On Tue, Feb 07, 2023 at 08:08:43PM +0800, Nanyong Sun wrote: > From: Rong Wang <wangrong68@xxxxxxxxxx> > > 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.. Also the iommu_group_has_isolated_msi() check is missing on the vdpa path, and it is missing the iommu ownership mechanism. Also which in-tree VDPA driver that uses the iommu runs on ARM? Please don't propose core changes for unmerged drivers. :( Jason
