1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/kvm/api.txt b/Documentation/kvm/api.txt
index 6f362356e738..baa8fde8bd16 100644
--- a/Documentation/kvm/api.txt
+++ b/Documentation/kvm/api.txt
@@ -974,7 +974,9 @@ pending operations.
                        __u32 pad;
                } hypercall;
-Unused.
+Unused.  This was once used for 'hypercall to userspace'.  To implement
+such functionality, use KVM_EXIT_IO (x86) or KVM_EXIT_MMIO (all except s390).
+Note KVM_EXIT_IO is significantly faster than KVM_EXIT_MMIO.
                /* KVM_EXIT_TPR_ACCESS */
                struct {

diff --git a/Documentation/kvm/api.txt b/Documentation/kvm/api.txt index 6f362356e738..baa8fde8bd16 100644 --- a/Documentation/kvm/api.txt +++ b/Documentation/kvm/api.txt
@@ -974,7 +974,9 @@ pending operations.
974	__u32 pad;	974	__u32 pad;
975	} hypercall;	975	} hypercall;
976		976
977	Unused.	977	Unused. This was once used for 'hypercall to userspace'. To implement
		978	such functionality, use KVM_EXIT_IO (x86) or KVM_EXIT_MMIO (all except s390).
		979	Note KVM_EXIT_IO is significantly faster than KVM_EXIT_MMIO.
978		980
979	/* KVM_EXIT_TPR_ACCESS */	981	/* KVM_EXIT_TPR_ACCESS */
980	struct {	982	struct {