mirror of
https://chromium.googlesource.com/crosvm/crosvm
synced 2024-12-27 13:58:27 +00:00
e0e8e56732
Read only memory is useful for triggering VM exits when the VM writes to memory while allowing reads transparently and quickly. For example, a virtual device implementation might not care if the VM reads a memory mapped device register, but a exit would be required if the VM wrote to the same register. TEST=cargo test -p kvm; ./build_test BUG=chromium:800626 Change-Id: Ic605b2cfc2a1e44941d91945f9390b9abb820040 Reviewed-on: https://chromium-review.googlesource.com/903075 Commit-Ready: Zach Reizner <zachr@chromium.org> Tested-by: Zach Reizner <zachr@chromium.org> Reviewed-by: Zach Reizner <zachr@chromium.org>
71 lines
2.4 KiB
Rust
71 lines
2.4 KiB
Rust
// 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);
|
|
}
|