On Wed, 10 Feb 2021 09:13:13 -0700, Jon Derrick wrote:
> The Intel Volume Management Device acts similar to a PCI-to-PCI bridge in that
> it changes downstream devices' requester-ids to its own. As VMD supports PCIe
> devices, it has its own MSI-X table and transmits child device MSI-X by
> remapping child device MSI-X and handling like a demultiplexer.
>
> Some newer VMD devices (Icelake Server) have an option to bypass the VMD MSI-X
> remapping table. This allows for better performance scaling as the child
> device
> MSI-X won't be limited by VMD's MSI-X count and IRQ handler.
>
> [...]
Applied to pci/vmd, thanks!
[1/2] iommu/vt-d: Use Real PCI DMA device for IRTE
https://git.kernel.org/lpieralisi/pci/c/9b4a824b88
[2/2] PCI: vmd: Disable MSI-X remapping when possible
https://git.kernel.org/lpieralisi/pci/c/ee81ee84f8
Thanks,
Lorenzo
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