From 647dc49eebad2c30f823cae2bd8204b66c739f9c Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Thu, 1 Apr 2010 14:39:21 +0300 Subject: [PATCH] KVM: Document replacements for KVM_EXIT_HYPERCALL Signed-off-by: Avi Kivity --- Documentation/kvm/api.txt | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) 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 { -- 2.20.1