cloud-hypervisor/virtio-devices/src/iommu.rs

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// Copyright © 2019 Intel Corporation
//
// SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
use super::Error as DeviceError;
use super::{
ActivateResult, DescriptorChain, EpollHelper, EpollHelperError, EpollHelperHandler, Queue,
VirtioCommon, VirtioDevice, VirtioDeviceType, EPOLL_HELPER_EVENT_LAST, VIRTIO_F_VERSION_1,
};
use crate::seccomp_filters::Thread;
use crate::thread_helper::spawn_virtio_thread;
use crate::GuestMemoryMmap;
use crate::{DmaRemapping, VirtioInterrupt, VirtioInterruptType};
use seccompiler::SeccompAction;
use std::collections::BTreeMap;
use std::fmt::{self, Display};
use std::io;
use std::mem::size_of;
use std::ops::Bound::Included;
use std::os::unix::io::AsRawFd;
use std::result;
use std::sync::atomic::AtomicBool;
use std::sync::{Arc, Barrier, RwLock};
use versionize::{VersionMap, Versionize, VersionizeResult};
use versionize_derive::Versionize;
use vm_device::dma_mapping::ExternalDmaMapping;
use vm_memory::{
Address, ByteValued, Bytes, GuestAddress, GuestAddressSpace, GuestMemoryAtomic,
GuestMemoryError,
};
use vm_migration::VersionMapped;
use vm_migration::{Migratable, MigratableError, Pausable, Snapshot, Snapshottable, Transportable};
use vmm_sys_util::eventfd::EventFd;
/// Queues sizes
const QUEUE_SIZE: u16 = 256;
const NUM_QUEUES: usize = 2;
const QUEUE_SIZES: &[u16] = &[QUEUE_SIZE; NUM_QUEUES];
/// New descriptors are pending on the request queue.
/// "requestq" is meant to be used anytime an action is required to be
/// performed on behalf of the guest driver.
const REQUEST_Q_EVENT: u16 = EPOLL_HELPER_EVENT_LAST + 1;
/// New descriptors are pending on the event queue.
/// "eventq" lets the device report any fault or other asynchronous event to
/// the guest driver.
const EVENT_Q_EVENT: u16 = EPOLL_HELPER_EVENT_LAST + 2;
/// PROBE properties size.
/// This is the minimal size to provide at least one RESV_MEM property.
/// Because virtio-iommu expects one MSI reserved region, we must provide it,
/// otherwise the driver in the guest will define a predefined one between
/// 0x8000000 and 0x80FFFFF, which is only relevant for ARM architecture, but
/// will conflict with x86.
const PROBE_PROP_SIZE: u32 =
(size_of::<VirtioIommuProbeProperty>() + size_of::<VirtioIommuProbeResvMem>()) as u32;
/// Virtio IOMMU features
#[allow(unused)]
const VIRTIO_IOMMU_F_INPUT_RANGE: u32 = 0;
#[allow(unused)]
const VIRTIO_IOMMU_F_DOMAIN_RANGE: u32 = 1;
#[allow(unused)]
const VIRTIO_IOMMU_F_MAP_UNMAP: u32 = 2;
#[allow(unused)]
const VIRTIO_IOMMU_F_BYPASS: u32 = 3;
const VIRTIO_IOMMU_F_PROBE: u32 = 4;
#[allow(unused)]
const VIRTIO_IOMMU_F_MMIO: u32 = 5;
#[allow(unused)]
const VIRTIO_IOMMU_F_BYPASS_CONFIG: u32 = 6;
// Support 2MiB and 4KiB page sizes.
