Guest panic context refactor

[danbugs]

This PR removes the guest panic context memory region and refactors the functionality to use a new OutBAction that prints to stderr.

I recommend you review this commit-by-commit.

Note: Just like #462, this PR is also part of the effort of breaking #297 into more digestible bits.

[Copilot]

Pull Request Overview

This PR refactors the handling of guest panic context by removing the dedicated panic context memory region and its associated functions, and instead using a new OutBAction that prints to stderr. Key changes include:

• Removal of the Guest Panic Context region from memory management and layout.
• Updates to outb function signatures and related handler traits to use byte slices rather than integer values.
• Adjustments in hypervisor and guest modules to reflect the new OutBAction API.

Reviewed Changes

Copilot reviewed 25 out of 25 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/hyperlight_host/src/mem/mgr.rs	Removed PanicContext variant from memory region assignment.
src/hyperlight_host/src/mem/memory_region.rs	Dropped the PanicContext enum variant.
src/hyperlight_host/src/mem/layout.rs	Removed panic context offsets, functions, and validations from the layout.
src/hyperlight_host/src/hypervisor/*	Updated outb call signatures and payload handling from u64 to Vec.
src/hyperlight_guest/src/*	Adjusted panic, abort and error handling to use new OutBAction and byte slice parameters.
src/hyperlight_common/src/outb.rs	Introduced new OutBAction definitions and removed GuestPanicContextData.

Comments suppressed due to low confidence (2)

src/hyperlight_host/src/mem/layout.rs:268

• The removal of guest panic context offsets is clear; ensure that all related documentation and tests are updated to reflect the new memory layout without the Guest Panic Context.

            peb_guest_panic_context_offset,

src/hyperlight_common/src/mem.rs:76

• The removal of GuestPanicContextData is appropriate; please verify there are no residual dependencies on this structure in other modules.

pub struct GuestPanicContextData {

[marosset]

LGTM