From patchwork Fri Jun 17 06:36:36 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Gibson X-Patchwork-Id: 636804 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3rW9dt2sgYz9s65 for ; Fri, 17 Jun 2016 16:41:54 +1000 (AEST) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=gibson.dropbear.id.au header.i=@gibson.dropbear.id.au header.b=eXHpzFHf; dkim-atps=neutral Received: from localhost ([::1]:54227 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bDnTU-0003jo-AB for incoming@patchwork.ozlabs.org; Fri, 17 Jun 2016 02:41:52 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50369) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bDnN2-0005b1-Ny for qemu-devel@nongnu.org; Fri, 17 Jun 2016 02:35:14 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bDnMz-0008Gp-Kt for qemu-devel@nongnu.org; Fri, 17 Jun 2016 02:35:11 -0400 Received: from ozlabs.org ([103.22.144.67]:45507) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bDnMz-0008CU-1c; Fri, 17 Jun 2016 02:35:09 -0400 Received: by ozlabs.org (Postfix, from userid 1007) id 3rW9Tv37nkz9t2J; Fri, 17 Jun 2016 16:34:58 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gibson.dropbear.id.au; s=201602; t=1466145299; bh=qRXO1UK+1y+pAnWO64fA15fx5XBvwi9gxNh4xt8sXxE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eXHpzFHf7suiNlvzEx53/Qaso3vx7ZNzDA0Q+8r2lEzbP9IIZtjuOs8Ci1sADA5Nx xEUiiZvklPEbFrgqK+NR8NveFZrjNa7Oclov4xWfcjyXwNvBkthw04NxaCi6QL8BGt 701NjFJ21aLmEINDrgRuRLLwMjx3HgPkb+fbCSG4= From: David Gibson To: peter.maydell@linaro.org Date: Fri, 17 Jun 2016 16:36:36 +1000 Message-Id: <1466145399-32209-16-git-send-email-david@gibson.dropbear.id.au> X-Mailer: git-send-email 2.5.5 In-Reply-To: <1466145399-32209-1-git-send-email-david@gibson.dropbear.id.au> References: <1466145399-32209-1-git-send-email-david@gibson.dropbear.id.au> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 103.22.144.67 Subject: [Qemu-devel] [PULL 15/18] spapr: CPU hot unplug support X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-devel@nongnu.org, aik@ozlabs.ru, mdroth@linux.vnet.ibm.com, agraf@suse.de, qemu-ppc@nongnu.org, bharata@linux.vnet.ibm.com, imammedo@redhat.com, David Gibson Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Bharata B Rao Remove the CPU core device by removing the underlying CPU thread devices. Hot removal of CPU for sPAPR guests is achieved by sending the hot unplug notification to the guest. Release the vCPU object after CPU hot unplug so that vCPU fd can be parked and reused. Signed-off-by: Bharata B Rao Signed-off-by: David Gibson --- hw/ppc/spapr.c | 8 ++++++ hw/ppc/spapr_cpu_core.c | 59 +++++++++++++++++++++++++++++++++++++++++ include/hw/ppc/spapr_cpu_core.h | 2 ++ 3 files changed, 69 insertions(+) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index c444a86..1dcb9f6 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -2313,8 +2313,16 @@ static void spapr_machine_device_plug(HotplugHandler *hotplug_dev, static void spapr_machine_device_unplug(HotplugHandler *hotplug_dev, DeviceState *dev, Error **errp) { + sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(qdev_get_machine()); + if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) { error_setg(errp, "Memory hot unplug not supported by sPAPR"); + } else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_CPU_CORE)) { + if (!smc->dr_cpu_enabled) { + error_setg(errp, "CPU hot unplug not supported on this machine"); + return; + } + spapr_core_unplug(hotplug_dev, dev, errp); } } diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c index d5fa4e6..3a5da09 100644 --- a/hw/ppc/spapr_cpu_core.c +++ b/hw/ppc/spapr_cpu_core.c @@ -38,6 +38,14 @@ static void spapr_cpu_reset(void *opaque) &error_fatal); } +static void spapr_cpu_destroy(PowerPCCPU *cpu) +{ + sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine()); + + xics_cpu_destroy(spapr->icp, cpu); + qemu_unregister_reset(spapr_cpu_reset, cpu); +} + void spapr_cpu_init(sPAPRMachineState *spapr, PowerPCCPU *cpu, Error **errp) { CPUPPCState *env = &cpu->env; @@ -88,6 +96,57 @@ char *spapr_get_cpu_core_type(const char *model) return core_type; } +static void spapr_core_release(DeviceState *dev, void *opaque) +{ + sPAPRCPUCore *sc = SPAPR_CPU_CORE(OBJECT(dev)); + const char *typename = object_class_get_name(sc->cpu_class); + size_t size = object_type_get_instance_size(typename); + sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine()); + sPAPRCPUCore *core = SPAPR_CPU_CORE(OBJECT(dev)); + CPUCore *cc = CPU_CORE(dev); + int smt = kvmppc_smt_threads(); + int i; + + for (i = 0; i < cc->nr_threads; i++) { + void *obj = sc->threads + i * size; + DeviceState *dev = DEVICE(obj); + CPUState *cs = CPU(dev); + PowerPCCPU *cpu = POWERPC_CPU(cs); + + spapr_cpu_destroy(cpu); + cpu_remove_sync(cs); + object_unparent(obj); + } + + spapr->cores[cc->core_id / smt] = NULL; + + g_free(core->threads); + object_unparent(OBJECT(dev)); +} + +void spapr_core_unplug(HotplugHandler *hotplug_dev, DeviceState *dev, + Error **errp) +{ + sPAPRCPUCore *core = SPAPR_CPU_CORE(OBJECT(dev)); + PowerPCCPU *cpu = POWERPC_CPU(core->threads); + int id = ppc_get_vcpu_dt_id(cpu); + sPAPRDRConnector *drc = + spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_CPU, id); + sPAPRDRConnectorClass *drck; + Error *local_err = NULL; + + g_assert(drc); + + drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc); + drck->detach(drc, dev, spapr_core_release, NULL, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + + spapr_hotplug_req_remove_by_index(drc); +} + void spapr_core_plug(HotplugHandler *hotplug_dev, DeviceState *dev, Error **errp) { diff --git a/include/hw/ppc/spapr_cpu_core.h b/include/hw/ppc/spapr_cpu_core.h index 7cb0515..1c9b319 100644 --- a/include/hw/ppc/spapr_cpu_core.h +++ b/include/hw/ppc/spapr_cpu_core.h @@ -31,4 +31,6 @@ void spapr_core_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev, char *spapr_get_cpu_core_type(const char *model); void spapr_core_plug(HotplugHandler *hotplug_dev, DeviceState *dev, Error **errp); +void spapr_core_unplug(HotplugHandler *hotplug_dev, DeviceState *dev, + Error **errp); #endif