const VIRTIO_IOMMU_PAGE_SIZE_MASK: u64 = (2 << 20) | (4 << 10);
#[derive(Copy, Clone, Debug, Default)]
#[repr(packed)]
struct VirtioIommuRange32 {
start: u32,
end: u32,
}
unsafe impl ByteValued for VirtioIommuRange32 {}
#[derive(Copy, Clone, Debug, Default)]
#[repr(packed)]
struct VirtioIommuRange64 {
start: u64,
end: u64,
}
unsafe impl ByteValued for VirtioIommuRange64 {}
#[derive(Copy, Clone, Debug, Default)]
#[repr(packed)]
struct VirtioIommuConfig {
page_size_mask: u64,
input_range: VirtioIommuRange64,
domain_range: VirtioIommuRange32,
probe_size: u32,
bypass: u8,
reserved: [u8; 7],
}
unsafe impl ByteValued for VirtioIommuConfig {}
/// Virtio IOMMU request type
const VIRTIO_IOMMU_T_ATTACH: u8 = 1;
const VIRTIO_IOMMU_T_DETACH: u8 = 2;
const VIRTIO_IOMMU_T_MAP: u8 = 3;
const VIRTIO_IOMMU_T_UNMAP: u8 = 4;
const VIRTIO_IOMMU_T_PROBE: u8 = 5;
#[derive(Copy, Clone, Debug, Default)]
#[repr(packed)]
struct VirtioIommuReqHead {
type_: u8,
reserved: [u8; 3],
}
unsafe impl ByteValued for VirtioIommuReqHead {}
/// Virtio IOMMU request status
const VIRTIO_IOMMU_S_OK: u8 = 0;
#[allow(unused)]
const VIRTIO_IOMMU_S_IOERR: u8 = 1;
#[allow(unused)]
const VIRTIO_IOMMU_S_UNSUPP: u8 = 2;
#[allow(unused)]
const VIRTIO_IOMMU_S_DEVERR: u8 = 3;
#[allow(unused)]
const VIRTIO_IOMMU_S_INVAL: u8 = 4;
#[allow(unused)]
const VIRTIO_IOMMU_S_RANGE: u8 = 5;
#[allow(unused)]
const VIRTIO_IOMMU_S_NOENT: u8 = 6;
#[allow(unused)]
const VIRTIO_IOMMU_S_FAULT: u8 = 7;
#[allow(unused)]
const VIRTIO_IOMMU_S_NOMEM: u8 = 8;
#[derive(Copy, Clone, Debug, Default)]
#[repr(packed)]
struct VirtioIommuReqTail {
status: u8,
reserved: [u8; 3],
}
unsafe impl ByteValued for VirtioIommuReqTail {}
/// ATTACH request
#[derive(Copy, Clone, Debug, Default)]
#[repr(packed)]
struct VirtioIommuReqAttach {
domain: u32,
endpoint: u32,
reserved: [u8; 8],
}
unsafe impl ByteValued for VirtioIommuReqAttach {}
/// DETACH request
#[derive(Copy, Clone, Debug, Default)]
#[repr(packed)]
struct VirtioIommuReqDetach {
domain: u32,
endpoint: u32,
reserved: [u8; 8],
}
unsafe impl ByteValued for VirtioIommuReqDetach {}
/// Virtio IOMMU request MAP flags
#[allow(unused)]
const VIRTIO_IOMMU_MAP_F_READ: u32 = 1;
#[allow(unused)]
const VIRTIO_IOMMU_MAP_F_WRITE: u32 = 1 << 1;
#[allow(unused)]
const VIRTIO_IOMMU_MAP_F_MMIO: u32 = 1 << 2;
#[allow(unused)]
const VIRTIO_IOMMU_MAP_F_MASK: u32 =
VIRTIO_IOMMU_MAP_F_READ | VIRTIO_IOMMU_MAP_F_WRITE | VIRTIO_IOMMU_MAP_F_MMIO;
/// MAP request
#[derive(Copy, Clone, Debug, Default)]
#[repr(packed)]
struct VirtioIommuReqMap {
domain: u32,
virt_start: u64,
virt_end: u64,
phys_start: u64,
flags: u32,
}
unsafe impl ByteValued for VirtioIommuReqMap {}
/// UNMAP request
#[derive(Copy, Clone, Debug, Default)]
#[repr(packed)]
struct VirtioIommuReqUnmap {
domain: u32,
virt_start: u64,
virt_end: u64,
reserved: [u8; 4],
}
unsafe impl ByteValued for VirtioIommuReqUnmap {}
/// Virtio IOMMU request PROBE types
#[allow(unused)]
const VIRTIO_IOMMU_PROBE_T_NONE: u16 = 0;
const VIRTIO_IOMMU_PROBE_T_RESV_MEM: u16 = 1;
#[allow(unused)]
const VIRTIO_IOMMU_PROBE_T_MASK: u16 = 0xfff;
/// PROBE request
#[derive(Copy, Clone, Debug, Default)]
#[repr(packed)]
struct VirtioIommuReqProbe {
endpoint: u32,
reserved: [u64; 8],
}
unsafe impl ByteValued for VirtioIommuReqProbe {}
#[derive(Copy, Clone, Debug, Default)]
#[repr(packed)]
struct VirtioIommuProbeProperty {
type_: u16,
length: u16,
}
