linux-kernel - Re: [RFC PATCH v2 1/1] platform-msi: Add platform check for subdevice irq domain

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Message-ID: <20210106160158.GX31158@unreal>
Date:   Wed, 6 Jan 2021 18:01:58 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Jason Gunthorpe <jgg@...dia.com>
Cc:     Lu Baolu <baolu.lu@...ux.intel.com>, tglx@...utronix.de,
        ashok.raj@...el.com, kevin.tian@...el.com, dave.jiang@...el.com,
        megha.dey@...el.com, dwmw2@...radead.org,
        alex.williamson@...hat.com, bhelgaas@...gle.com,
        dan.j.williams@...el.com, dmaengine@...r.kernel.org,
        eric.auger@...hat.com, jacob.jun.pan@...el.com,
        kvm@...r.kernel.org, kwankhede@...dia.com,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        maz@...nel.org, mona.hossain@...el.com, netanelg@...lanox.com,
        parav@...lanox.com, pbonzini@...hat.com, rafael@...nel.org,
        samuel.ortiz@...el.com, sanjay.k.kumar@...el.com,
        shahafs@...lanox.com, tony.luck@...el.com, vkoul@...nel.org,
        yan.y.zhao@...ux.intel.com, yi.l.liu@...el.com
Subject: Re: [RFC PATCH v2 1/1] platform-msi: Add platform check for
 subdevice irq domain

On Wed, Jan 06, 2021 at 11:23:39AM -0400, Jason Gunthorpe wrote:
> On Wed, Jan 06, 2021 at 12:40:17PM +0200, Leon Romanovsky wrote:
>
> > I asked what will you do when QEMU will gain needed functionality?
> > Will you remove QEMU from this list? If yes, how such "new" kernel will
> > work on old QEMU versions?
>
> The needed functionality is some VMM hypercall, so presumably new
> kernels that support calling this hypercall will be able to discover
> if the VMM hypercall exists and if so superceed this entire check.

Let's not speculate, do we have well-known path?
Will such patch be taken to stable@...stros?

Thanks

>
> Jason