On Thu, Oct 21, 2021 at 03:47:09PM +0200, Igor Mammedov wrote: > On Wed, 20 Oct 2021 18:27:38 +0100 > Jean-Philippe Brucker <jean-phili...@linaro.org> wrote: > > > Allow instantiating a virtio-iommu device by adding an ACPI Virtual I/O > > Translation table (VIOT), which describes the relation between the > > virtio-iommu and the endpoints it manages. > > > > Add a hotplug handler for virtio-iommu on x86 and set the necessary > > reserved region property. On x86, the [0xfee00000, 0xfeefffff] DMA > > region is reserved for MSIs. DMA transactions to this range either > > trigger IRQ remapping in the IOMMU or bypasses IOMMU translation. > > shouldn't above be "IO remapping"?
No it is IRQ remapping: DMA writes to this address range are interrupt requests and the IOMMU may either perform interrupt remapping or pass it to the APIC directly > > > Although virtio-iommu does not support IRQ remapping it must be informed > > of the reserved region so that it can forward DMA transactions targeting > > this region. > > > > Reviewed-by: Eric Auger <eric.au...@redhat.com> > > Tested-by: Eric Auger <eric.au...@redhat.com> > > Signed-off-by: Jean-Philippe Brucker <jean-phili...@linaro.org> > > Reviewed-by: Igor Mammedov <imamm...@redhat.com> Thanks! Jean
