Fix non-deterministic delays when accessing a vcpu that was in "running" or

"sleeping" state. This is done by forcing the vcpu to transition to "idle"
by returning to userspace with an exit code of VM_EXITCODE_REQIDLE.

MFC after:      2 weeks

1 files changed, 9 insertions, 3 deletions

diff --git a/sys/amd64/vmm/amd/svm.c b/sys/amd64/vmm/amd/svm.c
index 20e8f76..53b12b7 100644
--- a/sys/amd64/vmm/amd/svm.c
+++ b/sys/amd64/vmm/amd/svm.c
@@ -1900,7 +1900,7 @@ enable_gintr(void)
  */
 static int
 svm_vmrun(void *arg, int vcpu, register_t rip, pmap_t pmap, 
-	void *rend_cookie, void *suspended_cookie)
+	struct vm_eventinfo *evinfo)
 {
 	struct svm_regctx *gctx;
 	struct svm_softc *svm_sc;
@@ -1975,18 +1975,24 @@ svm_vmrun(void *arg, int vcpu, register_t rip, pmap_t pmap,
 		 */
 		disable_gintr();
 
-		if (vcpu_suspended(suspended_cookie)) {
+		if (vcpu_suspended(evinfo)) {
 			enable_gintr();
 			vm_exit_suspended(vm, vcpu, state->rip);
 			break;
 		}
 
-		if (vcpu_rendezvous_pending(rend_cookie)) {
+		if (vcpu_rendezvous_pending(evinfo)) {
 			enable_gintr();
 			vm_exit_rendezvous(vm, vcpu, state->rip);
 			break;
 		}
 
+		if (vcpu_reqidle(evinfo)) {
+			enable_gintr();
+			vm_exit_reqidle(vm, vcpu, state->rip);
+			break;
+		}
+
 		/* We are asked to give the cpu by scheduler. */
 		if (vcpu_should_yield(vm, vcpu)) {
 			enable_gintr();