On Wed, Sep 3, 2014 at 12:47 AM, Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote: > Il 03/09/2014 02:25, Benjamin Herrenschmidt ha scritto: >> > But there aren't any ACPI systems with both virtio-pci and IOMMUs, >> > right? So we could say that, henceforth, ACPI systems must declare >> > whether virtio-pci devices live behind IOMMUs without breaking >> > backward compatibility. >> >> I don't know for sure whether that's the case and whether we can rely on >> that not happening, we'll need x86 folks opinion here. > > IOMMU support for x86 is going to go in this week. > Can you try to make sure that qemu-system-x86_64 -device iommu -device virtio-balloon-pci (or whatever the syntax is) doesn't put the virtio-pci device behind the IOMMU? Because, if it does, then the kernel will have to support that, and it'll be messy. --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
