linux-kernel - Re: [PATCH v4 06/17] PCI: add SIOV and IMS capability detection

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Date:   Fri, 13 Nov 2020 08:57:41 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>
CC:     Thomas Gleixner <tglx@...utronix.de>,
        "Wilk, Konrad" <konrad.wilk@...cle.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "Bjorn Helgaas" <helgaas@...nel.org>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "Dey, Megha" <megha.dey@...el.com>,
        "maz@...nel.org" <maz@...nel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>, "Lu, Baolu" <baolu.lu@...el.com>,
        "Kumar, Sanjay K" <sanjay.k.kumar@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "kwankhede@...dia.com" <kwankhede@...dia.com>,
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        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "Ortiz, Samuel" <samuel.ortiz@...el.com>,
        "Hossain, Mona" <mona.hossain@...el.com>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: [PATCH v4 06/17] PCI: add SIOV and IMS capability detection

On Fri, Nov 13, 2020 at 02:42:02AM +0000, Tian, Kevin wrote:

> CPUID#1_ECX is a x86 thing. Do we need to figure out probably_on_
> bare_metal for every architecture altogether, or is it OK to just
> handle it for x86 arch at this stage? Based on previous discussions 
> ims is just one piece of multiple technologies to enable SIOV-like
> scalability. Ideally arch-specific enablement beyond ims (e.g. the 
> IOMMU part) will be required for such scaled usage thus we 
> may just leave ims disabled for non-x86 and wait until that time to 
> figure out arch specific probably_on_bare_metal?

At the very least you need to ensure that
pci_subdevice_msi_create_irq_domain() fails entirely on other
architectures until they can sort out these sorts of issues..

Jason