zig-kvm-playground.zig

const linux = @cImport({
    @cInclude("linux/kvm.h");
});
const sys = @cImport({
    @cInclude("sys/ioctl.h");
    @cInclude("sys/stat.h");
    @cInclude("fcntl.h");
});
const std = @import("std");
const assert = std.debug.assert;

pub fn main() !void {
    const stdout = std.io.getStdOut().outStream();
    try stdout.print("Hello\n", .{});

    const kvm = sys.open("/dev/kvm", sys.O_RDWR | sys.O_CLOEXEC);
    assert(kvm != @as(c_int, -1));
    try stdout.print("KVM OK!\n", .{});

    const kvmVersion = sys.ioctl(kvm, linux.KVM_GET_API_VERSION, @as(c_int, 0));
    assert(kvmVersion == linux.KVM_API_VERSION);
    try stdout.print("KVM VER OK!\n", .{});

    const kvmMaxVCPU = sys.ioctl(kvm, linux.KVM_CHECK_EXTENSION, @as(c_ulong, linux.KVM_CAP_NR_VCPUS));
    try stdout.print("Max CPUs: {}\n", .{kvmMaxVCPU});

    const vmType: c_int = 0;
    const vm = sys.ioctl(kvm, linux.KVM_CREATE_VM, vmType);
    assert(vm > 0);
    try stdout.print("VM CREATED!\n", .{});

    const kvmFirstVCPU = sys.ioctl(vm, linux.KVM_CREATE_VCPU, @as(c_ulong, 0));
    assert(kvmFirstVCPU != @as(c_int, -1));
    try stdout.print("VCPU CREATED!\n", .{});

    try stdout.print("Bye\n", .{});
}