Re: [Qemu-devel] [PATCH V3] virtio: do not require IOMMU to be created in advance

[Peter Xu]

On Tue, Mar 07, 2017 at 05:09:11PM +0800, Jason Wang wrote:
> After commit 96a8821d2141 ("virtio: unbreak virtio-pci with IOMMU
> after caching ring translations"), IOMMU was required to be created in
> advance. This is because we can only get the correct dma_as after pci
> IOMMU (e.g intel_iommu) was initialized. This is suboptimal and
> inconvenient for user. This patch releases this by:
> 
> - introduce a bus_master_ready method for PCIDeviceClass and trigger
>   this during pci_init_bus_master
> - implement virtio-pci method and 1) reset the dma_as 2) re-register
>   the memory listener to the new dma_as
> 
> Cc: Paolo Bonzini <address@hidden>
> Signed-off-by: Jason Wang <address@hidden>

Reviewed-by: Peter Xu <address@hidden>