Re: [PATCH v4 0/6] Only generate cluster node in PPTT when specified

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Nov 01, 2022 at 03:10:42PM +0800, Yicong Yang wrote:
> From: Yicong Yang <yangyicong@hisilicon.com>
> 
> This series mainly change the policy for building a cluster topology node
> in PPTT. Previously we'll always build a cluster node in PPTT without
> asking the user, after this set the cluster node will be built only the
> the user specify through "-smp clusters=X".
> 
> One problem is related to this but not fully caused by this, see the
> discussion in [*]. When booting the VM with `-smp 8` and 4 numa nodes,
> the linux scheduling domains in the VM misses the NUMA domains. It's
> because the MC level span extends to Cluster level (which is generated
> by the Qemu by default) that spans all the cpus in the system, then the
> scheduling domain building stops at MC level since it already includes all
> the cpus.
> 
> Considering cluster is an optional level and most platforms don't have it,
> they may even don't realize this is built and a always build policy cannot
> emulate the real topology on these platforms. So in this series improve the
> policy to only generate cluster when the user explicitly want it.
> 
> Update the tests and test tables accordingly.

To merge this to master we also need to update the new
tests/data/acpi/virt/PPTT.acpihmatvirt

I could do so myself but I'd rather you did the rebase and verified
the diff manually. If the diff is the same no need to update
commit log just the binaries.

Thanks!



> [*] https://lore.kernel.org/lkml/2c079860-ee82-7719-d3d2-756192f41704@huawei.com/
> 
> Change since v3:
> - Improve and attach the diff of the affected ACPI tables in the commit, and minor cleanups
> Link: https://lore.kernel.org/qemu-devel/20221031090523.34146-1-yangyicong@huawei.com/
> 
> Change since v2:
> - Add tag from Micheal, thanks
> - Handle the tests changes with bios-tables-test-allowed-diff.h, Per Micheal
> - Address the comments per Yanan
> Link: https://lore.kernel.org/qemu-devel/20221027032613.18377-1-yangyicong@huawei.com/
> 
> Change since v1:
> - Only includes the test tables which is really needed
> - Enrich the commit
> Link: https://lore.kernel.org/qemu-devel/20220922131143.58003-1-yangyicong@huawei.com/
> 
> Yicong Yang (6):
>   tests: virt: Allow changes to PPTT test table
>   hw/acpi/aml-build: Only generate cluster node in PPTT when specified
>   tests: virt: Update expected ACPI tables for virt test
>   tests: acpi: Add and whitelist *.topology blobs
>   tests: acpi: aarch64: Add topology test for aarch64
>   tests: acpi: aarch64: Add *.topology tables
> 
>  hw/acpi/aml-build.c                |   2 +-
>  hw/core/machine-smp.c              |   2 ++
>  include/hw/boards.h                |   3 +++
>  qemu-options.hx                    |   3 +++
>  tests/data/acpi/virt/APIC.topology | Bin 0 -> 700 bytes
>  tests/data/acpi/virt/DSDT.topology | Bin 0 -> 5398 bytes
>  tests/data/acpi/virt/PPTT          | Bin 96 -> 76 bytes
>  tests/data/acpi/virt/PPTT.topology | Bin 0 -> 336 bytes
>  tests/qtest/bios-tables-test.c     |  19 +++++++++++++++++++
>  9 files changed, 28 insertions(+), 1 deletion(-)
>  create mode 100644 tests/data/acpi/virt/APIC.topology
>  create mode 100644 tests/data/acpi/virt/DSDT.topology
>  create mode 100644 tests/data/acpi/virt/PPTT.topology
> 
> -- 
> 2.24.0