unsafe impl ByteValued for VirtioIommuProbeProperty {}
/// Virtio IOMMU request PROBE property RESV_MEM subtypes
#[allow(unused)]
const VIRTIO_IOMMU_RESV_MEM_T_RESERVED: u8 = 0;
const VIRTIO_IOMMU_RESV_MEM_T_MSI: u8 = 1;
#[derive(Copy, Clone, Debug, Default)]
#[repr(packed)]
struct VirtioIommuProbeResvMem {
subtype: u8,
reserved: [u8; 3],
start: u64,
end: u64,
}
unsafe impl ByteValued for VirtioIommuProbeResvMem {}
/// Virtio IOMMU fault flags
#[allow(unused)]
const VIRTIO_IOMMU_FAULT_F_READ: u32 = 1;
#[allow(unused)]
const VIRTIO_IOMMU_FAULT_F_WRITE: u32 = 1 << 1;
#[allow(unused)]
const VIRTIO_IOMMU_FAULT_F_EXEC: u32 = 1 << 2;
#[allow(unused)]
const VIRTIO_IOMMU_FAULT_F_ADDRESS: u32 = 1 << 8;
/// Virtio IOMMU fault reasons
#[allow(unused)]
const VIRTIO_IOMMU_FAULT_R_UNKNOWN: u32 = 0;
#[allow(unused)]
const VIRTIO_IOMMU_FAULT_R_DOMAIN: u32 = 1;
#[allow(unused)]
const VIRTIO_IOMMU_FAULT_R_MAPPING: u32 = 2;
/// Fault reporting through eventq
#[allow(unused)]
#[derive(Copy, Clone, Debug, Default)]
#[repr(packed)]
struct VirtioIommuFault {
reason: u8,
reserved: [u8; 3],
flags: u32,
endpoint: u32,
reserved2: [u8; 4],
address: u64,
}
unsafe impl ByteValued for VirtioIommuFault {}
#[derive(Debug)]
enum Error {
/// Guest gave us bad memory addresses.
GuestMemory(GuestMemoryError),
/// Guest gave us a write only descriptor that protocol says to read from.
UnexpectedWriteOnlyDescriptor,
/// Guest gave us a read only descriptor that protocol says to write to.
UnexpectedReadOnlyDescriptor,
/// Guest gave us too few descriptors in a descriptor chain.
DescriptorChainTooShort,
/// Guest gave us a buffer that was too short to use.
BufferLengthTooSmall,
/// Guest sent us invalid request.
InvalidRequest,
/// Guest sent us invalid ATTACH request.
InvalidAttachRequest,
/// Guest sent us invalid DETACH request.
InvalidDetachRequest,
/// Guest sent us invalid MAP request.
InvalidMapRequest,
/// Guest sent us invalid UNMAP request.
InvalidUnmapRequest,
/// Guest sent us invalid PROBE request.
InvalidProbeRequest,
/// Failed to performing external mapping.
ExternalMapping(io::Error),
/// Failed to performing external unmapping.
ExternalUnmapping(io::Error),
}
impl Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use self::Error::*;
match self {
BufferLengthTooSmall => write!(f, "buffer length too small"),
DescriptorChainTooShort => write!(f, "descriptor chain too short"),
GuestMemory(e) => write!(f, "bad guest memory address: {}", e),
InvalidRequest => write!(f, "invalid request"),
InvalidAttachRequest => write!(f, "invalid attach request"),
InvalidDetachRequest => write!(f, "invalid detach request"),
InvalidMapRequest => write!(f, "invalid map request"),
InvalidUnmapRequest => write!(f, "invalid unmap request"),
InvalidProbeRequest => write!(f, "invalid probe request"),
UnexpectedReadOnlyDescriptor => write!(f, "unexpected read-only descriptor"),
UnexpectedWriteOnlyDescriptor => write!(f, "unexpected write-only descriptor"),
ExternalMapping(e) => write!(f, "failed performing external mapping: {}", e),
ExternalUnmapping(e) => write!(f, "failed performing external unmapping: {}", e),
}
}
}
struct Request {}
impl Request {
// Parse the available vring buffer. Based on the hashmap table of external
// mappings required from various devices such as VFIO or vhost-user ones,
// this function might update the hashmap table of external mappings per
// domain.
