Leander Kohler db93c6fdc7 pci: Save deferred BAR reprogramming state ...

OVMF can reprogram PCI BARs while memory space decoding is disabled.
Cloud Hypervisor defers the corresponding BAR move in
`pending_bar_reprogram` until the PCI command register enables Memory
Space again.

That deferred state was not part of `PciConfigurationState`. A
snapshot taken in that window restored the new BAR values in PCI
config space, but lost the pending BAR relocation needed to update the
VMM-side BAR mapping.

The restore logs show guest MMIO accesses to the reprogrammed BAR
addresses `0xc0000000`, `0x100000000`, and `0x100080000` hitting
unregistered addresses. The firmware serial output shows OVMF
assigning those same BAR addresses during PCI resource allocation,
then reaching BDS, finding the mass-storage device, and failing to
boot from it.

Serialize and restore `pending_bar_reprogram` so deferred BAR moves
survive snapshot and restore.

Co-authored-by: Thomas Prescher <thomas.prescher@cyberus-technology.de>
Co-authored-by: Julian Schindel <julian.schindel@cyberus-technology.de>
On-behalf-of: SAP leander.kohler@sap.com
Signed-off-by: Leander Kohler <leander.kohler@cyberus-technology.de>

2026-04-01 10:20:11 +00:00

..

src

pci: Save deferred BAR reprogramming state

2026-04-01 10:20:11 +00:00

Cargo.toml

misc: make MSRV workspace-wide for cloud-hypervisor dependencies

2026-03-13 01:30:25 +00:00