- KVM源码目录树分析
- KVM相关文件目录
- KVM模块入口点搜索
- KVM模块Kconfig
- KVM模块Makefile文件
- kvm模块入口文件vmx.c
- 使用SourceInsght4阅读源码
- END
KVM源码目录树分析
- linux 4.* 内核源码囊括KVM模块源码，拆分一下看看
KVM相关文件目录
首先在顶层目录搜索一下
root@ubuntu16x64:~/kernel/linux-4.4.124# find ./ -name "*kvm*"
./arch/s390/include/uapi/asm/kvm_perf.h
./arch/s390/include/uapi/asm/kvm_virtio.h
./arch/s390/include/uapi/asm/kvm.h
./arch/s390/include/uapi/asm/kvm_para.h
./arch/s390/include/asm/kvm_host.h
./arch/s390/include/asm/kvm_para.h
./arch/s390/kvm
./arch/s390/kvm/kvm-s390.c
./arch/s390/kvm/kvm-s390.h
./arch/arm64/include/uapi/asm/kvm.h
./arch/arm64/include/asm/kvm_coproc.h
./arch/arm64/include/asm/kvm_emulate.h
./arch/arm64/include/asm/kvm_mmio.h
./arch/arm64/include/asm/kvm_psci.h
./arch/arm64/include/asm/kvm_arm.h
./arch/arm64/include/asm/kvm_mmu.h
./arch/arm64/include/asm/kvm_asm.h
./arch/arm64/include/asm/kvm_host.h
./arch/arm64/kvm
./arch/powerpc/include/uapi/asm/kvm.h
./arch/powerpc/include/uapi/asm/kvm_para.h
./arch/powerpc/include/asm/kvm_booke_hv_asm.h
./arch/powerpc/include/asm/kvm_fpu.h
./arch/powerpc/include/asm/kvm_book3s_asm.h
./arch/powerpc/include/asm/kvm_book3s_32.h
./arch/powerpc/include/asm/kvm_asm.h
./arch/powerpc/include/asm/kvm_book3s.h
./arch/powerpc/include/asm/kvm_book3s_64.h
./arch/powerpc/include/asm/kvm_host.h
./arch/powerpc/include/asm/kvm_booke.h
./arch/powerpc/include/asm/kvm_ppc.h
./arch/powerpc/include/asm/kvm_para.h
./arch/powerpc/kvm
./arch/powerpc/kernel/kvm.c
./arch/powerpc/kernel/kvm_emul.S
./arch/arm/include/uapi/asm/kvm.h
./arch/arm/include/uapi/asm/kvm_para.h
./arch/arm/include/asm/kvm_coproc.h
./arch/arm/include/asm/kvm_emulate.h
./arch/arm/include/asm/kvm_mmio.h
./arch/arm/include/asm/kvm_psci.h
./arch/arm/include/asm/kvm_arm.h
./arch/arm/include/asm/kvm_mmu.h
./arch/arm/include/asm/kvm_asm.h
./arch/arm/include/asm/kvm_host.h
./arch/arm/kvm
./arch/frv/include/uapi/asm/kvm_para.h
./arch/sparc/include/uapi/asm/kvm_para.h
./arch/x86/configs/kvm_guest.config
./arch/x86/include/uapi/asm/kvm_perf.h
./arch/x86/include/uapi/asm/kvm.h
./arch/x86/include/uapi/asm/kvm_para.h
./arch/x86/include/asm/kvm_emulate.h
./arch/x86/include/asm/kvm_guest.h
./arch/x86/include/asm/kvm_host.h
./arch/x86/include/asm/kvm_para.h
./arch/x86/kvm
./arch/x86/kvm/kvm_cache_regs.h
./arch/x86/kernel/kvmclock.o
./arch/x86/kernel/kvm.o
./arch/x86/kernel/kvm.c
./arch/x86/kernel/.kvmclock.o.cmd
./arch/x86/kernel/kvmclock.c
./arch/x86/kernel/.kvm.o.cmd
./arch/tile/include/uapi/asm/kvm_para.h
