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I'm still not 100% sure what exactly this is, even after reading the description thrice. Is it basically a RISC-V core in a system with standard x86 PC peripherals, i.e. a very odd but theoretically possible configuration to emulate, in the same way that QEMU (of the same author) lets you attach e.g. a classic VGA controller to an ARM core?

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My reading is that it emulates either x86 or RISC-V CPU and can emulate various real x86 peripherals but it also includes the abstract VirtIO services for ... both?

I assume the RISC-V emulation is all VirtIO based and not real...

I think it’s both a a RISCV emulator and an x86 emulator. I think it’s both, presumably reusing some pieces allowing systems to be emulated like you say with weird configurations.

The riscv system is emulated in software whereas the x86 system is virtualized using kvm.

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