External/cloud-hypervisor
1
0
Fork 0
mirror of https://github.com/cloud-hypervisor/cloud-hypervisor.git synced 2024-07-02 16:02:37 +00:00
Code Issues Packages Projects Releases Wiki Activity

vmm: memory: Add Copy-on-Write parameter when creating region

Browse Source 
Now that we can choose specific mmap flags for the guest RAM, we create
a new parameter "copy_on_write" meaning that the memory mappings backed
by a file should be performed with MAP_PRIVATE instead of MAP_SHARED.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2020-04-07 10:56:29 +02:00
parent be4e1e8712
commit ee5a041a0f
1 changed files with 9 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
vmm/src/memory_manager.rs
View File

@ -237,6 +237,7 @@ impl MemoryManager {
&config.file,
region.0,
region.1,
false,
)?);
}
@ -263,6 +264,7 @@ impl MemoryManager {
&config.file,
start_addr,
size as usize,
false,
)?);
virtiomem_resize = Some(vm_virtio::Resize::new().map_err(Error::EventFdFail)?);
@ -415,6 +417,7 @@ impl MemoryManager {
backing_file: &Option<PathBuf>,
start_addr: GuestAddress,
size: usize,
copy_on_write: bool,
) -> Result<Arc<GuestRegionMmap>, Error> {
Ok(Arc::new(match backing_file {
Some(ref file) => {
@ -436,7 +439,11 @@ impl MemoryManager {
f.set_len(size as u64).map_err(Error::SharedFileSetLen)?;
let mmap_flags = libc::MAP_NORESERVE | libc::MAP_SHARED;
let mmap_flags = if copy_on_write {
libc::MAP_NORESERVE | libc::MAP_PRIVATE
} else {
libc::MAP_NORESERVE | libc::MAP_SHARED
};
GuestRegionMmap::new(
MmapRegion::build(
Some(FileOffset::new(f, 0)),
@ -497,7 +504,7 @@ impl MemoryManager {
}
// Allocate memory for the region
let region = MemoryManager::create_ram_region(&self.backing_file, start_addr, size)?;
let region = MemoryManager::create_ram_region(&self.backing_file, start_addr, size, false)?;
// Map it into the guest
self.create_userspace_mapping(