Babis Chalios

Use `writev` for writing guest outgoing packets to the tap device

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# Avoid extra memory copy when writing to tap device in virtio-net TX path Currently, when performing TX, a network frame might be exist in various scattered in various memory...

## Reason Right now we have one pair of (IdAllocator, AddressAllocator) per device manager (mmio and legacy for x86, mmio for aarch64) and we separate the resources (GSIs and guest...

## Changes TODO: fill up. Use this PR to test CI/CD atm ## Reason TODO: fill up ## License Acceptance By submitting this pull request, I confirm that my contribution...

Add ACPI support for x86_64

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## Changes This is a WIP rough draft of ACPI support for x86. Opening this PR for testing the PR itself but also the CI artifacts. ## Reason TBD ##...

Firecracker networking improvements

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This is a tracker for investigating improvements in the Firecracker networking stack. We are mainly looking to improve performance (throughput, latency and CPU utilization) of the emulation logic. However, we...

Add ACPI support for x86_64

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## Changes Introduce ACPI support for x86_64. ## Reason Introducing ACPI will let us do a couple of things: * Get rid of the i8042 (minimal) emulation. We will be...

Use `u32` to describe descriptor chain lengths

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### Description Currently, parts of our virtio code use usize to describe the lengths of descriptor chains [[1](https://github.com/firecracker-microvm/firecracker/blob/036d9906a09ed759597ee88bab6c1278e4fd7655/src/vmm/src/devices/virtio/iovec.rs#L43)], while other parts use u32, which results in some ugly casts that...

Avoid IoVecBuffer allocations in the TX network data path

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### Description When the guest wants to transmit an ethernet frame over a virtio-net device it places the frame somewhere in guest memory and sends us an interrupt. A single...

Refactor `vmm` builder code to simplify logic that creates the microVM to boot

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Updated on 05/09/2025: Currently, the logic to create a Vm and a Vmm objects is scattered across vmm/lib.rs and vmm.builder.rs files and it is quite convoluted and some times difficult...

Use 6.1 guest kernel configs from AL

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## Changes Use AmazonLinux tailored guest configs for our 6.1 guest microVM kernels. Also, split the Kconfig for our CI kernels in a base part which will always be reflecting...