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MSISupported registry key on a PCI/PCIe device that does not support MSI RRS feed

  • Question

  • https://docs.microsoft.com/en-us/windows-hardware/drivers/kernel/enabling-message-signaled-interrupts-in-the-registry

    Received a question from a PCI Express card vendor on the above information.

    Vendor would like to implement the above in their add-in card INF file but are concerned about what may happen if their card is plugged into a PCI Express root port that does not support MSI.

    Is it "no harm" to enable MSI via registry on a device that does not support MSI in it's PCI configuration space?

    Thursday, November 15, 2018 6:33 PM

Answers

  • If the card supports MSI at all then it is safe to enable this.   Windows can still turn it back into a regular interrupt depending on resources or hardware.


    Don Burn Windows Driver Consulting Website: http://www.windrvr.com

    • Marked as answer by Toby Zimmerman Friday, November 16, 2018 12:32 AM
    Thursday, November 15, 2018 8:59 PM