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aarch64: Reserve a hole in 32-bit space

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The reserved space is for devices.
Some devices (like TPM) require arbitrary addresses close to 4GiB.

Signed-off-by: Michael Zhao <michael.zhao@arm.com>
This commit is contained in:
Michael Zhao
2022-03-30 10:22:26 +08:00
committed by Xin Wang
parent a3dbc3b415
commit 848d88c122
3 changed files with 54 additions and 16 deletions
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3
vmm/src/memory_manager.rs
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@@ -1327,7 +1327,7 @@ impl MemoryManager {
// If memory hotplug is allowed, the start address needs to be aligned
// (rounded-up) to 128MiB boundary.
// If memory hotplug is not allowed, there is no alignment required.
// On x86_64, it must also start at the 64bit start.
// And it must also start at the 64bit start.
fn start_addr(mem_end: GuestAddress, allow_mem_hotplug: bool) -> Result<GuestAddress, Error> {
let mut start_addr = if allow_mem_hotplug {
GuestAddress(mem_end.0 | ((128 << 20) - 1))
@@ -1339,7 +1339,6 @@ impl MemoryManager {
.checked_add(1)
.ok_or(Error::GuestAddressOverFlow)?;
#[cfg(target_arch = "x86_64")]
if mem_end < arch::layout::MEM_32BIT_RESERVED_START {
return Ok(arch::layout::RAM_64BIT_START);
}