Re: [Xen-devel] Shared page tables between ETP and IOMMU issue

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 26.02.15 at 17:29, <roger.pau@xxxxxxxxxx> wrote:
> OK, I will try to take a look. All those faults come from physical
> memory ranges that are supposed to be usable, and in fact the CPU seems
> to be able to read/write from them without problems, or else the guest
> would have crashed much more early. Regarding sharing the page tables
> between EPT and the IOMMU, is there some bit that needs to be set in the
> ept entry in order to mark a page as available by the IOMMU?

Bits 0 and 1 (read and write) are shared between VT-d and EPT
(as is bit 7 - see struct dma_pte and ept_entry_t).

Jan


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