https://nalar.dev/tags/pasid/ Recent content in PASID on Nalar Hugo en-us Sat, 19 Sep 2026 00:00:00 +0000 https://nalar.dev/pcie-pasid-lets-one-device-carry-multiple-address-space-contexts/ Sat, 19 Sep 2026 00:00:00 +0000 https://nalar.dev/pcie-pasid-lets-one-device-carry-multiple-address-space-contexts/ <h1 id="pcie-pasid-lets-one-device-carry-multiple-address-space-contexts">PCIe PASID Lets One Device Carry Multiple Address-Space Contexts</h1> <p>A PCIe function normally has a Requester ID derived from its bus, device, and function identity. That identifier tells platform components which function issued a transaction, but it is too coarse when one device serves work from several process address spaces at the same time.</p> <p>Process Address Space ID (PASID) adds another identity field to the transaction path. A PASID can select an address-space context beneath the same device function, allowing the IOMMU to distinguish memory traffic that belongs to different processes without requiring a separate PCIe function for each one.</p>