[PATCH RFC v8 40/56] KVM: SVM: Add KVM_EXIT_VMGEXIT

[Michael Roth <michael.roth@amd.com>]

For private memslots, GHCB page state change requests will be forwarded
to userspace for processing. Define a new KVM_EXIT_VMGEXIT for exits of
this type.

Signed-off-by: Michael Roth <michael.roth@amd.com>
---
 include/uapi/linux/kvm.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 2bab08a5b5d7..6e684bf5f723 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -279,6 +279,7 @@ struct kvm_xen_exit {
 #define KVM_EXIT_RISCV_CSR        36
 #define KVM_EXIT_NOTIFY           37
 #define KVM_EXIT_MEMORY_FAULT     38
+#define KVM_EXIT_VMGEXIT          50
 
 /* For KVM_EXIT_INTERNAL_ERROR */
 /* Emulate instruction failed. */
@@ -527,6 +528,11 @@ struct kvm_run {
 			__u64 gpa;
 			__u64 size;
 		} memory;
+		/* KVM_EXIT_VMGEXIT */
+		struct {
+			__u64 ghcb_msr; /* GHCB MSR contents */
+			__u8 error; /* user -> kernel */
+		} vmgexit;
 		/* Fix the size of the union. */
 		char padding[256];
 	};
-- 
2.25.1