Re: [PATCH v2 1/3] hvc_xen: add earlycon support

From: Boris Ostrovsky
Date: Thu Feb 25 2016 - 10:00:23 EST

On 02/25/2016 07:10 AM, Stefano Stabellini wrote:
Introduce EARLYCON support in hvc_xen, useful for early debugging on arm
and arm64, where xen early_printk is not available.

It is different from xenboot_write_console on x86 in two ways:

- it does not return if !xen_pv_domain(), not only because ARM guests
are xen_hvm_domain(), but also because we want to capture all the
early boot messages, before xen support is discovered
- it does not try to print to the domU console at all, because xen
support will only be discovered at a later point

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>