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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: Mon, 30 Jul 2012 16:05:02 +0200

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.

The best case would be if we could determine what type of kernel (default to 
virtio-console vs runtime detect) we run before we spawn the VM, so we could 
spawn it with the respective default and keep all kernels working...


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