linux-kernel - Re: [patch 36/39] PCI/MSI: Validate MSIX contiguous restriction early

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Date:   Wed, 16 Nov 2022 14:00:27 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Marc Zyngier <maz@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dave Jiang <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Ashok Raj <ashok.raj@...el.com>, Jon Mason <jdmason@...zu.us>,
        Allen Hubbe <allenbh@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        linuxppc-dev@...ts.ozlabs.org,
        "Ahmed S. Darwish" <darwi@...utronix.de>,
        Reinette Chatre <reinette.chatre@...el.com>
Subject: Re: [patch 36/39] PCI/MSI: Validate MSIX contiguous restriction early

On Fri, Nov 11, 2022 at 02:55:12PM +0100, Thomas Gleixner wrote:
> With interrupt domains the sanity check for MSI-X vector validation can be
> done _before_ any allocation happens. The sanity check only applies to the
> allocation functions which have an 'entries' array argument. The entries
> array is filled by the caller with the requested MSI-X indicies. Some drivers
> have gaps in the index space which is not supported on all architectures.
> 
> The PCI/MSI irqdomain has a 'feature' bit to enforce this validation late
> during the allocation phase.
> 
> Just do it right away before doing any other work along with the other
> sanity checks on that array.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
>  drivers/pci/msi/msi.c |   11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason