linux-kernel - [PATCH v5 03/22] KVM: arm64: Support SDEI

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Date:   Tue, 22 Mar 2022 16:06:51 +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 03/22] KVM: arm64: Support SDEI_VERSION hypercall

This supports SDEI_VERSION hypercall by returning v1.1, which is
the specification version we're following. The vendor is set to
'KVM'.

Signed-off-by: Gavin Shan <gshan@...hat.com>
---
 arch/arm64/kvm/sdei.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
index 8a9b477b8977..5a3a64cd6e84 100644
--- a/arch/arm64/kvm/sdei.c
+++ b/arch/arm64/kvm/sdei.c
@@ -118,6 +118,14 @@ static bool remove_all_vcpu_events(struct kvm_vcpu *vcpu,
 	return pending;
 }
 
+static unsigned long hypercall_version(struct kvm_vcpu *vcpu)
+{
+	/* v1.1 and the vendor is KVM */
+	return (1UL << SDEI_VERSION_MAJOR_SHIFT) |
+	       (1UL << SDEI_VERSION_MINOR_SHIFT) |
+	       0x4b564d;
+}
+
 int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
 {
 	struct kvm *kvm = vcpu->kvm;
@@ -142,6 +150,8 @@ int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
 
 	switch (func) {
 	case SDEI_1_0_FN_SDEI_VERSION:
+		ret = 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