./arch/tile/kvm
./arch/mn10300/include/uapi/asm/kvm_para.h
./arch/mips/configs/malta_kvm_guest_defconfig
./arch/mips/configs/malta_kvm_defconfig
./arch/mips/include/uapi/asm/kvm.h
./arch/mips/include/uapi/asm/kvm_para.h
./arch/mips/include/asm/kvm_host.h
./arch/mips/include/asm/kvm_para.h
./arch/mips/kvm
./arch/um/include/asm/kvm_para.h
./arch/microblaze/include/uapi/asm/kvm_para.h
./arch/hexagon/include/uapi/asm/kvm_para.h
./arch/alpha/include/uapi/asm/kvm_para.h
./arch/score/include/uapi/asm/kvm_para.h
./virt/kvm
./virt/kvm/kvm_main.c
./drivers/s390/virtio/kvm_virtio.c
./include/linux/kvm_irqfd.h
./include/linux/kvm_types.h
./include/linux/kvm_host.h
./include/linux/kvm_para.h
./include/kvm
./include/asm-generic/kvm_para.h
./include/uapi/linux/kvm.h
./include/uapi/linux/kvm_para.h
./include/uapi/asm-generic/kvm_para.h
./include/config/kvm
./include/config/have/kvm
./include/config/have/kvm.h
./include/config/kvm.h
./include/trace/events/kvm.h
./tools/testing/selftests/rcutorture/bin/kvm-recheck-lock.sh
./tools/testing/selftests/rcutorture/bin/kvm-recheck-rcu.sh
./tools/testing/selftests/rcutorture/bin/kvm-build.sh
./tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
./tools/testing/selftests/rcutorture/bin/kvm.sh
./tools/testing/selftests/rcutorture/bin/kvm-recheck.sh
./tools/testing/ktest/examples/kvm.conf
./tools/perf/arch/s390/util/kvm-stat.c
./tools/perf/arch/x86/util/kvm-stat.c
./tools/perf/util/kvm-stat.h
./tools/perf/builtin-kvm.c
./tools/perf/Documentation/perf-kvm.txt
./tools/lib/traceevent/plugin_kvm.c
./Documentation/virtual/kvm
移去非x86架构的相关文件
# x86体系结构相关
./arch/x86/configs/kvm_guest.config
./arch/x86/include/uapi/asm/kvm_perf.h
./arch/x86/include/uapi/asm/kvm.h
./arch/x86/include/uapi/asm/kvm_para.h
./arch/x86/include/asm/kvm_emulate.h
./arch/x86/include/asm/kvm_guest.h
./arch/x86/include/asm/kvm_host.h
./arch/x86/include/asm/kvm_para.h
./arch/x86/kvm
./arch/x86/kvm/kvm_cache_regs.h
./arch/x86/kernel/kvmclock.o
./arch/x86/kernel/kvm.o
./arch/x86/kernel/kvm.c
./arch/x86/kernel/.kvmclock.o.cmd
./arch/x86/kernel/kvmclock.c
./arch/x86/kernel/.kvm.o.cmd
./virt/kvm
./virt/kvm/kvm_main.c
./drivers/s390/virtio/kvm_virtio.c
# 头文件依赖
./include/linux/kvm_irqfd.h
./include/linux/kvm_types.h
./include/linux/kvm_host.h
./include/linux/kvm_para.h
./include/kvm
./include/asm-generic/kvm_para.h
./include/uapi/linux/kvm.h
./include/uapi/linux/kvm_para.h
./include/uapi/asm-generic/kvm_para.h
./include/config/kvm
