Struct PciHotplug 

pub struct PciHotplug {
    pub present: bool,
    pub evidence: String,
}

Does the RUNNING kernel have PCI hot-plug? Measured, never declared.

Why it matters: UpCloud resizes only DETACHED volumes, so a runtime growth is detach → resize → re-attach, and a kernel with # CONFIG_HOTPLUG_PCI is not set never sees the member leave or come back (511 HOTPLUG_FAILED).

The rule, in order — both work on a no-OS PID 1 with no shell and a kernel built with CONFIG_MODULES=n:

1. /proc/config.gz (only when the kernel has CONFIG_IKCONFIG_PROC; tunnr-kernel’s nuked preset does NOT): CONFIG_HOTPLUG_PCI=y AND at least one controller (_ACPI, _PCIE, _SHPC) =y.
2. Otherwise the built-in controllers’ parameter directories: /sys/module/acpiphp (acpiphp.disable), /sys/module/pciehp (pciehp.pciehp_poll_mode), /sys/module/shpchp (shpchp.shpchp_debug). param_sysfs_builtin creates these for built-in code with parameters whether or not modules exist; nothing else in the tree creates them.

NOT used: /sys/bus/pci/slots — drivers/pci/slot.o builds on SYSFS alone, so the directory exists on a kernel with no hot-plug at all.

Fields

present: bool

evidence: String

What was read, for the reason line: config.gz: … or sys/module: ….

Trait Implementations

impl Clone for PciHotplug

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PciHotplug

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for PciHotplug

impl PartialEq for PciHotplug

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for PciHotplug