[PATCH 30/60] kvm: Add KVM_EXIT_PLANE_EVENT

[Jörg Rödel]

From: Paolo Bonzini <pbonzini@xxxxxxxxxx>

Add a new exit-type to KVM for telling user-space that a plane-vcpu is
missing. Create a helper which fills out the kvm_run exit structure.

Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Co-developed-by: Joerg Roedel <joerg.roedel@xxxxxxx>
Signed-off-by: Joerg Roedel <joerg.roedel@xxxxxxx>
---
 include/linux/kvm_host.h |  2 ++
 include/uapi/linux/kvm.h | 10 ++++++++++
 virt/kvm/kvm_main.c      | 12 ++++++++++++
 3 files changed, 24 insertions(+)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 3ecd472c7cfa..90b97137840e 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1649,6 +1649,8 @@ void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu);
 void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu);
 bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu);
 
+int kvm_request_create_plane(struct kvm_vcpu *vcpu, unsigned plane, u64 apic_id);
+
 #ifndef CONFIG_S390
 void __kvm_vcpu_kick(struct kvm_vcpu *vcpu, bool wait);
 
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 24e34b8e4819..a88d987c7882 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -146,6 +146,13 @@ struct kvm_exit_snp_req_certs {
 	__u64 ret;
 };
 
+struct kvm_plane_event_exit {
+#define KVM_PLANE_EVENT_CREATE_VCPU	1
+	__u32 cause;
+	__u32 plane;
+	__u64 extra[8];
+};
+
 #define KVM_S390_GET_SKEYS_NONE   1
 #define KVM_S390_SKEYS_MAX        1048576
 
@@ -193,6 +200,7 @@ struct kvm_exit_snp_req_certs {
 #define KVM_EXIT_ARM_SEA          41
 #define KVM_EXIT_ARM_LDST64B      42
 #define KVM_EXIT_SNP_REQ_CERTS    43
+#define KVM_EXIT_PLANE_EVENT      44
 
 /* For KVM_EXIT_INTERNAL_ERROR */
 /* Emulate instruction failed. */
@@ -497,6 +505,8 @@ struct kvm_run {
 		} arm_sea;
 		/* KVM_EXIT_SNP_REQ_CERTS */
 		struct kvm_exit_snp_req_certs snp_req_certs;
+		/* KVM_EXIT_PLANE_EVENT */
+		struct kvm_plane_event_exit plane_event;
 		/* Fix the size of the union. */
 		char padding[256];
 	};
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 03a44ff62f0f..f0f78bb74e51 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -3973,6 +3973,18 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
 }
 EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_vcpu_wake_up);
 
+int kvm_request_create_plane(struct kvm_vcpu *vcpu, unsigned plane, u64 apic_id)
+{
+	vcpu->run->exit_reason = KVM_EXIT_PLANE_EVENT;
+	memset(&vcpu->run->plane_event, 0, sizeof(vcpu->run->plane_event));
+	vcpu->run->plane_event.cause = KVM_PLANE_EVENT_CREATE_VCPU;
+	vcpu->run->plane_event.plane = plane;
+	vcpu->run->plane_event.extra[0] = apic_id;
+
+	return 0;
+}
+EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_request_create_plane);
+
 #ifndef CONFIG_S390
 /*
  * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
-- 
2.53.0