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cpu.write_mem to MMIO devices is ignored #95

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vringar opened this issue Dec 17, 2024 · 2 comments · May be fixed by #96
Open

cpu.write_mem to MMIO devices is ignored #95

vringar opened this issue Dec 17, 2024 · 2 comments · May be fixed by #96

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@vringar
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vringar commented Dec 17, 2024

As write_mem used the cpu_memory_rw_debug function it can not write to MMIO devices. The relevant upstream issue
I needed this for my fuzzing, so I adapted the proposed patch and it works for me.
I'm unable to engage with the QEMU mailing list, but I'd happily upstream this to you, if you are interested in taking it.
@rmalmain
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indeed, thanks for the proposition. i think it would be nice to expose this in some way.
do you mind opening a pr with the changes you did? i can have a look at your patch.

@vringar vringar linked a pull request Dec 18, 2024 that will close this issue
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@vringar
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vringar commented Dec 20, 2024

I've challenged myself and am currently trying to get the patch directly into QEMU as well v1 v2

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physmem: allow cpu_memory_rw_debug to write to MMIO devices vringar/qemu-libafl-bridge
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@rmalmain @vringar