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pci: vfio: VFIO_IOMMU_MAP_DMA mmio regions

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For all VFIO devices, map all non-emulated MMIO regions to
the vfio container to allow PCIe P2P between all VFIO devices
on the virtual machine. This is required for a wide variety of
advanced GPU workloads such as GPUDirect P2P (DMA between two
GPUs), GPUDirect RDMA (DMA between a GPU and an IB device).

Signed-off-by: Thomas Barrett <tbarrett@crusoeenergy.com>
This commit is contained in:
Thomas Barrett 2024-01-23 03:21:45 +00:00 committed by Bo Chen
parent 56dbb8f0db
commit f0c1f8d079
1 changed files with 20 additions and 0 deletions
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20
pci/src/vfio.rs
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@ -1568,6 +1568,16 @@ impl VfioPciDevice {
self.vm
.create_user_memory_region(mem_region)
.map_err(VfioPciError::CreateUserMemoryRegion)?;
if !self.iommu_attached {
self.container
.vfio_dma_map(
user_memory_region.start,
user_memory_region.size,
user_memory_region.host_addr,
)
.map_err(VfioPciError::DmaMap)?;
}
}
}
}
@ -1578,6 +1588,16 @@ impl VfioPciDevice {
pub fn unmap_mmio_regions(&mut self) {
for region in self.common.mmio_regions.iter() {
for user_memory_region in region.user_memory_regions.iter() {
// Unmap from vfio container
if !self.iommu_attached {
if let Err(e) = self
.container
.vfio_dma_unmap(user_memory_region.start, user_memory_region.size)
{
error!("Could not unmap mmio region from vfio container: {}", e);
}
}
// Remove region
let r = self.vm.make_user_memory_region(
user_memory_region.slot,