// Basically, the VMM knows about the device_id <=> mapping relationship
// before running the VM, but at runtime, a new domain <=> mapping hashmap
// is created based on the information provided from the guest driver for
// virtio-iommu (giving the link device_id <=> domain).
fn parse(
avail_desc: &DescriptorChain,
mem: &GuestMemoryMmap,
mapping: &Arc<IommuMapping>,
ext_mapping: &BTreeMap<u32, Arc<dyn ExternalDmaMapping>>,
ext_domain_mapping: &mut BTreeMap<u32, Arc<dyn ExternalDmaMapping>>,
msi_iova_space: (u64, u64),
) -> result::Result<usize, Error> {
// The head contains the request type which MUST be readable.
if avail_desc.is_write_only() {
return Err(Error::UnexpectedWriteOnlyDescriptor);
}
if (avail_desc.len as usize) < size_of::<VirtioIommuReqHead>() {
return Err(Error::InvalidRequest);
}
let req_head: VirtioIommuReqHead =
mem.read_obj(avail_desc.addr).map_err(Error::GuestMemory)?;
let req_offset = size_of::<VirtioIommuReqHead>();
let desc_size_left = (avail_desc.len as usize) - req_offset;
let req_addr = if let Some(addr) = avail_desc.addr.checked_add(req_offset as u64) {
addr
} else {
return Err(Error::InvalidRequest);
};
let (msi_iova_start, msi_iova_end) = msi_iova_space;
// Create the reply
let mut reply: Vec<u8> = Vec::new();
let hdr_len = match req_head.type_ {
VIRTIO_IOMMU_T_ATTACH => {
if desc_size_left != size_of::<VirtioIommuReqAttach>() {
return Err(Error::InvalidAttachRequest);
}
let req: VirtioIommuReqAttach = mem
.read_obj(req_addr as GuestAddress)
.map_err(Error::GuestMemory)?;
debug!("Attach request {:?}", req);
// Copy the value to use it as a proper reference.
let domain = req.domain;
let endpoint = req.endpoint;
// Add endpoint associated with specific domain
mapping.endpoints.write().unwrap().insert(endpoint, domain);
// If the endpoint is part of the list of devices with an
// external mapping, insert a new entry for the corresponding
// domain, with the same reference to the trait.
if let Some(map) = ext_mapping.get(&endpoint) {
ext_domain_mapping.insert(domain, map.clone());
}
// Add new domain with no mapping if the entry didn't exist yet
let mut mappings = mapping.mappings.write().unwrap();
mappings.entry(domain).or_insert_with(BTreeMap::new);
0
}
VIRTIO_IOMMU_T_DETACH => {
if desc_size_left != size_of::<VirtioIommuReqDetach>() {
return Err(Error::InvalidDetachRequest);
}
let req: VirtioIommuReqDetach = mem
.read_obj(req_addr as GuestAddress)
.map_err(Error::GuestMemory)?;
debug!("Detach request {:?}", req);
// Copy the value to use it as a proper reference.
let domain = req.domain;
let endpoint = req.endpoint;
// If the endpoint is part of the list of devices with an
// external mapping, remove the entry for the corresponding
// domain.
if ext_mapping.contains_key(&endpoint) {
ext_domain_mapping.remove(&domain);
}
// Remove endpoint associated with specific domain
mapping.endpoints.write().unwrap().remove(&endpoint);
0
}
VIRTIO_IOMMU_T_MAP => {
if desc_size_left != size_of::<VirtioIommuReqMap>() {
return Err(Error::InvalidMapRequest);
}
let req: VirtioIommuReqMap = mem
.read_obj(req_addr as GuestAddress)
.map_err(Error::GuestMemory)?;
debug!("Map request {:?}", req);
// Copy the value to use it as a proper reference.
let domain = req.domain;
// Trigger external mapping if necessary.
if let Some(ext_map) = ext_domain_mapping.get(&domain) {
let size = req.virt_end - req.virt_start + 1;
ext_map
.map(req.virt_start, req.phys_start, size)
.map_err(Error::ExternalMapping)?;
}
// Add new mapping associated with the domain
if let Some(entry) = mapping.mappings.write().unwrap().get_mut(&domain) {
entry.insert(
req.virt_start,
Mapping {
gpa: req.phys_start,
size: req.virt_end - req.virt_start + 1,
},
);
} else {
return Err(Error::InvalidMapRequest);
}
0
}
VIRTIO_IOMMU_T_UNMAP => {
if desc_size_left != size_of::<VirtioIommuReqUnmap>() {
return Err(Error::InvalidUnmapRequest);
}
let req: VirtioIommuReqUnmap = mem
.read_obj(req_addr as GuestAddress)
.map_err(Error::GuestMemory)?;
debug!("Unmap request {:?}", req);
// Copy the value to use it as a proper reference.
