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_interface.c
acpi-stub.c
acpi-x86-stub.c
aml-build-stub.c
aml-build.c
bios-linker-loader.c
core.c	acpi: accept byte and word access to core ACPI registers	2020-07-22 07:57:07 -04:00
cpu_hotplug.c	qom: Put name parameter before value / visitor parameter	2020-07-10 15:18:08 +02:00
cpu.c
generic_event_device.c
ghes.c	ACPI: Assert that we don't run out of the preallocated memory	2020-07-27 16:12:10 +01:00
hmat.c
hmat.h
ich9.c	qom: Put name parameter before value / visitor parameter	2020-07-10 15:18:08 +02:00
ipmi-stub.c
ipmi.c
Kconfig
memory_hotplug.c
meson.build	meson: convert hw/acpi	2020-08-21 06:30:32 -04:00
nvdimm.c
pci.c
pcihp.c	Introduce a new flag for i440fx to disable PCI hotplug on the root bus	2020-08-27 08:29:08 -04:00
piix4.c	Introduce a new flag for i440fx to disable PCI hotplug on the root bus	2020-08-27 08:29:08 -04:00
tco.c
tpm.c
trace-events
trace.h	trace: switch position of headers to what Meson requires	2020-08-21 06:18:24 -04:00
utils.c
vmgenid.c