forwards topics..
> > RMR progress.
> > --------------------
> > ACPICA / IORT spec issue due to lack of backwards compatibility. AI
> > (LP) to investigate.
> Hi Lorenzo,
> This is the initial implementation of ACPICA changes w.r.t revision E.c.
> For now, I am checking the RMR node revision and limit the support to only >=
Please let me know if there is any update on this... We need to get the ACPCIA changes
in for the kernel support ASAP. If you are Ok with the above patch I can send a pull request
for the same.