From: Gavin Shan <gshan@redhat.com>
To: Salil Mehta <salil.mehta@huawei.com>,
qemu-devel@nongnu.org, qemu-arm@nongnu.org
Cc: maz@kernel.org, jean-philippe@linaro.org,
jonathan.cameron@huawei.com, lpieralisi@kernel.org,
peter.maydell@linaro.org, richard.henderson@linaro.org,
imammedo@redhat.com, andrew.jones@linux.dev, david@redhat.com,
philmd@linaro.org, eric.auger@redhat.com, will@kernel.org,
ardb@kernel.org, oliver.upton@linux.dev, pbonzini@redhat.com,
mst@redhat.com, rafael@kernel.org, borntraeger@linux.ibm.com,
alex.bennee@linaro.org, linux@armlinux.org.uk,
darren@os.amperecomputing.com, ilkka@os.amperecomputing.com,
vishnu@os.amperecomputing.com, karl.heubaum@oracle.com,
miguel.luis@oracle.com, salil.mehta@opnsrc.net,
zhukeqian1@huawei.com, wangxiongfeng2@huawei.com,
wangyanan55@huawei.com, jiakernel2@gmail.com,
maobibo@loongson.cn, lixianglai@loongson.cn
Subject: Re: [PATCH RFC V2 25/37] arm/virt: Add/update basic hot-(un)plug framework
Date: Fri, 29 Sep 2023 10:20:56 +1000 [thread overview]
Message-ID: <f18990cd-c211-4c23-aecb-0aec076bc19b@redhat.com> (raw)
In-Reply-To: <20230926100436.28284-26-salil.mehta@huawei.com>
Hi Salil,
On 9/26/23 20:04, Salil Mehta wrote:
> Add CPU hot-unplug hooks and update hotplug hooks with additional sanity checks
> for use in hotplug paths.
>
> Note, Functional contents of the hooks(now left with TODO comment) shall be
> gradually filled in the subsequent patches in an incremental approach to patch
> and logic building which would be roughly as follows:
> 1. (Un-)wiring of interrupts between vCPU<->GIC
> 2. Sending events to Guest for hot-(un)plug so that guest can take appropriate
> actions.
> 3. Notifying GIC about hot-(un)plug action so that vCPU could be (un-)stitched
> to the GIC CPU interface.
> 4. Updating the Guest with Next boot info for this vCPU in the firmware.
>
> Co-developed-by: Salil Mehta <salil.mehta@huawei.com>
> Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
> Co-developed-by: Keqian Zhu <zhukeqian1@huawei.com>
> Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
> Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
> ---
> hw/arm/virt.c | 104 ++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 104 insertions(+)
>
> diff --git a/hw/arm/virt.c b/hw/arm/virt.c
> index 3b068534a8..dce02136cb 100644
> --- a/hw/arm/virt.c
> +++ b/hw/arm/virt.c
> @@ -81,6 +81,7 @@
> #include "hw/virtio/virtio-iommu.h"
> #include "hw/char/pl011.h"
> #include "qemu/guest-random.h"
> +#include "qapi/qmp/qdict.h"
>
> #define DEFINE_VIRT_MACHINE_LATEST(major, minor, latest) \
> static void virt_##major##_##minor##_class_init(ObjectClass *oc, \
> @@ -2985,12 +2986,23 @@ static void virt_cpu_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
> {
> VirtMachineState *vms = VIRT_MACHINE(hotplug_dev);
> MachineState *ms = MACHINE(hotplug_dev);
> + MachineClass *mc = MACHINE_GET_CLASS(ms);
> ARMCPU *cpu = ARM_CPU(dev);
> CPUState *cs = CPU(dev);
> CPUArchId *cpu_slot;
> int32_t min_cpuid = 0;
> int32_t max_cpuid;
>
> + if (dev->hotplugged && !vms->acpi_dev) {
> + error_setg(errp, "GED acpi device does not exists");
> + return;
> + }
> +
> + if (dev->hotplugged && !mc->has_hotpluggable_cpus) {
> + error_setg(errp, "CPU hotplug not supported on this machine");
> + return;
> + }
> +
I guess these can be combined to:
if (dev->hotplugged && (!mc->has_hotpluggable_cpus || !vms->acpi_dev)) {
error_setg(errp, "CPU hotplug not supported or GED ACPI device not exist");
}
Besides, need we check (vms->gic_version == VIRT_GIC_VERSION_3)?
