alioth 0.12.0

Core library for Alioth, an experimental Type-2 hypervisor.
Documentation 
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// Copyright 2024 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use std::ffi::CString;
use std::fs::File;
use std::os::fd::{AsRawFd, FromRawFd};
use std::path::Path;
use std::sync::Arc;

use snafu::ResultExt;

use crate::sys::vfio::{
    VfioIommu, vfio_group_get_device_fd, vfio_group_set_container, vfio_group_unset_container,
};
use crate::vfio::container::Container;
use crate::vfio::device::Device;
use crate::vfio::{Result, error};

#[derive(Debug)]
pub struct Group {
    container: Option<Arc<Container>>,
    fd: File,
}

impl Group {
    pub fn new(path: &Path) -> Result<Self> {
        let fd = File::open(path).context(error::AccessDevice { path })?;
        Ok(Group {
            fd,
            container: None,
        })
    }

    pub fn attach(&mut self, container: Arc<Container>, iommu: VfioIommu) -> Result<()> {
        unsafe { vfio_group_set_container(&self.fd, &container.fd().as_raw_fd()) }?;
        container.set_iommu(iommu)?;
        self.container.replace(container);
        Ok(())
    }

    pub fn detach(&mut self) -> Result<()> {
        if self.container.is_none() {
            return Ok(());
        }
        unsafe { vfio_group_unset_container(&self.fd) }?;
        self.container = None;
        Ok(())
    }
}

impl Drop for Group {
    fn drop(&mut self) {
        if let Err(e) = self.detach() {
            log::error!(
                "Group-{}: detaching from container: {e:?}",
                self.fd.as_raw_fd()
            );
        }
    }
}

#[derive(Debug)]
pub struct DevFd {
    fd: File,
    _group: Arc<Group>,
}

impl DevFd {
    pub fn new(group: Arc<Group>, id: &str) -> Result<Self> {
        let id_c = CString::new(id).unwrap();
        let fd = unsafe { vfio_group_get_device_fd(&group.fd, id_c.as_ptr()) }?;
        Ok(DevFd {
            fd: unsafe { File::from_raw_fd(fd) },
            _group: group,
        })
    }
}

impl Device for DevFd {
    fn fd(&self) -> &File {
        &self.fd
    }
}