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https://how-to.fandom.com/wiki/How_to_configure_the_Linux_kernel/drivers/pci/hotplug
Say Y here if you have a motherboard with a PCI Hotplug controller. This allows you to add and remove PCI cards while the machine is powered up and running. The file system pcihpfs must be mounted in order to interact with any PCI Hotplug controllers. To compile this driver as a module, choose M here: the module will be called pci_hotplug.
https://electronics.stackexchange.com/questions/279892/why-does-pcie-hotplug-capability-require-hardware-support
Why does PCIe hotplug capability require hardware support? Ask Question ... The hotplug spec for whichever PCI spec you are working on will specify this stuff as well as the requirements of the other side of the interface. \$\endgroup\$ – Dan Mills Jan 12 '17 at 16:54. ... Hardware support not only means that (that functionality is pretty ...
https://github.com/intel/nemu/wiki/ACPI-PCI-discovery-hotplug
Feb 06, 2019 · ACPI Based PCI Hotplug The virt platform chose to use ACPI based hotplug to free the user from being forced to create PCIe hierarchies just to support hotplug. It also eliminates the need to model a PCIe controllers that supports hotplug. The virt platform uses APCI based hotplug for …
https://www.kernel.org/doc/html/latest/core-api/cpu_hotplug.html
Hence the need for CPU hotplug support in the Linux kernel. A more novel use of CPU-hotplug support is its use today in suspend resume support for SMP. Dual-core and HT support makes even a laptop run SMP kernels which didn’t support these methods. Command Line Switches ¶
http://lkml.iu.edu/hypermail/linux/kernel/1407.1/05375.html
> > This patch set enhances IOAPIC core and ACPI drivers to support IOAPIC > > hotplug on x86 platforms. It's based on tip/x86/apic. > > > > You may pull it from ... initcall pci_hotplug_init+0x0/0x1e returned 0 after 5731 usecs [ 9.483468] calling pcied_init+0x0/0x76 @ 1 ... initcall io_apic_bug_finalize+0x0/0x1a returned 0 after 4 usecs
https://patchwork.kernel.org/patch/1957681/
Jan 09, 2013 · Native PCIe hotplug (pciehp) is the default when it is supported, and as far as I can tell, it *is* supported on this system. If we had some indication that it's not supported, e.g., if the BIOS declined to grant us control over PCIe native hotplug, then of course we would fall back to using acpiphp.
https://github.com/CospanDesign/nvidia-tx1-kernel/commit/1bb8a8c7f88363ddc3cbea2e4b1be7aac3160a69
Finally eradicate CONFIG_HOTPLUG Ever since commit 45f035a ("CONFIG_HOTPLUG should be always on"), it has been basically impossible to build a kernel with CONFIG_HOTPLUG turned off. Remove all the remaining references to it. ... tristate "PCI IO-APIC hotplug support" if X86: depends on PCI: depends on ACPI: depends on HOTPLUG: default !X86 ...
https://events.static.linuxfound.org/slides/2010/linuxcon_japan/linuxcon_jp2010_yamahata.pdf
Goal in PCI area Enable 3+ pci buses(96+ slots)/96+ pcie slots The current PC emulation supports only host bus. – Flat PCI topology: up to only 32 devices PCI hotplug requires ACPI dance. – The used DSDT supports only pci bus 0. – This is difficult to resolve with acpi Enable unsupported features 64bit BAR Multifunction bit Bridge filtering
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