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pci: vfio: Restore BARs at expected addresses

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Relying on the list of resources, VfioCommon is now able to allocate the
BARs at specific addresses. This will be useful for restoring VFIO and
vfio-user devices.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2022-04-07 14:56:03 +02:00
parent 0c34846ef6
commit 6175cc0977
1 changed files with 17 additions and 4 deletions
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21
pci/src/vfio.rs
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@ -363,7 +363,7 @@ impl VfioCommon {
allocator: &Arc<Mutex<SystemAllocator>>,
mmio_allocator: &mut AddressAllocator,
vfio_wrapper: &dyn Vfio,
_resources: Option<Vec<Resource>>,
resources: Option<Vec<Resource>>,
) -> Result<Vec<(GuestAddress, GuestUsize, PciBarRegionType)>, PciDeviceError> {
let mut ranges = Vec::new();
let mut bar_id = VFIO_PCI_BAR0_REGION_INDEX as u32;
@ -376,6 +376,19 @@ impl VfioCommon {
let region_size: u64;
let bar_addr: GuestAddress;
let restored_bar_addr = if let Some(resources) = &resources {
match resources
.get(ranges.len())
.ok_or(PciDeviceError::MissingResource)?
{
Resource::MmioAddressRange { base, .. } => Some(GuestAddress(*base)),
Resource::PioAddressRange { base, .. } => Some(GuestAddress(*base as u64)),
_ => return Err(PciDeviceError::InvalidResourceType),
}
} else {
None
};
let bar_offset = if bar_id == VFIO_PCI_ROM_REGION_INDEX {
(PCI_ROM_EXP_BAR_INDEX * 4) as u32
} else {
@ -433,7 +446,7 @@ impl VfioCommon {
bar_addr = allocator
.lock()
.unwrap()
.allocate_io_addresses(None, region_size, Some(0x4))
.allocate_io_addresses(restored_bar_addr, region_size, Some(0x4))
.ok_or(PciDeviceError::IoAllocationFailed(region_size))?;
}
#[cfg(target_arch = "aarch64")]
@ -463,7 +476,7 @@ impl VfioCommon {
// BAR allocation must be naturally aligned
bar_addr = mmio_allocator
.allocate(None, region_size, Some(region_size))
.allocate(restored_bar_addr, region_size, Some(region_size))
.ok_or(PciDeviceError::IoAllocationFailed(region_size))?;
} else {
// Mask out flag bits (lowest 4 for memory bars)
@ -481,7 +494,7 @@ impl VfioCommon {
bar_addr = allocator
.lock()
.unwrap()
.allocate_mmio_hole_addresses(None, region_size, Some(region_size))
.allocate_mmio_hole_addresses(restored_bar_addr, region_size, Some(region_size))
.ok_or(PciDeviceError::IoAllocationFailed(region_size))?;
}