From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [103.22.144.67]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 26A531A1A0D for ; Fri, 18 Dec 2015 07:59:37 +1100 (AEDT) Received: from e38.co.us.ibm.com (e38.co.us.ibm.com [32.97.110.159]) (using TLSv1 with cipher CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 646D3140BA4 for ; Fri, 18 Dec 2015 07:59:36 +1100 (AEDT) Received: from localhost by e38.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 17 Dec 2015 13:59:34 -0700 Received: from b03cxnp07029.gho.boulder.ibm.com (b03cxnp07029.gho.boulder.ibm.com [9.17.130.16]) by d03dlp02.boulder.ibm.com (Postfix) with ESMTP id C432A3E4003F for ; Thu, 17 Dec 2015 13:59:32 -0700 (MST) Received: from d03av02.boulder.ibm.com (d03av02.boulder.ibm.com [9.17.195.168]) by b03cxnp07029.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id tBHKxW6R25428118 for ; Thu, 17 Dec 2015 13:59:32 -0700 Received: from d03av02.boulder.ibm.com (localhost [127.0.0.1]) by d03av02.boulder.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id tBHKxWCV015269 for ; Thu, 17 Dec 2015 13:59:32 -0700 From: Suresh Warrier To: kvm@vger.kernel.org, linuxppc-dev@ozlabs.org Cc: warrier@linux.vnet.ibm.com, paulus@samba.org, agraf@suse.de, mpe@ellerman.id.au Subject: [PATCH v3 6/9] KVM: PPC: Book3S HV: kvmppc_host_rm_ops - handle offlining CPUs Date: Thu, 17 Dec 2015 14:59:08 -0600 Message-Id: <1450385951-25128-7-git-send-email-warrier@linux.vnet.ibm.com> In-Reply-To: <1450385951-25128-1-git-send-email-warrier@linux.vnet.ibm.com> References: <1450385951-25128-1-git-send-email-warrier@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , The kvmppc_host_rm_ops structure keeps track of which cores are are in the host by maintaining a bitmask of active/runnable online CPUs that have not entered the guest. This patch adds support to manage the bitmask when a CPU is offlined or onlined in the host. Signed-off-by: Suresh Warrier --- arch/powerpc/kvm/book3s_hv.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 95a2ed3..da2cc56 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -3012,6 +3012,36 @@ static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu) } #ifdef CONFIG_KVM_XICS +static int kvmppc_cpu_notify(struct notifier_block *self, unsigned long action, + void *hcpu) +{ + unsigned long cpu = (long)hcpu; + + switch (action) { + case CPU_UP_PREPARE: + case CPU_UP_PREPARE_FROZEN: + kvmppc_set_host_core(cpu); + break; + +#ifdef CONFIG_HOTPLUG_CPU + case CPU_DEAD: + case CPU_DEAD_FROZEN: + case CPU_UP_CANCELED: + case CPU_UP_CANCELED_FROZEN: + kvmppc_clear_host_core(cpu); + break; +#endif + default: + break; + } + + return NOTIFY_OK; +} + +static struct notifier_block kvmppc_cpu_notifier = { + .notifier_call = kvmppc_cpu_notify, +}; + /* * Allocate a per-core structure for managing state about which cores are * running in the host versus the guest and for exchanging data between @@ -3045,6 +3075,8 @@ void kvmppc_alloc_host_rm_ops(void) return; } + get_online_cpus(); + for (cpu = 0; cpu < nr_cpu_ids; cpu += threads_per_core) { if (!cpu_online(cpu)) continue; @@ -3063,14 +3095,21 @@ void kvmppc_alloc_host_rm_ops(void) l_ops = (unsigned long) ops; if (cmpxchg64((unsigned long *)&kvmppc_host_rm_ops_hv, 0, l_ops)) { + put_online_cpus(); kfree(ops->rm_core); kfree(ops); + return; } + + register_cpu_notifier(&kvmppc_cpu_notifier); + + put_online_cpus(); } void kvmppc_free_host_rm_ops(void) { if (kvmppc_host_rm_ops_hv) { + unregister_cpu_notifier(&kvmppc_cpu_notifier); kfree(kvmppc_host_rm_ops_hv->rm_core); kfree(kvmppc_host_rm_ops_hv); kvmppc_host_rm_ops_hv = NULL; -- 1.8.3.4