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SubjectRE: CMA enhancement - non-default areas in x86
Date
PCIe NTB 
Documentation/driver-api/ntb.rst

1) Basically PCI bridge between to root complex / PCI switches
2) using out of OS memory is one solution but then this memory is
Limited for usage by other stack, ex: get_user_pages on this memory will fail,
Therefore attempting to use it for block layer with (o_direct) will fail.

Acutely any generic stack which attempts to "pin" this memory will fail.

Leonid Ravich
> -----Original Message-----
> From: gregkh@linuxfoundation.org <gregkh@linuxfoundation.org>
> Sent: Wednesday, May 13, 2020 10:14 AM
> To: Idgar, Or
> Cc: linux-kernel@vger.kernel.org; linux-mm@kvack.org; Ravich, Leonid
> Subject: Re: CMA enhancement - non-default areas in x86
>
> On Wed, May 13, 2020 at 07:00:12AM +0000, Idgar, Or wrote:
> > > For what type of device?
> > NTB (Non-Transparent Bridge).
>
>
> Very odd quoting style...
>
> Anyway, what exactly is a non-transparent bridge, and why doesn't your
> bios/uefi implementation properly reserve the memory for it so that the OS
> does not use it?
>
> thanks,
>
> greg k-h

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