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Re: [Question] Can I start qemu-system-aarch64 with a vmlinux(ELF format


From: Kunkun Jiang
Subject: Re: [Question] Can I start qemu-system-aarch64 with a vmlinux(ELF format)?
Date: Thu, 29 Feb 2024 11:01:55 +0800
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1

Hi Peter,

On 2024/2/27 23:28, Peter Maydell wrote:
On Tue, 27 Feb 2024 at 14:42, Kunkun Jiang via <qemu-devel@nongnu.org> wrote:
Hi everybody,

I want to start qemu-system-aarch64 with a vmlinux,
which is an ELF format file. The arm_load_elf() is
implemented in arm_setup_direct_kernel_boot(). So I
thought it was supporting the ELF format file.
No, you can't do this. The hw/arm/boot.c code assumes
that ELF files are "bare metal" binaries, whereas
uImage format, AArch64 Image format, and raw binary files
are Linux kernels. Only the last three kinds of files will
be started with the boot protocol the Linux kernel expects.

For AArch64, pass the -kernel option the path to the Image
file, not the vmlinux file.
Yes, it works fine using Image files.
I would also like to ask again, is it because AArch64 does not
support vmlinux, or is it because qemu does not implement
this capability?

Thanks,
Kunkun Jiang




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