> /* sanity check the cpu */
> if (!object_dynamic_cast(OBJECT(cpu), ms->cpu_type)) {
> error_setg(errp, "Invalid CPU type, expected cpu type: '%s'",
> @@ -3039,6 +3051,22 @@ static void virt_cpu_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
> }
> virt_cpu_set_properties(OBJECT(cs), cpu_slot, errp);
>
> + /*
> + * Fix the GIC for this new vCPU being plugged. The QOM CPU object for the
> + * new vCPU need to be updated in the corresponding QOM GICv3CPUState object
> + * We also need to re-wire the IRQs for this new CPU object. This update
> + * is limited to the QOM only and does not affects the KVM. Later has
> + * already been pre-sized with possible CPU at VM init time. This is a
> + * workaround to the constraints posed by ARM architecture w.r.t supporting
> + * CPU Hotplug. Specification does not exist for the later.
> + * This patch-up is required both for {cold,hot}-plugged vCPUs. Cold-inited
> + * vCPUs have their GIC state initialized during machvit_init().
> + */
> + if (vms->acpi_dev) {
> + /* TODO: update GIC about this hotplug change here */
> + /* TODO: wire the GIC<->CPU irqs */
> + }
> +
When looking at these 'TODO', it seems you need order the patches to make those
preparatory patches ahead of this one. In this way, the 'TODO' can be avoided.
> /*
> * To give persistent presence view of vCPUs to the guest, ACPI might need
> * to fake the presence of the vCPUs to the guest but keep them disabled.
> @@ -3050,6 +3078,7 @@ static void virt_cpu_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
> static void virt_cpu_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
> Error **errp)
> {
> + VirtMachineState *vms = VIRT_MACHINE(hotplug_dev);
> MachineState *ms = MACHINE(hotplug_dev);
> CPUState *cs = CPU(dev);
> CPUArchId *cpu_slot;
> @@ -3058,10 +3087,81 @@ static void virt_cpu_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
> cpu_slot = virt_find_cpu_slot(ms, cs->cpu_index);
> cpu_slot->cpu = OBJECT(dev);
>
> + /*
> + * Update the ACPI Hotplug state both for vCPUs being {hot,cold}-plugged.
> + * vCPUs can be cold-plugged using '-device' option. For vCPUs being hot
> + * plugged, guest is also notified.
> + */
> + if (vms->acpi_dev) {
> + /* TODO: update acpi hotplug state. Send cpu hotplug event to guest */
> + /* TODO: register cpu for reset & update F/W info for the next boot */
> + }
> +
We needn't validate vms->acpi_dev again since it has been done in pre_plug().
> cs->disabled = false;
> return;
> }
>
> +static void virt_cpu_unplug_request(HotplugHandler *hotplug_dev,
> + DeviceState *dev, Error **errp)
> +{
> + MachineClass *mc = MACHINE_GET_CLASS(qdev_get_machine());
> + VirtMachineState *vms = VIRT_MACHINE(hotplug_dev);
> + ARMCPU *cpu = ARM_CPU(dev);
> + CPUState *cs = CPU(dev);
> +
> + if (!vms->acpi_dev || !dev->realized) {
> + error_setg(errp, "GED does not exists or device is not realized!");
> + return;
> + }
> +
> + if (!mc->has_hotpluggable_cpus) {
> + error_setg(errp, "CPU hot(un)plug not supported on this machine");
> + return;
> + }
> +
> + if (cs->cpu_index == first_cpu->cpu_index) {
> + error_setg(errp, "Boot CPU(id%d=%d:%d:%d:%d) hot-unplug not supported",
> + first_cpu->cpu_index, cpu->socket_id, cpu->cluster_id,
> + cpu->core_id, cpu->thread_id);
> + return;
> + }
> +
> + /* TODO: request cpu hotplug from guest */
> +
> + return;
> +}
> +
> +static void virt_cpu_unplug(HotplugHandler *hotplug_dev, DeviceState *dev,
> + Error **errp)
> +{
> + VirtMachineState *vms = VIRT_MACHINE(hotplug_dev);
> + MachineState *ms = MACHINE(hotplug_dev);
> + CPUState *cs = CPU(dev);
> + CPUArchId *cpu_slot;
> +
> + if (!vms->acpi_dev || !dev->realized) {
> + error_setg(errp, "GED does not exists or device is not realized!");
> + return;
> + }
> +
> + cpu_slot = virt_find_cpu_slot(ms, cs->cpu_index);
> +
> + /* TODO: update the acpi cpu hotplug state for cpu hot-unplug */
> +
> + /* TODO: unwire the gic-cpu irqs here */
> + /* TODO: update the GIC about this hot unplug change */
> +
> + /* TODO: unregister cpu for reset & update F/W info for the next boot */
> +
Same as above.
