Re: [PATCH kernel] KVM: PPC: Make KVM_CAP_IRQFD_RESAMPLE platform dependent

[Nicholas Piggin]

Seems okay to me, it probably better go through the KVM tree though.

Acked-by: Nicholas Piggin <npiggin@xxxxxxxxx>

Thanks,
Nick

On Tue Sep 13, 2022 at 10:50 PM AEST, Alexey Kardashevskiy wrote:
> Ping? It's been a while and probably got lost :-/
>
> On 18/05/2022 16:27, Alexey Kardashevskiy wrote:
> > 
> > 
> > On 5/4/22 17:48, 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.
> >>
> >> Signed-off-by: Alexey Kardashevskiy <aik@xxxxxxxxx>
> >> ---
> >>
> >>
> >> Or I could move this one together with KVM_CAP_IRQFD. Thoughts?
> > 
> > 
> > Ping?
> > 
> >>
> >> ---
> >>   arch/arm64/kvm/arm.c       | 3 +++
> >>   arch/mips/kvm/mips.c       | 3 +++
> >>   arch/powerpc/kvm/powerpc.c | 6 ++++++
> >>   arch/riscv/kvm/vm.c        | 3 +++
> >>   arch/s390/kvm/kvm-s390.c   | 3 +++
> >>   arch/x86/kvm/x86.c         | 3 +++
> >>   virt/kvm/kvm_main.c        | 1 -
> >>   7 files changed, 21 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
> >> index 523bc934fe2f..092f0614bae3 100644
> >> --- a/arch/arm64/kvm/arm.c
> >> +++ b/arch/arm64/kvm/arm.c
> >> @@ -210,6 +210,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, 
> >> long ext)
> >>       case KVM_CAP_SET_GUEST_DEBUG:
> >>       case KVM_CAP_VCPU_ATTRIBUTES:
> >>       case KVM_CAP_PTP_KVM:
> >> +#ifdef CONFIG_HAVE_KVM_IRQFD
> >> +    case KVM_CAP_IRQFD_RESAMPLE:
> >> +#endif
> >>           r = 1;
> >>           break;
> >>       case KVM_CAP_SET_GUEST_DEBUG2:
> >> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> >> index a25e0b73ee70..0f3de470a73e 100644
> >> --- a/arch/mips/kvm/mips.c
> >> +++ b/arch/mips/kvm/mips.c
> >> @@ -1071,6 +1071,9 @@ int kvm_vm_ioctl_check_extension(struct kvm 
> >> *kvm, long ext)
> >>       case KVM_CAP_READONLY_MEM:
> >>       case KVM_CAP_SYNC_MMU:
> >>       case KVM_CAP_IMMEDIATE_EXIT:
> >> +#ifdef CONFIG_HAVE_KVM_IRQFD
> >> +    case KVM_CAP_IRQFD_RESAMPLE:
> >> +#endif
> >>           r = 1;
> >>           break;
> >>       case KVM_CAP_NR_VCPUS:
> >> diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
> >> index 875c30c12db0..87698ffef3be 100644
> >> --- a/arch/powerpc/kvm/powerpc.c
> >> +++ b/arch/powerpc/kvm/powerpc.c
> >> @@ -591,6 +591,12 @@ 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
> >> +
> >>       case KVM_CAP_PPC_ALLOC_HTAB:
> >>           r = hv_enabled;
> >>           break;
> >> diff --git a/arch/riscv/kvm/vm.c b/arch/riscv/kvm/vm.c
> >> index c768f75279ef..b58579b386bb 100644
> >> --- a/arch/riscv/kvm/vm.c
> >> +++ b/arch/riscv/kvm/vm.c
> >> @@ -63,6 +63,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, 
> >> long ext)
> >>       case KVM_CAP_READONLY_MEM:
> >>       case KVM_CAP_MP_STATE:
> >>       case KVM_CAP_IMMEDIATE_EXIT:
> >> +#ifdef CONFIG_HAVE_KVM_IRQFD
> >> +    case KVM_CAP_IRQFD_RESAMPLE:
> >> +#endif
> >>           r = 1;
> >>           break;
> >>       case KVM_CAP_NR_VCPUS:
> >> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> >> index 156d1c25a3c1..85e093fc8d13 100644
> >> --- a/arch/s390/kvm/kvm-s390.c
> >> +++ b/arch/s390/kvm/kvm-s390.c
> >> @@ -564,6 +564,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, 
> >> long ext)
> >>       case KVM_CAP_SET_GUEST_DEBUG:
> >>       case KVM_CAP_S390_DIAG318:
> >>       case KVM_CAP_S390_MEM_OP_EXTENSION:
> >> +#ifdef CONFIG_HAVE_KVM_IRQFD
> >> +    case KVM_CAP_IRQFD_RESAMPLE:
> >> +#endif
> >>           r = 1;
> >>           break;
> >>       case KVM_CAP_SET_GUEST_DEBUG2:
> >> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> >> index 0c0ca599a353..a0a7b769483d 100644
> >> --- a/arch/x86/kvm/x86.c
> >> +++ b/arch/x86/kvm/x86.c
> >> @@ -4273,6 +4273,9 @@ int kvm_vm_ioctl_check_extension(struct kvm 
> >> *kvm, long ext)
> >>       case KVM_CAP_SYS_ATTRIBUTES:
> >>       case KVM_CAP_VAPIC:
> >>       case KVM_CAP_ENABLE_CAP:
> >> +#ifdef CONFIG_HAVE_KVM_IRQFD
> >> +    case KVM_CAP_IRQFD_RESAMPLE:
> >> +#endif
> >>           r = 1;
> >>           break;
> >>       case KVM_CAP_EXIT_HYPERCALL:
> >> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> >> index 70e05af5ebea..885e72e668a5 100644
> >> --- a/virt/kvm/kvm_main.c
> >> +++ b/virt/kvm/kvm_main.c
> >> @@ -4293,7 +4293,6 @@ static long 
> >> kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
> >>   #endif
> >>   #ifdef CONFIG_HAVE_KVM_IRQFD
> >>       case KVM_CAP_IRQFD:
> >> -    case KVM_CAP_IRQFD_RESAMPLE:
> >>   #endif
> >>       case KVM_CAP_IOEVENTFD_ANY_LENGTH:
> >>       case KVM_CAP_CHECK_EXTENSION_VM:
> > 
>
> -- 
> Alexey