./include/config/have/kvm
./include/config/have/kvm.h
./include/config/kvm.h
./include/trace/events/kvm.h
# 测试工具
./tools/testing/selftests/rcutorture/bin/kvm-recheck-lock.sh
./tools/testing/selftests/rcutorture/bin/kvm-recheck-rcu.sh
./tools/testing/selftests/rcutorture/bin/kvm-build.sh
./tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
./tools/testing/selftests/rcutorture/bin/kvm.sh
./tools/testing/selftests/rcutorture/bin/kvm-recheck.sh
./tools/testing/ktest/examples/kvm.conf
./tools/perf/arch/x86/util/kvm-stat.c
./tools/perf/util/kvm-stat.h
./tools/perf/builtin-kvm.c
./tools/perf/Documentation/perf-kvm.txt
./tools/lib/traceevent/plugin_kvm.c
# 说明文档
./Documentation/virtual/kvm
当然不可能只有这些，毕竟有些文件名字不含kvm字样，但是可以推断出目录包括哪些
./include/kvm
./arch/x86/include/asm/
./arch/x86/include/uapi/asm/
./arch/x86/configs/
./arch/x86/kvms
./virt/kvm
KVM模块入口点搜索
每个内核模块都有入口。那么kvm如果是个单独内核模块，它的入口在哪里？
root@ubuntu16x64:~/kernel/linux-4.4.124# find ./ -type f -name "*.c"|xargs grep "module_init" |grep kvm
./arch/s390/kvm/kvm-s390.c:module_init(kvm_s390_init);
./arch/powerpc/kvm/book3s.c:module_init(kvmppc_book3s_init);
./arch/powerpc/kvm/e500.c:module_init(kvmppc_e500_init);
./arch/powerpc/kvm/book3s_pr.c:module_init(kvmppc_book3s_init_pr);
./arch/powerpc/kvm/book3s_hv.c:module_init(kvmppc_book3s_init_hv);
./arch/powerpc/kvm/e500mc.c:module_init(kvmppc_e500mc_init);
./arch/arm/kvm/arm.c:module_init(arm_init);
./arch/x86/kvm/svm.c:module_init(svm_init)
./arch/x86/kvm/x86.c: r = kvm_mmu_module_init();
./arch/x86/kvm/mmu.c:int kvm_mmu_module_init(void)
./arch/x86/kvm/vmx.c:module_init(vmx_init)
./arch/mips/kvm/mips.c:module_init(kvm_mips_init);
删去平台无关
./arch/x86/kvm/svm.c:module_init(svm_init)
./arch/x86/kvm/x86.c: r = kvm_mmu_module_init();
./arch/x86/kvm/mmu.c:int kvm_mmu_module_init(void)
./arch/x86/kvm/vmx.c:module_init(vmx_init)
正常模块入口应该是module_init()，那就剩它两个了，如果有点虚拟化概念的都知道。SVM是AMD家的，VMX是intel家的。没毛病。这里肯定是个条件编译区分开来。
./arch/x86/kvm/svm.c:module_init(svm_init)
./arch/x86/kvm/vmx.c:module_init(vmx_init)
找到入口就好分析了，来看看vmx.c，毕竟我用的是intel的，只分析vmx
KVM模块Kconfig
切换到kvm架构平台目录下
root@ubuntu16x64:~/kernel/linux-4.4.124/arch/x86/kvm# cat Kconfig
#
# KVM configuration
#
source "virt/kvm/Kconfig"
menuconfig VIRTUALIZATION
bool "Virtualization"
depends on HAVE_KVM || X86
default y
---help---
Say Y here to get to see options for using your Linux host to run other
operating systems inside virtual machines (guests).
This option alone does not add any kernel code.
