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vmm: document move_bar allocator rollback paths

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Explanatory comments for the rollback paths in both PCI BAR
relocation branches.

Assisted-by: Claude (Anthropic)
Signed-off-by: CMGS <ilskdw@gmail.com>
This commit is contained in:
CMGS
2026-05-14 10:16:08 +08:00
committed by Rob Bradford
parent e65cca3bf5
commit 1ad9920713
1 changed files with 6 additions and 1 deletions
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7
vmm/src/device_manager.rs
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@@ -727,7 +727,9 @@ impl DeviceRelocation for AddressManager {
match region_type {
PciBarRegionType::IoRegion => {
let mut sys_allocator = self.allocator.lock().unwrap();
// Update system allocator
// Free old_base first so allocate(new_base) sees it as
// available; restore old_base on failure to keep the
// allocator in sync with the PIO bus.
sys_allocator.free_io_addresses(GuestAddress(old_base), len as GuestUsize);
if sys_allocator
.allocate_io_addresses(Some(GuestAddress(new_base)), len as GuestUsize, None)
@@ -767,6 +769,9 @@ impl DeviceRelocation for AddressManager {
if old_base >= pci_mmio_allocator.base().0
&& old_base <= pci_mmio_allocator.end().0
{
// Free old_base first so allocate(new_base) sees it
// as available; restore old_base on failure to keep
// the allocator in sync with the MMIO bus.
pci_mmio_allocator.free(GuestAddress(old_base), len as GuestUsize);
if pci_mmio_allocator
.allocate(Some(GuestAddress(new_base)), len as GuestUsize, Some(len))