cloud-hypervisor/vmm/src/config.rs

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// Copyright © 2019 Intel Corporation
//
// SPDX-License-Identifier: Apache-2.0
//
use linux_loader::cmdline::Cmdline;
use net_util::MacAddr;
use std::convert::From;
use std::net::AddrParseError;
use std::net::Ipv4Addr;
use std::path::Path;
use std::result;
use vm_memory::GuestAddress;
pub const DEFAULT_VCPUS: &str = "1";
pub const DEFAULT_MEMORY: &str = "size=512";
pub const DEFAULT_RNG_SOURCE: &str = "/dev/urandom";
const CMDLINE_OFFSET: GuestAddress = GuestAddress(0x20000);
/// Errors associated with VM configuration parameters.
#[derive(Debug)]
pub enum Error<'a> {
/// Failed parsing cpus parameters.
ParseCpusParams(std::num::ParseIntError),
/// Failed parsing memory file parameter.
ParseMemoryFileParam,
/// Failed parsing kernel parameters.
ParseKernelParams,
/// Failed parsing kernel command line parameters.
ParseCmdlineParams,
/// Failed parsing disks parameters.
ParseDisksParams,
/// Failed parsing random number generator parameters.
ParseRngParams,
/// Failed parsing network ip parameter.
ParseNetIpParam(AddrParseError),
/// Failed parsing network mask parameter.
ParseNetMaskParam(AddrParseError),
/// Failed parsing network mac parameter.
ParseNetMacParam(&'a str),
/// Failed parsing fs tag parameter.
ParseFsTagParam,
/// Failed parsing fs socket path parameter.
ParseFsSockParam,
/// Failed parsing fs number of queues parameter.
ParseFsNumQueuesParam(std::num::ParseIntError),
/// Failed parsing fs queue size parameter.
ParseFsQueueSizeParam(std::num::ParseIntError),
/// Failed parsing persitent memory file parameter.
ParsePmemFileParam,
/// Failed parsing size parameter.
ParseSizeParam(std::num::ParseIntError),
}
pub type Result<'a, T> = result::Result<T, Error<'a>>;
pub struct VmParams<'a> {
pub cpus: &'a str,
pub memory: &'a str,
pub kernel: &'a str,
pub cmdline: Option<&'a str>,
pub disks: Vec<&'a str>,
pub net: Option<&'a str>,
pub rng: &'a str,
pub fs: Option<Vec<&'a str>>,
pub pmem: Option<Vec<&'a str>>,
}
fn parse_size(size: &str) -> Result<u64> {
let s = size.trim();
let shift = if s.ends_with('K') {
10
} else if s.ends_with('M') {
20
} else if s.ends_with('G') {
30
} else {
0
};
let s = s.trim_end_matches(|c| c == 'K' || c == 'M' || c == 'G');
let res = s.parse::<u64>().map_err(Error::ParseSizeParam)?;
Ok(res << shift)
}
pub struct CpusConfig(pub u8);
impl CpusConfig {
pub fn parse(cpus: &str) -> Result<Self> {
Ok(CpusConfig(
cpus.parse::<u8>().map_err(Error::ParseCpusParams)?,
))
}
}
impl From<&CpusConfig> for u8 {
fn from(val: &CpusConfig) -> Self {
val.0
}
}
pub struct MemoryConfig<'a> {
pub size: u64,
pub file: Option<&'a Path>,
}
impl<'a> MemoryConfig<'a> {
pub fn parse(memory: &'a str) -> Result<Self> {
// Split the parameters based on the comma delimiter
let params_list: Vec<&str> = memory.split(',').collect();
let mut size_str: &str = "";
let mut file_str: &str = "";
let mut backed = false;
for param in params_list.iter() {
if param.starts_with("size=") {
size_str = &param[5..];
} else if param.starts_with("file=") {
backed = true;
file_str = &param[5..];
}
}
let file = if backed {
if file_str.is_empty() {
return Err(Error::ParseMemoryFileParam);
}
Some(Path::new(file_str))
} else {
None
};
Ok(MemoryConfig {
size: parse_size(size_str)?,
file,
})
}
}
pub struct KernelConfig<'a> {
pub path: &'a Path,
}
impl<'a> KernelConfig<'a> {
pub fn parse(kernel: &'a str) -> Result<Self> {
Ok(KernelConfig {
path: Path::new(kernel),
})
}
}
pub struct CmdlineConfig {
pub args: Cmdline,
pub offset: GuestAddress,
}
impl CmdlineConfig {
pub fn parse(cmdline: Option<&str>) -> Result<Self> {
let cmdline_str = cmdline
.map(std::string::ToString::to_string)
.unwrap_or_else(String::new);
let mut args = Cmdline::new(arch::CMDLINE_MAX_SIZE);
args.insert_str(cmdline_str).unwrap();
Ok(CmdlineConfig {
args,
offset: CMDLINE_OFFSET,
})
}
}
#[derive(Debug)]
pub struct DiskConfig<'a> {
pub path: &'a Path,
}
impl<'a> DiskConfig<'a> {
pub fn parse(disk: &'a str) -> Result<Self> {
Ok(DiskConfig {
path: Path::new(disk),
})
}
}
pub struct NetConfig<'a> {
pub tap: Option<&'a str>,
pub ip: Ipv4Addr,
pub mask: Ipv4Addr,
pub mac: MacAddr,
}
impl<'a> NetConfig<'a> {
pub fn parse(net: Option<&'a str>) -> Result<Option<Self>> {
if net.is_none() {
return Ok(None);
