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// Copyright 2019 Intel Corporation. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
use libc;
use libc::EFD_NONBLOCK;
use std::os::unix::io::AsRawFd;
use std::vec::Vec;
use sys_util::{EventFd, GuestMemory};
use vm_memory::{Address, Error as MmapError};
use super::super::Queue;
use super::{Error, Result};
use vhost_rs::vhost_user::{Master, VhostUserMaster};
use vhost_rs::{VhostBackend, VhostUserMemoryRegionInfo, VringConfigData};
#[derive(Debug, Copy, Clone)]
pub struct VhostUserConfig<'a> {
pub sock: &'a str,
pub num_queues: usize,
pub queue_size: u16,
}
pub fn setup_vhost_user_vring(
vu: &mut Master,
mem: &GuestMemory,
queues: Vec<Queue>,
queue_evts: Vec<EventFd>,
) -> Result<Vec<(vmm_sys_util::eventfd::EventFd, Queue)>> {
let mut regions: Vec<VhostUserMemoryRegionInfo> = Vec::new();
mem.with_regions(
|_index,
region_guest_base,
region_mapping_size,
region_mapping_as_ptr,
region_memfd_offset| {
let vhost_user_net_reg = VhostUserMemoryRegionInfo {
guest_phys_addr: region_guest_base.0,
memory_size: region_mapping_size as u64,
userspace_addr: region_mapping_as_ptr as u64,
mmap_offset: region_memfd_offset as u64,
mmap_handle: mem.as_raw_fd(),
};
regions.push(vhost_user_net_reg);
Ok(())
},
)
.map_err(Error::VhostUserMemoryRegion)?;
vu.set_mem_table(regions.as_slice())
.map_err(Error::VhostUserSetMemTable)?;
let mut vu_interrupt_list = Vec::new();
for (queue_index, queue) in queues.into_iter().enumerate() {
vu.set_vring_num(queue_index, queue.max_size)
.map_err(Error::VhostUserSetVringNum)?;
let config_data = VringConfigData {
queue_max_size: queue.max_size,
queue_size: queue.actual_size(),
flags: 0u32,
desc_table_addr: mem
.get_host_address(queue.desc_table)
.map_err(Error::DescriptorTableAddress)? as u64,
used_ring_addr: mem
.get_host_address(queue.used_ring)
.map_err(Error::UsedAddress)? as u64,
avail_ring_addr: mem
.get_host_address(queue.avail_ring)
.map_err(Error::AvailAddress)? as u64,
log_addr: None,
};
vu.set_vring_addr(queue_index, &config_data)
.map_err(Error::VhostUserSetVringAddr)?;
vu.set_vring_base(queue_index, 0u16)
.map_err(Error::VhostUserSetVringBase)?;
let vhost_user_interrupt =
vmm_sys_util::eventfd::EventFd::new(EFD_NONBLOCK).map_err(Error::VhostIrqCreate)?;
vu.set_vring_call(queue_index, &vhost_user_interrupt)
.map_err(Error::VhostUserSetVringCall)?;
vu_interrupt_list.push((vhost_user_interrupt, queue));
vu.set_vring_kick(queue_index, &queue_evts[queue_index])
.map_err(Error::VhostUserSetVringKick)?;
vu.set_vring_enable(queue_index, true)
.map_err(Error::VhostUserSetVringEnable)?;
}
Ok(vu_interrupt_list)
}
pub fn setup_vhost_user(
vu: &mut Master,
mem: &GuestMemory,
queues: Vec<Queue>,
queue_evts: Vec<EventFd>,
acked_features: u64,
) -> Result<Vec<(vmm_sys_util::eventfd::EventFd, Queue)>> {
let backend_features = vu.get_features().unwrap();
vu.set_features(acked_features & backend_features)
.map_err(Error::VhostUserSetFeatures)?;
setup_vhost_user_vring(vu, mem, queues, queue_evts)
}
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