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  • KVM源代码框架

    自己通过看代码总结的内核中包含kvm的文件夹:

    (1)Linux-3.17.4Documentationvirtualkvm

    (2)Linux-3.17.4include

    (3)Linux-3.17.4driverss390kvm

    (4)Linux-3.17.4virtkvm

    (5)Linux-3.17.4arch*kvm   (*号代表以下处理器体系架构:x86、tile、s390、powerpc、mips、ia64、arm64、arm)  先研究x86体系架构。

    (6)linux-3.17.4archx86includeasm

    注:因为每个文件都含有makefile,所以就不列举makefile文件了。

    (1)  Linux-3.17.4Documentationvirtualkvm下面为文档介绍,主要介绍了KVM中的使用的一些技术,对其中一部分数据结构和方法进行说明。

    (2)  Linux-3.17.4includekvm中有2个文件:代码总共行数:4957

    Arm_arch_timer.h:KVM定时器相关的函数      代码行数:103

    Arm_vgic.h:虚拟通用中断控制器相关的数据结构和函数     代码行数:314

    1)linux-3.17.4include raceeventskvm.h: 代码行数:322

    一些跟踪事件函数的声明

    其中一段代码:

    #define kvm_trace_exit_reason                                       

           ERSN(UNKNOWN), ERSN(EXCEPTION), ERSN(IO), ERSN(HYPERCALL), 

           ERSN(DEBUG), ERSN(HLT), ERSN(MMIO), ERSN(IRQ_WINDOW_OPEN),      

           ERSN(SHUTDOWN), ERSN(FAIL_ENTRY), ERSN(INTR), ERSN(SET_TPR),      

           ERSN(TPR_ACCESS), ERSN(S390_SIEIC), ERSN(S390_RESET), ERSN(DCR),

           ERSN(NMI), ERSN(INTERNAL_ERROR), ERSN(OSI), ERSN(PAPR_HCALL),     

          ERSN(S390_UCONTROL), ERSN(WATCHDOG), ERSN(S390_TSCH)

    2)linux-3.17.4includelinuxkvm_host.h:      代码行数:1101

    非常重要的头文件

    /*

     * The bit 16 ~ bit 31 of kvm_memory_region::flags are internally used

     * in kvm, other bits are visible for userspace which are defined in

     * include/linux/kvm_h.

     */

    3)linux-3.17.4includelinuxkvm_para.h:      代码行数:27

    一个函数:static inline int kvm_para_has_feature(unsigned int feature)

    4)linux-3.17.4includelinuxkvm_types.h:    代码行数:79

    /*

     * Address types:

    *  gva - guest virtual address

     *  gpa - guest physical address

     *  gfn - guest frame number

     *  hva - host virtual address

     *  hpa - host physical address

     *  hfn - host frame number

     */

    5)linux-3.17.4includeuapilinuxkvm.h: 代码行数:1186

     Userspace interface for /dev/kvm - kernel based virtual machine

    /*The bit 0 ~ bit 15 of kvm_memory_region::flags are visible for userspace,

     * other bits are reserved for kvm internal use which are defined in

     * include/linux/kvm_host.h.*/

    6)linux-3.17.4includeuapilinuxkvm_para.h:      代码行数:33

    /*

     * This header file provides a method for making a hypercall to the host

     * Architectures should define:

     * - kvm_hypercall0, kvm_hypercall1...

     * - kvm_arch_para_features

     * - kvm_para_available

     */

    /* Return values for hypercalls */

    /*

     * hypercalls use architecture specific

     */

    7)linux-3.17.4includeuapiasm-generickvm_para.h: 代码行数:0

    /*

     * There isn't anything here, but the file must not be empty or(否则) patch

     * will delete it.

     */

    8)linux-3.17.4includeasm-generickvm_para.h: 代码行数:27

    This function is used by architectures that support kvm to avoid issuing false soft lockup messages.

    Uapi可能是user api的意思

     (3)Linux-3.17.4driverss390kvm文件夹下有2个文件:代码总共行数:1765

    Kvm_virtio.c: 功能是 virtio for kvm on s390    代码行数:513

    Virtio_ccw.c:  功能是ccw based virtio transport      代码行数:1252

    virtio 是对半虚拟化 hypervisor 中的一组通用模拟设备的抽象。

    重点看第(4)和(5)部分

    (4)Linux-3.17.4virtkvm  与体系结构无关的代码   代码总共行数:10629

    包含一个名为arm的文件夹和15个文件。

    assigned-dev.c 代码行数:1027

    功能:Kernel-based Virtual Machine - device assignment support

    async_pf.c和async_pf.h:   代码行数:228

    kvm asynchronous fault support  KVM支持异步故障

    coalesced_mmio.c和coalesced_mmio.h:     代码行数:183+39

    KVM  coalesced(合并) MMIO

    MMIO(Memory mapping I/O)即内存映射I/O,它是PCI规范的一部分,I/O设备被放置在内存空间而不是I/O空间。

    eventfd.c: 代码行数:931

    kvm eventfd support - use eventfd objects to signal various KVM events

    ioapic.c和ioapic.h:       代码行数:646+103

    apic: Advanced Programmable Interrupt Controller高级可编程中断控制器.

