static void pc_dimm_class_init(ObjectClass *oc, void *data) { DeviceClass *dc = DEVICE_CLASS(oc); PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc);
dc->realize = pc_dimm_realize;
dc->unrealize = pc_dimm_unrealize;
dc->props = pc_dimm_properties;
dc->desc = "DIMM memory module";
ddc->get_memory_region = pc_dimm_get_memory_region;
ddc->get_vmstate_memory_region = pc_dimm_get_vmstate_memory_region;
}
static void piix4_pm_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_CLASS(klass);
k->realize = piix4_pm_realize;
k->config_write = pm_write_config;
k->vendor_id = PCI_VENDOR_ID_INTEL;
k->device_id = PCI_DEVICE_ID_INTEL_82371AB_3;
k->revision = 0x03;
k->class_id = PCI_CLASS_BRIDGE_OTHER;
dc->desc = "PM";
dc->vmsd = &vmstate_acpi;
dc->props = piix4_pm_properties;
/*
* Reason: part of PIIX4 southbridge, needs to be wired up,
* e.g. by mips_malta_init()
*/
dc->user_creatable = false;
dc->hotpluggable = false;
hc->plug = piix4_device_plug_cb;
hc->unplug_request = piix4_device_unplug_request_cb;
hc->unplug = piix4_device_unplug_cb;
adevc->ospm_status = piix4_ospm_status;
adevc->send_event = piix4_send_gpe;
adevc->madt_cpu = pc_madt_cpu_entry;
}
pc_init1 { 设置中断回调函数 if (kvm_ioapic_in_kernel()) { kvm_pc_setup_irq_routing(pcmc->pci_enabled); pcms->gsi = qemu_allocate_irqs(kvm_pc_gsi_handler, gsi_state, GSI_NUM_PINS); } else { pcms->gsi = qemu_allocate_irqs(gsi_handler, gsi_state, GSI_NUM_PINS); }
初始化中断
if (kvm_pic_in_kernel()) {
i8259 = kvm_i8259_init(isa_bus);
} else if (xen_enabled()) {
i8259 = xen_interrupt_controller_init();
} else {
i8259 = i8259_init(isa_bus, pc_allocate_cpu_irq());
}
}
qemu_irq *kvm_i8259_init(ISABus *bus) { i8259_init_chip(TYPE_KVM_I8259, bus, true); 初始化主中断 i8259_init_chip(TYPE_KVM_I8259, bus, false); 初始化从中断
return qemu_allocate_irqs(kvm_pic_set_irq, NULL, ISA_NUM_IRQS);
}
#2 0x00007f117a950f34 in qemuMonitorSend (mon=0x7f1160035880, msg=0x7f117605b6f0) at ../../../src/qemu/qemu_monitor.c:1087 #3 0x00007f117a96749e in qemuMonitorJSONCommandWithFd (mon=0x7f1160035880, cmd=0x7f113c01ac40, scm_fd=-1, reply=0x7f117605b798) at ../../../src/qemu/qemu_monitor_json.c:303 #4 0x00007f117a9675d7 in qemuMonitorJSONCommand (mon=0x7f1160035880, cmd=0x7f113c01ac40, reply=0x7f117605b798) at ../../../src/qemu/qemu_monitor_json.c:333 #5 0x00007f117a9709c5 in qemuMonitorJSONAddDeviceArgs (mon=0x7f1160035880, args=0x0) at ../../../src/qemu/qemu_monitor_json.c:3808 #6 0x00007f117a970a78 in qemuMonitorJSONAddDevice (mon=0x7f1160035880, devicestr=0x7f113c001af0 "pc-dimm,node=0,memdev=ram0,id=dimm0,slot=0") at ../../../src/qemu/qemu_monitor_json.c:3832 #7 0x00007f117a9597cc in qemuMonitorAddDeviceWithFd (mon=0x7f1160035880, devicestr=0x7f113c001af0 "pc-dimm,node=0,memdev=ram0,id=dimm0,slot=0", fd=-1, fdname=0x0) at ../../../src/qemu/qemu_monitor.c:3195 #8 0x00007f117a959877 in qemuMonitorAddDevice (mon=0x7f1160035880, devicestr=0x7f113c001af0 "pc-dimm,node=0,memdev=ram0,id=dimm0,slot=0") at ../../../src/qemu/qemu_monitor.c:3212 #9 0x00007f117a9163b5 in qemuDomainAttachMemory (driver=0x7f1170002b10, vm=0x7f11700dd610, mem=0x7f113c002370) at ../../../src/qemu/qemu_hotplug.c:2210 #10 0x00007f117a98f8a0 in qemuDomainAttachDeviceLive (vm=0x7f11700dd610, dev=0x7f113c000a90, conn=0x7f116c0164d0, driver=0x7f1170002b10) at ../../../src/qemu/qemu_driver.c:7734 #11 0x00007f117a992994 in qemuDomainAttachDeviceLiveAndConfig (conn=0x7f116c0164d0, vm=0x7f11700dd610, driver=0x7f1170002b10, xml=0x7f113c001590 "<?xml version="1.0" encoding="UTF-8" standalone="yes"?