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SR-IOV

Created: Apr 30, 2022 22:44:21Latest reply: Apr 30, 2022 23:15:32 146 1 0 0 0
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What is SR-IOV


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Featured Answers
wissal
MVE Created Apr 30, 2022 23:15:32

Hello,

The short answer is that SR-IOV is a specification that allows a PCIe device to appear to be multiple separate physical PCIe devices. The SR-IOV specification was created and is maintained by the PCI SIG, with the idea that a standard specification will help promote interoperability.

SR-IOV works by introducing the idea of physical functions (PFs) and virtual functions (VFs). Physical functions (PFs) are full-featured PCIe functions; virtual functions (VFs) are “lightweight” functions that lack configuration resources. (I’ll explain why VFs lack these configuration resources shortly.)

SR-IOV requires support in the BIOS as well as in the operating system instance or hypervisor that is running on the hardware. Until very recently, I had been under the impression that SR-IOV was handled solely in hardware and did not require any software support; unfortunately, I was mistaken. Software support in the operating system instance or hypervisor is definitely required. To understand why, I must talk a bit more about PFs and VFs.

Thanks
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All Answers
wissal
wissal MVE Created Apr 30, 2022 23:15:32

Hello,

The short answer is that SR-IOV is a specification that allows a PCIe device to appear to be multiple separate physical PCIe devices. The SR-IOV specification was created and is maintained by the PCI SIG, with the idea that a standard specification will help promote interoperability.

SR-IOV works by introducing the idea of physical functions (PFs) and virtual functions (VFs). Physical functions (PFs) are full-featured PCIe functions; virtual functions (VFs) are “lightweight” functions that lack configuration resources. (I’ll explain why VFs lack these configuration resources shortly.)

SR-IOV requires support in the BIOS as well as in the operating system instance or hypervisor that is running on the hardware. Until very recently, I had been under the impression that SR-IOV was handled solely in hardware and did not require any software support; unfortunately, I was mistaken. Software support in the operating system instance or hypervisor is definitely required. To understand why, I must talk a bit more about PFs and VFs.

Thanks
View more
  • x
  • convention:

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