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virtio-devices: Set AccessPlatform trait through VirtioDevice

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Add a new method set_access_platform() to the VirtioDevice trait in
order to allow an AccessPlatform trait to be setup on any virtio device.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2022-01-26 14:14:33 +01:00 committed by Rob Bradford
parent 7d09df468d
commit 75b9e70ec8
1 changed files with 17 additions and 3 deletions
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20
virtio-devices/src/device.rs
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@ -6,8 +6,10 @@
//
// SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
use crate::{ActivateError, ActivateResult, Error};
use crate::{GuestMemoryMmap, GuestRegionMmap};
use crate::{
ActivateError, ActivateResult, Error, GuestMemoryMmap, GuestRegionMmap,
VIRTIO_F_RING_INDIRECT_DESC,
};
use libc::EFD_NONBLOCK;
use std::collections::HashMap;
use std::io::Write;
@ -17,7 +19,7 @@ use std::sync::{
Arc, Barrier,
};
use std::thread;
use virtio_queue::Queue;
use virtio_queue::{AccessPlatform, Queue};
use vm_memory::{GuestAddress, GuestMemoryAtomic, GuestUsize};
use vm_migration::{MigratableError, Pausable};
use vm_virtio::VirtioDeviceType;
@ -191,6 +193,10 @@ pub trait VirtioDevice: Send {
offset_config.write_all(data).unwrap();
}
}
/// Set the access platform trait to let the device perform address
/// translations if needed.
fn set_access_platform(&mut self, _access_platform: Arc<dyn AccessPlatform>) {}
}
/// Trait providing address translation the same way a physical DMA remapping
@ -218,6 +224,7 @@ pub struct VirtioCommon {
pub queue_sizes: Vec<u16>,
pub device_type: u32,
pub min_queues: u16,
pub access_platform: Option<Arc<dyn AccessPlatform>>,
}
impl VirtioCommon {
@ -320,6 +327,13 @@ impl VirtioCommon {
self.pause_evt.as_ref().unwrap().try_clone().unwrap(),
)
}
pub fn set_access_platform(&mut self, access_platform: Arc<dyn AccessPlatform>) {
self.access_platform = Some(access_platform);
// Indirect descriptors feature is not supported when the device
// requires the addresses held by the descriptors to be translated.
self.avail_features &= !(1 << VIRTIO_F_RING_INDIRECT_DESC);
}
}
impl Pausable for VirtioCommon {