CMGS e38c5c4340 pci: rollback BAR address on failed move_bar ...

When BAR reprogramming is detected, detect_bar_reprogramming()
eagerly updates the BAR address in config space before the actual
MMIO remapping occurs. If the subsequent move_bar() fails (e.g.
the new address falls outside the allocator range), the config
register retains the new address while the MMIO bus still uses
the old one, leaving the device broken.

Add restore_bar_addr() to undo the config space update when
move_bar() fails, so the device remains functional at its
original address.

For 64-bit BARs, restore both the low and high BAR slots as well
as the corresponding config registers, mirroring the two-slot
update logic in detect_bar_reprogramming().

Implement restore_bar_addr() for all PciDevice implementations
(VirtioPciDevice, VfioPciDevice, VfioUserPciDevice, IvshmemDevice,
PvPanicDevice, and PvmemcontrolPciDevice) by delegating to their
respective PciConfiguration::restore_bar_addr().

Signed-off-by: CMGS <ilskdw@gmail.com>

2026-04-13 10:25:18 +00:00

..

src

pci: rollback BAR address on failed move_bar

2026-04-13 10:25:18 +00:00

Cargo.toml

build(deps): bump the non-rust-vmm group across 2 directories with 7 updates

2026-03-31 01:15:56 +00:00