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Re: [Qemu-devel] [PATCH v3 0/4] acpi hotplug of devices behind a pci bri
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH v3 0/4] acpi hotplug of devices behind a pci bridge |
Date: |
Sun, 13 Oct 2013 23:51:42 +0300 |
On Mon, Oct 07, 2013 at 12:21:26PM +0300, Michael S. Tsirkin wrote:
> This is on top of patchset generating ACPI tables in qemu.
> Please review and consider for 1.7.
No comments, I assume it's ok to merge this.
> Changes from v2:
> - split new code out to a separate file: acpi/pcihp.c
> this way we can reuse it for q35 later
> - rebased on top of the latest acpi-build patchset
>
> Changes from v1:
> - fixed some bugs
> - fixed migration and cross version compatibility
> - rebased to latest bits
>
> This adds support for device hotplug behind pci bridges, by generating ACPI
> tables describing the current hierarchy.
> Bridge devices themselves need to be pre-configured on qemu command line.
>
> How to use:
> Describe buses on command line. E.g.:
> -device pci-bridge,id=bar,chassis_nr=1 -device
> virtio-net,netdev=bur,addr=0x1,id=far,bus=bar
> use monitor command for hotplug:
> device_del far
>
> We don't currently use QOM properties to generate this info since:
> - info about hotpluggability of devices is lacking
> - we need to list all devices and buses in a predictable order
> For now, add a pci core function to do the above predictable order
> walk.
>
> This is on top of acpi patchset posted previously.
> with a small patch adding a core function to walk all
> pci buses, on top.
> Can also be found in my git tree
> git://git.kernel.org/pub/scm/virt/kvm/mst/qemu.git acpi-bridges
>
> Portability:
> - Non x86 (or any Linux) platforms don't need any of this code.
> They can keep happily using SHPC the way
> they always did.
>
> Things to note:
>
> - Extensive use of glib completely removes
> pointer math: we use
> g_array_append_vals exclusively.
>
> - As was the case previously,
> systems that lack working iasl are detected at configure time,
> pre-generated hex files in source tree are used in this case.
> This addresses the concern with iasl/big-endian
> systems.
>
> - Cross version migration: when running with -M 1.6
> and older, new hotplug functionality is unavailable.
> All ACPI table generation is disabled.
> We present FW_CFG interface compatible with 1.6.
>
> Michael S. Tsirkin (4):
> pci: add pci_for_each_bus_depth_first
> pcihp: generalization of piix4 acpi
> piix4: add acpi pci hotplug support
> acpi-build: enable hotplug for PCI bridges
>
> include/hw/acpi/pcihp.h | 72 ++++++++++
> include/hw/i386/pc.h | 5 +
> include/hw/pci/pci.h | 14 ++
> hw/acpi/pcihp.c | 312 +++++++++++++++++++++++++++++++++++++++++++
> hw/acpi/piix4.c | 75 +++++++++--
> hw/i386/acpi-build.c | 346
> ++++++++++++++++++++++++++++++++++++++----------
> hw/pci/pci.c | 28 ++++
> hw/acpi/Makefile.objs | 2 +-
> hw/i386/acpi-dsdt.dsl | 34 +++--
> hw/i386/ssdt-pcihp.dsl | 11 +-
> 10 files changed, 794 insertions(+), 105 deletions(-)
> create mode 100644 include/hw/acpi/pcihp.h
> create mode 100644 hw/acpi/pcihp.c
>
> --
> MST
>