第二回KVM読書会のスライドです.　Intel-VT と Linux KVM の概要についてまとめました.

1. KVM
Tsuyoshi Ozawa @ Univ. of Tsukuba
Twitter oza_x86
2009 8 30

2. 1. Intel-VT
2. KVM ( 2)
2009 8 30

3. Intel-VT
2009 8 30

4. 2009 8 30

5. Intel-VT
1.
2.VM
CPU
x86
2009 8 30

6. x86
( )
Ring3 = User Mode
Ring2
Ring1 (0 )
Ring0 OS Ring 0
Kernel Mode
Ring3
OS
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7. 1.
2.
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8. Ring3 Ring0
Ring3
Ring2
Ring1
Ring0
Kernel Mode
User Mode
2009 8 30

9. Ring3 Ring0
Ring3
Ring2
out
Ring1
Ring0
Kernel Mode
User Mode
2009 8 30

10. Ring3 Ring0
Ring3
Ring2
out
Ring1
Ring0
Kernel Mode
( )
User Mode
2009 8 30

11. Ring3 Ring0
Ring3 = User Mode
Ring2
out
Ring1
Ring0
Kernel Mode
2009 8 30

12. VM
CPU
etc...
2009 8 30

13. VM
Kernel Kernel
Mode Mode
CPU
2009 8 30

14. ?
2009 8 30

15. Xen VMWare
Ring3
Ring2
Ring1 = Guest Kerel
Ring0
HyperVisor
OS
2009 8 30

16. Xen VMWare
Ring 1 Ring 2 Ring 1
Kernel Kernel
Mode Mode
Hypervirsor on Guest kernel on CPU
2009 8 30

17. Intel-VT
2009 8 30

18. Intel-VT
Kernel Kernel
Mode Mode
Hypervirsor on Guest kernel on CPU
2009 8 30

19. Intel-VT
Guest OS
Kernel Kernel
Mode Mode
Hypervirsor on Guest kernel on CPU
2009 8 30

20. Intel-VT
CPU .
Kernel Kernel
Mode Mode
Hypervirsor on Guest kernel on CPU
2009 8 30

21. Intel-VT
VMX Root Mode
Kernel Kernel
Mode Mode
Hypervirsor on Guest kernel on CPU
2009 8 30

22. VMX Root Mode
VMXON
Kernel .
Mode
A20
VT
Hypervirsor on
2009 8 30

23. VMX Root Mode
VMXOFF
Kernel
Mode VT .
VT
Hypervirsor on
2009 8 30

24. Intel-VT
VMX non Root Mode
Kernel Kernel
Mode Mode
Hypervirsor on Guest kernel on CPU
2009 8 30

25. Intel-VT
VMX non Root Mode
Kernel Kernel
Mode Mode
VMEntry
Hypervirsor on Guest kernel on CPU
2009 8 30

26. VMEntry
VMLAUNCH
VMRESUME
VMX non Root Mode
2009 8 30

27. Intel-VT
VMExit
Kernel Kernel
Mode Mode
Hypervirsor on Guest kernel on CPU
2009 8 30

28. VMExit
VMMCALL
+
VMX non Root Mode
2009 8 30

29. • .
RDTSC ( )
•
VMCS
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30. VMCS
Kernel
Mode Memory
VMCS
Hypervirsor on
2009 8 30

31. VMCS
Virtual Machine Control Structure
4KB
2009 8 30

32. VMCS
•Virtual Machine Control Structure
•4KB
•
VM etc...
2009 8 30

33. VMCS
VMPTRST
Current VMCS
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34. VMPTRST
Kernel
Mode Memory
VMCS
VMCS
Hypervirsor on
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35. Current VMCS
VMPTRLD
Current VMCS
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36. VMPTRST
Kernel
Mode Memory
VMCS
Current VMCS
Hypervirsor on
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37. VMCLEAR
VMCS
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38. VMCLEAR
Kernel
Mode Memory
VMCS
Hypervirsor on
2009 8 30

39. VMCS
VMREAD/VMWRITE
2009 8 30

40. VMWRITE
Kernel
Mode Memory
VMCS
Hypervirsor on
2009 8 30

41. VMREAD
Kernel
Mode Memory
VMCS
Hypervirsor on
2009 8 30

42. Intel
( )
2009 8 30

43. KVM
2009 8 30

44. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
2009 8 30

45. 2009 8 30

46. VMX
VMX
NonRoot
Root Mode
Mode
2009 8 30

47. 2009 8 30

48. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
2009 8 30

49. VMX non Root Mode
2009 8 30

50. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
2009 8 30

51. User
Qemu
KVM Program
Qemu
Linux Guest
KVM
Kernel Kernel
2009 8 30

52. ./qemu -hda disk1.img
(-hda )
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53. User
Qemu
Program
$ ./qemu -hda disk1
Linux Guest
KVM
Kernel Kernel
2009 8 30

