Re: [PATCH v8 18/43] KVM: arm64: Handle realm MMIO emulation

[Suzuki K Poulose]

On 16/04/2025 14:41, Steven Price wrote:
> MMIO emulation for a realm cannot be done directly with the VM's
> registers as they are protected from the host. However, for emulatable
> data aborts, the RMM uses GPRS[0] to provide the read/written value.
> We can transfer this from/to the equivalent VCPU's register entry and
> then depend on the generic MMIO handling code in KVM.
>
> For a MMIO read, the value is placed in the shared RecExit structure
> during kvm_handle_mmio_return() rather than in the VCPU's register
> entry.
>
> Signed-off-by: Steven Price <steven.price@xxxxxxx>
> Reviewed-by: Gavin Shan <gshan@xxxxxxxxxx>

Reviewed-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>