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mirror_qemu/include/hw/acpi
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Ani Sinha 3d7e78aa77 Introduce a new flag for i440fx to disable PCI hotplug on the root bus 
We introduce a new global flag 'acpi-root-pci-hotplug' for i440fx with which
we can turn on or off PCI device hotplug on the root bus. This flag can be
used to prevent all PCI devices from getting hotplugged or unplugged from the
root PCI bus.
This feature is targetted mostly towards Windows VMs. It is useful in cases
where some hypervisor admins want to deploy guest VMs in a way so that the
users of the guest OSes are not able to hot-eject certain PCI devices from
the Windows system tray. Laine has explained the use case here in detail:
https://www.redhat.com/archives/libvir-list/2020-February/msg00110.html

Julia has resolved this issue for PCIE buses with the following commit:
530a096318 ("pcie_root_port: Add hotplug disabling option")

This commit attempts to introduce similar behavior for PCI root buses used in
i440fx machine types (although in this case, we do not have a per-slot
capability to turn hotplug on or off).

Usage:
   -global PIIX4_PM.acpi-root-pci-hotplug=off

By default, this option is enabled which means that hotplug is turned on for
the PCI root bus.

The previously existing flag 'acpi-pci-hotplug-with-bridge-support' for PCI-PCI
bridges remain as is and can be used along with this new flag to control PCI
hotplug on PCI bridges.

This change has been tested using a Windows 2012R2 server guest image and also
with a Windows 2019 server guest image on a Ubuntu 18.04 host using the latest
master qemu from upstream.

Signed-off-by: Ani Sinha <ani@anisinha.ca>
Message-Id: <20200821165403.26589-1-ani@anisinha.ca>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
 		2020-08-27 08:29:08 -04:00
..
acpi-defs.h acpi: Some build_tpm2() code reshape 2020-06-24 17:18:28 -04:00
acpi.h acpi: add acpi=OnOffAuto machine property to x86 and arm virt 2020-03-29 09:52:13 -04:00
acpi_dev_interface.h hw/arm: Use GED for system_powerdown event 2019-10-05 17:12:09 -04:00
aml-build.h acpi: Move build_tpm2() in the generic part 2020-06-09 12:46:45 -04:00
bios-linker-loader.h vmgenid: replace x-write-pointer-available hack 2017-09-08 16:15:17 +03:00
cpu.h typo: apci->acpi 2019-01-30 10:16:58 +01:00
cpu_hotplug.h Clean up header guards that don't match their file name 2016-07-12 16:19:16 +02:00
generic_event_device.h acpi: ged: rename event memory region 2020-06-12 10:17:06 -04:00
ghes.h ACPI: Record Generic Error Status Block(GESB) table 2020-05-14 15:03:09 +01:00
ich9.h Drop more @errp parameters after previous commit 2020-05-15 07:08:14 +02:00
ipmi.h ipmi: Fix SSIF ACPI handling to use the right CRS 2019-09-20 14:08:10 -05:00
memory_hotplug.h hw/acpi: Make ACPI IO address space configurable 2019-10-05 17:12:08 -04:00
pc-hotplug.h memhp: don't generate memory hotplug AML if it's not enabled/supported 2017-01-10 07:03:24 +02:00
pci.h include: Make headers more self-contained 2019-08-16 13:31:51 +02:00
pcihp.h Introduce a new flag for i440fx to disable PCI hotplug on the root bus 2020-08-27 08:29:08 -04:00
tco.h Include migration/vmstate.h less 2019-08-16 13:31:52 +02:00
tpm.h acpi: build TPM Physical Presence interface 2019-01-17 21:10:57 -05:00
utils.h hw/acpi: extract acpi_add_rom_blob() 2019-06-16 16:16:52 -04:00
vmgenid.h Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00