If you say N, all options in this submenu will be skipped and disabled.
if VIRTUALIZATION
config KVM
tristate "Kernel-based Virtual Machine (KVM) support"
depends on HAVE_KVM
depends on HIGH_RES_TIMERS
# for TASKSTATS/TASK_DELAY_ACCT:
depends on NET && MULTIUSER
depends on X86_LOCAL_APIC
select PREEMPT_NOTIFIERS
select MMU_NOTIFIER
select ANON_INODES
select HAVE_KVM_IRQCHIP
select HAVE_KVM_IRQFD
select IRQ_BYPASS_MANAGER
select HAVE_KVM_IRQ_BYPASS
select HAVE_KVM_IRQ_ROUTING
select HAVE_KVM_EVENTFD
select KVM_APIC_ARCHITECTURE
select KVM_ASYNC_PF
select USER_RETURN_NOTIFIER
select KVM_MMIO
select TASKSTATS
select TASK_DELAY_ACCT
select PERF_EVENTS
select HAVE_KVM_MSI
select HAVE_KVM_CPU_RELAX_INTERCEPT
select KVM_GENERIC_DIRTYLOG_READ_PROTECT
select KVM_VFIO
select SRCU
---help---
Support hosting fully virtualized guest machines using hardware
virtualization extensions. You will need a fairly recent
processor equipped with virtualization extensions. You will also
need to select one or more of the processor modules below.
This module provides access to the hardware capabilities through
a character device node named /dev/kvm.
To compile this as a module, choose M here: the module
will be called kvm.
If unsure, say N.
config KVM_INTEL
tristate "KVM for Intel processors support"
depends on KVM
# for perf_guest_get_msrs():
depends on CPU_SUP_INTEL
---help---
Provides support for KVM on Intel processors equipped with the VT
extensions.
To compile this as a module, choose M here: the module
will be called kvm-intel.
config KVM_AMD
tristate "KVM for AMD processors support"
depends on KVM
---help---
Provides support for KVM on AMD processors equipped with the AMD-V
(SVM) extensions.
To compile this as a module, choose M here: the module
will be called kvm-amd.
config KVM_MMU_AUDIT
bool "Audit KVM MMU"
depends on KVM && TRACEPOINTS
---help---
This option adds a R/W kVM module parameter 'mmu_audit', which allows
auditing of KVM MMU events at runtime.
config KVM_DEVICE_ASSIGNMENT
bool "KVM legacy PCI device assignment support (DEPRECATED)"
depends on KVM && PCI && IOMMU_API
default n
---help---
Provide support for legacy PCI device assignment through KVM. The
kernel now also supports a full featured userspace device driver
framework through VFIO, which supersedes this support and provides
better security.
If unsure, say N.
# OK, it's a little counter-intuitive to do this, but it puts it neatly under
# the virtualization menu.
source drivers/vhost/Kconfig
source drivers/lguest/Kconfig
endif # VIRTUALIZATION
root@ubuntu16x64:~/kernel/linux-4.4.124/arch/x86/kvm#
KVM模块Makefile文件
root@ubuntu16x64:~/kernel/linux-4.4.124/arch/x86/kvm# cat Makefile
ccflags-y += -Iarch/x86/kvm
CFLAGS_x86.o := -I.
CFLAGS_svm.o := -I.
CFLAGS_vmx.o := -I.
KVM := ../../../virt/kvm
kvm-y += $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o \
$(KVM)/eventfd.o $(KVM)/irqchip.o $(KVM)/vfio.o
kvm-$(CONFIG_KVM_ASYNC_PF) += $(KVM)/async_pf.o
kvm-y += x86.o mmu.o emulate.o i8259.o irq.o lapic.o \
i8254.o ioapic.o irq_comm.o cpuid.o pmu.o mtrr.o \
hyperv.o
kvm-$(CONFIG_KVM_DEVICE_ASSIGNMENT) += assigned-dev.o iommu.o
kvm-intel-y += vmx.o pmu_intel.o
kvm-amd-y += svm.o pmu_amd.o
obj-$(CONFIG_KVM) += kvm.o
obj-$(CONFIG_KVM_INTEL) += kvm-intel.o
obj-$(CONFIG_KVM_AMD) += kvm-amd.o
root@ubuntu16x64:~/kernel/linux-4.4.124/arch/x86/kvm#
kvm模块入口文件vmx.c
一万多行，没毛病~果断用SourceInsight阅读源码
使用SourceInsght4阅读源码
