linux-kernel - [PATCH v7 10/22] KVM: arm64: Support PE

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Message-Id: <20220527080253.1562538-11-gshan@redhat.com>
Date:   Fri, 27 May 2022 16:02:41 +0800
From:   Gavin Shan <gshan@...hat.com>
To:     kvmarm@...ts.cs.columbia.edu
Cc:     maz@...nel.org, linux-kernel@...r.kernel.org, eauger@...hat.com,
        oupton@...gle.com, Jonathan.Cameron@...wei.com,
        pbonzini@...hat.com, vkuznets@...hat.com, will@...nel.org,
        james.morse@....com, mark.rutland@....com,
        shannon.zhaosl@...il.com, shijie@...eremail.onmicrosoft.com,
        shan.gavin@...il.com
Subject: [PATCH v7 10/22] KVM: arm64: Support PE_{MASK, UNMASK} hypercall

This supports PE_{MASK, UNMASK} hypercall. When PE_UNMASK is called,
KVM_REQ_SDEI request becomes pending if there are any events need
to be delivered.

Signed-off-by: Gavin Shan <gshan@...hat.com>
---
 arch/arm64/kvm/sdei.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
index cea523418c75..6afa49b4f3c7 100644
--- a/arch/arm64/kvm/sdei.c
+++ b/arch/arm64/kvm/sdei.c
@@ -169,6 +169,21 @@ static unsigned long event_info(struct kvm_vcpu *vcpu)
 	return ret;
 }
 
+static unsigned long pe_mask(struct kvm_vcpu *vcpu, bool mask)
+{
+	struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
+
+	if (mask) {
+		vcpu->arch.flags |= KVM_ARM64_SDEI_MASKED;
+	} else {
+		vcpu->arch.flags &= ~KVM_ARM64_SDEI_MASKED;
+		if (vsdei->pending)
+			kvm_make_request(KVM_REQ_SDEI, vcpu);
+	}
+
+	return SDEI_SUCCESS;
+}
+
 int kvm_sdei_call(struct kvm_vcpu *vcpu)
 {
 	struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
@@ -208,6 +223,12 @@ int kvm_sdei_call(struct kvm_vcpu *vcpu)
 	case SDEI_1_0_FN_SDEI_EVENT_GET_INFO:
 		ret = event_info(vcpu);
 		break;
+	case SDEI_1_0_FN_SDEI_PE_MASK:
+		ret = pe_mask(vcpu, true);
+		break;
+	case SDEI_1_0_FN_SDEI_PE_UNMASK:
+		ret = pe_mask(vcpu, false);
+		break;
 	default:
 		ret = SDEI_NOT_SUPPORTED;
 	}
-- 
2.23.0