Hi Jean, On 9/3/21 4:32 PM, Jean-Philippe Brucker wrote: > Document the virtio-iommu device for qemu-system-x86_64. In particular Nit: this is not only for qemu-system-x86_6. This also documents the option usage for aarch64. Only the interrupt remapping note is x86-64 specific.
I think it also would be worth to mention the interaction with the bypass iommu option as you mention "for all devices". Thanks Eric > note the lack of interrupt remapping, which may be an important > limitation on x86. > > Suggested-by: Eric Auger <eric.au...@redhat.com> > Signed-off-by: Jean-Philippe Brucker <jean-phili...@linaro.org> > --- > qemu-options.hx | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/qemu-options.hx b/qemu-options.hx > index 83aa59a920..9a1906a748 100644 > --- a/qemu-options.hx > +++ b/qemu-options.hx > @@ -976,6 +976,9 @@ SRST > Please also refer to the wiki page for general scenarios of VT-d > emulation in QEMU: https://wiki.qemu.org/Features/VT-d. > > +``-device virtio-iommu`` > + Enable a paravirtual IOMMU, that manages DMA isolation and remapping > + for all PCI devices, but does not support interrupt remapping. > ERST > > DEF("name", HAS_ARG, QEMU_OPTION_name,
