Re: [Xen-devel] [RFC Design Doc] Add vNVDIMM support for Xen

[Haozhong Zhang <haozhong.zhang@xxxxxxxxx>]

On 03/17/16 07:56, Jan Beulich wrote:
> >>> On 17.03.16 at 14:37, <haozhong.zhang@xxxxxxxxx> wrote:
> > On 03/17/16 11:05, Ian Jackson wrote:
> >> Jan Beulich writes ("Re: [Xen-devel] [RFC Design Doc] Add vNVDIMM support 
> >> for 
> > Xen"):
> >> > So that again leaves unaddressed the question of what you
> >> > imply to do when a guest elects to use such a page as page
> >> > table. I'm afraid any attempt of yours to invent something that
> >> > is not struct page_info will not be suitable for all possible needs.
> >> 
> >> It is not clear to me whether this is a realistic thing for a guest to
> >> want to do.  Haozhong, maybe you want to consider this aspect.
> >>
> > 
> > For HVM guests, it's themselves responsibility to not grant (e.g. in
> > xen-blk/net drivers) a vNVDIMM page containing page tables to others.
> > 
> > For PV guests (if we add vNVDIMM support for them in future), as I'm
> > going to use page_info struct for it, I suppose the current mechanism
> > in Xen can handle this case. I'm not familiar with PV memory
> > management and have to admit I didn't find the exact code that handles
> > the case that a memory page contains the guest page table. Jan, could
> > you indicate the code that I can follow to understand what xen does in
> > this case?
> 
> xen/arch/x86/mm.c has functions like __get_page_type(),
> alloc_page_type(), alloc_l[1234]_table(), and mod_l[1234]_entry()
> which all participate in this.
>

Thanks!

Haozhong

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