Dylan Reid d5179a73c2 vmm: use 64-bit BARs for hotplugged virtio block devices ...

Boot-time block devices on PCI segment 0 use 32-bit BARs so early
firmware can access them without additional identity mapping in the
firmware page tables. However, hot-plugged block devices are only ever
seen by the OS kernel which handles 64-bit BARs natively.

Switch hot-plugged block devices to 64-bit BARs to avoid exhausting the
scarce 32-bit MMIO window (typically 2-3 GB between RAM and 4 GB) when
many devices are hot-plugged.

Extract the BAR sizing decision into use_64bit_bar_for_virtio_device()
and thread an is_hotplug flag through add_virtio_pci_device(). Add unit
tests covering all relevant combinations.

Signed-off-by: Dylan Reid <dgreid@fb.com>

2026-04-17 12:28:55 +00:00

..

src

vmm: use 64-bit BARs for hotplugged virtio block devices

2026-04-17 12:28:55 +00:00

build.rs

build: Add "fuzzing" as a valid cfg(..) attribute

2024-05-08 08:10:28 +00:00

Cargo.toml

hypervisor, vmm: pass SNP guest policy to sev_snp_init

2026-04-17 12:28:55 +00:00