diff options
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv_hmi.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv_hmi.c | 22 |
1 files changed, 8 insertions, 14 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_hmi.c b/arch/powerpc/kvm/book3s_hv_hmi.c index e3f738eb1cac..1ec50c69678b 100644 --- a/arch/powerpc/kvm/book3s_hv_hmi.c +++ b/arch/powerpc/kvm/book3s_hv_hmi.c @@ -1,19 +1,7 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * Hypervisor Maintenance Interrupt (HMI) handling. * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. - * * Copyright 2015 IBM Corporation * Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> */ @@ -24,6 +12,7 @@ #include <linux/compiler.h> #include <asm/paca.h> #include <asm/hmi.h> +#include <asm/processor.h> void wait_for_subcore_guest_exit(void) { @@ -31,10 +20,15 @@ void wait_for_subcore_guest_exit(void) /* * NULL bitmap pointer indicates that KVM module hasn't - * been loaded yet and hence no guests are running. + * been loaded yet and hence no guests are running, or running + * on POWER9 or newer CPU. + * * 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. + * + * POWER9 and newer don't need this synchronisation. + * * Hence, just return from here. */ if (!local_paca->sibling_subcore_state) |