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From: Pavel Fedin <p.fedin@samsung.com>
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Date: Thu, 07 May 2015 09:36:59 +0300
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Subject: Re: [Qemu-devel] [PATCH] Fix default CPU model for ARM64
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To: 'Peter Maydell' <peter.maydell@linaro.org>
Cc: 'QEMU Developers' <qemu-devel@nongnu.org>

 Hello!

> Yes. qemu-system-aarch64 -cpu cortex-a15 gets you a 32-bit Cortex-A15. =
This is
> exactly like the x86 QEMU, where you can emulate all the 32-bit x86 =
CPUs in
> qemu-system-x86_64.

 And what is the default in x86_64 ? I believe it's 64-bit CPU, and not =
i686, isn't it ?
 I agree that -cpu cortex-a15 might work with qemu-system-aarch64. But =
isn't it expected to get the "native" CPU by default ? This behavior of =
qemu causes weird thing with libvirt/virt-manager. I create a VM, =
specify "aarch64" as architecture, and set "hypervisor default" as CPU =
model. With "hypervisor default" libvirt does not pass any -cpu option =
to qemu, leaving it up to the emulator (exactly as expected). So, i =
supply 64-bit kernel and rootfs, and nothing works. I have to explicitly =
change the CPU to "cortex-a57". Isn't it confusing to have such a =
default ?
 This is even more confusing since currently i don't know any =
implementation of aarch64 except A57 and A53 (which are the same from =
software point of view). So, i believe, A57 is quite a reasonable =
default.

Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia