Re: [Xen-devel] [PATCH v1 0/2] Extend ioreq-server to support page write protection

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 28.07.14 at 19:55, <wei.ye@xxxxxxxxx> wrote:
> ioreq-server is proposed to forward PIO and MMIO request to multiple device
> models according to the io range. XenGT (Intel Graphics Virtualization 
> technology,
> please refer to 
> https://01.org/xen/blogs/srclarkx/2013/graphics-virtualization- 
> xengt) driver reside in Dom0 as a virtual graphics device model also need to 
> trap
> and emulate the guest's write operation to some specific memory pages, like 
> the
> memory pages used by guest graphics driver as PPGTT(per-process graphics 
> translation table). We add an new p2m type "p2m_ram_wp" to trap the page 
> write
> operation. Page of this new p2m type is read only and for write, the request 
> will
> go to device model via ioreq-server.

So how is this write-protection supposed to work on the IOMMU side
when sharing page tables?

Jan


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