linux-kernel - [PATCH v5 11/22] KVM: arm64: Support SDEI_PE

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Date:   Tue, 22 Mar 2022 16:06:59 +0800
From:   Gavin Shan <gshan@...hat.com>
To:     kvmarm@...ts.cs.columbia.edu
Cc:     linux-kernel@...r.kernel.org, eauger@...hat.com,
        shannon.zhaosl@...il.com, maz@...nel.org,
        Jonathan.Cameron@...wei.com, will@...nel.org, pbonzini@...hat.com,
        james.morse@....com, mark.rutland@....com, drjones@...hat.com,
        vkuznets@...hat.com, shan.gavin@...il.com
Subject: [PATCH v5 11/22] KVM: arm64: Support SDEI_PE_{MASK, UNMASK} hypercall

This supports SDEI_PE_{MASK, UNMASK} hypercall. They are used by
the guest to stop or start receiving SDEI event on the specified
vCPU.

Signed-off-by: Gavin Shan <gshan@...hat.com>
---
 arch/arm64/kvm/sdei.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
index db82ea441eae..b2a916724cfa 100644
--- a/arch/arm64/kvm/sdei.c
+++ b/arch/arm64/kvm/sdei.c
@@ -625,6 +625,18 @@ static unsigned long hypercall_route(struct kvm_vcpu *vcpu)
 	return ret;
 }
 
+static unsigned long hypercall_mask(struct kvm_vcpu *vcpu, bool mask)
+{
+	struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
+	unsigned long ret = SDEI_SUCCESS;
+
+	spin_lock(&vsdei->lock);
+	vsdei->state.masked = mask ? 1 : 0;
+	spin_unlock(&vsdei->lock);
+
+	return ret;
+}
+
 int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
 {
 	struct kvm *kvm = vcpu->kvm;
@@ -680,7 +692,11 @@ int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
 		ret = hypercall_route(vcpu);
 		break;
 	case SDEI_1_0_FN_SDEI_PE_MASK:
+		ret = hypercall_mask(vcpu, true);
+		break;
 	case SDEI_1_0_FN_SDEI_PE_UNMASK:
+		ret = hypercall_mask(vcpu, false);
+		break;
 	case SDEI_1_0_FN_SDEI_INTERRUPT_BIND:
 	case SDEI_1_0_FN_SDEI_INTERRUPT_RELEASE:
 	case SDEI_1_1_FN_SDEI_EVENT_SIGNAL:
-- 
2.23.0