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Date: Mon, 16 Nov 2020 11:46:35 -0400 From: Jason Gunthorpe <jgg@...dia.com> To: "Tian, Kevin" <kevin.tian@...el.com> CC: "Raj, Ashok" <ashok.raj@...el.com>, Thomas Gleixner <tglx@...utronix.de>, Christoph Hellwig <hch@...radead.org>, "Wilk, Konrad" <konrad.wilk@...cle.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>, "eric.auger@...hat.com" <eric.auger@...hat.com>, "parav@...lanox.com" <parav@...lanox.com>, "rafael@...nel.org" <rafael@...nel.org>, "netanelg@...lanox.com" <netanelg@...lanox.com>, "shahafs@...lanox.com" <shahafs@...lanox.com>, "yan.y.zhao@...ux.intel.com" <yan.y.zhao@...ux.intel.com>, "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 Mon, Nov 16, 2020 at 07:31:49AM +0000, Tian, Kevin wrote: > > The subdevices require PASID & IOMMU in native, but inside the guest there > > is no > > need for IOMMU unless you want to build SVM on top. subdevices work > > without > > any vIOMMU or hypercall in the guest. Only because they look like normal > > PCI devices we could map interrupts to legacy MSIx. > > Guest managed subdevices on PF/VF requires vIOMMU. Why? I've never heard we need vIOMMU for our existing SRIOV flows in VMs?? Jason
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