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

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Date:   Wed, 6 Jan 2021 11:23:39 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Leon Romanovsky <leon@...nel.org>
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 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.

Jason