Re: [Qemu-devel] [RFC 0/6] vSMMU initialization

[Will Deacon]

On Fri, Jun 12, 2015 at 03:20:04PM +0100, Baptiste Reynal wrote:
> The ARM SMMU has support for 2-stages address translations, allowing a virtual
> address to be translated at two levels:
> - Stage 1 translates a virtual address (VA) into an intermediate physical
> address (IPA)
> - Stage 2 translates an IPA into a physical address (PA)
> 
> Will Deacon introduced a virtual SMMU interface for KVM, which gives a virtual
> machine the possibility to use an IOMMU with native drivers. While the VM will
> program the first stage of translation (stage 1), the interface will program
> the second (stage 2) on the physical SMMU.

Please note that I have no plans to merge the kernel-side of this at the
moment. It was merely an exploratory tool to see what a non-PV vSMMU
implementation might look like and certainly not intended to be used in
anger.

Will