Hi Michael,
On 7/8/25 4:22 PM, Eric Auger wrote:
> This series enables ACPI PCI hotplug/hotunplug on ARM.
> It is not enabled by default and ACPI PCI hotplug can
> be selected by setting:
>
> -global acpi-ged.acpi-pci-hotplug-with-bridge-support=on
>
> Expected benefits should be similar to those listed in [1],
> ie. removal of some racy behaviors, improved latencies.
>
> The infrastructure used in x86 is heavily reused and a
> huge part of the series consists in moving code from
> hw/i386/acpi-build.c to a generic place and slightly
> adapting it to make it usable on ARM. The DSDT table is
> augmented to support ACPI PCI hotplug elements.
>
> On ARM we use use a GED event to notify the OS about
> hotplug events.
This morning Peter applied several series on target-arm.next and
9d8ade51a20d ("hw/arm/virt: Basic CXL enablement on pci_expander_bridge
instances pxb-cxl")
introduced a minor context conflict with my series (with
hw/pci-host/gpex-acpi: Use GED acpi pcihp property),
in hw/arm/virt-acpi-build.c. This is straightforward to fix.
I have a branch where this conflict is resolved
https://github.com/eauger/qemu.git
arm-acpi-pcihp-v6-on-target-arm.next
6a8c8f69a0 hw/pci-host/gpex-acpi: Use GED acpi pcihp property
Please let me know if you want me to respin
Eric
>
> Best Regards
>
> Eric
>
> This series can be found at:
> https://github.com/eauger/qemu/tree/arm-acpi-pcihp-v6
>
> previous series:
> https://github.com/eauger/qemu/tree/arm-acpi-pcihp-v5
>
> History:
> v5 -> v6:
> - collected Jonathan's R-bs
> - cropped last 2 patch commit messages (Jonathan)
>
> v4 -> v5:
> - Collected Jonathan's R-bs (many thanks!)
> - fixed the tests/qtest/bios-tables-test issue by
> creating a variant for the viot test
> - use the 3 phase reset API
> - fixed qom-test failures that were due to unconditionnal
> fetches of the GED property
>
> v3 -> v4:
> - toook into account all comments on v3
> - static acpi-index is now supported unconditionally
> from acpi pcihp option. See indiviual patches.
> - I hit a problem with ref block generation at
> [19/32] tests/qtest/bios-tables-test: Update ARM DSDT reference
> blobs: despite I regenerate the blobs, I get some errors.
>
> v2 -> v3:
> - lot of changes taking into account various feedbacks
> (many thanks to all reviewers). Please refer to
> individual patches for details. Main changes:
> - no more machine option, acpi pci hp is not set by
> default.
> - removal of 2 unused variables in the osc method
> - introduction of GED property to set the bus
> - rework of the init/reset sequence
> - fix virtio-mem-pci hotplug regression
>
> v1 -> v2:
> - collected a bunch of R-bs from Gustavo (many thanks!)
> - Fixed the breakage of bios-tables-test in TCG mode by
> incorporating Gustavo's patches (part of
> [PATCH 0/5] ACPI tests for PCI Hotplug on ARM
>
> https://lore.kernel.org/all/20250526053123.1434204-1-gustavo.rom...@linaro.org/)
> - Tweeked the dsdt aml changes to avoid any dsdt blob difference when
> acpi-pcihp is off.
>
> RFC -> v1:
> - First 3 trivial patches were pulled separately
> - Fix of the register region size (0x18), ie. ACPI_PCIHP_SIZE
> - addition of aml_pci_edsm which was not called in RFC
> - acpi-index feature is now fixed. vms->bus was not set on
> acpi_pcihp_init. The init sequence is still hacky though. Suggestions
> are welcome.
