Re: [patch 3/8] PCI/MSI: Enforce that MSI-X table entry is masked for update

[Bjorn Helgaas]

On Wed, Jul 21, 2021 at 09:11:29PM +0200, Thomas Gleixner wrote:
> The specification states:

Maybe add "(PCIe r5.0, sec 6.1.4.5)"

>     For MSI-X, a function is permitted to cache Address and Data values
>     from unmasked MSI-X Table entries. However, anytime software unmasks a
>     currently masked MSI-X Table entry either by clearing its Mask bit or
>     by clearing the Function Mask bit, the function must update any Address
>     or Data values that it cached from that entry. If software changes the
>     Address or Data value of an entry while the entry is unmasked, the
>     result is undefined.