D21978.diff
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	Index: head/sys/amd64/vmm/vmm.c
	===================================================================
	--- head/sys/amd64/vmm/vmm.c
	+++ head/sys/amd64/vmm/vmm.c
	@@ -1235,22 +1235,6 @@
	panic("Error %d setting state to %d", error, newstate);
	}

	-static void
	-vm_set_rendezvous_func(struct vm *vm, vm_rendezvous_func_t func)
	-{
	-
	- KASSERT(mtx_owned(&vm->rendezvous_mtx), ("rendezvous_mtx not locked"));
	-
	- /*
	- * Update 'rendezvous_func' and execute a write memory barrier to
	- * ensure that it is visible across all host cpus. This is not needed
	- * for correctness but it does ensure that all the vcpus will notice
	- * that the rendezvous is requested immediately.
	- */
	- vm->rendezvous_func = func;
	- wmb();
	-}
	-
	#define RENDEZVOUS_CTR0(vm, vcpuid, fmt) \
	do { \
	if (vcpuid >= 0) \
	@@ -1281,7 +1265,7 @@
	if (CPU_CMP(&vm->rendezvous_req_cpus,
	&vm->rendezvous_done_cpus) == 0) {
	VCPU_CTR0(vm, vcpuid, "Rendezvous completed");
	- vm_set_rendezvous_func(vm, NULL);
	+ vm->rendezvous_func = NULL;
	wakeup(&vm->rendezvous_func);
	break;
	}
	@@ -2535,7 +2519,7 @@
	vm->rendezvous_req_cpus = dest;
	CPU_ZERO(&vm->rendezvous_done_cpus);
	vm->rendezvous_arg = arg;
	- vm_set_rendezvous_func(vm, func);
	+ vm->rendezvous_func = func;
	mtx_unlock(&vm->rendezvous_mtx);

	/*