Re: [PATCH V9 6/6] hw/mips: Add Loongson-3 machine support

[Philippe Mathieu-Daudé]

On 9/16/20 11:49 AM, Huacai Chen wrote:
>>> We now already have a full functional Linux kernel (based on Linux-5.4.x
>>> LTS, the kvm host side and guest side have both been upstream for Linux-
>>> 5.9, but Linux-5.9 has not been released yet) here:
>>>
>>> https://github.com/chenhuacai/linux
>>>
>>> Of course the upstream kernel is also usable (though it is "unstable"
>>> now):
>>>
>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>>
>>> How to use QEMU/Loongson-3?
>>> 1, Download kernel source from the above URL;
>>> 2, Build a kernel with arch/mips/configs/loongson3_defconfig;
>>> 3, Boot a Loongson-3A4000 host with this kernel (for KVM mode);
>>> 4, Build QEMU-master with this patchset;
>>
>> Which produces all the following errors:
>>
>> hw/mips/loongson3_virt.c: In function 'get_cpu_freq':
>> hw/mips/loongson3_virt.c:372:12: error: variable 'freq_reg' has
>> initializer but incomplete type
>>      struct kvm_one_reg freq_reg = {
>>             ^
>> hw/mips/loongson3_virt.c:373:9: error: unknown field 'id' specified in
>> initializer
>>          .id = KVM_REG_MIPS_COUNT_HZ,
>>          ^
>> hw/mips/loongson3_virt.c:373:15: error: 'KVM_REG_MIPS_COUNT_HZ'
>> undeclared (first use in this function)
>>          .id = KVM_REG_MIPS_COUNT_HZ,
>>                ^
> I don't know how to reproduce these errors, struct kvm_one_reg and
> KVM_REG_MIPS_COUNT_HZ are both defined..., could you please tell me?
> My build steps are like this:
> mkdir build
> cd build
> ../configure
> make

Building on Ubuntu 20.04.

C compiler for the host machine: cc (gcc 9.3.0 "cc (Ubuntu
9.3.0-10ubuntu2) 9.3.0")
C linker for the host machine: cc ld.bfd 2.34