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// Copyright 2020 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
use std::fmt::{self, Display};
use std::fs::OpenOptions;
use std::io;
use crate::Pstore;
use kvm::Vm;
use resources::SystemAllocator;
use resources::{Alloc, MmioType};
use sys_util::{GuestAddress, MemoryMapping};
/// Error for pstore.
#[derive(Debug)]
pub enum Error {
IoError(io::Error),
MmapError(sys_util::MmapError),
ResourcesError(resources::Error),
SysUtilError(sys_util::Error),
}
impl Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use self::Error::*;
match self {
IoError(e) => write!(f, "failed to create pstore backend file: {}", e),
MmapError(e) => write!(f, "failed to get file mapped address: {}", e),
ResourcesError(e) => write!(f, "failed to allocate pstore region: {}", e),
SysUtilError(e) => write!(f, "file to add pstore region to mmio: {}", e),
}
}
}
impl std::error::Error for Error {}
type Result<T> = std::result::Result<T, Error>;
pub struct RamoopsRegion {
pub address: u64,
pub size: u32,
}
/// Creates a mmio memory region for pstore.
pub fn create_memory_region(
vm: &mut Vm,
resources: &mut SystemAllocator,
pstore: &Pstore,
) -> Result<RamoopsRegion> {
let file = OpenOptions::new()
.read(true)
.write(true)
.create(true)
.open(&pstore.path)
.map_err(Error::IoError)?;
file.set_len(pstore.size as u64).map_err(Error::IoError)?;
let address = resources
.mmio_allocator(MmioType::High)
.allocate(pstore.size as u64, Alloc::Pstore, "pstore".to_owned())
.map_err(Error::ResourcesError)?;
let memory_mapping =
MemoryMapping::from_fd(&file, pstore.size as usize).map_err(Error::MmapError)?;
vm.add_memory_region(
GuestAddress(address),
Box::new(memory_mapping),
false,
false,
)
.map_err(Error::SysUtilError)?;
Ok(RamoopsRegion {
address,
size: pstore.size,
})
}
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