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vm-allocator: Introduce an MMIO hole address allocator

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With this new AddressAllocator as part of the SystemAllocator, the
VMM can now decide with finer granularity where to place memory.

By allocating the RAM and the hole into the MMIO address space, we
ensure that no memory will be allocated by accident where the RAM or
where the hole is.
And by creating the new MMIO hole address space, we create a subset
of the entire MMIO address space where we can place 32 bits BARs for
example.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf
2019-07-17 09:54:11 -07:00
parent a761b820c7
commit f98a69f42e
5 changed files with 133 additions and 16 deletions
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4
arch/src/aarch64/mod.rs
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@@ -6,8 +6,8 @@ pub mod layout;
use memory_model::{GuestAddress, GuestMemory};
/// Stub function that needs to be implemented when aarch64 functionality is added.
pub fn arch_memory_regions(size: usize) -> Vec<(GuestAddress, usize)> {
vec![(GuestAddress(0), size)]
pub fn arch_memory_regions(size: usize) -> Vec<(GuestAddress, usize, RegionType)> {
vec![(GuestAddress(0), size, RegionType::Ram)]
}
/// Stub function that needs to be implemented when aarch64 functionality is added.