1d5bb994bSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 27c379526SPaolo Bonzini /* 37c379526SPaolo Bonzini * Hypervisor Maintenance Interrupt (HMI) handling. 47c379526SPaolo Bonzini * 57c379526SPaolo Bonzini * Copyright 2015 IBM Corporation 67c379526SPaolo Bonzini * Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> 77c379526SPaolo Bonzini */ 87c379526SPaolo Bonzini 97c379526SPaolo Bonzini #undef DEBUG 107c379526SPaolo Bonzini 117c379526SPaolo Bonzini #include <linux/types.h> 127c379526SPaolo Bonzini #include <linux/compiler.h> 137c379526SPaolo Bonzini #include <asm/paca.h> 147c379526SPaolo Bonzini #include <asm/hmi.h> 1592ab45c5SChristophe Leroy #include <asm/processor.h> 167c379526SPaolo Bonzini 177c379526SPaolo Bonzini void wait_for_subcore_guest_exit(void) 187c379526SPaolo Bonzini { 197c379526SPaolo Bonzini int i; 207c379526SPaolo Bonzini 217c379526SPaolo Bonzini /* 227c379526SPaolo Bonzini * NULL bitmap pointer indicates that KVM module hasn't 237c379526SPaolo Bonzini * been loaded yet and hence no guests are running. 247c379526SPaolo Bonzini * If no KVM is in use, no need to co-ordinate among threads 257c379526SPaolo Bonzini * as all of them will always be in host and no one is going 267c379526SPaolo Bonzini * to modify TB other than the opal hmi handler. 277c379526SPaolo Bonzini * Hence, just return from here. 287c379526SPaolo Bonzini */ 297c379526SPaolo Bonzini if (!local_paca->sibling_subcore_state) 307c379526SPaolo Bonzini return; 317c379526SPaolo Bonzini 327c379526SPaolo Bonzini for (i = 0; i < MAX_SUBCORE_PER_CORE; i++) 337c379526SPaolo Bonzini while (local_paca->sibling_subcore_state->in_guest[i]) 347c379526SPaolo Bonzini cpu_relax(); 357c379526SPaolo Bonzini } 367c379526SPaolo Bonzini 377c379526SPaolo Bonzini void wait_for_tb_resync(void) 387c379526SPaolo Bonzini { 397c379526SPaolo Bonzini if (!local_paca->sibling_subcore_state) 407c379526SPaolo Bonzini return; 417c379526SPaolo Bonzini 427c379526SPaolo Bonzini while (test_bit(CORE_TB_RESYNC_REQ_BIT, 437c379526SPaolo Bonzini &local_paca->sibling_subcore_state->flags)) 447c379526SPaolo Bonzini cpu_relax(); 457c379526SPaolo Bonzini } 46