> + qobject_unref(dev->opts);
> + dev->opts = NULL;
> +
> + cpu_slot->cpu = NULL;
> + cs->disabled = true;
> +
> + return;
> +}
> +
> static void virt_machine_device_pre_plug_cb(HotplugHandler *hotplug_dev,
> DeviceState *dev, Error **errp)
> {
> @@ -3185,6 +3285,8 @@ static void virt_machine_device_unplug_request_cb(HotplugHandler *hotplug_dev,
> } else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_MD_PCI)) {
> virtio_md_pci_unplug_request(VIRTIO_MD_PCI(dev), MACHINE(hotplug_dev),
> errp);
> + } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
> + virt_cpu_unplug_request(hotplug_dev, dev, errp);
> } else {
> error_setg(errp, "device unplug request for unsupported device"
> " type: %s", object_get_typename(OBJECT(dev)));
> @@ -3198,6 +3300,8 @@ static void virt_machine_device_unplug_cb(HotplugHandler *hotplug_dev,
> virt_dimm_unplug(hotplug_dev, dev, errp);
> } else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_MD_PCI)) {
> virtio_md_pci_unplug(VIRTIO_MD_PCI(dev), MACHINE(hotplug_dev), errp);
> + } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
> + virt_cpu_unplug(hotplug_dev, dev, errp);
> } else {
> error_setg(errp, "virt: device unplug for unsupported device"
> " type: %s", object_get_typename(OBJECT(dev)));
Thanks,
Gavin
next prev parent reply other threads:[~2023-09-29 0:21 UTC|newest]
Thread overview: 146+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-26 10:03 [PATCH RFC V2 00/37] Support of Virtual CPU Hotplug for ARMv8 Arch Salil Mehta via
2023-09-26 10:04 ` [PATCH RFC V2 01/37] arm/virt, target/arm: Add new ARMCPU {socket, cluster, core, thread}-id property Salil Mehta via
2023-09-26 23:57 ` [PATCH RFC V2 01/37] arm/virt,target/arm: Add new ARMCPU {socket,cluster,core,thread}-id property Gavin Shan
2023-10-02 9:53 ` Salil Mehta via
2023-10-02 9:53 ` Salil Mehta
2023-10-03 5:05 ` Gavin Shan
2023-09-26 10:04 ` [PATCH RFC V2 02/37] cpus-common: Add common CPU utility for possible vCPUs Salil Mehta via
2023-09-27 3:54 ` Gavin Shan
2023-10-02 10:21 ` Salil Mehta via
2023-10-02 10:21 ` Salil Mehta
2023-10-03 5:34 ` Gavin Shan
2023-09-26 10:04 ` [PATCH RFC V2 03/37] hw/arm/virt: Move setting of common CPU properties in a function Salil Mehta via
2023-09-27 5:16 ` Gavin Shan
2023-10-02 10:24 ` Salil Mehta via
2023-10-02 10:24 ` Salil Mehta
2023-10-10 6:46 ` Shaoqin Huang
2023-10-10 9:47 ` Salil Mehta via
2023-10-10 9:47 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 04/37] arm/virt, target/arm: Machine init time change common to vCPU {cold|hot}-plug Salil Mehta via
2023-09-27 6:28 ` [PATCH RFC V2 04/37] arm/virt,target/arm: " Gavin Shan
2023-10-02 16:12 ` Salil Mehta via
2023-10-02 16:12 ` Salil Mehta
2024-01-16 15:59 ` Jonathan Cameron via
2023-09-27 6:30 ` Gavin Shan
2023-10-02 10:27 ` Salil Mehta via
2023-10-02 10:27 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 05/37] accel/kvm: Extract common KVM vCPU {creation, parking} code Salil Mehta via
2023-09-27 6:51 ` [PATCH RFC V2 05/37] accel/kvm: Extract common KVM vCPU {creation,parking} code Gavin Shan
2023-10-02 16:20 ` Salil Mehta via
2023-10-02 16:20 ` Salil Mehta
2023-10-03 5:39 ` Gavin Shan
2023-09-26 10:04 ` [PATCH RFC V2 06/37] arm/virt, kvm: Pre-create disabled possible vCPUs @machine init Salil Mehta via
2023-09-27 10:04 ` [PATCH RFC V2 06/37] arm/virt,kvm: " Gavin Shan
2023-10-02 16:39 ` Salil Mehta via
