// SPDX-License-Identifier: GPL-2.0-or-later /* * Hypervisor Maintenance Interrupt (HMI) handling. * * Copyright 2015 IBM Corporation * Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> */ #undef DEBUG #include <linux/types.h> #include <linux/compiler.h> #include <asm/paca.h> #include <asm/hmi.h> #include <asm/processor.h> void wait_for_subcore_guest_exit(void) { int i; /* * NULL bitmap pointer indicates that KVM module hasn't * been loaded yet and hence no guests are running. * If no KVM is in use, no need to co-ordinate among threads * as all of them will always be in host and no one is going * to modify TB other than the opal hmi handler. * Hence, just return from here. */ if (!local_paca->sibling_subcore_state) return; for (i = 0; i < MAX_SUBCORE_PER_CORE; i++) while (local_paca->sibling_subcore_state->in_guest[i]) cpu_relax(); } void wait_for_tb_resync(void) { if (!local_paca->sibling_subcore_state) return; while (test_bit(CORE_TB_RESYNC_REQ_BIT, &local_paca->sibling_subcore_state->flags)) cpu_relax(); }