On Mon, Jun 16, 2025 at 10:20:31AM -0300, Jason Gunthorpe wrote: > On Sun, Jun 15, 2025 at 02:47:15PM -0400, Demi Marie Obenour wrote: > > > Is a paravirtualized IOMMU with interrupt remapping something that makes > > sense? > > IMHO linking interrupt remapping to the iommu is a poor design, > interrupt routing belongs in the irq subsystem, not in the iommu. > > The fact AMD and Intel both coupled their interrupt routing to their > iommu hardware is just a weird design decision. ARM didn't do this, > for instance. why does it matter in which device it resides? Way I see it, there is little reason to remap interrupts without also using an iommu, so why not a single device. what did I miss? > So I would not try to do this at all, you should have a > para-virtualized IRQ interface, not an extension to virtio-iommu > adding interrupt handling. :\ > > AFAIK hyperv shows how to build something like this. > > Jason
