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Message-ID: <CACGkMEtehykvqNUnfCi0VmHR1xpmhj4sSWdYW1-0oATY=0YhXw@mail.gmail.com> Date: Fri, 17 Feb 2023 13:35:59 +0800 From: Jason Wang <jasowang@...hat.com> To: Jason Gunthorpe <jgg@...dia.com> Cc: Nanyong Sun <sunnanyong@...wei.com>, joro@...tes.org, will@...nel.org, robin.murphy@....com, mst@...hat.com, iommu@...ts.linux.dev, linux-kernel@...r.kernel.org, kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org, wangrong68@...wei.com Subject: Re: [PATCH v2] vhost/vdpa: Add MSI translation tables to iommu for software-managed MSI On Fri, Feb 17, 2023 at 8:15 AM Jason Gunthorpe <jgg@...dia.com> wrote: > > On Tue, Feb 07, 2023 at 08:08:43PM +0800, Nanyong Sun wrote: > > From: Rong Wang <wangrong68@...wei.com> > > > > Once enable iommu domain for one device, the MSI > > translation tables have to be there for software-managed MSI. > > Otherwise, platform with software-managed MSI without an > > irq bypass function, can not get a correct memory write event > > from pcie, will not get irqs. > > The solution is to obtain the MSI phy base address from > > iommu reserved region, and set it to iommu MSI cookie, > > then translation tables will be created while request irq. > > Probably not what anyone wants to hear, but I would prefer we not add > more uses of this stuff. It looks like we have to get rid of > iommu_get_msi_cookie() :\ > > I'd like it if vdpa could move to iommufd not keep copying stuff from > it.. Yes, but we probably need a patch for -stable. > > Also the iommu_group_has_isolated_msi() check is missing on the vdpa > path, and it is missing the iommu ownership mechanism. Ok. > > Also which in-tree VDPA driver that uses the iommu runs on ARM? Please ifcvf and vp_vpda are two drivers that use platform IOMMU. Thanks > don't propose core changes for unmerged drivers. :( > > Jason >
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