On Wed, 4 Jun 2025 12:52:29 +0100 Alireza Sanaee via <qemu-devel@nongnu.org> wrote:
> OS like Linux is using PPTT processor node's identical implementation > flag [1] to infer whether the whole system or a certain CPU cluster is > homogeneous or not [2]. QEMU currently only support building > homogeneous system, set the flag to indicate the fact. Build a root > node in PPTT for indicates the identical implementation which is > needed for a multi-socket system. Update the related PPTT tables as > well. > > We observed an issue interacting with Loongarch with this patchset, > and there was a discussion about it in [3], and eventually thanks to > Bibo we have a patchset that fixed the interactions with Loongarch in > the [4]. > > History: > * v5->v6: Rebased on 09be8a511a2e278b45729d7b065d30c68dd699d0 > * v4->v5: fixed a typo > * v3->v4: PPTT rev to 2 > * v2->v3: rebase to 10 > > [1] ACPI 6.5 Table 5.158: Processor Structure Flags > [2] > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/acpi/pptt.c?h=v6.11-rc1#n810 > [3] > https://lore.kernel.org/all/99a37f40-56dc-ab7a-86ff-1a9dcb3cc...@loongson.cn/ > [4] > https://lore.kernel.org/qemu-devel/20250604065502.1114098-1-maob...@loongson.cn/ > > DEPEND-ON: Message-ID: <20250604065502.1114098-1-maob...@loongson.cn> > > Yicong Yang (4): > tests: virt: Allow changes to PPTT test table > hw/acpi/aml-build: Set identical implementation flag for PPTT > processor nodes > hw/acpi/aml-build: Build a root node in the PPTT table > tests: virt: Update expected ACPI tables for virt test > > hw/acpi/aml-build.c | 24 > +++++++++++++++--- tests/data/acpi/aarch64/virt/PPTT | > Bin 76 -> 96 bytes .../data/acpi/aarch64/virt/PPTT.acpihmatvirt | > Bin 156 -> 176 bytes tests/data/acpi/aarch64/virt/PPTT.topology | > Bin 336 -> 356 bytes 4 files changed, 20 insertions(+), 4 deletions(-) > Hi Michael, Just a reminder on this set. Hope this time it is OK with Loongarch. Thanks, Alireza
