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vm-virtio: Add IOMMU support to virtio-net

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Adding virtio feature VIRTIO_F_IOMMU_PLATFORM when explicitly asked by
the user. The need for this feature is to be able to attach the virtio
device to a virtual IOMMU.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2019-10-02 14:26:02 -07:00 committed by Samuel Ortiz
parent 9ebb1a55bc
commit 9fad680db1
2 changed files with 14 additions and 5 deletions
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15
vm-virtio/src/net.rs
View File

@ -445,7 +445,7 @@ pub struct Net {
impl Net {
/// Create a new virtio network device with the given TAP interface.
pub fn new_with_tap(tap: Tap, guest_mac: Option<&MacAddr>) -> Result<Self> {
pub fn new_with_tap(tap: Tap, guest_mac: Option<&MacAddr>, iommu: bool) -> Result<Self> {
// Set offload flags to match the virtio features below.
tap.set_offload(
net_gen::TUN_F_CSUM | net_gen::TUN_F_UFO | net_gen::TUN_F_TSO4 | net_gen::TUN_F_TSO6,
@ -464,6 +464,10 @@ impl Net {
| 1 << VIRTIO_NET_F_HOST_UFO
| 1 << VIRTIO_F_VERSION_1;
if iommu {
avail_features |= 1u64 << VIRTIO_F_IOMMU_PLATFORM;
}
let mut config_space;
if let Some(mac) = guest_mac {
config_space = Vec::with_capacity(MAC_ADDR_LEN);
@ -490,13 +494,18 @@ impl Net {
/// Create a new virtio network device with the given IP address and
/// netmask.
pub fn new(ip_addr: Ipv4Addr, netmask: Ipv4Addr, guest_mac: Option<&MacAddr>) -> Result<Self> {
pub fn new(
ip_addr: Ipv4Addr,
netmask: Ipv4Addr,
guest_mac: Option<&MacAddr>,
iommu: bool,
) -> Result<Self> {
let tap = Tap::new().map_err(Error::TapOpen)?;
tap.set_ip_addr(ip_addr).map_err(Error::TapSetIp)?;
tap.set_netmask(netmask).map_err(Error::TapSetNetmask)?;
tap.enable().map_err(Error::TapEnable)?;
Self::new_with_tap(tap, guest_mac)
Self::new_with_tap(tap, guest_mac, iommu)
}
}

4
vmm/src/device_manager.rs
View File

@ -612,10 +612,10 @@ impl DeviceManager {
for net_cfg in net_list_cfg.iter() {
let virtio_net_device = if let Some(ref tap_if_name) = net_cfg.tap {
let tap = Tap::open_named(tap_if_name).map_err(DeviceManagerError::OpenTap)?;
vm_virtio::Net::new_with_tap(tap, Some(&net_cfg.mac))
vm_virtio::Net::new_with_tap(tap, Some(&net_cfg.mac), false)
.map_err(DeviceManagerError::CreateVirtioNet)?
} else {
vm_virtio::Net::new(net_cfg.ip, net_cfg.mask, Some(&net_cfg.mac))
vm_virtio::Net::new(net_cfg.ip, net_cfg.mask, Some(&net_cfg.mac), false)
.map_err(DeviceManagerError::CreateVirtioNet)?
};