linux-kernel - Re: revert bab65e48cb064 PCI/MSI Sanitize MSI-X checks

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Date:   Thu, 06 Apr 2023 23:06:53 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        David Laight <David.Laight@...lab.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: revert bab65e48cb064 PCI/MSI Sanitize MSI-X checks

On Thu, Apr 06 2023 at 12:35, Linus Torvalds wrote:
>> Previously it returned 8.
>
> Does just moving the pci_msix_validate_entries() down to below the
> hwsize update code fix it?
>
> IOW, something like this attached patch?
>
> ENTIRELY UNTESTED! This may be seriously broken for some reason, but
> it does seem like the current code makes no sense (that "Keep the IRQ
> virtual hackery working" comment seems to not possibly be true since
> the MSIX nvec has effectively been checked against hwsize by the
> pci_msix_validate_entries() code before).

Yes, that works too. But I rather remove the hwsize check from the
validation function as I explained in my earlier reply to Bjorn in that
thread.

Thanks,

        tglx