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From:   Gavin Shan <gshan@redhat.com>
To:     kvmarm@lists.cs.columbia.edu
Cc:     linux-kernel@vger.kernel.org, james.morse@arm.com,
        mark.rutland@arm.com, Jonathan.Cameron@huawei.com, will@kernel.org,
        maz@kernel.org, pbonzini@redhat.com
Subject: [PATCH v4 03/21] KVM: arm64: Support SDEI_VERSION hypercall
Date:   Sun, 15 Aug 2021 08:13:34 +0800
Message-Id: <20210815001352.81927-4-gshan@redhat.com>
In-Reply-To: <20210815001352.81927-1-gshan@redhat.com>
References: <20210815001352.81927-1-gshan@redhat.com>
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This supports SDEI_VERSION hypercall by returning v1.0.0 simply
when the functionality is supported on the VM and vCPU.

Signed-off-by: Gavin Shan <gshan@redhat.com>
---
 arch/arm64/kvm/sdei.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
index ab330b74a965..aa9485f076a9 100644
--- a/arch/arm64/kvm/sdei.c
+++ b/arch/arm64/kvm/sdei.c
@@ -70,6 +70,22 @@ static void kvm_sdei_remove_vcpu_events(struct kvm_vcpu *vcpu)
 	}
 }
 
+static unsigned long kvm_sdei_hypercall_version(struct kvm_vcpu *vcpu)
+{
+	struct kvm *kvm = vcpu->kvm;
+	struct kvm_sdei_kvm *ksdei = kvm->arch.sdei;
+	struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
+	unsigned long ret = SDEI_NOT_SUPPORTED;
+
+	if (!(ksdei && vsdei))
+		return ret;
+
+	/* v1.0.0 */
+	ret = (1UL << SDEI_VERSION_MAJOR_SHIFT);
+
+	return ret;
+}
+
 int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
 {
 	u32 func = smccc_get_function(vcpu);
@@ -78,6 +94,8 @@ int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
 
 	switch (func) {
 	case SDEI_1_0_FN_SDEI_VERSION:
+		ret = kvm_sdei_hypercall_version(vcpu);
+		break;
 	case SDEI_1_0_FN_SDEI_EVENT_REGISTER:
 	case SDEI_1_0_FN_SDEI_EVENT_ENABLE:
 	case SDEI_1_0_FN_SDEI_EVENT_DISABLE:
-- 
2.23.0