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vmm: memory_manager: Refactor GuestMemoryMmap construction

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Make the GuestMemoryMmap from a Vec<Arc<GuestRegionMmap>> by using this
method we can persist a set of regions in the MemoryManager and then
extend this set with a newly created region. Ultimately that will allow
the hotplug of memory.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2019-12-31 11:58:07 +00:00 committed by Samuel Ortiz
parent 281b99af0a
commit 1af11a7c92
1 changed files with 38 additions and 27 deletions
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65
vmm/src/memory_manager.rs
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@ -15,8 +15,8 @@ use std::sync::{Arc, Mutex};
use vm_allocator::SystemAllocator;
use vm_memory::guest_memory::FileOffset;
use vm_memory::{
Address, Error as MmapError, GuestAddress, GuestMemory, GuestMemoryMmap, GuestMemoryRegion,
GuestUsize,
mmap::MmapRegionError, Address, Error as MmapError, GuestAddress, GuestMemory, GuestMemoryMmap,
GuestMemoryRegion, GuestRegionMmap, GuestUsize, MmapRegion,
};
pub struct MemoryManager {
@ -40,6 +40,12 @@ pub enum Error {
/// Failed to allocate a memory range.
MemoryRangeAllocation,
/// Failed to create map region
MmapRegion(),
/// Error from region creation
GuestMemoryRegion(MmapRegionError),
}
pub fn get_host_cpu_phys_bits() -> u8 {
@ -87,41 +93,46 @@ impl MemoryManager {
.map(|r| (r.0, r.1))
.collect();
let guest_memory = match backing_file {
Some(ref file) => {
let mut mem_regions = Vec::<(GuestAddress, usize, Option<FileOffset>)>::new();
for region in ram_regions.iter() {
if file.is_file() {
let file = OpenOptions::new()
.read(true)
.write(true)
.open(file)
.map_err(Error::SharedFileCreate)?;
file.set_len(region.1 as u64)
.map_err(Error::SharedFileSetLen)?;
mem_regions.push((region.0, region.1, Some(FileOffset::new(file, 0))));
} else if file.is_dir() {
let mut mem_regions = Vec::new();
for region in ram_regions.iter() {
mem_regions.push(Arc::new(match backing_file {
Some(ref file) => {
let f = if file.is_dir() {
let fs_str = format!("{}{}", file.display(), "/tmpfile_XXXXXX");
let fs = std::ffi::CString::new(fs_str).unwrap();
let mut path = fs.as_bytes_with_nul().to_owned();
let path_ptr = path.as_mut_ptr() as *mut _;
let fd = unsafe { libc::mkstemp(path_ptr) };
unsafe { libc::unlink(path_ptr) };
unsafe { File::from_raw_fd(fd) }
} else {
OpenOptions::new()
.read(true)
.write(true)
.open(file)
.map_err(Error::SharedFileCreate)?
};
let f = unsafe { File::from_raw_fd(fd) };
f.set_len(region.1 as u64)
.map_err(Error::SharedFileSetLen)?;
f.set_len(region.1 as u64)
.map_err(Error::SharedFileSetLen)?;
mem_regions.push((region.0, region.1, Some(FileOffset::new(f, 0))));
}
GuestRegionMmap::new(
MmapRegion::from_file(FileOffset::new(f, 0), region.1)
.map_err(Error::GuestMemoryRegion)?,
region.0,
)
.map_err(Error::GuestMemory)?
}
None => GuestRegionMmap::new(
MmapRegion::new(region.1).map_err(Error::GuestMemoryRegion)?,
region.0,
)
.map_err(Error::GuestMemory)?,
}))
}
GuestMemoryMmap::with_files(&mem_regions).map_err(Error::GuestMemory)?
}
None => GuestMemoryMmap::new(&ram_regions).map_err(Error::GuestMemory)?,
};
let guest_memory =
GuestMemoryMmap::from_arc_regions(mem_regions).map_err(Error::GuestMemory)?;
let end_of_device_area = GuestAddress((1 << get_host_cpu_phys_bits()) - 1);
let mem_end = guest_memory.end_addr();