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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
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