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Re: [Qemu-devel] [PATCH v4 07/07] s390: make sclp ascii console the defa

From: Alexander Graf
Subject: Re: [Qemu-devel] [PATCH v4 07/07] s390: make sclp ascii console the default
Date: Tue, 31 Jul 2012 14:52:47 +0200
User-agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:14.0) Gecko/20120713 Thunderbird/14.0

On 07/31/2012 02:44 PM, Christian Borntraeger wrote:
On 30/07/12 16:05, Alexander Graf wrote:
On 26.07.2012, at 10:59, Christian Borntraeger wrote:

This patch makes the sclp ascii default for S390. It requires a guest
kernel that autodetects the console and which not blindly assumes
that kvm means virtio console.
(commit cd1834591fe9564720ac4b0193bf1c790fe89f0d
    KVM: s390: Perform early event mask processing during boot)
Otherwise the guest admin has to explicitely add console=ttyS1 to the
command line.
Hrm. Could we make this the non-default for the time being with a simple 
-machine option to switch it to the default? When enough kernels are aware of 
the switch, we could then make it the default.
No problem, we can defer that patch. It was merely a testing aid for those who 
want to test the
sclp code. Later on maybe we can make that decision based on other thing.

Well, I'd like to have the logic around and easy to choose. Basically what I envision is that one day we do a flag day that introduces a compatibility machine type which only differs from the current one in that it sets said machine opt to "use ascii console as default".

That way for the time being, people who want to play with it only need to do -machine ascii_console=on and everything else would happen automatically. It'd definitely make it easier for everyone involved.


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