第二回KVM読書会

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

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

Intel-VT 2009 8 30

2009 8 30

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

x86 ( ) Ring3 = User Mode Ring2 Ring1 (0 ) Ring0 OS Ring 0 Kernel Mode Ring3 OS 2009 8 30

1. 2. 2009 8 30

Ring3 Ring0 Ring3 Ring2 Ring1 Ring0 Kernel Mode User Mode 2009 8 30

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

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

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

VM CPU etc... 2009 8 30

VM Kernel Kernel Mode Mode CPU 2009 8 30

? 2009 8 30

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

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

Intel-VT 2009 8 30

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

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

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

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

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

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

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

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

VMEntry VMLAUNCH VMRESUME VMX non Root Mode 2009 8 30

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

VMExit VMMCALL + VMX non Root Mode 2009 8 30

• . RDTSC ( ) • VMCS 2009 8 30

VMCS Kernel Mode Memory VMCS Hypervirsor on 2009 8 30

VMCS Virtual Machine Control Structure 4KB 2009 8 30

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

VMCS VMPTRST Current VMCS 2009 8 30

VMPTRST Kernel Mode Memory VMCS VMCS Hypervirsor on 2009 8 30

Current VMCS VMPTRLD Current VMCS 2009 8 30

VMPTRST Kernel Mode Memory VMCS Current VMCS Hypervirsor on 2009 8 30

VMCLEAR VMCS 2009 8 30

VMCLEAR Kernel Mode Memory VMCS Hypervirsor on 2009 8 30

VMCS VMREAD/VMWRITE 2009 8 30

VMWRITE Kernel Mode Memory VMCS Hypervirsor on 2009 8 30

VMREAD Kernel Mode Memory VMCS Hypervirsor on 2009 8 30

Intel ( ) 2009 8 30

KVM 2009 8 30

User Qemu Program Linux Guest KVM Kernel Kernel 2009 8 30

2009 8 30

VMX VMX NonRoot Root Mode Mode 2009 8 30

2009 8 30

VMX non Root Mode 2009 8 30

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

./qemu -hda disk1.img (-hda ) 2009 8 30

User Qemu Program $ ./qemu -hda disk1 Linux Guest KVM Kernel Kernel 2009 8 30

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

Qemu 2009 8 30

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

2009 8 30

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

VMX non Root Mode 2009 8 30

vmlaunch vmresume 2009 8 30

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

VMX non root Mode 2009 8 30

2009 8 30

VMX non Root Mode IO 2009 8 30

2009 8 30

outb %ax 2009 8 30

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

VMX Root Mode 2009 8 30

2009 8 30

Qemu 2009 8 30

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

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

2009 8 30

IOCTL CPU 2009 8 30

2009 8 30

... 2009 8 30

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

2009 8 30

outb %ax 2009 8 30

VMX non Root Mode IO 2009 8 30

2009 8 30

"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

"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

2009 8 30

out 2009 8 30

out in . 2009 8 30

Intel-VT 2009 8 30

2009 8 30

Qemu 2009 8 30

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

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

outb 2009 8 30

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

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IO 2009 8 30

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out 2009 8 30

outb %al 2009 8 30

( ) 2009 8 30

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

kvm_handle_io cpu_outb ioport_write 2009 8 30

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

( ) 2009 8 30

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IOCTL CPU 2009 8 30

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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

2009 8 30

... 2009 8 30

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

2009 8 30

? 2009 8 30

第二回KVM読書会

by Tsuyoshi Ozawa

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第二回KVM読書会 Presentation Transcript