[PATCH 4/5] KVM: arm64: vgic-v3: Refactor GICv3 SGI generation

[Zenghui Yu]

On 2023/9/11 02:18, Marc Zyngier wrote:
> On Sun, 10 Sep 2023 17:25:36 +0100,
> Zenghui Yu <zenghui.yu at linux.dev> wrote:
>>
>> Hi Marc,
>>
>> I asked because it seems that in kvm/arm64 we always use
>> kvm_get_vcpu(kvm, i) to obtain the kvm_vcpu pointer, even if *i* is
>> sometimes essentially provided by userspace..
> 
> Huh, this is incredibly dodgy. I had a go at a few occurrences (see
> below), but this is hardly a complete list.

Another case is all kvm_get_vcpu(kvm, target_addr) in the vgic-its
emulation code. As we expose GITS_TYPER.PTA=0 to guest, which indicates
that the target address corresponds to the PE number specified by
GICR_TYPER.Processor_Number, which is now encoded as vcpu->vcpu_id.

Thanks,
Zenghui