Compatibility issues between KVM-NYX, Kernel 5.10.75, and QEMU-NYX

[Fewword]

I encountered compatibility issues when trying to use KVM-NYX with specific kernel and QEMU versions. Below are the details:

1. Environment:

Kernel version: 5.10.75 (NYX-specific)
QEMU versions:
Latest QEMU-NYX: Encountering KVM_CAP_DIRTY_LOG_RING not supported.
Older QEMU-NYX: Missing fast-vm-load support.

2. Observed Issues:

If I use the latest QEMU-NYX, the kernel modules kvm and kvm-intel (built for kernel 5.10.75) do not support the KVM_CAP_DIRTY_LOG_RING feature, resulting in errors during execution.
If I use an older version of QEMU-NYX to avoid the above issue, it lacks support for the critical fast_vm_reload feature, which is required for my use case.

3. Steps to Reproduce:

Build and load kvm and kvm-intel modules from the kernel 5.10.75 source.
Install the latest QEMU-NYX and attempt to run a virtual machine.
Observe the error related to KVM_DIRTY_LOG_RING.
Downgrade to an older QEMU-NYX version and retry.
Observe that fast-vm-load functionality is missing.

4. Expected Behavior:

A compatible combination of kernel modules and QEMU-NYX should support both KVM_DIRTY_LOG_RING and fast-vm-load.

5.Actual Behavior:

Unable to use both features simultaneously with any available combination of kernel and QEMU versions.

[schumilo]

Could you please give the following build of KVM-Nyx a try and report back if this solves the issue?
https://github.com/IntelLabs/kafl.linux/releases/tag/kvm-nyx-6.8

Thanks!

[Fewword]

Hi @schumilo,

Thank you for your response! I attempted to download the KVM-Nyx-6.8 release package from the link you provided, but it seems the download page returns a 404: Not Found error.

To proceed, I downloaded the KVM-Nyx-6.0 release package and tried to build the kvm.ko and kvm-intel.ko files using the compile_kvm_nyx_standalone.sh script. However, the process is stuck at the make oldconfig step, even after running overnight.

Could you please provide precompiled versions of the kvm.ko and kvm-intel.ko files, especially for the 6.8 release? This would greatly help in resolving the compatibility issues I am facing.

Thank you for your assistance!