Kprobes

[zestrada]

This adds the kernel side of portal support for kprobes

[Copilot]

Pull request overview

This pull request adds kernel-side support for kprobes (kernel probes) to the portal infrastructure, enabling dynamic instrumentation of kernel functions similar to the existing uprobe support.

• Adds registration and unregistration operations for kprobes in the portal operation list
• Implements kprobe/kretprobe handlers with PID and process name filtering capabilities
• Introduces hypercall constants for kprobe enter/return events and debug macro support

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 9 comments.

File	Description
src/portal/portal_op_list.h	Adds REGISTER_KPROBE and UNREGISTER_KPROBE operations to the portal operation enumeration
src/portal/portal_kprobe.c	New file implementing complete kprobe lifecycle management including registration, filtering, handlers, and hash table tracking
src/igloo_hypercall_consts.h	Defines IGLOO_HYP_KPROBE_ENTER and IGLOO_HYP_KPROBE_RETURN hypercall constants
src/igloo_debug.h	Adds kprobe debug flag and igloo_debug_kprobe macro for conditional debug logging

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