crosvm/kvm/tests/dirty_log.rs

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// Copyright 2017 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#![cfg(any(target_arch = "x86", target_arch = "x86_64"))]
extern crate sys_util;
extern crate kvm_sys;
extern crate kvm;
use kvm::*;
use kvm_sys::kvm_regs;
use sys_util::{GuestAddress, GuestMemory, SharedMemory, MemoryMapping};
#[test]
fn test_run() {
/*
0000 881C mov [si],bl
0002 F4 hlt
*/
let code = [0x88, 0x1c, 0xf4];
let mem_size = 0x10000;
let load_addr = GuestAddress(0x1000);
let guest_mem = GuestMemory::new(&[]).unwrap();
let mut mem = SharedMemory::new(None).expect("failed to create shared memory");
mem.set_size(mem_size)
.expect("failed to set shared memory size");
let mmap = MemoryMapping::from_fd(&mem, mem_size as usize)
.expect("failed to create memory mapping");
mmap.write_slice(&code[..], load_addr.offset() as usize)
.expect("Writing code to memory failed.");
let kvm = Kvm::new().expect("new kvm failed");
let mut vm = Vm::new(&kvm, guest_mem).expect("new vm failed");
let vcpu = Vcpu::new(0, &kvm, &vm).expect("new vcpu failed");
let mut vcpu_sregs = vcpu.get_sregs().expect("get sregs failed");
vcpu_sregs.cs.base = 0;
vcpu_sregs.cs.selector = 0;
vcpu.set_sregs(&vcpu_sregs).expect("set sregs failed");
let mut vcpu_regs: kvm_regs = unsafe { std::mem::zeroed() };
vcpu_regs.rip = load_addr.offset() as u64;
vcpu_regs.rflags = 2;
// Write 0x12 to the beginning of the 9th page.
vcpu_regs.rsi = 0x8000;
vcpu_regs.rbx = 0x12;
vcpu.set_regs(&vcpu_regs).expect("set regs failed");
let slot = vm.add_device_memory(GuestAddress(0),
MemoryMapping::from_fd(&mem, mem_size as usize)
.expect("failed to create memory mapping"),
false,
true)
.expect("failed to register memory");
loop {
match vcpu.run().expect("run failed") {
VcpuExit::Hlt => break,
r => panic!("unexpected exit reason: {:?}", r),
}
}
let mut dirty_log = [0x0, 0x0];
vm.get_dirty_log(slot, &mut dirty_log[..])
.expect("failed to get dirty log");
// Tests the 9th page was written to.
assert_eq!(dirty_log[1], 0x1);
assert_eq!(mmap.read_obj::<u64>(vcpu_regs.rsi as usize).unwrap(),
vcpu_regs.rbx);
}