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

[Paul Durrant <xadimgnik@xxxxxxxxx>]

On 16/10/2023 16:19, David Woodhouse wrote:
> From: David Woodhouse <dwmw@xxxxxxxxxxxx>
>
> 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?
  Paul