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vm-virtio: Modify VirtioInterrupt callback into a trait

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Callbacks are not the most Rust idiomatic way of programming. The right
way is to use a Trait to provide multiple implementation of the same
interface.

Additionally, a Trait will allow for multiple functions to be defined
while using callbacks means that a new callback must be introduced for
each new function we want to add.

For these two reasons, the current commit modifies the existing
VirtioInterrupt callback into a Trait of the same name.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf
2020-01-13 18:52:19 +01:00
committed by Samuel Ortiz
parent ef7d889a79
commit c396baca46
18 changed files with 221 additions and 223 deletions
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40
vmm/src/device_manager.rs
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@@ -26,11 +26,9 @@ use libc::O_TMPFILE;
use libc::TIOCGWINSZ;
#[cfg(feature = "pci_support")]
use pci::{
DeviceRelocation, InterruptDelivery, InterruptParameters, PciBarRegionType, PciBus,
PciConfigIo, PciConfigMmio, PciDevice, PciRoot,
DeviceRelocation, PciBarRegionType, PciBus, PciConfigIo, PciConfigMmio, PciDevice, PciRoot,
};
use qcow::{self, ImageType, QcowFile};
use std::cmp;
#[cfg(feature = "pci_support")]
use std::collections::HashMap;
use std::fs::{File, OpenOptions};
@@ -1493,41 +1491,7 @@ impl DeviceManager {
.map_err(DeviceManagerError::RegisterIoevent)?;
}
let vm_fd_clone = vm_fd.clone();
let msi_cb = Arc::new(Box::new(move |p: InterruptParameters| {
if let Some(entry) = p.msix {
use kvm_bindings::kvm_msi;
let msi_queue = kvm_msi {
address_lo: entry.msg_addr_lo,
address_hi: entry.msg_addr_hi,
data: entry.msg_data,
flags: 0u32,
devid: 0u32,
pad: [0u8; 12],
};
return vm_fd_clone
.signal_msi(msi_queue)
.map_err(|e| io::Error::from_raw_os_error(e.errno()))
.map(|ret| match ret.cmp(&0) {
cmp::Ordering::Greater => {
debug!("MSI message successfully delivered");
}
cmp::Ordering::Equal => {
warn!("failed to deliver MSI message, blocked by guest");
}
_ => {}
});
}
Err(std::io::Error::new(
std::io::ErrorKind::Other,
"missing MSI-X entry",
))
}) as InterruptDelivery);
virtio_pci_device.assign_msix(msi_cb);
virtio_pci_device.assign_msix();
let virtio_pci_device = Arc::new(Mutex::new(virtio_pci_device));