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xen-tools
Re: [Xen-tools] [PATCH] An example console driver using the store
Hi Rusty,
One thing we might want to consider doing is having the domain builder
allocate a page/event channel for the first console. This gives us
access to the console in a guest at start of day (and would work even if
the store is not running). I think this later reason is particuarily
important since it's hard to debug the XenBus code in a guest without a
console.
Also, it allows the PPC guys to hack up the hypervisor to support the
PAPR console stuff since they can get to the ring buffer by examining
the shared_info_frame. It's not a long term solution but it's useful.
Thoughts?
Regards,
Anthony Liguori
Rusty Russell wrote:
Sorry this took so long, distracted by other things.
This patch adds xenbus_early_write, for use before we can sleep, and
illustrates how a console driver can use the store. The console driver
replaces the normal one for testing, and uses the same ringbuf code as
xenbus (which really should be extracted into a separate library).
The toy client only handles a single page for the buffer, doesn't handle
^C etc.
This uncovered some bugs in xenstored: patches coming.
Cheers!
Rusty.
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
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