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vm-virtio: Add IOMMU support to virtio-rng

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Adding virtio feature VIRTIO_F_IOMMU_PLATFORM when explicitly asked by
the user. The need for this feature is to be able to attach the virtio
device to a virtual IOMMU.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2019-10-04 10:39:42 -07:00 committed by Samuel Ortiz
parent ee1899c6f6
commit 9ab00dcb75
2 changed files with 9 additions and 5 deletions
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10
vm-virtio/src/rng.rs
View File

@ -15,7 +15,7 @@ use std::thread;
use super::Error as DeviceError;
use super::{
ActivateError, ActivateResult, DeviceEventT, Queue, VirtioDevice, VirtioDeviceType,
VIRTIO_F_VERSION_1,
VIRTIO_F_IOMMU_PLATFORM, VIRTIO_F_VERSION_1,
};
use crate::{VirtioInterrupt, VirtioInterruptType};
use vm_memory::{Bytes, GuestMemoryMmap};
@ -164,9 +164,13 @@ pub struct Rng {
impl Rng {
/// Create a new virtio rng device that gets random data from /dev/urandom.
pub fn new(path: &str) -> io::Result<Rng> {
pub fn new(path: &str, iommu: bool) -> io::Result<Rng> {
let random_file = File::open(path)?;
let avail_features = 1u64 << VIRTIO_F_VERSION_1;
let mut avail_features = 1u64 << VIRTIO_F_VERSION_1;
if iommu {
avail_features |= 1u64 << VIRTIO_F_IOMMU_PLATFORM;
}
Ok(Rng {
kill_evt: None,

4
vmm/src/device_manager.rs
View File

@ -634,8 +634,8 @@ impl DeviceManager {
// Add virtio-rng if required
if let Some(rng_path) = vm_info.vm_cfg.rng.src.to_str() {
let virtio_rng_device =
vm_virtio::Rng::new(rng_path).map_err(DeviceManagerError::CreateVirtioRng)?;
let virtio_rng_device = vm_virtio::Rng::new(rng_path, false)
.map_err(DeviceManagerError::CreateVirtioRng)?;
devices.push(Box::new(virtio_rng_device) as Box<dyn vm_virtio::VirtioDevice>);
}