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Re: supported machines for aarch64

From: Peter Maydell
Subject: Re: supported machines for aarch64
Date: Fri, 19 Feb 2021 10:04:21 +0000

On Fri, 19 Feb 2021 at 08:05, <ckim@etri.re.kr> wrote:
> These are the machine lists that included cortex-a72 when I gave
> qemu-system-aarch64 --machine xxx --cpu help.

Adding '--machine whatever' to your command line does not change
the output of '--cpu help'. As Philippe says, it happens that
QEMU processes --cpu before --machine, so it handles '--cpu help',
prints the fixed list of supported CPUs, and ignores whether you
passed a valid --machine option or not.

There is no automated way to get QEMU to tell you which CPUs
a particular board model supports.

I recommend that you follow the advice given here
for how to choose a board model. (Short answer: if you know
you want to run guest code for a specific board type, use that
board type. Otherwise, use 'virt'.) Then, you should stick with
the default CPU type (ie, do not pass --cpu) for that board,
for all board types *except* 'virt'. For 'virt' you can pass
in the CPU type you want (and the documentation lists which
types it supports).

-- PMM

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