let domain = req.domain;
let virt_start = req.virt_start;
// Trigger external unmapping if necessary.
if let Some(ext_map) = ext_domain_mapping.get(&domain) {
let size = req.virt_end - virt_start + 1;
ext_map
.unmap(virt_start, size)
.map_err(Error::ExternalUnmapping)?;
}
// Add new mapping associated with the domain
if let Some(entry) = mapping.mappings.write().unwrap().get_mut(&domain) {
entry.remove(&virt_start);
}
0
}
VIRTIO_IOMMU_T_PROBE => {
if desc_size_left != size_of::<VirtioIommuReqProbe>() {
return Err(Error::InvalidProbeRequest);
}
let req: VirtioIommuReqProbe = mem
.read_obj(req_addr as GuestAddress)
.map_err(Error::GuestMemory)?;
debug!("Probe request {:?}", req);
let probe_prop = VirtioIommuProbeProperty {
type_: VIRTIO_IOMMU_PROBE_T_RESV_MEM,
length: size_of::<VirtioIommuProbeResvMem>() as u16,
};
reply.extend_from_slice(probe_prop.as_slice());
let resv_mem = VirtioIommuProbeResvMem {
subtype: VIRTIO_IOMMU_RESV_MEM_T_MSI,
start: msi_iova_start,
end: msi_iova_end,
..Default::default()
};
reply.extend_from_slice(resv_mem.as_slice());
PROBE_PROP_SIZE
}
_ => return Err(Error::InvalidRequest),
};
let status_desc = avail_desc
.next_descriptor()
.ok_or(Error::DescriptorChainTooShort)?;
// The status MUST always be writable
if !status_desc.is_write_only() {
return Err(Error::UnexpectedReadOnlyDescriptor);
}
if status_desc.len < hdr_len + size_of::<VirtioIommuReqTail>() as u32 {
return Err(Error::BufferLengthTooSmall);
}
let tail = VirtioIommuReqTail {
status: VIRTIO_IOMMU_S_OK,
..Default::default()
};
reply.extend_from_slice(tail.as_slice());
mem.write_slice(reply.as_slice(), status_desc.addr)
.map_err(Error::GuestMemory)?;
Ok((hdr_len as usize) + size_of::<VirtioIommuReqTail>())
}
}
struct IommuEpollHandler {
queues: Vec<Queue>,
mem: GuestMemoryAtomic<GuestMemoryMmap>,
interrupt_cb: Arc<dyn VirtioInterrupt>,
queue_evts: Vec<EventFd>,
kill_evt: EventFd,
pause_evt: EventFd,
mapping: Arc<IommuMapping>,
ext_mapping: BTreeMap<u32, Arc<dyn ExternalDmaMapping>>,
ext_domain_mapping: BTreeMap<u32, Arc<dyn ExternalDmaMapping>>,
msi_iova_space: (u64, u64),
}
impl IommuEpollHandler {
fn request_queue(&mut self) -> bool {
let mut used_desc_heads = [(0, 0); QUEUE_SIZE as usize];
let mut used_count = 0;
let mem = self.mem.memory();
for avail_desc in self.queues[0].iter(&mem) {
let len = match Request::parse(
&avail_desc,
&mem,
&self.mapping,
&self.ext_mapping,
&mut self.ext_domain_mapping,
self.msi_iova_space,
) {
Ok(len) => len as u32,
Err(e) => {
error!("failed parsing descriptor: {}", e);
0
}
};
used_desc_heads[used_count] = (avail_desc.index, len);
used_count += 1;
}
for &(desc_index, len) in &used_desc_heads[..used_count] {
self.queues[0].add_used(&mem, desc_index, len);
}
used_count > 0
}
fn event_queue(&mut self) -> bool {
false
}
fn signal_used_queue(&self, queue: &Queue) -> result::Result<(), DeviceError> {
self.interrupt_cb
.trigger(&VirtioInterruptType::Queue, Some(queue))
.map_err(|e| {
error!("Failed to signal used queue: {:?}", e);
DeviceError::FailedSignalingUsedQueue(e)
})
}
fn run(
&mut self,
paused: Arc<AtomicBool>,
paused_sync: Arc<Barrier>,
) -> result::Result<(), EpollHelperError> {
let mut helper = EpollHelper::new(&self.kill_evt, &self.pause_evt)?;