><memory model="dimm"><target><size unit="KiB">2097152</size><node>0</node></target></memory>", flags=3) at ../../../src/qemu/qemu_driver.c:8796 #12 0x00007f117a992cc1 in qemuDomainAttachDeviceFlags (dom=0x7f113c001360, xml=0x7f113c001590 "<?xml version="1.0" encoding="UTF-8" standalone="yes"?><memory model="dimm"><target><size unit="KiB">2097152</size><node>0</node></target></memory>", flags=3) at ../../../src/qemu/qemu_driver.c:8880 #13 0x00007f118a0cdd80 in virDomainAttachDeviceFlags (domain=0x7f113c001360, xml=0x7f113c001590 "<?xml version="1.0" encoding="UTF-8" standalone="yes"?><memory model="dimm"><target><size unit="KiB">2097152</size><node>0</node></target></memory>", flags=3) at ../../../src/libvirt-domain.c:8156
pc_dimm_plug--> piix4_device_plug_cb -->acpi_memory_plug_cb -->acpi_send_event-->piix4_send_gpe -->acpi_send_gpe_event -->acpi_update_sci -->qemu_set_irq -->kvm_pc_gsi_handler -->qemu_set_irq -->kvm_pic_set_irq -->kvm_set_irq
#0 pc_dimm_memory_plug (dev=dev@entry=0x5564b9dcaf60, hpms=hpms@entry=0x5564b8f03af0, mr=0x5564b9d57ce0, align=2097152, errp=errp@entry=0x7ffcd7286750) at /vms/disk2/v-e0522/v-e0522/daemon/qemu/qemu-2.12/hw/mem/pc-dimm.c:40 #1 0x00005564b75a17db in pc_dimm_plug (errp=0x7ffcd72867b0, dev=0x5564b9dcaf60, hotplug_dev=<optimized out>) qemu-2.12/hw/i386/pc.c:1714 #2 pc_machine_device_plug_cb (hotplug_dev=<optimized out>, dev=0x5564b9dcaf60, errp=0x7ffcd72867b0) qemu-2.12/hw/i386/pc.c:2024 #3 0x00005564b76a5f6e in device_set_realized (obj=<optimized out>, value=<optimized out>, errp=0x7ffcd72868d8) qemu-2.12/hw/core/qdev.c:862 #4 0x00005564b7809227 in property_set_bool (obj=0x5564b9dcaf60, v=<optimized out>, name=<optimized out>, opaque=0x5564ba43ee50, errp=0x7ffcd72868d8) v-e0522/daemon/qemu/qemu-2.12/qom/object.c:1923 #5 0x00005564b780d46f in object_property_set_qobject (obj=obj@entry=0x5564b9dcaf60, value=value@entry=0x5564b9ab1570, name=name@entry=0x5564b79ca95f "realized", errp=errp@entry=0x7ffcd72868d8) at /vms/disk2/v-e0522/v-e0522/daemon/qemu/qemu-2.12/qom/qom-qobject.c:27 #6 0x00005564b780b090 in object_property_set_bool (obj=0x5564b9dcaf60, value=<optimized out>, name=0x5564b79ca95f "realized", errp=0x7ffcd72868d8) at /vms/disk2/v-e0522/v-e0522/daemon/qemu/qemu-2.12/qom/object.c:1188 #7 0x00005564b762b68a in qdev_device_add (opts=opts@entry=0x5564b9dcbc80, errp=errp@entry=0x7ffcd72869b0) qemu-2.12/qdev-monitor.c:627 #8 0x00005564b762bcb3 in qmp_device_add (qdict=<optimized out>, ret_data=<optimized out>, errp=0x7ffcd72869e8) qemu-2.12/qdev-monitor.c:807
pc_dimm_plug-->pc_dimm_memory_plug -->memory_region_add_subregion -->memory_region_add_subregion_common -->memory_region_update_container_subregions --> memory_region_transaction_commit | -->flatviews_reset -->generate_memory_topology -->render_memory_region | -->address_space_set_flatview -->address_space_update_topology_pass -->kvm_region_add -->kvm_set_phys_mem 将MemoryRegion映射到线性地址空间FlatView，得到若干个 MemoryRegionSection ，调用 kvm_region_add ，将 MemoryRegionSection 注册到 KVM 中
memory_region_add_subregion_common 加入subregions链表
memory_region_transaction_begin --> qemu_flush_coalesced_mmio_buffer | --> kvm_flush_coalesced_mmio_buffer | --> ++memory_region_transaction_depth KVM 中对某些 MMIO 做了 batch 优化：KVM 遇到 MMIO 而 VMEXIT 时，将 MMIO 操作记录到 kvm_coalesced_mmio 结构中，然后塞到 kvm_coalesced_mmio_ring 中，不退出到 QEMU 。直到某一次退回到 QEMU ，要更新内存空间之前的那一刻，把 kvm_coalesced_mmio_ring 中的 kvm_coalesced_mmio 取出来做一遍，保证内存的一致性。这事就是 kvm_flush_coalesced_mmio_buffer 干的。
qemu_allocate_irq 分配中断号 pic_stat_update_irq 统计中断号的次数
mr = ddc->get_memory_region = pc_dimm_get_memory_region hhc->plug = piix4_device_plug_cb adevc->send_event = piix4_send_gpe
