Re: [Qemu-devel] [RFC PATCH 0/4] Qemu: Add Xen vIOMMU support

[Stefano Stabellini]

On Fri, 17 Mar 2017, Paolo Bonzini wrote:
> On 17/03/2017 12:29, Lan Tianyu wrote:
> > This patchset is to add Xen vIOMMU device model and handle
> > irq remapping stuffs. Xen vIOMMU emulation is in the Xen hypervisor
> > and the new device module in Qemu works as hypercall wrappers to
> > create and destroy vIOMMU in hypervisor.
> > 
> > Xen only supports emulated I440 and so we enable vIOMMU with emulated
> > I440 chipset. This works on Linux and Windows guest.
> 
> Any plans to change this?  Why is Xen not able to use Q35 with Intel
> IOMMU, with only special hooks for interrupt remapping?

CC'ing Anthony that worked on it in the past


> > Chao Gao (4):
> >   I440: Allow adding sysbus devices with -device on I440
> >   Xen: add a dummy vIOMMU to create/destroy vIOMMU in Xen
> >   xen-pt: bind/unbind interrupt remapping format MSI
> >   msi: taking interrupt format into consideration during judging a pirq
> >     is binded with a event channel
>