>
> [1] [PATCH v6 0/6] Use ACPI PCI hot-plug for Q35
> https://lore.kernel.org/all/20210713004205.775386-1-jus...@redhat.com/
>
>
> Eric Auger (32):
> hw/i386/acpi-build: Make aml_pci_device_dsm() static
> hw/acpi: Rename and move build_x86_acpi_pci_hotplug to pcihp
> hw/pci-host/gpex-acpi: Add native_pci_hotplug arg to
> acpi_dsdt_add_pci_osc
> hw/pci-host/gpex-acpi: Split host bridge OSC and DSM generation
> hw/acpi/ged: Add a acpi-pci-hotplug-with-bridge-support property
> hw/pci-host/gpex-acpi: Use GED acpi pcihp property
> hw/i386/acpi-build: Turn build_q35_osc_method into a generic method
> hw/pci-host/gpex-acpi: Use build_pci_host_bridge_osc_method
> tests/qtest/bios-tables-test: Update DSDT blobs after GPEX _OSC change
> hw/i386/acpi-build: Introduce build_append_pcihp_resources() helper
> hw/acpi/pcihp: Add an AmlRegionSpace arg to build_acpi_pci_hotplug
> hw/i386/acpi-build: Move build_append_notification_callback to pcihp
> hw/i386/acpi-build: Move build_append_pci_bus_devices/pcihp_slots to
> pcihp
> hw/i386/acpi-build: Use AcpiPciHpState::root in acpi_set_pci_info
> hw/i386/acpi-build: Move aml_pci_edsm to a generic place
> qtest/bios-tables-test: Prepare for fixing the aarch64 viot test
> qtest/bios-tables-test: Add a variant to the aarch64 viot test
> qtest/bios-tables-test: Generate DSDT.viot
> hw/arm/virt-acpi-build: Let non hotplug ports support static
> acpi-index
> tests/qtest/bios-tables-test: Update ARM DSDT reference blobs
> hw/arm/virt-acpi-build: Modify the DSDT ACPI table to enable ACPI PCI
> hotplug
> hw/acpi/ged: Add a bus link property
> hw/arm/virt: Pass the bus on the ged creation
> hw/acpi/ged: Call pcihp plug callbacks in hotplug handler
> implementation
> hw/acpi/pcihp: Remove root arg in acpi_pcihp_init
> hw/acpi/ged: Prepare the device to react to PCI hotplug events
> hw/acpi/ged: Support migration of AcpiPciHpState
> hw/core/sysbus: Introduce sysbus_mmio_map_name() helper
> hw/arm/virt: Minor code reshuffling in create_acpi_ged
> hw/arm/virt: Let virt support pci hotplug/unplug GED event
> qtest/bios-tables-test: Generate reference blob for
> DSDT.hpoffacpiindex
> qtest/bios-tables-test: Generate reference blob for DSDT.acpipcihp
>
> Gustavo Romero (4):
> tests/qtest/bios-tables-test: Prepare for changes in the DSDT table
> tests/qtest/bios-tables-test: Prepare for changes in the arm virt DSDT
> table
> tests/qtest/bios-tables-test: Prepare for addition of acpi pci hp
> tests
> tests/qtest/bios-tables-test: Add aarch64 ACPI PCI hotplug test
>
> hw/i386/acpi-build.h | 4 -
> include/hw/acpi/generic_event_device.h | 17 +-
> include/hw/acpi/pci.h | 5 +-
> include/hw/acpi/pcihp.h | 17 +-
> include/hw/arm/virt.h | 1 +
> include/hw/pci-host/gpex.h | 1 +
> include/hw/sysbus.h | 1 +
> hw/acpi/acpi-pci-hotplug-stub.c | 2 +-
> hw/acpi/generic_event_device.c | 77 +++
> hw/acpi/ich9.c | 7 +-
> hw/acpi/pci-bridge.c | 54 ++
> hw/acpi/pci.c | 50 ++
> hw/acpi/pcihp.c | 439 ++++++++++++++-
> hw/acpi/piix4.c | 5 +-
> hw/arm/virt-acpi-build.c | 38 ++
> hw/arm/virt.c | 27 +-
> hw/core/sysbus.c | 11 +
> hw/i386/acpi-build.c | 532 +-----------------
> hw/pci-host/gpex-acpi.c | 74 +--
> tests/qtest/bios-tables-test.c | 53 ++
> hw/arm/Kconfig | 2 +
> hw/pci-host/Kconfig | 1 +
> tests/data/acpi/aarch64/virt/DSDT | Bin 5196 -> 5293 bytes
> .../data/acpi/aarch64/virt/DSDT.acpihmatvirt | Bin 5282 -> 5379 bytes
> tests/data/acpi/aarch64/virt/DSDT.acpipcihp | Bin 0 -> 6202 bytes
> .../acpi/aarch64/virt/DSDT.hpoffacpiindex | Bin 0 -> 5347 bytes
> tests/data/acpi/aarch64/virt/DSDT.memhp | Bin 6557 -> 6654 bytes
> tests/data/acpi/aarch64/virt/DSDT.pxb | Bin 7679 -> 7768 bytes
> tests/data/acpi/aarch64/virt/DSDT.topology | Bin 5398 -> 5495 bytes
> tests/data/acpi/aarch64/virt/DSDT.viot | Bin 0 -> 5310 bytes
> tests/data/acpi/riscv64/virt/DSDT | Bin 3576 -> 3538 bytes
> tests/data/acpi/x86/microvm/DSDT.pcie | Bin 3023 -> 2985 bytes
> 32 files changed, 811 insertions(+), 607 deletions(-)
> create mode 100644 tests/data/acpi/aarch64/virt/DSDT.acpipcihp
> create mode 100644 tests/data/acpi/aarch64/virt/DSDT.hpoffacpiindex
> create mode 100644 tests/data/acpi/aarch64/virt/DSDT.viot
>