}
// Split the parameters based on the comma delimiter
let params_list: Vec<&str> = net.unwrap().split(',').collect();
let mut tap_str: &str = "";
let mut ip_str: &str = "";
let mut mask_str: &str = "";
let mut mac_str: &str = "";
for param in params_list.iter() {
if param.starts_with("tap=") {
tap_str = &param[4..];
} else if param.starts_with("ip=") {
ip_str = &param[3..];
} else if param.starts_with("mask=") {
mask_str = &param[5..];
} else if param.starts_with("mac=") {
mac_str = &param[4..];
}
}
let mut tap: Option<&str> = None;
let mut ip: Ipv4Addr = Ipv4Addr::new(192, 168, 249, 1);
let mut mask: Ipv4Addr = Ipv4Addr::new(255, 255, 255, 0);;
let mut mac: MacAddr = MacAddr::local_random();
if !tap_str.is_empty() {
tap = Some(tap_str);
}
if !ip_str.is_empty() {
ip = ip_str.parse().map_err(Error::ParseNetIpParam)?;
}
if !mask_str.is_empty() {
mask = mask_str.parse().map_err(Error::ParseNetMaskParam)?;
}
if !mac_str.is_empty() {
mac = MacAddr::parse_str(mac_str).map_err(Error::ParseNetMacParam)?;
}
Ok(Some(NetConfig { tap, ip, mask, mac }))
}
}
pub struct RngConfig<'a> {
pub src: &'a Path,
}
impl<'a> RngConfig<'a> {
pub fn parse(rng: &'a str) -> Result<Self> {
Ok(RngConfig {
src: Path::new(rng),
})
}
}
#[derive(Debug)]
pub struct FsConfig<'a> {
pub tag: &'a str,
pub sock: &'a Path,
pub num_queues: usize,
pub queue_size: u16,
}
impl<'a> FsConfig<'a> {
pub fn parse(fs: &'a str) -> Result<Self> {
// Split the parameters based on the comma delimiter
let params_list: Vec<&str> = fs.split(',').collect();
let mut tag: &str = "";
let mut sock: &str = "";
let mut num_queues_str: &str = "";
let mut queue_size_str: &str = "";
for param in params_list.iter() {
if param.starts_with("tag=") {
tag = &param[4..];
} else if param.starts_with("sock=") {
sock = &param[5..];
} else if param.starts_with("num_queues=") {
num_queues_str = &param[11..];
} else if param.starts_with("queue_size=") {
queue_size_str = &param[11..];
}
}
let mut num_queues: usize = 1;
let mut queue_size: u16 = 1024;
if tag.is_empty() {
return Err(Error::ParseFsTagParam);
}
if sock.is_empty() {
return Err(Error::ParseFsSockParam);
}
if !num_queues_str.is_empty() {
num_queues = num_queues_str
.parse()
.map_err(Error::ParseFsNumQueuesParam)?;
}
if !queue_size_str.is_empty() {
queue_size = queue_size_str
.parse()
.map_err(Error::ParseFsQueueSizeParam)?;
}
Ok(FsConfig {
tag,
sock: Path::new(sock),
num_queues,
queue_size,
})
}
}
pub struct PmemConfig<'a> {
pub file: &'a Path,
pub size: u64,
}
impl<'a> PmemConfig<'a> {
pub fn parse(pmem: &'a str) -> Result<Self> {
// Split the parameters based on the comma delimiter
let params_list: Vec<&str> = pmem.split(',').collect();
let mut file_str: &str = "";
let mut size_str: &str = "";
for param in params_list.iter() {
if param.starts_with("file=") {
file_str = &param[5..];
} else if param.starts_with("size=") {
size_str = &param[5..];
}
}
if file_str.is_empty() {
return Err(Error::ParsePmemFileParam);
}
Ok(PmemConfig {
file: Path::new(file_str),
size: parse_size(size_str)?,
})
}
}
pub struct VmConfig<'a> {
pub cpus: CpusConfig,
pub memory: MemoryConfig<'a>,
pub kernel: KernelConfig<'a>,
pub cmdline: CmdlineConfig,
pub disks: Vec<DiskConfig<'a>>,
pub net: Option<NetConfig<'a>>,
pub rng: RngConfig<'a>,
pub fs: Option<Vec<FsConfig<'a>>>,
pub pmem: Option<Vec<PmemConfig<'a>>>,
}
impl<'a> VmConfig<'a> {
pub fn parse(vm_params: VmParams<'a>) -> Result<Self> {
let mut disks: Vec<DiskConfig> = Vec::new();
for disk in vm_params.disks.iter() {
disks.push(DiskConfig::parse(disk)?);
}
let mut fs: Option<Vec<FsConfig>> = None;
if let Some(fs_list) = &vm_params.fs {
let mut fs_config_list = Vec::new();
for item in fs_list.iter() {
fs_config_list.push(FsConfig::parse(item)?);
}
fs = Some(fs_config_list);
}
let mut pmem: Option<Vec<PmemConfig>> = None;
if let Some(pmem_list) = &vm_params.pmem {
let mut pmem_config_list = Vec::new();
for item in pmem_list.iter() {
pmem_config_list.push(PmemConfig::parse(item)?);
}
pmem = Some(pmem_config_list);
}
Ok(VmConfig {
cpus: CpusConfig::parse(vm_params.cpus)?,
memory: MemoryConfig::parse(vm_params.memory)?,
kernel: KernelConfig::parse(vm_params.kernel)?,
cmdline: CmdlineConfig::parse(vm_params.cmdline)?,
disks,
net: NetConfig::parse(vm_params.net)?,
rng: RngConfig::parse(vm_params.rng)?,
fs,
pmem,
})
}
}