54. User
Qemu
Program
Qemu
Linux Guest
KVM
Kernel Kernel
2009 8 30

55. Qemu
2009 8 30

56. User
Qemu
Program
IOCTL
Linux Guest
KVM
Kernel Kernel
2009 8 30

57. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
2009 8 30

58. 2009 8 30

59. User
Qemu
Program
Linux Guest
KVM VT Kernel
Kernel
2009 8 30

60. VMX non Root Mode
2009 8 30

61. vmlaunch
vmresume
2009 8 30

62. User
Qemu
Program
vmlaunch / vmresume
Linux Guest
KVM
Kernel Kernel
2009 8 30

63. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
2009 8 30

64. VMX non root Mode
2009 8 30

65. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
2009 8 30

66. 2009 8 30

67. VMX non Root Mode
IO
2009 8 30

68. 2009 8 30

69. outb %ax
2009 8 30

70. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
2009 8 30

71. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
outb %ax
2009 8 30

72. VMX Root Mode
2009 8 30

73. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
2009 8 30

74. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
2009 8 30

75. 2009 8 30

76. Qemu
2009 8 30

77. User
Qemu
Program
IOCTL return
Linux Guest
KVM
Kernel Kernel
2009 8 30

78. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
2009 8 30

79. User
Qemu
Program
io
Linux Guest
KVM
Kernel Kernel
2009 8 30

80. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
2009 8 30

81. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
2009 8 30

82. 2009 8 30

83. IOCTL
CPU
2009 8 30

84. User
Qemu
Program
IOCTL
Linux Guest
KVM
Kernel Kernel
2009 8 30

85. 2009 8 30

86. ...
2009 8 30

87. User
Qemu
Program
IOCTL
Linux Guest
KVM
Kernel Kernel
vmlaunch
vmresume
2009 8 30

88. 2009 8 30

89. 2009 8 30

90. outb %ax
2009 8 30

91. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
2009 8 30

92. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
outb %ax
2009 8 30

93. VMX non Root Mode
IO
2009 8 30

94. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
2009 8 30

95. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
outb %ax
2009 8 30

96. 2009 8 30

97. "jne .Llaunched nt"
__ex(ASM_VMX_VMLAUNCH) "nt"
"jmp .Lkvm_vmx_return nt"
".Llaunched: " __ex(ASM_VMX_VMRESUME) "nt"
".Lkvm_vmx_return: "
vmlaunch
/* */ vmresume
...
...
2009 8 30

98. "jne .Llaunched nt"
__ex(ASM_VMX_VMLAUNCH) "nt"
"jmp .Lkvm_vmx_return nt"
".Llaunched: " __ex(ASM_VMX_VMRESUME) "nt"
".Lkvm_vmx_return: "
/* */
...
2009 8 30

99. 2009 8 30

100. 2009 8 30

101. out
2009 8 30

102. out
in .
2009 8 30

103. Intel-VT
2009 8 30

104. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
2009 8 30

105. 2009 8 30

106. Qemu
2009 8 30

107. User
Qemu
Program
IOCTL return
Linux Guest
KVM
Kernel Kernel
2009 8 30

108. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
2009 8 30

109. int kvm_cpu_exec(){
...
461 ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
478 switch (run->exit_reason) {
479 case KVM_EXIT_IO:
481 ret = kvm_handle_io(env, run->io.port,
482 (uint8_t *)run + run>io.data_offset,
483 run->io.direction,
484 run->io.size,
485 run->io.count);
486 break;
case KVM_EXIT_MMIO:
.... ...
2009 8 30

110. outb
2009 8 30

111. int kvm_cpu_exec(){
...
//
461 ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
478 switch (run->exit_reason) {
479 case KVM_EXIT_IO:
481 ret = kvm_handle_io(env, run->io.port,
482 (uint8_t *)run + run>io.data_offset,
483 run->io.direction,
484 run->io.size,
485 run->io.count);
486 break;
case KVM_EXIT_MMIO: outb
.... ...
2009 8 30

112. 2009 8 30

113. IO
2009 8 30

114. User
Qemu
Program
io
Linux Guest
KVM
Kernel Kernel
2009 8 30

115. 2009 8 30

116. out
2009 8 30

117. outb %al
2009 8 30

118. outb %al
2009 8 30

119. ( )
2009 8 30

120. int kvm_cpu_exec(){
...
//
461 ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
478 switch (run->exit_reason) {
479 case KVM_EXIT_IO:
481 ret = kvm_handle_io(env, run->io.port,
482 (uint8_t *)run + run>io.data_offset,
483 run->io.direction,
484 run->io.size,
485 run->io.count);
486 break;
case KVM_EXIT_MMIO:
.... ...
2009 8 30

121. kvm_handle_io
cpu_outb
ioport_write
2009 8 30

122. static void ioport_write(int index, uint32_t address, uint32_t data)
{
static IOPortWriteFunc *default_func[3] = {
default_ioport_writeb,
default_ioport_writew,
default_ioport_writel
};
IOPortWriteFunc *func = ioport_write_table[index][address];
if (!func)
func = default_func[index];
func(ioport_opaque[address], address, data);
}
ioport_write_table
2009 8 30

123. ( )
2009 8 30

124. User
Qemu
Program
io
Linux Guest
KVM
Kernel Kernel
2009 8 30

125. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
2009 8 30

126. User
Qemu
Program
Linux Guest
KVM
Kernel Kernel
2009 8 30

127. 2009 8 30

128. IOCTL
CPU
2009 8 30

129. 2009 8 30

130. 378 static int kvm_main_loop_cpu(CPUState *env)
379 {
394 while (1) {
395 while (!has_work(env))
396 kvm_main_loop_wait(env, 1000);
397 if (env->interrupt_request &
(CPU_INTERRUPT_HARD | CPU_INTERRUPT_NMI))
398 env->halted = 0; // .
....
404 }
405 if (!env->halted && !env->kvm_cpu_state.init) {
406 kvm_cpu_exec(env); //
}
}
413 }
2009 8 30

131. User
Qemu
Program
IOCTL
Linux Guest
KVM
Kernel Kernel
2009 8 30

132. 2009 8 30

133. ...
2009 8 30

134. User
Qemu
Program
IOCTL
Linux Guest
KVM
Kernel Kernel
vmlaunch
vmresume
2009 8 30

135. 2009 8 30

136. ?
2009 8 30