Re: [PATCH v2 5/7] KVM: PPC: mmio: Queue interrupt at kvmppc_emulate_mmio

[Alexey Kardashevskiy <aik@xxxxxxxxx>]

On 07/01/2022 07:03, Fabiano Rosas wrote:
> If MMIO emulation fails, we queue a Program interrupt to the
> guest. Move that line up into kvmppc_emulate_mmio, which is where we
> set RESUME_GUEST/HOST.
>
> No functional change, just separation of responsibilities.
>
> Signed-off-by: Fabiano Rosas <farosas@xxxxxxxxxxxxx>
> ---
>   arch/powerpc/kvm/emulate_loadstore.c | 4 +---
>   arch/powerpc/kvm/powerpc.c           | 2 +-
>   2 files changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/arch/powerpc/kvm/emulate_loadstore.c b/arch/powerpc/kvm/emulate_loadstore.c
> index 48272a9b9c30..ef50e8cfd988 100644
> --- a/arch/powerpc/kvm/emulate_loadstore.c
> +++ b/arch/powerpc/kvm/emulate_loadstore.c
> @@ -355,10 +355,8 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu)
>   		}
>   	}
>   
> -	if (emulated == EMULATE_FAIL) {
> +	if (emulated == EMULATE_FAIL)
>   		advance = 0;


You can now drop @advance by moving the "if" few lines down.


> -		kvmppc_core_queue_program(vcpu, 0);
> -	}
>   
>   	trace_kvm_ppc_instr(inst, kvmppc_get_pc(vcpu), emulated);
>   
> diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
> index 3fc8057db4b4..a2e78229d645 100644
> --- a/arch/powerpc/kvm/powerpc.c
> +++ b/arch/powerpc/kvm/powerpc.c
> @@ -307,7 +307,7 @@ int kvmppc_emulate_mmio(struct kvm_vcpu *vcpu)
>   		u32 last_inst;
>   
>   		kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst);
> -		/* XXX Deliver Program interrupt to guest. */
> +		kvmppc_core_queue_program(vcpu, 0);
>   		pr_info("%s: emulation failed (%08x)\n", __func__, last_inst);
>   		r = RESUME_HOST;
>   		break;

--
Alexey