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qemu动态设备管理(hotplug)
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Virtual CPU hotplug . A complete example of vCPU hotplug (and hot-unplug) using QMP device_add and device_del. vCPU hotplug . Launch QEMU as follows (note that the "maxcpus" is mandatory to allow vCPU hotplug):
Disk and NIC hotplug work out of the box for all Windows versions >2003 CPU and memory hotplug work on > 2008 enterprise/datacenter, 2012 > standard Disk and NIC Hotplug/unplug. By default, hot-plug is already enabled for virtual network devices, virtual disks and virtual USB devices. Just add/remove your disks, USB devices or NICs as usual.
This event source is advertised to the guest by the addition of a hot-plug-events node under /event-sources node of the guest's device tree using the standard format described in [LoPAR], section B.5.12.2. Hot plug/unplug event structure The hot plug specific payload in QEMU is implemented as follows (with all values encoded in big-endian ...
Virtual CPU hotplug . A complete example of vCPU hotplug (and hot-unplug) using QMP device_add and device_del. vCPU hotplug . Launch QEMU as follows (note that the "maxcpus" is mandatory to allow vCPU hotplug):
(qemu) device_add usb-host,vendorid=0x03f0,productid=0x134a,id=usb0 #增加usb设备 (qemu) device_del usb0 #删除对应id的usb设备
For guests that support PCI hotplug (usually enabled via modules: acpiphp pci_hotplug) disks can be hotplugged at run time through the monitor (Human Monitor Protocol, HMP, aka -monitor). This page documents HMP commands used to hotplug virtio-blk and scsi disks into a Linux guest with PCI hotplug support enabled.
(x86) Detecting and enabling modern CPU hotplug interface QEMU starts with legacy CPU hotplug interface enabled. Detecting and switching to modern interface is based on the 2 legacy CPU hotplug features: Writes into CPU bitmap are ignored. CPU bitmap always has bit #0 set, corresponding to boot CPU.
There are 2 ways to hotplug CPU in QEMU: dedicated legacy interface: cpu-add QMP command (removed in QEMU v5.2) generic device-add/device-del interface for hot-(un)plugging CPUs; Owner. Name: Igor Mammedov; Email: imammedo@redhat.com; cpu-add interface. Note: The cpu-add interface has been removed starting with QEMU v5.2.
文章浏览阅读828次。本文深入剖析QEMU-KVM的设备热插拔机制，从HMP和QMP协议交互开始，详细解释了设备添加的代码流程，涉及QDict、QemuOpts、QOM模型和ACPI hotplug机制。通过分析KVM内核代码，展示了设备中断事件如何从主机到客户机的传递，最后介绍了设备中断的注入过程。
2. CPU Hotplug 特性. QEMU在x86上很早就支持了CPU hotplug，但在aarch64上目前upstream还没有支持。 值得高兴地是，在openEuler上提前为我们带来了这个特性， 感谢HUAWEI Hisilicon和openEuler virtualization team的努力! CPU Hotplug主要涉及的点有： MADT(Multiple APIC Description Table)表构构建