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KVM: Document replacements for KVM_EXIT_HYPERCALL
[safe/jmp/linux-2.6]
/
Documentation
/
kvm
/
api.txt
diff --git
a/Documentation/kvm/api.txt
b/Documentation/kvm/api.txt
index
6f36235
..
baa8fde
100644
(file)
--- a/
Documentation/kvm/api.txt
+++ b/
Documentation/kvm/api.txt
@@
-974,7
+974,9
@@
pending operations.
__u32 pad;
} hypercall;
__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 {
/* KVM_EXIT_TPR_ACCESS */
struct {