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Re: [Qemu-devel] [PATCH] arm: define version-based machine type for ARM


From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH] arm: define version-based machine type for ARM
Date: Thu, 15 Jan 2015 18:10:52 +0000

On 15 January 2015 at 17:50, Wei Huang <address@hidden> wrote:
> ARM virt machine type (machvirt) had been stable for a while. But recently
> new devices have been added to support extra features. Considerring the
> support of long-term compatibility, it is time to create a version-based
> machine types.
>
> This patch defines a qemu 2.2 specific machine type (machvirt-2.2) and
> points the default machvirt to it. In the future new machine types can
> follow a similar naming scheme (e.g. machvirt-3.0, ...). Note that this
> patch doesn't change the semantic of existing QEMU command line.

I don't think we're anywhere ready yet to support between
version migration compatibility. We will want this *eventually*
but we are a long long way away from needing it...(maybe a
year?)

thanks
-- PMM



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