On Fri, Sep 03, 2021 at 04:32:09PM +0200, Jean-Philippe Brucker wrote: > Document the virtio-iommu device for qemu-system-x86_64. In particular > note the lack of interrupt remapping, which may be an important > limitation on x86. > > Suggested-by: Eric Auger <[email protected]> > Signed-off-by: Jean-Philippe Brucker <[email protected]> > --- > 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.
It would be desirable to document why this is better/worse/equiv to the intel-iommu device documented just before, so that people have a better idea of which they should be trying to use. I'm going to assume intel-iommu is more likely to "just work" out of the box since it models real hardware that OS are likely to already support ? Is that right though ? Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