    Iodev.h: 对io设备的操作头文件 代码行数:71

    Iommu.c : 代码行数:361

     input/output memory management unit。Device的IOMMU类似于CPU的MMU。

    MMU是Memory Management Unit的缩写,中文名是内存管理单元,它是中央处理器(CPU)中用来管理虚拟存储器、物理存储器的控制线路,同时也负责虚拟地址映射为物理地址,以及提供硬件机制的内存访问授权,多用户多进程操作系统。

    Irq_comm.c:   代码行数:370

    Common API for in kernel interrupt controllers .

    irqchip.c:   代码行数:215

    Common API for in kernel interrupt controllers

    This file is derived from virt/kvm/irq_comm.c.

          IRQ全称为Interrupt Request,即是“中断请求”的意思,IRQ的作用就是在我们所用的电脑中,执行硬件中断请求的动作。

    Kconfig: KVM common configuration items and defaults

    Kvm_main.c:     代码行数:3279

    Kernel-based Virtual Machine driver for Linux.This module enables machines with Intel VT-x extensions to run virtual machines without emulation or binary translation.

    Vfio.c: 代码行数:278

     VFIO-KVM bridge pseudo device

    VFIO是一套用户态驱动框架,它提供两种基本服务:(1)向用户态提供访问硬件设备的接口(2) 向用户态提供配置IOMMU的接口

    arm文件夹中包含4个文件。

     arch_timer.c:KVM定时器  代码行数:318

    Vgic:virtual generic interrupt controller,其它3个文件功能就是主要描述它的。V2和v3是第二第三个版本。 代码行数:2070+264+246

    (5) Linux-3.17.4archx86kvm   与体系结构相关的代码 代码总共行数:39246

    包含25个文件

    Cupid.c和cpuid.h: 代码行数:795+107

     CPU ID 指用户计算机当今的信息处理器的信息。

     Kernel-based Virtual Machine driver for Linux

        cpuid support routines

    derived from arch/x86/kvm/x86.c

    emulate.c: 代码行数:5068

    Generic x86 (32-bit and 64-bit) instruction decoder and emulator.

          Linux coding style, mod r/m decoder, segment base fixes, real-mode privileged instructions

    I8254.c和i8254.h: 代码行数:778+66

    8253/8254 interval timer emulation,就是定时器仿真。Based on QEMU and Xen.

    I8259.c:     代码行数:665

    8259 interrupt controller emulation,中断控制器仿真。Port from Qemu.

    irq.c:    代码行数:130

    API for in kernel interrupt controller

    irq.h:    代码行数:107

     in kernel interrupt controller related definitions

    Kconfig: KVM configuration;  source "virt/kvm/Kconfig"

    Kvm_cache_regs.h: 代码行数:103

    Lapic.c和Lapic.h:   代码行数:1937+174

    Local APIC virtualization。apic: Advanced Programmable Interrupt Controller高级可编程中断控制器

    Mmu.c和mmu.h: 代码行数:4608 + 182

    Kernel-based Virtual Machine driver for Linux

    * This module enables machines with Intel VT-x extensions to run virtual machines without emulation or binary translation.

    * MMU support

    Mmu_audit.c: Audit code for KVM MMU   代码行数:300

    Mmutrace.h:     代码行数:334

    paging_tmpl.h: 代码行数:993

    Kernel-based Virtual Machine driver for Linux;MMU support;

    pmu.c: 代码行数:573

    Kernel-based Virtual Machine -- Performance Monitoring Unit support, 性能监视单元支持

    svm.c:       代码行数:4424

    Kernel-based Virtual Machine driver for Linux; AMD SVM support;svm:安全虚拟机

    Trace.h:     代码行数:862

    Tss.h:        代码行数:60

    Vmx.c: 代码行数:9132

    Kernel-based Virtual Machine driver for Linux;

    X86.c和x86.h: 代码行数:7676 + 172

     * Kernel-based Virtual Machine driver for Linux

     * derived from drivers/kvm/kvm_main.c

    (6)linux-3.17.4archx86includeasm下面有4个头文件代码总共行数:1663

    kvm_emulate.h:      代码行数:428

    Generic x86 (32-bit and 64-bit) instruction decoder and emulator. Copyright (c) 2005 Keir Fraser. From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4

    kvm_guest.h:          代码行数:7

    #ifndef _ASM_X86_KVM_GUEST_H//如果没有定义~

    #define _ASM_X86_KVM_GUEST_H//则定义~,且编译以下代码

    int kvm_setup_vsyscall_timeinfo(void);

    #endif /* _ASM_X86_KVM_GUEST_H */

    kvm_host.h:           代码行数:1096

    This header defines architecture specific interfaces, x86 version

    kvm_para.h:           代码行数:132

    共有代码:58260行(只包含x86架构)。

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  • 原文地址:https://www.cnblogs.com/hsqdboke/p/4166779.html
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