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

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Date:   Thu, 7 Jan 2021 09:55:02 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Leon Romanovsky <leon@...nel.org>, Jason Gunthorpe <jgg@...dia.com>
Cc:     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 1/7/21 12:01 AM, Leon Romanovsky wrote:
> 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?

All these (hypercall detect and invoke) will be done in
pci_subdevice_msi_create_irq_domain(). It will be transparent to the
callers.

> Will such patch be taken to stable@...stros?

It will not be taken to stable. For distros, it depends. They can
backport if they want to support the feature.

Best regards,
baolu