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virtio-devices: balloon: Port to VirtioCommon for feature handling

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Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2020-09-03 10:37:36 +01:00 committed by Sebastien Boeuf
parent dc9f1e4cdf
commit 4bb00224b4
1 changed files with 8 additions and 16 deletions
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24
virtio-devices/src/balloon.rs
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@ -14,7 +14,7 @@
use super::{
ActivateError, ActivateResult, EpollHelper, EpollHelperError, EpollHelperHandler, Queue,
VirtioDevice, VirtioDeviceType, EPOLL_HELPER_EVENT_LAST, VIRTIO_F_VERSION_1,
VirtioCommon, VirtioDevice, VirtioDeviceType, EPOLL_HELPER_EVENT_LAST, VIRTIO_F_VERSION_1,
};
use crate::seccomp_filters::{get_seccomp_filter, Thread};
use crate::vm_memory::GuestMemory;
@ -308,12 +308,11 @@ impl EpollHelperHandler for BalloonEpollHandler {
// Virtio device for exposing entropy to the guest OS through virtio.
pub struct Balloon {
common: VirtioCommon,
id: String,
resize: VirtioBalloonResize,
kill_evt: Option<EventFd>,
pause_evt: Option<EventFd>,
avail_features: u64,
pub acked_features: u64,
config: Arc<Mutex<VirtioBalloonConfig>>,
queue_evts: Option<Vec<EventFd>>,
interrupt_cb: Option<Arc<dyn VirtioInterrupt>>,
@ -332,12 +331,14 @@ impl Balloon {
config.num_pages = (size >> PAGE_SHIFT) as u32;
Ok(Balloon {
common: VirtioCommon {
avail_features,
acked_features: 0u64,
},
id,
resize: VirtioBalloonResize::new()?,
kill_evt: None,
pause_evt: None,
avail_features,
acked_features: 0u64,
config: Arc::new(Mutex::new(config)),
queue_evts: None,
interrupt_cb: None,
@ -372,20 +373,11 @@ impl VirtioDevice for Balloon {
}
fn features(&self) -> u64 {
self.avail_features
self.common.avail_features
}
fn ack_features(&mut self, value: u64) {
let mut v = value;
// Check if the guest is ACK'ing a feature that we didn't claim to have.
let unrequested_features = v & !self.avail_features;
if unrequested_features != 0 {
warn!("Received acknowledge request for unknown feature.");
// Don't count these features as acked.
v &= !unrequested_features;
}
self.acked_features |= v;
self.common.ack_features(value)
}
fn read_config(&self, offset: u64, data: &mut [u8]) {