cloud-hypervisor/vmm/src/lib.rs

// Copyright © 2019 Intel Corporation
//
// SPDX-License-Identifier: Apache-2.0
//

extern crate kvm_ioctls;
extern crate vm_memory;

use kvm_bindings::kvm_userspace_memory_region;
use kvm_ioctls::*;
use std::str;
use vm_memory::{Address, Bytes, GuestAddress, GuestMemory, GuestMemoryMmap, GuestMemoryRegion};

pub fn test_vm() {
    // This example based on https://lwn.net/Articles/658511/
    let code = [
        0xba, 0xf8, 0x03, /* mov $0x3f8, %dx */
        0x00, 0xd8, /* add %bl, %al */
        0x04, '0' as u8, /* add $'0', %al */
        0xee,      /* out %al, (%dx) */
        0xb0, '\n' as u8, /* mov $'\n', %al */
        0xee,       /* out %al, (%dx) */
        0xf4,       /* hlt */
    ];

    let mem_size = 0x1000;
    let load_addr = GuestAddress(0x1000);
    let mem = GuestMemoryMmap::new(&vec![(load_addr, mem_size)]).unwrap();

    let kvm = Kvm::new().expect("new KVM instance creation failed");
    let vm_fd = kvm.create_vm().expect("new VM fd creation failed");

    mem.with_regions(|index, region| {
        let mem_region = kvm_userspace_memory_region {
            slot: index as u32,
            guest_phys_addr: region.start_addr().raw_value(),
            memory_size: region.len() as u64,
            userspace_addr: region.as_ptr() as u64,
            flags: 0,
        };

        // Safe because the guest regions are guaranteed not to overlap.
        vm_fd.set_user_memory_region(mem_region)
    })
    .expect("Cannot configure guest memory");

    mem.write_slice(&code, load_addr)
        .expect("Writing code to memory failed");

    let vcpu_fd = vm_fd.create_vcpu(0).expect("new VcpuFd failed");

    let mut vcpu_sregs = vcpu_fd.get_sregs().expect("get sregs failed");
    vcpu_sregs.cs.base = 0;
    vcpu_sregs.cs.selector = 0;
    vcpu_fd.set_sregs(&vcpu_sregs).expect("set sregs failed");

    let mut vcpu_regs = vcpu_fd.get_regs().expect("get regs failed");
    vcpu_regs.rip = 0x1000;
    vcpu_regs.rax = 2;
    vcpu_regs.rbx = 3;
    vcpu_regs.rflags = 2;
    vcpu_fd.set_regs(&vcpu_regs).expect("set regs failed");

    loop {
        match vcpu_fd.run().expect("run failed") {
            VcpuExit::IoIn(addr, data) => {
                println!(
                    "IO in -- addr: {:#x} data [{:?}]",
                    addr,
                    str::from_utf8(&data).unwrap()
                );
            }
            VcpuExit::IoOut(addr, data) => {
                println!(
                    "IO out -- addr: {:#x} data [{:?}]",
                    addr,
                    str::from_utf8(&data).unwrap()
                );
            }
            VcpuExit::MmioRead(_addr, _data) => {}
            VcpuExit::MmioWrite(_addr, _data) => {}
            VcpuExit::Unknown => {}
            VcpuExit::Exception => {}
            VcpuExit::Hypercall => {}
            VcpuExit::Debug => {}
            VcpuExit::Hlt => {
                println!("HLT");
            }
            VcpuExit::IrqWindowOpen => {}
            VcpuExit::Shutdown => {}
            VcpuExit::FailEntry => {}
            VcpuExit::Intr => {}
            VcpuExit::SetTpr => {}
            VcpuExit::TprAccess => {}
            VcpuExit::S390Sieic => {}
            VcpuExit::S390Reset => {}
            VcpuExit::Dcr => {}
            VcpuExit::Nmi => {}
            VcpuExit::InternalError => {}
            VcpuExit::Osi => {}
            VcpuExit::PaprHcall => {}
            VcpuExit::S390Ucontrol => {}
            VcpuExit::Watchdog => {}
            VcpuExit::S390Tsch => {}
            VcpuExit::Epr => {}
            VcpuExit::SystemEvent => {}
            VcpuExit::S390Stsi => {}
            VcpuExit::IoapicEoi => {}
            VcpuExit::Hyperv => {}
        }
        //        r => panic!("unexpected exit reason: {:?}", r),
    }
}