linux-kernel - [PATCH v6 17/18] KVM: arm64: Expose SDEI capability

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Date:   Sun,  3 Apr 2022 23:39:10 +0800
From:   Gavin Shan <gshan@...hat.com>
To:     kvmarm@...ts.cs.columbia.edu
Cc:     linux-kernel@...r.kernel.org, eauger@...hat.com, oupton@...gle.com,
        Jonathan.Cameron@...wei.com, vkuznets@...hat.com, will@...nel.org,
        shannon.zhaosl@...il.com, james.morse@....com,
        mark.rutland@....com, maz@...nel.org, pbonzini@...hat.com,
        shan.gavin@...il.com
Subject: [PATCH v6 17/18] KVM: arm64: Expose SDEI capability

The SDEI functionality is ready to be exposed. This adds new capability
(KVM_CAP_ARM_SDEI) and exposes it. VMM needs this to add ACPI table for
SDEI so that the service can be detected from the guest kernel.

Signed-off-by: Gavin Shan <gshan@...hat.com>
---
 Documentation/virt/kvm/api.rst | 11 +++++++++++
 arch/arm64/kvm/arm.c           |  1 +
 include/uapi/linux/kvm.h       |  1 +
 3 files changed, 13 insertions(+)

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index d13fa6600467..59b94a24a490 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -7723,6 +7723,17 @@ At this time, KVM_PMU_CAP_DISABLE is the only capability.  Setting
 this capability will disable PMU virtualization for that VM.  Usermode
 should adjust CPUID leaf 0xA to reflect that the PMU is disabled.
 
+8.36 KVM_CAP_ARM_SDEI
+---------------------
+
+:Capability: KVM_CAP_ARM_SDEI
+:Architectures: arm64
+:Type: vm
+
+This capability indicates that the SDEI virtual service is supported
+in the host. A VMM can check whether the service is available to enable
+it.
+
 9. Known KVM API problems
 =========================
 
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 7e77d62aeab1..8117a9e974f0 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -211,6 +211,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_SET_GUEST_DEBUG:
 	case KVM_CAP_VCPU_ATTRIBUTES:
 	case KVM_CAP_PTP_KVM:
+	case KVM_CAP_ARM_SDEI:
 		r = 1;
 		break;
 	case KVM_CAP_SET_GUEST_DEBUG2:
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 91a6fe4e02c0..a5474265c841 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1144,6 +1144,7 @@ struct kvm_ppc_resize_hpt {
 #define KVM_CAP_S390_MEM_OP_EXTENSION 211
 #define KVM_CAP_PMU_CAPABILITY 212
 #define KVM_CAP_DISABLE_QUIRKS2 213
+#define KVM_CAP_ARM_SDEI 214
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
-- 
2.23.0