Re: [PATCH 12/12] hw/xen: add support for Xen primary console in emulated mode

[David Woodhouse]

On Tue, 2023-10-24 at 15:20 +0100, Paul Durrant wrote:
> On 16/10/2023 16:19, David Woodhouse wrote:
> > From: David Woodhouse <dwmw@amazon.co.uk>
> > 
> > The primary console is special because the toolstack maps a page at a
> > fixed GFN and also allocates the guest-side event channel. Add support
> > for that in emulated mode, so that we can have a primary console.
> > 
> > Add a *very* rudimentary stub of foriegnmem ops for emulated mode, which
> > supports literally nothing except a single-page mapping of the console
> > page. This might as well have been a hack in the xen_console driver, but
> > this way at least the special-casing is kept within the Xen emulation
> > code, and it gives us a hook for a more complete implementation if/when
> > we ever do need one.
> > 
> Why can't you map the console page via the grant table like the xenstore 
> page?

I suppose we could, but I didn't really want the generic xen-console
device code having any more of a special case for 'Xen emulation' than
it does already by having to call xen_primary_console_create().

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