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

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Message-ID: <56CF16FC.6050609@oracle.com>
Date:	Thu, 25 Feb 2016 10:00:12 -0500
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	xen-devel@...ts.xensource.com
Cc:	linux-kernel@...r.kernel.org, david.vrabel@...rix.com,
	konrad.wilk@...cle.com
Subject: Re: [PATCH v2 1/3] hvc_xen: add earlycon support

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@...citrix.com>

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