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Re: [Qemu-devel] [PATCH] Fix default CPU model for ARM64
From: |
Pavel Fedin |
Subject: |
Re: [Qemu-devel] [PATCH] Fix default CPU model for ARM64 |
Date: |
Thu, 07 May 2015 09:36:59 +0300 |
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
- [Qemu-devel] [PATCH] Fix default CPU model for ARM64, Pavel Fedin, 2015/05/06
- Re: [Qemu-devel] [PATCH] Fix default CPU model for ARM64, Peter Maydell, 2015/05/06
- Re: [Qemu-devel] [PATCH] Fix default CPU model for ARM64, Pavel Fedin, 2015/05/06
- Re: [Qemu-devel] [PATCH] Fix default CPU model for ARM64, Peter Maydell, 2015/05/06
- Re: [Qemu-devel] [PATCH] Fix default CPU model for ARM64,
Pavel Fedin <=
- Re: [Qemu-devel] [PATCH] Fix default CPU model for ARM64, Cole Robinson, 2015/05/07
- Re: [Qemu-devel] [PATCH] Fix default CPU model for ARM64, Pavel Fedin, 2015/05/08
- Re: [Qemu-devel] [PATCH] Fix default CPU model for ARM64, Peter Crosthwaite, 2015/05/08
- Re: [Qemu-devel] [PATCH] Fix default CPU model for ARM64, Pavel Fedin, 2015/05/08
- Re: [Qemu-devel] [PATCH] Fix default CPU model for ARM64, Peter Crosthwaite, 2015/05/08
- Re: [Qemu-devel] [PATCH] Fix default CPU model for ARM64, Paolo Bonzini, 2015/05/08
- Re: [Qemu-devel] [PATCH] Fix default CPU model for ARM64, Cole Robinson, 2015/05/10