From patchwork Fri Sep 21 05:36:56 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Mackerras X-Patchwork-Id: 1489481 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 302F73FCFC for ; Fri, 21 Sep 2012 05:39:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754812Ab2IUFjo (ORCPT ); Fri, 21 Sep 2012 01:39:44 -0400 Received: from ozlabs.org ([203.10.76.45]:52798 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754187Ab2IUFjj (ORCPT ); Fri, 21 Sep 2012 01:39:39 -0400 Received: by ozlabs.org (Postfix, from userid 1003) id 3EA322C0089; Fri, 21 Sep 2012 15:39:38 +1000 (EST) Date: Fri, 21 Sep 2012 15:36:56 +1000 From: Paul Mackerras To: Alexander Graf Cc: kvm@vger.kernel.org, kvm-ppc@vger.kernel.org Subject: [PATCH 05/10] KVM: PPC: Book3S HV: Fix some races in starting secondary threads Message-ID: <20120921053656.GF15685@drongo> References: <20120921051606.GA15685@drongo> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20120921051606.GA15685@drongo> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Subsequent patches implementing in-kernel XICS emulation will make it possible for IPIs to arrive at secondary threads at arbitrary times. This fixes some races in how we start the secondary threads, which if not fixed could lead to occasional crashes of the host kernel. This makes sure that (a) we have grabbed all the secondary threads, and verified that they are no longer in the kernel, before we start any thread, (b) that the secondary thread loads its vcpu pointer after clearing the IPI that woke it up (so we don't miss a wakeup), and (c) that the secondary thread clears its vcpu pointer before incrementing the nap count. It also removes unnecessary setting of the vcpu and vcore pointers in the paca in kvmppc_core_vcpu_load. Signed-off-by: Paul Mackerras --- arch/powerpc/kvm/book3s_hv.c | 41 ++++++++++++++++++------------- arch/powerpc/kvm/book3s_hv_rmhandlers.S | 11 ++++++--- 2 files changed, 32 insertions(+), 20 deletions(-) diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index a917603..cd3dc12 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -64,8 +64,6 @@ void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu) { struct kvmppc_vcore *vc = vcpu->arch.vcore; - local_paca->kvm_hstate.kvm_vcpu = vcpu; - local_paca->kvm_hstate.kvm_vcore = vc; if (vc->runner == vcpu && vc->vcore_state != VCORE_INACTIVE) vc->stolen_tb += mftb() - vc->preempt_tb; } @@ -776,6 +774,7 @@ static int kvmppc_grab_hwthread(int cpu) /* Ensure the thread won't go into the kernel if it wakes */ tpaca->kvm_hstate.hwthread_req = 1; + tpaca->kvm_hstate.kvm_vcpu = NULL; /* * If the thread is already executing in the kernel (e.g. handling @@ -825,7 +824,6 @@ static void kvmppc_start_thread(struct kvm_vcpu *vcpu) smp_wmb(); #if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP) if (vcpu->arch.ptid) { - kvmppc_grab_hwthread(cpu); xics_wake_cpu(cpu); ++vc->n_woken; } @@ -851,7 +849,8 @@ static void kvmppc_wait_for_nap(struct kvmppc_vcore *vc) /* * Check that we are on thread 0 and that any other threads in - * this core are off-line. + * this core are off-line. Then grab the threads so they can't + * enter the kernel. */ static int on_primary_thread(void) { @@ -863,6 +862,17 @@ static int on_primary_thread(void) while (++thr < threads_per_core) if (cpu_online(cpu + thr)) return 0; + + /* Grab all hw threads so they can't go into the kernel */ + for (thr = 1; thr < threads_per_core; ++thr) { + if (kvmppc_grab_hwthread(cpu + thr)) { + /* Couldn't grab one; let the others go */ + do { + kvmppc_release_hwthread(cpu + thr); + } while (--thr > 0); + return 0; + } + } return 1; } @@ -911,16 +921,6 @@ static int kvmppc_run_core(struct kvmppc_vcore *vc) } /* - * Make sure we are running on thread 0, and that - * secondary threads are offline. - */ - if (threads_per_core > 1 && !on_primary_thread()) { - list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) - vcpu->arch.ret = -EBUSY; - goto out; - } - - /* * Assign physical thread IDs, first to non-ceded vcpus * and then to ceded ones. */ @@ -939,15 +939,22 @@ static int kvmppc_run_core(struct kvmppc_vcore *vc) if (vcpu->arch.ceded) vcpu->arch.ptid = ptid++; + /* + * Make sure we are running on thread 0, and that + * secondary threads are offline. + */ + if (threads_per_core > 1 && !on_primary_thread()) { + list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) + vcpu->arch.ret = -EBUSY; + goto out; + } + vc->stolen_tb += mftb() - vc->preempt_tb; vc->pcpu = smp_processor_id(); list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) { kvmppc_start_thread(vcpu); kvmppc_create_dtl_entry(vcpu, vc); } - /* Grab any remaining hw threads so they can't go into the kernel */ - for (i = ptid; i < threads_per_core; ++i) - kvmppc_grab_hwthread(vc->pcpu + i); preempt_disable(); spin_unlock(&vc->lock); diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index 44b72fe..1e90ef6 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -134,8 +134,11 @@ kvm_start_guest: 27: /* XXX should handle hypervisor maintenance interrupts etc. here */ + /* reload vcpu pointer after clearing the IPI */ + ld r4,HSTATE_KVM_VCPU(r13) + cmpdi r4,0 /* if we have no vcpu to run, go back to sleep */ - beq cr1,kvm_no_guest + beq kvm_no_guest /* were we napping due to cede? */ lbz r0,HSTATE_NAPPING(r13) @@ -1587,6 +1590,10 @@ secondary_too_late: .endr secondary_nap: + /* Clear our vcpu pointer so we don't come back in early */ + li r0, 0 + std r0, HSTATE_KVM_VCPU(r13) + lwsync /* Clear any pending IPI - assume we're a secondary thread */ ld r5, HSTATE_XICS_PHYS(r13) li r7, XICS_XIRR @@ -1612,8 +1619,6 @@ secondary_nap: kvm_no_guest: li r0, KVM_HWTHREAD_IN_NAP stb r0, HSTATE_HWTHREAD_STATE(r13) - li r0, 0 - std r0, HSTATE_KVM_VCPU(r13) li r3, LPCR_PECE0 mfspr r4, SPRN_LPCR