[PATCH v5 20/22] KVM: arm64: Export SDEI capability

[Gavin Shan <gshan@redhat.com>]

The SDEI functionality is ready to be exported so far. This adds
new capability (KVM_CAP_ARM_SDEI) and exports it.

Signed-off-by: Gavin Shan <gshan@redhat.com>
---
 Documentation/virt/kvm/api.rst | 10 ++++++++++
 arch/arm64/kvm/arm.c           |  3 +++
 include/uapi/linux/kvm.h       |  1 +
 3 files changed, 14 insertions(+)

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 9f3172376ec3..06cf27f37b4d 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -7575,3 +7575,13 @@ The argument to KVM_ENABLE_CAP is also a bitmask, and must be a subset
 of the result of KVM_CHECK_EXTENSION.  KVM will forward to userspace
 the hypercalls whose corresponding bit is in the argument, and return
 ENOSYS for the others.
+
+8.35 KVM_CAP_ARM_SDEI
+---------------------
+
+:Capability: KVM_CAP_ARM_SDEI
+:Architectures: arm64
+
+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.
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 3f532e1c4a95..ae3b53dfe88f 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -282,6 +282,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_ARM_PTRAUTH_GENERIC:
 		r = system_has_full_ptr_auth();
 		break;
+	case KVM_CAP_ARM_SDEI:
+		r = 1;
+		break;
 	default:
 		r = 0;
 	}
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 2d11c909ec42..5772385639b8 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1135,6 +1135,7 @@ struct kvm_ppc_resize_hpt {
 #define KVM_CAP_XSAVE2 208
 #define KVM_CAP_SYS_ATTRIBUTES 209
 #define KVM_CAP_PPC_AIL_MODE_3 210
+#define KVM_CAP_ARM_SDEI 211
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
-- 
2.23.0