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vmm: memory_manager: Extract code for allocating new memory

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This function can then be used by the TDX code to allocate the memory at
specific locations required for the TDVF to run from.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2021-02-15 14:00:27 +00:00 committed by Samuel Ortiz
parent 6e4c90f305
commit 38c41a5074
1 changed files with 31 additions and 21 deletions
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52
vmm/src/memory_manager.rs
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@ -1093,25 +1093,11 @@ impl MemoryManager {
Ok(start_addr)
}
fn hotplug_ram_region(&mut self, size: usize) -> Result<Arc<GuestRegionMmap>, Error> {
info!("Hotplugging new RAM: {}", size);
// Check that there is a free slot
if self.next_hotplug_slot >= HOTPLUG_COUNT {
return Err(Error::NoSlotAvailable);
}
// "Inserted" DIMM must have a size that is a multiple of 128MiB
if size % (128 << 20) != 0 {
return Err(Error::InvalidSize);
}
let start_addr = MemoryManager::start_addr(self.guest_memory.memory().last_addr(), true)?;
if start_addr.checked_add(size.try_into().unwrap()).unwrap() > self.start_of_device_area() {
return Err(Error::InsufficientHotplugRAM);
}
pub fn add_ram_region(
&mut self,
start_addr: GuestAddress,
size: usize,
) -> Result<Arc<GuestRegionMmap>, Error> {
// Allocate memory for the region
let region = MemoryManager::create_ram_region(
&None,
@ -1140,6 +1126,32 @@ impl MemoryManager {
slot,
});
self.add_region(Arc::clone(&region))?;
Ok(region)
}
fn hotplug_ram_region(&mut self, size: usize) -> Result<Arc<GuestRegionMmap>, Error> {
info!("Hotplugging new RAM: {}", size);
// Check that there is a free slot
if self.next_hotplug_slot >= HOTPLUG_COUNT {
return Err(Error::NoSlotAvailable);
}
// "Inserted" DIMM must have a size that is a multiple of 128MiB
if size % (128 << 20) != 0 {
return Err(Error::InvalidSize);
}
let start_addr = MemoryManager::start_addr(self.guest_memory.memory().last_addr(), true)?;
if start_addr.checked_add(size.try_into().unwrap()).unwrap() > self.start_of_device_area() {
return Err(Error::InsufficientHotplugRAM);
}
let region = self.add_ram_region(start_addr, size)?;
// Tell the allocator
self.allocator
.lock()
@ -1156,8 +1168,6 @@ impl MemoryManager {
self.next_hotplug_slot += 1;
self.add_region(Arc::clone(&region))?;
Ok(region)
}