Re: hvf: Invalid ISV on data abort

[Alexander Graf]

Hi Antonio,

On 02.08.23 11:43, Antonio Caggiano wrote:
> Hi there,
>
> I am trying to bring up a guest on HVF, which at a certain point is
> trying to write to an area of mmio space and it triggers a data abort
> where ISV=0 (translation fault level 2).
>
> I wonder what could cause it and how to recover.


QEMU's HVF implementation - like KVM - only supports MMIO accesses from 
hardware decoded, "simple" load/store instructions. It will only execute 
guest OSs that are aware of that limitation and limit MMIO accesses to 
that set of instructions, such as Linux.

If you see this effect with an enlightened OS, you are most likely 
exposing memory that the guest expects to be represented as RAM as MMIO.


Thanks,

Alex





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