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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-3.17.4\Documentation\virtual\kvm\
(2)Linux-3.17.4\include\
(3)Linux-3.17.4\drivers\s390\kvm\
(4)Linux-3.17.4\virt\kvm\
(5)Linux-3.17.4\arch\*\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-3.17.4\arch\x86\include\asm
注:因为每个文件都含有makefile,所以就不列举makefile文件了。
(1) Linux-3.17.4\Documentation\virtual\kvm\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-3.17.4\include\kvm\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-3.17.4\include\trace\events\kvm.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-3.17.4\include\linux\kvm_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-3.17.4\include\linux\kvm_para.h: 代码行数:27
一个函数:static inline int kvm_para_has_feature(unsigned int feature)
4)linux-3.17.4\include\linux\kvm_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-3.17.4\include\uapi\linux\kvm.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-3.17.4\include\uapi\linux\kvm_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-3.17.4\include\uapi\asm-generic\kvm_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-3.17.4\include\asm-generic\kvm_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-3.17.4\drivers\s390\kvm\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-3.17.4\virt\kvm\ 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-3.17.4\arch\x86\kvm\ 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-3.17.4\arch\x86\include\asm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)。
KVM源代码框架