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Gdb debug improvements #456

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@dblnz dblnz commented May 2, 2025 •
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Purpose

I opened up this PR to address some leftover comments from a previous PR.
This closes #380 .

Description

These changes do the following

  • move the x86 vCPU specific constants to gdb/arch.rs to avoid duplicating them
  • add a function that determines the vCPU stop reason based on a series of parameters (DR6 register, exception vector)
  • modify kvm get_stop_reason method to use the hypervisor independent function described above
  • retrieve additional information from the mshv hv_message returned after a run call.
    This information serves the get_stop_reason with information on the exception that was triggered.
  • modify the mshv debugging code to use the hypervisor independent function which determines the stop reason of an x86 vCPU.

Note: I tested the scenario specified in this comment and it does present any issue

dblnz added 3 commits May 2, 2025 11:28
@dblnz
gdb: move arch specific values to a different file
6b1454c 
- this helps contain the x86 specific registers, masks isolated from
the higher level logic

Signed-off-by: Doru Blânzeanu <[email protected]>
@dblnz
gdb: move vcpu arch specific stop reason to different file
edd59e9 
- update kvm_debug to use this hypervisor independent function

Signed-off-by: Doru Blânzeanu <[email protected]>
@dblnz
gdb: update mshv hypervisor to use the arch specific logic to determi…
82c95f2 
…ne stop reason

Signed-off-by: Doru Blânzeanu <[email protected]>
@dblnz dblnz added the kind/refactor For PRs that restructure or remove code without adding new functionality. label May 2, 2025
@dblnz dblnz self-assigned this May 2, 2025
@dblnz dblnz changed the title Gdb debug improvements #380 Gdb debug improvements May 2, 2025
@dblnz dblnz changed the title #380 Gdb debug improvements Gdb debug improvements May 2, 2025
@dblnz dblnz marked this pull request as ready for review May 2, 2025 10:42
@dblnz dblnz requested a review from syntactically May 2, 2025 10:42
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Improve the way vCPU stop reason is implemented to reduce code duplication
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