Re: [Qemu-devel] [PATCH v2 1/3] intel-iommu: differentiate host address width from IOVA address width.

[Peter Xu]

On Wed, Nov 14, 2018 at 02:04:42PM +0800, Yu Zhang wrote:
> Currently, vIOMMU is using the value of IOVA address width, instead of
> the host address width(HAW) to calculate the number of reserved bits in
> data structures such as root entries, context entries, and entries of
> DMA paging structures etc.
> 
> However values of IOVA address width and of the HAW may not equal. For
> example, a 48-bit IOVA can only be mapped to host addresses no wider than
> 46 bits. Using 48, instead of 46 to calculate the reserved bit may result
> in an invalid IOVA being accepted.
> 
> To fix this, a new field - haw_bits is introduced in struct IntelIOMMUState,
> whose value is initialized based on the maximum physical address set to
> guest CPU. Also, definitions such as VTD_HOST_AW_39/48BIT etc. are renamed
> to clarify.
> 
> Signed-off-by: Yu Zhang <address@hidden>

Reviewed-by: Peter Xu <address@hidden>

-- 
Peter Xu