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75 lines
2.3 KiB
75 lines
2.3 KiB
4 months ago
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// Copyright 2017 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#![cfg(any(target_arch = "x86", target_arch = "x86_64"))]
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use kvm::*;
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use kvm_sys::kvm_regs;
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use vm_memory::{GuestAddress, GuestMemory};
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#[test]
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fn test_run() {
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// This example based on https://lwn.net/Articles/658511/
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let code = [
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0xba, 0xf8, 0x03, /* mov $0x3f8, %dx */
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0x00, 0xd8, /* add %bl, %al */
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0x04, '0' as u8, /* add $'0', %al */
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0xee, /* out %al, (%dx) */
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0xb0, '\n' as u8, /* mov $'\n', %al */
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0xee, /* out %al, (%dx) */
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0x2e, 0xc6, 0x06, 0xf1, 0x10, 0x13, /* movb $0x13, %cs:0xf1 */
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0xf4, /* hlt */
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];
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let mem_size = 0x1000;
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let load_addr = GuestAddress(0x1000);
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let mem = GuestMemory::new(&vec![(load_addr, mem_size)]).unwrap();
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let kvm = Kvm::new().expect("new kvm failed");
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let vm = Vm::new(&kvm, mem).expect("new vm failed");
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let vcpu = Vcpu::new(0, &kvm, &vm).expect("new vcpu failed");
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vm.get_memory()
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.write_at_addr(&code, load_addr)
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.expect("Writing code to memory failed.");
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let mut vcpu_sregs = vcpu.get_sregs().expect("get sregs failed");
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assert_ne!(vcpu_sregs.cs.base, 0);
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assert_ne!(vcpu_sregs.cs.selector, 0);
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vcpu_sregs.cs.base = 0;
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vcpu_sregs.cs.selector = 0;
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vcpu.set_sregs(&vcpu_sregs).expect("set sregs failed");
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let mut vcpu_regs: kvm_regs = unsafe { std::mem::zeroed() };
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vcpu_regs.rip = 0x1000;
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vcpu_regs.rax = 2;
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vcpu_regs.rbx = 7;
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vcpu_regs.rflags = 2;
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vcpu.set_regs(&vcpu_regs).expect("set regs failed");
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let mut out = String::new();
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let runnable_vcpu = vcpu.to_runnable(None).unwrap();
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loop {
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match runnable_vcpu.run().expect("run failed") {
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VcpuExit::IoOut {
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port: 0x3f8,
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size,
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data,
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} => {
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assert_eq!(size, 1);
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out.push(data[0] as char);
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}
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VcpuExit::Hlt => break,
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r => panic!("unexpected exit reason: {:?}", r),
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}
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}
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assert_eq!(out, "9\n");
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let result: u8 = vm
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.get_memory()
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.read_obj_from_addr(load_addr.checked_add(0xf1).unwrap())
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.expect("Error reading the result.");
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assert_eq!(result, 0x13);
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}
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