+Michael and KVM s390 maintainers
On Tue, Oct 04, 2022, Alexey Kardashevskiy wrote:
> When introduced, IRQFD resampling worked on POWER8 with XICS. However
> KVM on POWER9 has never implemented it - the compatibility mode code
> ("XICS-on-XIVE") misses the kvm_notify_acked_irq() call and the native
> XIVE mode does not handle INTx in KVM at all.
>
> This moved the capability support advertising to platforms and stops
> advertising it on XIVE, i.e. POWER9 and later.
>
> This should cause no behavioural change for other architectures.
>
> Signed-off-by: Alexey Kardashevskiy <aik@xxxxxxxxx>
> Acked-by: Nicholas Piggin <npiggin@xxxxxxxxx>
> Acked-by: Marc Zyngier <maz@xxxxxxxxxx>
> ---
If no one objects, I'll grab this for 6.4 and route it through kvm-x86/generic.
> diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
> index fb1490761c87..908ce8bd91c9 100644
> --- a/arch/powerpc/kvm/powerpc.c
> +++ b/arch/powerpc/kvm/powerpc.c
> @@ -593,6 +593,12 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
> break;
> #endif
>
> +#ifdef CONFIG_HAVE_KVM_IRQFD
> + case KVM_CAP_IRQFD_RESAMPLE:
> + r = !xive_enabled();
> + break;
> +#endif
@PPC folks, do you want to avoid the #ifdef? If so, I can tweak to this when
applying.
case KVM_CAP_IRQFD_RESAMPLE:
r = IS_ENABLED(CONFIG_HAVE_KVM_IRQFD) && !xive_enabled();
break;
