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Since the top-level Cargo.toml specifies a vmm-sys-util revision but not the sub crates, Cargo.lock points at 2 different crates. cargo vendor copies both of them into the vendor directory but forces the build to use the one coming from the top level driven requirement. Although this is a waste of space, this is a cargo vendor limitation that we have to live with for now. Also, because the dependency onto linux-loader had to be updated, we had to specify a newly introduced feature called "elf". Signed-off-by: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
vm-memory
A library to access virtual machine's physical memory.
For a typical hypervisor, there are seveval components, such as boot loader, virtual device drivers, virtio backend drivers and vhost drivers etc, need to access VM's physical memory. The vm-memory crate provides a set of traits to decouple VM memory consumers from VM memory providers. Based on these traits, VM memory consumers could access VM's physical memory without knowing the implementation details of the VM memory provider. Thus hypervisor components based on these traits could be shared and reused by multiple hypervisors.
Platform Support
- Arch: x86, AMD64, ARM64
- OS: Linux/Unix/Windows
Usage
First, add the following to your Cargo.toml:
vm-memory = "0.1"
Next, add this to your crate root:
extern crate vm_memory;
Example
- Create VM physical memory objects in hypervisor specific ways. Use the default GuestMemoryMmap as an example:
fn provide_mem_to_virt_dev() {
let gm = GuestMemoryMmap::new(&[(GuestAddress(0), 0x1000), (GuestAddress(0x1000), 0x1000)]).unwrap();
virt_device_io(&gm);
}
- Consumers access VM's physical memory
fn virt_device_io<T: GuestMemory>(mem: &T) {
let sample_buf = &[1, 2, 3, 4, 5];
assert_eq!(mem.write(sample_buf, GuestAddress(0xffc)).unwrap(), 5);
let buf = &mut [0u8; 5];
assert_eq!(mem.read(buf, GuestAddress(0xffc)).unwrap(), 5);
assert_eq!(buf, sample_buf);
}
Documentations & References
License
This project is licensed under
- Apache License, Version 2.0, (LICENSE or http://www.apache.org/licenses/LICENSE-2.0)