Re: [Xen-devel] [PATCH v10 1/3] ioreq-server: add support for multiple servers

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 22.05.14 at 12:38, <paul.durrant@xxxxxxxxxx> wrote:
> The previous single ioreq server that was created on demand now
> becomes the default server and an API is created to allow secondary
> servers, which handle specific IO ranges or PCI devices, to be added.
> 
> When the guest issues an IO the list of secondary servers is checked
> for a matching IO range or PCI device. If none is found then the IO
> is passed to the default server.
> 
> Secondary servers use guest pages to communicate with emulators, in
> the same way as the default server. These pages need to be in the
> guest physmap otherwise there is no suitable reference that can be
> queried by an emulator in order to map them. Therefore a pool of
> pages in the current E820 reserved region, just below the special
> pages is used. Secondary servers allocate from and free to this pool
> as they are created and destroyed.
> 
> The size of the pool is currently hardcoded in the domain build at a
> value of 8. This should be sufficient for now and both the location and
> size of the pool can be modified in future without any need to change the
> API.
> 
> Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

I committed and pushed this, but I had to fix up two build errors
with XSM enabled. Please in the future make sure patches you
submit build in all relevant modes.

Jan


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