Re: [Xen-devel] [PATCH 3/4 RFC] x86/p2m: use large pages for MMIO mappings

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Jan,

On 15/09/2015 08:34, Jan Beulich wrote:
> When mapping large BARs (e.g. the frame buffer of a graphics card) the
> overhead or establishing such mappings using onle 4k pages has,
> particularly after the XSA-125 fix, become unacceptable. Alter the
> XEN_DOMCTL_memory_mapping semantics once again, so that there's no
> longer a fixed amount of guest frames that represents the upper limit
> of what a single invocation can map. Instead bound execution time by
> limiting the number of iterations (regardless of page size).
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> ---
> RFC reasons:
> - ARM side unimplemented (and hence libxc for now made cope with both
>    models), the main issue (besides my inability to test any change
>    there) being the many internal uses of map_mmio_regions())
I will give a look to this bits.

Regards,

--
Julien Grall

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