feat: Add KVM Nested State support and upgrade to Rust edition 2024 #331
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SteelCrab
requested review from
acatangiu,
andreeaflorescu,
lauralt,
sameo,
roypat and
ShadowCurse
as code owners
This type is a helper, making the use of get_nested_state() and set_nested_state(), which are added in a following commit, much more convenient. Note that this type's name uses UpperCamelCase as it is not just a plain old data type but actually contains some logic: the `size` field is properly initialized. Effectively, KVM expects a dynamic buffer with a header reporting the size to either store the nested state in or load it from. As such data structures with a certain alignment are challenging to work with (note that Vec<u8> always have an alignment of 1 but we need 4), this type sacrifices a little memory overhead in some cases for better UX; copying 8K once is cheap anyway. Signed-off-by: Philipp Schuster <[email protected]> On-behalf-of: SAP [email protected]
More info: https://docs.kernel.org/virt/kvm/api.html#capabilities-that-can-be-enabled-on-vcpus Signed-off-by: Philipp Schuster <[email protected]> On-behalf-of: SAP [email protected]
These calls are relevant for live-migration and state save/resume when nested virtualization is used. I tested everything with a nested guest in Cloud Hypervisor, but these patches are not yet upstream. Signed-off-by: Philipp Schuster <[email protected]> On-behalf-of: SAP [email protected]
This commit upgrades kvm-bindings from the default Rust edition 2015 to edition 2024, addressing the need for explicit unsafe blocks and proper module path resolution. Changes: - Add \`edition = \"2024\"\` to kvm-bindings/Cargo.toml - Wrap unsafe function calls in explicit unsafe blocks in bindings.rs - from_raw_parts, from_raw_parts_mut, transmute calls - Fix import paths in fam_wrappers.rs and nested.rs: - \`use x86_64::bindings::*\` → \`use crate::x86_64::bindings::*\` - Add explicit \`crate::\` prefix for module imports - Remove \`extern crate core;\` (automatic in edition 2024) All tests pass with no warnings. Fixes rust-vmm#329 Signed-off-by: SteelCrab <[email protected]>
- Fix import paths: use bindings:: → use crate::bindings:: - Resolve zerocopy trait conflicts for union types - Add comprehensive serde support for KVM structures - Fix cross-platform compilation for x86_64, ARM64, RISC-V64 - Ensure MUSL compatibility Signed-off-by: SteelCrab <[email protected]>
- Add safety comments for unsafe blocks to satisfy clippy - Fix test module imports with crate:: prefix Signed-off-by: SteelCrab <[email protected]>
Signed-off-by: SteelCrab <[email protected]>
- Add safety comments for unsafe blocks to satisfy clippy Signed-off-by: SteelCrab <[email protected]>
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Hey @SteelCrab, sorrry, this isn't quite what I had in mind. The nested state stuff we'll merge through #322, so please don't include them in your PR. Instead please just start with the current |
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Hey @SteelCrab, now that #322 is merged, can you rebase this on top of main? |
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Any update here? @SteelCrab |
5 tasks
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superceded by #335 |
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Summary
This PR adds KVM Nested State functionality and upgrades the project to Rust edition 2024.
Changes
New Features
Infrastructure
Modified Components
Testing
Breaking Changes
None - all changes are additive and maintain backward compatibility.