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Date:      Sun, 24 May 2009 05:31:22 -0600
From:      Scott Long <scottl@samsco.org>
To:        Robert Watson <rwatson@freebsd.org>
Cc:        Ed Schouten <ed@80386.nl>, FreeBSD Current <freebsd-current@freebsd.org>, freebsd-xen@freebsd.org
Subject:   Re: Default Xen PVM console?
Message-ID:  <4A19300A.1020906@samsco.org>
In-Reply-To: <alpine.BSF.2.00.0905241043360.75344@fledge.watson.org>
References:  <d763ac660905232026n6542fd17k8f6c8625543be4fa@mail.gmail.com>	<20090524091436.GR1271@hoeg.nl> <alpine.BSF.2.00.0905241043360.75344@fledge.watson.org>

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Robert Watson wrote:
> On Sun, 24 May 2009, Ed Schouten wrote:
> 
>> * Adrian Chadd <adrian@freebsd.org> wrote:
>>> * Modify the xenconsole driver to attach to ttyv0 (via a kernel 
>>> environment variable) so /etc/ttys doesn't need modifying (but this 
>>> may confuse tools that assumes /dev/ttyvX == syscons.)
>>
>> Please don't. Someone on IRC told me Xen also has some framebuffer 
>> feature. Say, someone would port syscons to Xen, the naming would 
>> conflict with the console device node. /dev/xc0 is good enough. I even 
>> think it should have been called ttyx0, not xc0.
> 
> Given that there will be increasing levels of support for "pass-through" 
> hardware access in virtual machine environments and a trend in the 
> direction of virtualization-friendly hardware, we shouldn't preclude the 
> possibility of something a lot closer to syscons working inside of Xen 
> in the future.  This means we should leave the syscons device names open 
> so that syscons can claim them if desired.
> 

HVM mode already supports "pass-through" with syscons working in it.
That is orthogonal to the discussion of supporting the native
virtualization features of Xen.

Scott



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