2023-10-02 16:39 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 07/37] arm/virt, gicv3: Changes to pre-size GIC with possible vcpus " Salil Mehta via
2023-09-28 0:14 ` Gavin Shan
2023-10-16 16:15 ` Salil Mehta via
2023-10-16 16:15 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 08/37] arm/virt: Init PMU at host for all possible vcpus Salil Mehta via
2023-09-26 10:04 ` [PATCH RFC V2 09/37] hw/acpi: Move CPU ctrl-dev MMIO region len macro to common header file Salil Mehta via
2023-09-28 0:19 ` Gavin Shan
2023-10-16 16:20 ` Salil Mehta via
2023-10-16 16:20 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 10/37] arm/acpi: Enable ACPI support for vcpu hotplug Salil Mehta via
2023-09-28 0:25 ` Gavin Shan
2023-10-16 21:23 ` Salil Mehta via
2023-10-16 21:23 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 11/37] hw/acpi: Add ACPI CPU hotplug init stub Salil Mehta via
2023-09-28 0:28 ` Gavin Shan
2023-10-16 21:27 ` Salil Mehta via
2023-10-16 21:27 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 12/37] hw/acpi: Use qemu_present_cpu() API in ACPI CPU hotplug init Salil Mehta via
2023-09-28 0:40 ` Gavin Shan
2023-10-16 21:41 ` Salil Mehta via
2023-10-16 21:41 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 13/37] hw/acpi: Init GED framework with cpu hotplug events Salil Mehta via
2023-09-28 0:56 ` Gavin Shan
2023-10-16 21:44 ` Salil Mehta via
2023-10-16 21:44 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 14/37] arm/virt: Add cpu hotplug events to GED during creation Salil Mehta via
2023-09-28 1:03 ` Gavin Shan
2023-10-16 21:46 ` Salil Mehta via
2023-10-16 21:46 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 15/37] arm/virt: Create GED dev before *disabled* CPU Objs are destroyed Salil Mehta via
2023-09-28 1:08 ` Gavin Shan
2023-10-16 21:54 ` Salil Mehta via
2023-10-16 21:54 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 16/37] hw/acpi: Update CPUs AML with cpu-(ctrl)dev change Salil Mehta via
2023-09-28 1:26 ` Gavin Shan
2023-10-16 21:57 ` Salil Mehta via
2023-10-16 21:57 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 17/37] arm/virt/acpi: Build CPUs AML with CPU Hotplug support Salil Mehta via
2023-09-28 1:36 ` Gavin Shan
2023-10-16 22:05 ` Salil Mehta via
2023-10-16 22:05 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 18/37] arm/virt: Make ARM vCPU *present* status ACPI *persistent* Salil Mehta via
2023-09-28 23:18 ` Gavin Shan
2023-10-16 22:33 ` Salil Mehta via
2023-10-16 22:33 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 19/37] hw/acpi: ACPI/AML Changes to reflect the correct _STA.{PRES, ENA} Bits to Guest Salil Mehta via
2023-09-28 23:33 ` [PATCH RFC V2 19/37] hw/acpi: ACPI/AML Changes to reflect the correct _STA.{PRES,ENA} " Gavin Shan
2023-10-16 22:59 ` Salil Mehta via
2023-10-16 22:59 ` Salil Mehta
2024-01-17 21:46 ` [PATCH RFC V2 19/37] hw/acpi: ACPI/AML Changes to reflect the correct _STA.{PRES, ENA} " Jonathan Cameron via
2023-09-26 10:04 ` [PATCH RFC V2 20/37] hw/acpi: Update GED _EVT method AML with cpu scan Salil Mehta via
2023-09-28 23:35 ` Gavin Shan
2023-10-16 23:01 ` Salil Mehta via
2023-10-16 23:01 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 21/37] hw/arm: MADT Tbl change to size the guest with possible vCPUs Salil Mehta via
2023-09-28 23:43 ` Gavin Shan
2023-10-16 23:15 ` Salil Mehta via
