verify add_used operation using guestmemory stubs #346
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@roypat Hi Patrick, thanks |
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priyasiddharth
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Jun 19, 2025
MatiasVara
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Add the verify_spec_2_7_7_2() proof to verify that the implementation of queue satisfies 2.7.7.2 requirement. The proof relies on whether the EVENT_IDX feature has been negotiated. Conversely with `test_needs_notification()` test, this proof `tests` for all possible values of the queue structure. Signed-off-by: Matias Ezequiel Vara Larsen <[email protected]> Signed-off-by: Siddharth Priya <[email protected]>
Add the verify_spec_2_7_7_2() proof to verify that the implementation of queue satisfies 2.7.7.2 requirement. The proof relies on whether the EVENT_IDX feature has been negotiated. Conversely with `test_needs_notification()` test, this proof `tests` for all possible values of the queue structure. Signed-off-by: Matias Ezequiel Vara Larsen <[email protected]>
GuestMemory trait brings in Bytes trait and therefore hardcodes impl for write_obj and store methods. This does not work well with Kani which now has to process these methods symbolically. The solution is to provide NOP impl for these methods. My current solution is to use kani stub macro to replace these methods by local stubs. Another solution can be to provide the proof writer a way to construct GuestMemory such that they can stub out methods as needed. Signed-off-by: Siddharth Priya <[email protected]>
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Signed-off-by: Siddharth Priya <[email protected]>
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Summary of the PR
We need to stub out or provide fake implementation for
GuestMemoryread/write operations since they are too expensive forkanito execute as-is.This problem was faces by
firekrackeralso and solved by using a fake impl (link).in
vmm-virtioGuestMemory is hardcoded to use the default impl (link) so it is not easy to fake it. There are a few options i see.Bytestrait forGuestMemoryfor kani - needs changes tovm-memorycratevm-virtiofunctions useGuestMemoryin production andFakeGuestMemoryin kani - needs changes tovm-virtioto conditionally compile and use the rightGuestMemoryThis PR provides the third option. However, 1 or 2 maybe a better engineering solution. Looking for inputs.
Requirements
Before submitting your PR, please make sure you addressed the following
requirements:
git commit -s), and the commit message has max 60 characters for thesummary and max 75 characters for each description line.
test.
Release" section of CHANGELOG.md (if no such section exists, please create one).
unsafecode is properly documented.