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

["Ye, Wei" <wei.ye@xxxxxxxxx>]

> -----Original Message-----
> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> Sent: Tuesday, August 5, 2014 2:35 PM
> To: Tian, Kevin
> Cc: ian.campbell@xxxxxxxxxx; Paul.Durrant@xxxxxxxxxx;
> ian.jackson@xxxxxxxxxxxxx; stefano.stabellini@xxxxxxxxxxxxx; Ye, Wei; Lv,
> Zhiyuan; xen-devel@xxxxxxxxxxxxx; keir@xxxxxxx; tim@xxxxxxx
> Subject: RE: [PATCH v1 0/2] Extend ioreq-server to support page write
> protection
> 
> >>> On 04.08.14 at 23:34, <kevin.tian@xxxxxxxxx> wrote:
> > 2nd option, like Wei mentioned in another mail, is to treat such write
> > protected PPGTT page tables as MMIO. new hypercall is required to
> > change the p2m type between p2m_io and p2m_ram, based on
> > allocation/free of guest page table. This way may impact performance
> > on read though.
> 
> Depends on whether you mean mmio_dm or mmio_direct here.
> 
> Jan

It's p2m_mmio_dm.


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