On Wed, May 4, 2022 at 1:18 PM Alexey Kardashevskiy <aik@xxxxxxxxx> 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?
For KVM RISC-V:
Acked-by: Anup Patel <anup@xxxxxxxxxxxxxx>
Thanks,
Anup
>
> ---
> 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:
> --
> 2.30.2
>
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