helper.add_event(self.queue_evts[0].as_raw_fd(), REQUEST_Q_EVENT)?;
helper.add_event(self.queue_evts[1].as_raw_fd(), EVENT_Q_EVENT)?;
helper.run(paused, paused_sync, self)?;
Ok(())
}
}
impl EpollHelperHandler for IommuEpollHandler {
fn handle_event(&mut self, _helper: &mut EpollHelper, event: &epoll::Event) -> bool {
let ev_type = event.data as u16;
match ev_type {
REQUEST_Q_EVENT => {
if let Err(e) = self.queue_evts[0].read() {
error!("Failed to get queue event: {:?}", e);
return true;
} else if self.request_queue() {
if let Err(e) = self.signal_used_queue(&self.queues[0]) {
error!("Failed to signal used queue: {:?}", e);
return true;
}
}
}
EVENT_Q_EVENT => {
if let Err(e) = self.queue_evts[1].read() {
error!("Failed to get queue event: {:?}", e);
return true;
} else if self.event_queue() {
if let Err(e) = self.signal_used_queue(&self.queues[1]) {
error!("Failed to signal used queue: {:?}", e);
return true;
}
}
}
_ => {
error!("Unexpected event: {}", ev_type);
return true;
}
}
false
}
}
#[derive(Clone, Copy, Versionize)]
struct Mapping {
gpa: u64,
size: u64,
}
pub struct IommuMapping {
// Domain related to an endpoint.
endpoints: Arc<RwLock<BTreeMap<u32, u32>>>,
// List of mappings per domain.
mappings: Arc<RwLock<BTreeMap<u32, BTreeMap<u64, Mapping>>>>,
}
impl DmaRemapping for IommuMapping {
fn translate(&self, id: u32, addr: u64) -> std::result::Result<u64, std::io::Error> {
debug!("Translate addr 0x{:x}", addr);
if let Some(domain) = self.endpoints.read().unwrap().get(&id) {
if let Some(mapping) = self.mappings.read().unwrap().get(domain) {
let range_start = if VIRTIO_IOMMU_PAGE_SIZE_MASK > addr {
0
} else {
addr - VIRTIO_IOMMU_PAGE_SIZE_MASK
};
for (&key, &value) in mapping.range((Included(&range_start), Included(&addr))) {
if addr >= key && addr < key + value.size {
let new_addr = addr - key + value.gpa;
debug!("Into new_addr 0x{:x}", new_addr);
return Ok(new_addr);
}
}
}
}
debug!("Into same addr...");
Ok(addr)
}
}
pub struct Iommu {
common: VirtioCommon,
id: String,
config: VirtioIommuConfig,
mapping: Arc<IommuMapping>,
ext_mapping: BTreeMap<u32, Arc<dyn ExternalDmaMapping>>,
seccomp_action: SeccompAction,
exit_evt: EventFd,
msi_iova_space: (u64, u64),
}
#[derive(Versionize)]
struct IommuState {
avail_features: u64,
acked_features: u64,
endpoints: Vec<(u32, u32)>,
mappings: Vec<(u32, Vec<(u64, Mapping)>)>,
}
impl VersionMapped for IommuState {}
impl Iommu {
pub fn new(
id: String,
seccomp_action: SeccompAction,
exit_evt: EventFd,
msi_iova_space: (u64, u64),
) -> io::Result<(Self, Arc<IommuMapping>)> {
let config = VirtioIommuConfig {
page_size_mask: VIRTIO_IOMMU_PAGE_SIZE_MASK,
probe_size: PROBE_PROP_SIZE,
..Default::default()
};
let mapping = Arc::new(IommuMapping {
endpoints: Arc::new(RwLock::new(BTreeMap::new())),
mappings: Arc::new(RwLock::new(BTreeMap::new())),
});
Ok((
Iommu {
id,
common: VirtioCommon {
device_type: VirtioDeviceType::Iommu as u32,
queue_sizes: QUEUE_SIZES.to_vec(),
avail_features: 1u64 << VIRTIO_F_VERSION_1
| 1u64 << VIRTIO_IOMMU_F_MAP_UNMAP
| 1u64 << VIRTIO_IOMMU_F_PROBE,
paused_sync: Some(Arc::new(Barrier::new(2))),
..Default::default()
},
config,
mapping: mapping.clone(),
ext_mapping: BTreeMap::new(),
seccomp_action,
exit_evt,
msi_iova_space,
},
mapping,
))
}
fn state(&self) -> IommuState {
