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
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acpi_dev_interface.h	hw/arm: Use GED for system_powerdown event	2019-10-05 17:12:09 -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
aml-build.h	acpi: Move build_tpm2() in the generic part	2020-06-09 12:46:45 -04:00
bios-linker-loader.h
cpu_hotplug.h
cpu.h
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
pci.h
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
tpm.h
utils.h
vmgenid.h	Include hw/qdev-properties.h less	2019-08-16 13:31:53 +02:00