KVM: Provide userspace IO exit completion callback

Current code assumes that IO exit was due to instruction emulation
and handles execution back to emulator directly. This patch adds new
userspace IO exit completion callback that can be set by any other code
that caused IO exit to userspace.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index fc0e752e7564..64adb6117e19 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -414,6 +414,7 @@ struct kvm_vcpu_arch {
         struct x86_emulate_ctxt emulate_ctxt;
         bool emulate_regs_need_sync_to_vcpu;
         bool emulate_regs_need_sync_from_vcpu;
+        int (*complete_userspace_io)(struct kvm_vcpu *vcpu);
 
         gpa_t time;
         struct pvclock_vcpu_time_info hv_clock;