IommuState {
avail_features: self.common.avail_features,
acked_features: self.common.acked_features,
endpoints: self
.mapping
.endpoints
.read()
.unwrap()
.clone()
.into_iter()
.collect(),
mappings: self
.mapping
.mappings
.read()
.unwrap()
.clone()
.into_iter()
.map(|(k, v)| (k, v.into_iter().collect()))
.collect(),
}
}
fn set_state(&mut self, state: &IommuState) {
self.common.avail_features = state.avail_features;
self.common.acked_features = state.acked_features;
*(self.mapping.endpoints.write().unwrap()) = state.endpoints.clone().into_iter().collect();
*(self.mapping.mappings.write().unwrap()) = state
.mappings
.clone()
.into_iter()
.map(|(k, v)| (k, v.into_iter().collect()))
.collect();
}
pub fn add_external_mapping(&mut self, device_id: u32, mapping: Arc<dyn ExternalDmaMapping>) {
self.ext_mapping.insert(device_id, mapping);
}
}
impl Drop for Iommu {
fn drop(&mut self) {
if let Some(kill_evt) = self.common.kill_evt.take() {
// Ignore the result because there is nothing we can do about it.
let _ = kill_evt.write(1);
}
}
}
impl VirtioDevice for Iommu {
fn device_type(&self) -> u32 {
self.common.device_type
}
fn queue_max_sizes(&self) -> &[u16] {
&self.common.queue_sizes
}
fn features(&self) -> u64 {
self.common.avail_features
}
fn ack_features(&mut self, value: u64) {
self.common.ack_features(value)
}
fn read_config(&self, offset: u64, data: &mut [u8]) {
self.read_config_from_slice(self.config.as_slice(), offset, data);
}
fn activate(
&mut self,
mem: GuestMemoryAtomic<GuestMemoryMmap>,
interrupt_cb: Arc<dyn VirtioInterrupt>,
queues: Vec<Queue>,
queue_evts: Vec<EventFd>,
) -> ActivateResult {
self.common.activate(&queues, &queue_evts, &interrupt_cb)?;
let (kill_evt, pause_evt) = self.common.dup_eventfds();
let mut handler = IommuEpollHandler {
queues,
mem,
interrupt_cb,
queue_evts,
kill_evt,
pause_evt,
mapping: self.mapping.clone(),
ext_mapping: self.ext_mapping.clone(),
ext_domain_mapping: BTreeMap::new(),
msi_iova_space: self.msi_iova_space,
};
let paused = self.common.paused.clone();
let paused_sync = self.common.paused_sync.clone();
let mut epoll_threads = Vec::new();
spawn_virtio_thread(
&self.id,
&self.seccomp_action,
Thread::VirtioIommu,
&mut epoll_threads,
&self.exit_evt,
move || {
if let Err(e) = handler.run(paused, paused_sync.unwrap()) {
error!("Error running worker: {:?}", e);
}
},
)?;
self.common.epoll_threads = Some(epoll_threads);
event!("virtio-device", "activated", "id", &self.id);
Ok(())
}
fn reset(&mut self) -> Option<Arc<dyn VirtioInterrupt>> {
let result = self.common.reset();
event!("virtio-device", "reset", "id", &self.id);
result
}
}
impl Pausable for Iommu {
fn pause(&mut self) -> result::Result<(), MigratableError> {
self.common.pause()
}
fn resume(&mut self) -> result::Result<(), MigratableError> {
self.common.resume()
}
}
impl Snapshottable for Iommu {
fn id(&self) -> String {
self.id.clone()
}
fn snapshot(&mut self) -> std::result::Result<Snapshot, MigratableError> {
Snapshot::new_from_versioned_state(&self.id, &self.state())
}
fn restore(&mut self, snapshot: Snapshot) -> std::result::Result<(), MigratableError> {
self.set_state(&snapshot.to_versioned_state(&self.id)?);
Ok(())
}
}
impl Transportable for Iommu {}
impl Migratable for Iommu {}