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From:   Jianyong Wu <jianyong.wu@arm.com>
To:     netdev@vger.kernel.org, yangbo.lu@nxp.com, john.stultz@linaro.org,
        tglx@linutronix.de, pbonzini@redhat.com,
        sean.j.christopherson@intel.com, maz@kernel.org,
        richardcochran@gmail.com, Mark.Rutland@arm.com,
        Will.Deacon@arm.com, suzuki.poulose@arm.com
Cc:     linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org,
        Steve.Capper@arm.com, Kaly.Xin@arm.com, justin.he@arm.com,
        jianyong.wu@arm.com, nd@arm.com
Subject: [RFC PATCH v4 5/5] kvm: arm64: Add capability check extension for ptp_kvm
Date:   Thu, 26 Sep 2019 19:42:12 +0800
Message-Id: <20190926114212.5322-6-jianyong.wu@arm.com>
In-Reply-To: <20190926114212.5322-1-jianyong.wu@arm.com>
References: <20190926114212.5322-1-jianyong.wu@arm.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Let userspace check if there is kvm ptp service in host.
before VMs migrate to a another host, VMM may check if this
cap is available to determine the migration behaviour.

Signed-off-by: Jianyong Wu <jianyong.wu@arm.com>
Suggested-by: Marc Zyngier <maz@kernel.org>
---
 include/uapi/linux/kvm.h | 1 +
 virt/kvm/arm/arm.c       | 1 +
 2 files changed, 2 insertions(+)

diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 2fe12b40d503..a0bff6002bd9 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -993,6 +993,7 @@ struct kvm_ppc_resize_hpt {
 #define KVM_CAP_ARM_SVE 170
 #define KVM_CAP_ARM_PTRAUTH_ADDRESS 171
 #define KVM_CAP_ARM_PTRAUTH_GENERIC 172
+#define KVM_CAP_ARM_KVM_PTP 173
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index bd5c55916d0d..80999985160b 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -201,6 +201,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_MP_STATE:
 	case KVM_CAP_IMMEDIATE_EXIT:
 	case KVM_CAP_VCPU_EVENTS:
+	case KVM_CAP_ARM_KVM_PTP:
 		r = 1;
 		break;
 	case KVM_CAP_ARM_SET_DEVICE_ADDR:
-- 
2.17.1