Feat/vfio user

alioth-cli/src/boot/boot.rs

@@ -31,7 +31,7 @@ use alioth::hv::{CocoSpec, HvSpec, Hypervisor};
 use alioth::loader::{Executable, PayloadSpec};
 use alioth::mem::{MemBackend, MemSpec};
 #[cfg(target_os = "linux")]
-use alioth::vfio::{VfioCdevSpec, VfioContainerSpec, VfioGroupSpec, VfioIoasSpec};
+use alioth::vfio::{VfioCdevSpec, VfioContainerSpec, VfioGroupSpec, VfioIoasSpec, VfioUserSpec};
 #[cfg(target_os = "linux")]
 use alioth::virtio::DeviceId;
 use alioth::virtio::dev::balloon::BalloonSpec;
@@ -182,6 +182,10 @@ pub struct BootArgs {
     #[arg(long, help(help_text::<VfioContainerSpec>("Add a new VFIO container.")))]
     vfio_container: Vec<String>,
 
+    #[cfg(target_os = "linux")]
+    #[arg(long, help(help_text::<VfioUserSpec>("Assign a vfio-user device to the guest.")))]
+    vfio_user: Vec<String>,
+
     #[arg(long)]
     #[arg(long, help(help_text::<BalloonSpec>("Add a VirtIO balloon device.")))]
     balloon: Option<String>,
@@ -358,6 +362,11 @@ fn parse_args(mut args: BootArgs, objects: HashMap<&str, &str>) -> Result<VmSpec
         let param = serde_aco::from_args(&arg, &objects).context(error::ParseArg { arg })?;
         spec.vfio_group.push(param);
     }
+    #[cfg(target_os = "linux")]
+    for arg in args.vfio_user {
+        let param = serde_aco::from_args(&arg, &objects).context(error::ParseArg { arg })?;
+        spec.vfio_user.push(param);
+    }
 
     Ok(spec)
 }
@@ -460,6 +469,10 @@ fn create<H: Hypervisor>(hypervisor: &H, spec: VmSpec) -> Result<Machine<H>, ali
     for (index, cdev_spec) in spec.vfio_cdev.into_iter().enumerate() {
         vm.add_vfio_cdev(format!("vfio-{index}").into(), cdev_spec)?;
     }
+    #[cfg(target_os = "linux")]
+    for (index, user_spec) in spec.vfio_user.into_iter().enumerate() {
+        vm.add_vfio_user_dev(format!("vfio-user-{index}").into(), user_spec)?;
+    }
 
     #[cfg(target_os = "linux")]
     for container_spec in spec.vfio_container.into_iter() {

alioth-cli/src/boot/boot_test.rs

@@ -212,6 +212,8 @@ fn test_parse_args() {
             container: Some("gpu_container".into()),
             devices: vec!["0000:06:0d.0".into(), "0000:06:0d.1".into()],
         }],
+        #[cfg(target_os = "linux")]
+        vfio_user: vec![],
     };
     assert_eq!(spec, want);
 }

alioth-cli/src/boot/config.rs

@@ -21,7 +21,7 @@ use alioth::device::console::ConsoleSpec;
 use alioth::device::fw_cfg::FwCfgItemSpec;
 use alioth::loader::PayloadSpec;
 #[cfg(target_os = "linux")]
-use alioth::vfio::{VfioCdevSpec, VfioContainerSpec, VfioGroupSpec, VfioIoasSpec};
+use alioth::vfio::{VfioCdevSpec, VfioContainerSpec, VfioGroupSpec, VfioIoasSpec, VfioUserSpec};
 use alioth::virtio::dev::balloon::BalloonSpec;
 use alioth::virtio::dev::blk::BlkFileSpec;
 use alioth::virtio::dev::entropy::EntropySpec;
@@ -119,4 +119,6 @@ pub struct VmSpec {
     pub vfio_group: Vec<VfioGroupSpec>,
     #[cfg(target_os = "linux")]
     pub vfio_container: Vec<VfioContainerSpec>,
+    #[cfg(target_os = "linux")]
+    pub vfio_user: Vec<VfioUserSpec>,
 }

alioth/src/sys/linux/vfio.rs

@@ -13,6 +13,7 @@
 // limitations under the License.
 
 use bitfield::bitfield;
+use zerocopy::{FromBytes, Immutable, IntoBytes, KnownLayout};
 
 use crate::sys::ioctl::ioctl_io;
 use crate::{
@@ -80,7 +81,7 @@ consts! {
 }
 
 #[repr(C)]
-#[derive(Debug, Clone, Default)]
+#[derive(Debug, Clone, Default, KnownLayout, Immutable, FromBytes, IntoBytes)]
 pub struct VfioRegionInfo {
     pub argsz: u32,
     pub flags: VfioRegionInfoFlag,
@@ -116,7 +117,7 @@ consts! {
 }
 
 #[repr(C)]
-#[derive(Debug, Clone, Default)]
+#[derive(Debug, Clone, Default, KnownLayout, Immutable, FromBytes, IntoBytes)]
 pub struct VfioIrqInfo {
     pub argsz: u32,
     pub flags: VfioIrqInfoFlag,

alioth/src/vfio/cdev.rs

@@ -13,25 +13,26 @@
 // limitations under the License.
 
 use std::fmt::Debug;
-use std::fs::{File, OpenOptions};
+use std::fs::OpenOptions;
 use std::mem::size_of;
-use std::os::fd::AsRawFd;
+use std::os::fd::{AsRawFd, BorrowedFd, OwnedFd};
 use std::path::Path;
 use std::sync::Arc;
 
 use snafu::ResultExt;
 
 use crate::sys::vfio::{
-    VfioDeviceAttachIommufdPt, VfioDeviceBindIommufd, VfioDeviceDetachIommufdPt,
-    vfio_device_attach_iommufd_pt, vfio_device_bind_iommufd, vfio_device_detach_iommufd_pt,
+    VfioDeviceAttachIommufdPt, VfioDeviceBindIommufd, VfioDeviceDetachIommufdPt, VfioDeviceInfo,
+    VfioIrqInfo, VfioRegionInfo, vfio_device_attach_iommufd_pt, vfio_device_bind_iommufd,
+    vfio_device_detach_iommufd_pt,
 };
-use crate::vfio::device::Device;
+use crate::vfio::device::{Device, VfioIoDevice};
 use crate::vfio::iommu::Ioas;
 use crate::vfio::{Result, error};
 
 #[derive(Debug)]
 pub struct Cdev {
-    fd: File,
+    io_dev: VfioIoDevice,
     ioas: Option<Arc<Ioas>>,
 }
 
@@ -44,7 +45,8 @@ impl Cdev {
             .context(error::AccessDevice {
                 path: path.as_ref(),
             })?;
-        Ok(Cdev { fd, ioas: None })
+        let io_dev = VfioIoDevice::new(fd)?;
+        Ok(Cdev { io_dev, ioas: None })
     }
 }
 
@@ -55,41 +57,85 @@ impl Cdev {
             iommufd: ioas.iommu.fd.as_raw_fd(),
             ..Default::default()
         };
-        unsafe { vfio_device_bind_iommufd(&self.fd, &bind) }?;
+        unsafe { vfio_device_bind_iommufd(self.io_dev.fd(), &bind) }?;
         let attach = VfioDeviceAttachIommufdPt {
             argsz: size_of::<VfioDeviceAttachIommufdPt>() as u32,
             pt_id: ioas.id,
             ..Default::default()
         };
-        unsafe { vfio_device_attach_iommufd_pt(&self.fd, &attach) }?;
+        unsafe { vfio_device_attach_iommufd_pt(self.io_dev.fd(), &attach) }?;
         self.ioas.replace(ioas);
         Ok(())
     }
 
     pub fn detach_iommu_ioas(&mut self) -> Result<()> {
         if self.ioas.is_none() {
             return Ok(());
-        };
+        }
         let detach = VfioDeviceDetachIommufdPt {
             argsz: size_of::<VfioDeviceDetachIommufdPt>() as u32,
             flags: 0,
         };
-        unsafe { vfio_device_detach_iommufd_pt(&self.fd, &detach) }?;
+        unsafe { vfio_device_detach_iommufd_pt(self.io_dev.fd(), &detach) }?;
         self.ioas = None;
         Ok(())
     }
 }
 
 impl Device for Cdev {
-    fn fd(&self) -> &File {
-        &self.fd
+    fn get_info(&self) -> Result<VfioDeviceInfo> {
+        self.io_dev.get_info()
+    }
+
+    fn get_region_info(&self, index: u32) -> Result<VfioRegionInfo> {
+        self.io_dev.get_region_info(index)
+    }
+
+    fn get_irq_info(&self, index: u32) -> Result<VfioIrqInfo> {
+        self.io_dev.get_irq_info(index)
+    }
+
+    fn reset(&self) -> Result<()> {
+        self.io_dev.reset()
+    }
+
+    fn set_irq_eventfd(
+        &self,
+        index: u32,
+        start: u32,
+        eventfds: &[Option<BorrowedFd<'_>>],
+    ) -> Result<()> {
+        self.io_dev.set_irq_eventfd(index, start, eventfds)
+    }
+
+    fn disable_irq(&self, index: u32) -> Result<()> {
+        self.io_dev.disable_irq(index)
+    }
+
+    fn read_region(&self, region: &VfioRegionInfo, offset: u64, buf: &mut [u8]) -> Result<()> {
+        self.io_dev.read_region(region, offset, buf)
+    }
+
+    fn write_region(&self, region: &VfioRegionInfo, offset: u64, buf: &[u8]) -> Result<()> {
+        self.io_dev.write_region(region, offset, buf)
+    }
+
+    fn get_region_mmap(&self, index: u32) -> Result<Option<(OwnedFd, u64)>> {
+        self.io_dev.get_region_mmap(index)
+    }
+
+    fn get_dma_buf_fd(&self, index: u32, offset: u64, size: usize) -> Result<OwnedFd> {
+        self.io_dev.get_dma_buf_fd(index, offset, size)
     }
 }
 
 impl Drop for Cdev {
     fn drop(&mut self) {
         if let Err(e) = self.detach_iommu_ioas() {
-            log::error!("Cdev-{}: detaching ioas: {e:?}", self.fd.as_raw_fd())
+            log::error!(
+                "Cdev-{}: detaching ioas: {e:?}",
+                self.io_dev.fd().as_raw_fd()
+            )
         }
     }
 }

alioth/src/vfio/container.rs

@@ -32,7 +32,7 @@ use crate::vfio::{Result, error};
 #[derive(Debug)]
 pub struct Container {
     fd: File,
-    iommu: Mutex<Option<VfioIommu>>,
+    pub(super) iommu: Mutex<Option<VfioIommu>>,
 }
 
 impl Container {