linux-kernel - Re: [patch V2 00/46] x86, PCI, XEN, genirq ...: Prepare for device MSI

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Message-ID: <20200828114131.GA13881@8bytes.org>
Date:   Fri, 28 Aug 2020 13:41:31 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        iommu@...ts.linux-foundation.org, linux-hyperv@...r.kernel.org,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Jon Derrick <jonathan.derrick@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Wei Liu <wei.liu@...nel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Steve Wahl <steve.wahl@....com>,
        Dimitri Sivanich <sivanich@....com>,
        Russ Anderson <rja@....com>, linux-pci@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        xen-devel@...ts.xenproject.org, Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Megha Dey <megha.dey@...el.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jacob Pan <jacob.jun.pan@...el.com>,
        Baolu Lu <baolu.lu@...el.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Dan Williams <dan.j.williams@...el.com>
Subject: Re: [patch V2 00/46] x86, PCI, XEN, genirq ...: Prepare for device
 MSI

On Wed, Aug 26, 2020 at 01:16:28PM +0200, Thomas Gleixner wrote:
> This is the second version of providing a base to support device MSI (non
> PCI based) and on top of that support for IMS (Interrupt Message Storm)
> based devices in a halfways architecture independent way.
> 
> The first version can be found here:
> 
>     https://lore.kernel.org/r/20200821002424.119492231@linutronix.de
> 
> It's still a mixed bag of bug fixes, cleanups and general improvements
> which are worthwhile independent of device MSI.
> 
> There are quite a bunch of issues to solve:
> 
>   - X86 does not use the device::msi_domain pointer for historical reasons
>     and due to XEN, which makes it impossible to create an architecture
>     agnostic device MSI infrastructure.
> 
>   - X86 has it's own msi_alloc_info data type which is pointlessly
>     different from the generic version and does not allow to share code.
> 
>   - The logic of composing MSI messages in an hierarchy is busted at the
>     core level and of course some (x86) drivers depend on that.
> 
>   - A few minor shortcomings as usual
> 
> This series addresses that in several steps:

For all IOMMU changes:

	Acked-by: Joerg Roedel <jroedel@...e.de>