Re: [RFC v1 00/38] arm cleanup experiment for kvm-only build

[Philippe Mathieu-Daudé]

On 3/3/21 7:54 PM, Richard Henderson wrote:
> On 3/3/21 10:45 AM, Claudio Fontana wrote:
>> It is a bit weird that qemu-system-aarch64 runs with a cortex-a15
>> model tbh, as cortex-a15 is not capable of aarch64.
> 
> No, but qemu-system-aarch64 is capable of 32-bit emulation (because most
> 64-bit cpus retain 32-bit mode).  It takes no extra effort to run
> cortex-a15 than it does a cortex-a57.

IIRC qemu-system-arm starts the aa64 cores in 32-bit mode, while
qemu-system-aarch64 in 64-bit (this gave me trouble because the
kernels for the raspi 64-bit SoCs are in 32-bit mode -- because
the GPU starts them in this mode).

> I have wondered if we should have just one qemu-system-arm that does it
> all and drop the separate qemu-system-aarch64 -- or vice versa.  But
> we've had the separation around so long I'm sure someone would be confused.

That would be great cleanup IMHO.