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vm-virtio: initialize MSI-X vectors with VIRTIO_MSI_NO_VECTOR

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In case of the virtio frontend driver doesn't need interupts for
certain queue event, it may explicitly write VIRTIO_MSI_NO_VECTOR
to the virtio common configuration, or it may doesn't configure
the event type vector at all.

This patch initializes both MSI-X configuration vector and queue vector
with VIRTIO_MSI_NO_VECTOR, so that the backend drivers won't trigger
unexpected interrupts to the guest.

Signed-off-by: Zide Chen <zide.chen@intel.com>
This commit is contained in:
Zide Chen 2021-03-16 11:19:28 -07:00 committed by Sebastien Boeuf
parent 40a3c31df4
commit f685f0e0b2
4 changed files with 8 additions and 8 deletions
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2
virtio-devices/src/lib.rs
View File

@ -75,8 +75,6 @@ const VIRTIO_F_VERSION_1: u32 = 32;
const VIRTIO_F_IOMMU_PLATFORM: u32 = 33;
const VIRTIO_F_IN_ORDER: u32 = 35;
const VIRTIO_MSI_NO_VECTOR: u16 = 0xffff;
#[derive(Debug)]
pub enum ActivateError {
EpollCtl(std::io::Error),

6
virtio-devices/src/transport/pci_device.rs
View File

@ -16,7 +16,7 @@ use crate::transport::VirtioTransport;
use crate::{
ActivateResult, Queue, VirtioDevice, VirtioDeviceType, VirtioInterrupt, VirtioInterruptType,
DEVICE_ACKNOWLEDGE, DEVICE_DRIVER, DEVICE_DRIVER_OK, DEVICE_FAILED, DEVICE_FEATURES_OK,
DEVICE_INIT, VIRTIO_MSI_NO_VECTOR,
DEVICE_INIT,
};
use anyhow::anyhow;
use libc::EFD_NONBLOCK;
@ -45,7 +45,7 @@ use vm_migration::{
Migratable, MigratableError, Pausable, Snapshot, SnapshotDataSection, Snapshottable,
Transportable,
};
use vm_virtio::{queue, VirtioIommuRemapping};
use vm_virtio::{queue, VirtioIommuRemapping, VIRTIO_MSI_NO_VECTOR};
use vmm_sys_util::{errno::Result, eventfd::EventFd};
#[derive(Debug)]
@ -423,7 +423,7 @@ impl VirtioPciDevice {
device_feature_select: 0,
driver_feature_select: 0,
queue_select: 0,
msix_config: Arc::new(AtomicU16::new(0)),
msix_config: Arc::new(AtomicU16::new(VIRTIO_MSI_NO_VECTOR)),
},
msix_config,
msix_num,

2
vm-virtio/src/lib.rs
View File

@ -23,6 +23,8 @@ pub use queue::*;
pub type VirtioIommuRemapping =
Box<dyn Fn(u64) -> std::result::Result<u64, std::io::Error> + Send + Sync>;
pub const VIRTIO_MSI_NO_VECTOR: u16 = 0xffff;
// Types taken from linux/virtio_ids.h
#[derive(Copy, Clone, Debug)]
#[allow(dead_code)]

6
vm-virtio/src/queue.rs
View File

@ -8,7 +8,7 @@
//
// SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
use crate::VirtioIommuRemapping;
use crate::{VirtioIommuRemapping, VIRTIO_MSI_NO_VECTOR};
use std::cmp::min;
use std::convert::TryInto;
use std::fmt::{self, Display};
@ -438,7 +438,7 @@ impl Queue {
max_size,
size: max_size,
ready: false,
vector: 0,
vector: VIRTIO_MSI_NO_VECTOR,
desc_table: GuestAddress(0),
avail_ring: GuestAddress(0),
used_ring: GuestAddress(0),
@ -486,7 +486,7 @@ impl Queue {
self.size = self.max_size;
self.next_avail = Wrapping(0);
self.next_used = Wrapping(0);
self.vector = 0;
self.vector = VIRTIO_MSI_NO_VECTOR;
self.desc_table = GuestAddress(0);
self.avail_ring = GuestAddress(0);
self.used_ring = GuestAddress(0);