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

> -----Original Message-----
> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> Sent: 02 June 2014 09:05
> To: Paul Durrant
> Cc: Ian Jackson; Stefano Stabellini; xen-devel@xxxxxxxxxxxxx
> Subject: Re: [PATCH v10 1/3] ioreq-server: add support for multiple servers
> >>> 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.

Apologies. I didn't realise I had to explicitly enable it in the build. I'll 
know for next time.


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