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vmm: Create shared memory region for virtio-fs

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When the cache_size parameter from virtio-fs device is not empty, the
VMM creates a dedicated memory region where the shared files will be
memory mapped by the virtio-fs device.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf
2019-08-05 13:04:24 -07:00
committed by Samuel Ortiz
parent 74225ab5b3
commit 3c29c47783
2 changed files with 81 additions and 3 deletions
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12
vm-virtio/src/fs.rs
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@@ -3,7 +3,9 @@
use super::Error as DeviceError;
use super::{ActivateError, ActivateResult, Queue, VirtioDevice, VirtioDeviceType};
use crate::{VirtioInterrupt, VirtioInterruptType, VIRTIO_F_VERSION_1_BITMASK};
use crate::{
VirtioInterrupt, VirtioInterruptType, VirtioSharedMemoryList, VIRTIO_F_VERSION_1_BITMASK,
};
use epoll;
use libc::EFD_NONBLOCK;
use std::cmp;
@@ -183,7 +185,13 @@ pub struct Fs {
impl Fs {
/// Create a new virtio-fs device.
pub fn new(path: &str, tag: &str, req_num_queues: usize, queue_size: u16) -> Result<Fs> {
pub fn new(
path: &str,
tag: &str,
req_num_queues: usize,
queue_size: u16,
_cache_addr: Option<(VirtioSharedMemoryList, u64)>,
) -> Result<Fs> {
// Calculate the actual number of queues needed.
let num_queues = NUM_QUEUE_OFFSET + req_num_queues;
// Connect to the vhost-user socket.