linux-kernel - [PATCH v7 11/22] KVM: arm64: Support {PRIVATE, SHARED}

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Date:   Fri, 27 May 2022 16:02:42 +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 11/22] KVM: arm64: Support {PRIVATE, SHARED}_RESET hypercall

This supports {PRIVATE, SHARED}_RESET hypercall. There is nothing
to do if we're going to reset the shared events, which are not
supported. For the private events, their registered and enabled
state are cleared.

Signed-off-by: Gavin Shan <gshan@...hat.com>
---
 arch/arm64/kvm/sdei.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
index 6afa49b4f3c7..42ba6f97b168 100644
--- a/arch/arm64/kvm/sdei.c
+++ b/arch/arm64/kvm/sdei.c
@@ -184,6 +184,26 @@ static unsigned long pe_mask(struct kvm_vcpu *vcpu, bool mask)
 	return SDEI_SUCCESS;
 }
 
+static unsigned long event_reset(struct kvm_vcpu *vcpu, bool private)
+{
+	struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
+	unsigned int num;
+
+	/*
+	 * Nothing to do if we're going to reset the shared events,
+	 * which are unsupported.
+	 */
+	if (!private)
+		return SDEI_SUCCESS;
+
+	for (num = 0; num < KVM_NR_SDEI_EVENTS; num++) {
+		clear_bit(num, &vsdei->registered);
+		clear_bit(num, &vsdei->enabled);
+	}
+
+	return SDEI_SUCCESS;
+}
+
 int kvm_sdei_call(struct kvm_vcpu *vcpu)
 {
 	struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
@@ -229,6 +249,12 @@ int kvm_sdei_call(struct kvm_vcpu *vcpu)
 	case SDEI_1_0_FN_SDEI_PE_UNMASK:
 		ret = pe_mask(vcpu, false);
 		break;
+	case SDEI_1_0_FN_SDEI_PRIVATE_RESET:
+		ret = event_reset(vcpu, true);
+		break;
+	case SDEI_1_0_FN_SDEI_SHARED_RESET:
+		ret = event_reset(vcpu, false);
+		break;
 	default:
 		ret = SDEI_NOT_SUPPORTED;
 	}
-- 
2.23.0