2023-10-16 23:15 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 22/37] hw/acpi: Make _MAT method optional Salil Mehta via
2023-09-28 23:50 ` Gavin Shan
2023-10-16 23:17 ` Salil Mehta via
2023-10-16 23:17 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 23/37] arm/virt: Release objects for *disabled* possible vCPUs after init Salil Mehta via
2023-09-28 23:57 ` Gavin Shan
2023-10-16 23:28 ` Salil Mehta via
2023-10-16 23:28 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 24/37] hw/acpi: Update ACPI GED framework to support vCPU Hotplug Salil Mehta via
2023-09-26 11:02 ` Michael S. Tsirkin
2023-09-26 11:37 ` Salil Mehta via
2023-09-26 12:00 ` Michael S. Tsirkin
2023-09-26 12:27 ` Salil Mehta via
2023-09-26 13:02 ` lixianglai
2023-09-26 10:04 ` [PATCH RFC V2 25/37] arm/virt: Add/update basic hot-(un)plug framework Salil Mehta via
2023-09-29 0:20 ` Gavin Shan [this message]
2023-10-16 23:40 ` Salil Mehta via
2023-10-16 23:40 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 26/37] arm/virt: Changes to (un)wire GICC<->vCPU IRQs during hot-(un)plug Salil Mehta via
2023-09-26 10:04 ` [PATCH RFC V2 27/37] hw/arm, gicv3: Changes to update GIC with vCPU hot-plug notification Salil Mehta via
2023-09-26 10:04 ` [PATCH RFC V2 28/37] hw/intc/arm-gicv3*: Changes required to (re)init the vCPU register info Salil Mehta via
2023-09-26 10:04 ` [PATCH RFC V2 29/37] arm/virt: Update the guest(via GED) about CPU hot-(un)plug events Salil Mehta via
2023-09-29 0:30 ` Gavin Shan
2023-10-16 23:48 ` Salil Mehta via
2023-10-16 23:48 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 30/37] hw/arm: Changes required for reset and to support next boot Salil Mehta via
2023-09-26 10:04 ` [PATCH RFC V2 31/37] physmem, gdbstub: Common helping funcs/changes to *unrealize* vCPU Salil Mehta via
2023-10-03 6:33 ` [PATCH RFC V2 31/37] physmem,gdbstub: " Philippe Mathieu-Daudé
2023-10-03 10:22 ` Salil Mehta via
2023-10-03 10:22 ` Salil Mehta
2023-10-04 9:17 ` Salil Mehta via
2023-10-04 9:17 ` Salil Mehta
2023-09-26 10:36 ` [PATCH RFC V2 32/37] target/arm: Add support of *unrealize* ARMCPU during vCPU Hot-unplug Salil Mehta via
2023-09-26 10:36 ` [PATCH RFC V2 33/37] target/arm/kvm: Write CPU state back to KVM on reset Salil Mehta via
2023-09-26 10:36 ` [PATCH RFC V2 34/37] target/arm/kvm, tcg: Register/Handle SMCCC hypercall exits to VMM/Qemu Salil Mehta via
2023-09-29 4:15 ` [PATCH RFC V2 34/37] target/arm/kvm,tcg: " Gavin Shan
2023-10-17 0:03 ` Salil Mehta via
2023-10-17 0:03 ` Salil Mehta
2023-09-26 10:36 ` [PATCH RFC V2 35/37] hw/arm: Support hotplug capability check using _OSC method Salil Mehta via
2023-09-29 4:23 ` Gavin Shan
2023-10-17 0:13 ` Salil Mehta via
2023-10-17 0:13 ` Salil Mehta
2023-09-26 10:36 ` [PATCH RFC V2 36/37] tcg/mttcg: enable threads to unregister in tcg_ctxs[] Salil Mehta via
2023-09-26 10:36 ` [PATCH RFC V2 37/37] hw/arm/virt: Expose cold-booted CPUs as MADT GICC Enabled Salil Mehta via
2023-10-11 10:23 ` [PATCH RFC V2 00/37] Support of Virtual CPU Hotplug for ARMv8 Arch Vishnu Pajjuri
2023-10-11 10:32 ` Salil Mehta via
2023-10-11 10:32 ` Salil Mehta
2023-10-11 11:08 ` Vishnu Pajjuri
2023-10-11 20:15 ` Salil Mehta
2023-10-12 17:02 ` Miguel Luis
2023-10-12 17:54 ` Salil Mehta via
2023-10-12 17:54 ` Salil Mehta
2023-10-13 10:43 ` Miguel Luis
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