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virtio-devices: iommu: Fix list of external mappings

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In case an external mapping would have been added after the virtio-iommu
device has been activated, it would have simply be ignored because the
code wasn't using a shared object between the vmm thread and the iommu
thread. This behavior is only triggered on the hotplug codepath, and
only if the hotplugged device is placed behind the virtual IOMMU.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2022-04-04 16:23:49 +02:00
parent 1cdf8b232d
commit e9b1ad9558
1 changed files with 6 additions and 6 deletions
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12
virtio-devices/src/iommu.rs
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@ -20,7 +20,7 @@ use std::ops::Bound::Included;
use std::os::unix::io::AsRawFd; use std::os::unix::io::AsRawFd;
use std::result; use std::result;
use std::sync::atomic::AtomicBool; use std::sync::atomic::AtomicBool;
use std::sync::{Arc, Barrier, RwLock}; use std::sync::{Arc, Barrier, Mutex, RwLock};
use versionize::{VersionMap, Versionize, VersionizeResult}; use versionize::{VersionMap, Versionize, VersionizeResult};
use versionize_derive::Versionize; use versionize_derive::Versionize;
use virtio_queue::{DescriptorChain, Queue}; use virtio_queue::{DescriptorChain, Queue};
@ -572,7 +572,7 @@ struct IommuEpollHandler {
kill_evt: EventFd, kill_evt: EventFd,
pause_evt: EventFd, pause_evt: EventFd,
mapping: Arc<IommuMapping>, mapping: Arc<IommuMapping>,
ext_mapping: BTreeMap<u32, Arc<dyn ExternalDmaMapping>>, ext_mapping: Arc<Mutex<BTreeMap<u32, Arc<dyn ExternalDmaMapping>>>>,
ext_domain_mapping: BTreeMap<u32, Arc<dyn ExternalDmaMapping>>, ext_domain_mapping: BTreeMap<u32, Arc<dyn ExternalDmaMapping>>,
msi_iova_space: (u64, u64), msi_iova_space: (u64, u64),
} }
@ -585,7 +585,7 @@ impl IommuEpollHandler {
let len = match Request::parse( let len = match Request::parse(
&mut desc_chain, &mut desc_chain,
&self.mapping, &self.mapping,
&self.ext_mapping, &self.ext_mapping.lock().unwrap(),
&mut self.ext_domain_mapping, &mut self.ext_domain_mapping,
self.msi_iova_space, self.msi_iova_space,
) { ) {
@ -751,7 +751,7 @@ pub struct Iommu {
id: String, id: String,
config: VirtioIommuConfig, config: VirtioIommuConfig,
mapping: Arc<IommuMapping>, mapping: Arc<IommuMapping>,
ext_mapping: BTreeMap<u32, Arc<dyn ExternalDmaMapping>>, ext_mapping: Arc<Mutex<BTreeMap<u32, Arc<dyn ExternalDmaMapping>>>>,
seccomp_action: SeccompAction, seccomp_action: SeccompAction,
exit_evt: EventFd, exit_evt: EventFd,
msi_iova_space: (u64, u64), msi_iova_space: (u64, u64),
@ -799,7 +799,7 @@ impl Iommu {
}, },
config, config,
mapping: mapping.clone(), mapping: mapping.clone(),
ext_mapping: BTreeMap::new(), ext_mapping: Arc::new(Mutex::new(BTreeMap::new())),
seccomp_action, seccomp_action,
exit_evt, exit_evt,
msi_iova_space, msi_iova_space,
@ -845,7 +845,7 @@ impl Iommu {
} }
pub fn add_external_mapping(&mut self, device_id: u32, mapping: Arc<dyn ExternalDmaMapping>) { pub fn add_external_mapping(&mut self, device_id: u32, mapping: Arc<dyn ExternalDmaMapping>) {
self.ext_mapping.insert(device_id, mapping); self.ext_mapping.lock().unwrap().insert(device_id, mapping);
} }
} }