Re: [PATCH] hw/arm/virt: Default to architecture appropriate CPU

[Peter Maydell]

On Thu, 20 Aug 2020 at 05:55, Punit Agrawal
<punit1.agrawal@toshiba.co.jp> wrote:
>
> The default_cpu_type for the Virt machine is set to "cortex-a15" for
> both the arm (qemu-system-arm) and aarch64 (qemu-system-aarch64)
> targets.
>
> As a result, starting the aarch64 target with "-machine virt" defaults
> to booting with a Arm v7 cpu which is counter to
> expectation. Debugging the issue is further hampered by lack of any
> output from a supplied arm64 firmware as it is now running on the
> wrong CPU type.
>
> Fix this by defaulting to the "max" capability CPU for the target
> architecture. After the patch both the arm and aarch64 qemu default to
> the equivalent of passing "-cpu max".

Hi; this kind of thing has been suggested in the past several times.
Generally we've taken the view that we prefer:
 * not to make changes that would break pre-existing command lines
 * to maintain the general behaviour that a command line used
   with qemu-system-arm will also work with qemu-system-aarch64

It is certainly true that these days the default CPU type for
virt is not what most users want, though.

thanks
-- PMM