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

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Message-ID: <20210722214656.GA350054@bjorn-Precision-5520>
Date:   Thu, 22 Jul 2021 16:46:56 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Marc Zyngier <maz@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        x86@...nel.org
Subject: Re: [patch 3/8] PCI/MSI: Enforce that MSI-X table entry is masked
 for update

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.