Default Xen PVM console?

Robert Watson rwatson at
Sun May 24 11:46:27 UTC 2009

On Sun, 24 May 2009, Scott Long wrote:

>>> 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.

Not sure I follow this comment: what I'm saying is that the Xen-specific 
console device should not use the same device names as syscons, so that the 
two can coexist in a single installation.

Robert N M Watson
Computer Laboratory
University of Cambridge

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