AMD SVMってなあに
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(1) AMD SVM allows virtualization of AMD processors through virtualization of the processor state and controls. It uses a Virtual Machine Control Block (VMCB) to store and manage the guest and host state. (2) The VMCB contains a control area and save state area. The control area manages features like I/O permissions and controls VM exits. The save state area stores guest register state like RIP, RSP, and control register state. (3) Transition between host and guest mode uses the VMCB. VMLOAD loads the VMCB, VMRUN runs the guest, and VMSAVE saves state back to the VMCB on VM exits. Key state
, %%ebx nt" ※kvm-6
"mov %c[rcx](%[svm]), %%ecx nt"
"mov %c[rdx](%[svm]), %%edx nt"
"mov %c[rsi](%[svm]), %%esi nt"
"mov %c[rdi](%[svm]), %%edi nt"
"mov %c[rbp](%[svm]), %%ebp nt"
/* Enter guest mode */
"push %%eax nt"
"mov %c[vmcb](%[svm]), %%eax nt"
SVM_VMLOAD "nt"
SVM_VMRUN "nt"
SVM_VMSAVE "nt"
"pop %%eax nt"
/* Save guest registers, load host registers */
"mov %%ebx, %c[rbx](%[svm]) nt"
"mov %%ecx, %c[rcx](%[svm]) nt"
"mov %%edx, %c[rdx](%[svm]) nt"
"mov %%esi, %c[rsi](%[svm]) nt"
"mov %%edi, %c[rdi](%[svm]) nt"
"mov %%ebp, %c[rbp](%[svm]) nt"
mov ;)](https://image.slidesharecdn.com/amdsvm-090827133716-phpapp01/85/AMD-SVM-13-320.jpg)
, %%eax nt"
SVM_VMLOAD "nt"
SVM_VMRUN "nt"
SVM_VMSAVE "nt"
"pop %%eax nt"
VMRUN](https://image.slidesharecdn.com/amdsvm-090827133716-phpapp01/85/AMD-SVM-17-320.jpg)
AMD SVMってなあに
- 1. AMD SVM syuu1228 from @livedoor
- 3. SVM Ring Host/Guest Guest DMA Host/Guest Guest Guest Tagged TLB Nested Paging
- 4. Host Guest VMM ex:
- 5. Guest VMCB VMRUN Guest VMCB Guest Host ex: Host AMD #VMEXIT Host #VMEXIT VMRUN
- 6. Host Guest Guest VMRUN λ... #VMEXIT Host #VMEXIT VMRUN
- 7. VMCB Virtual Machine Control Block VM VMCB 4KB aligned 4KB 1 Control area Guest CPU Save state area
- 8. Control Area (1) on/off bit R/W , I/O MSR
- 9. Control Area (2) I/O Permissons Map IO MSR Permissons Map MSR Time stamp counter RDTSC, RDTSCP
- 10. Control Area (3) TLB , Guest ASID(TLB tag ) #VMEXIT Nested Paging Event Injection Guest LBR LBR Last Branch Record)AMD64
- 11. Save state area RIP,RSP,RAX ES,CS,SS,DS,FS,GS STAR,LSTAR,CSTAR GDTR,LDTR,IDTR SFMASK TR KernelGsBase CPL SYSENTER_CS,SYSENTER CR0,CR2,CR3,CR4 _ESP,SYSENTER_EIP DR6,DR7 PAT RFLAGS LBR registers RBX
- 12. … Save state area Guest (RBX,RCX,RDX,RSI,RDI,RBI) Host (!!!!)
- 13. … Guest "mov %c[rbx](%[svm]), %%ebx nt" ※kvm-6 "mov %c[rcx](%[svm]), %%ecx nt" "mov %c[rdx](%[svm]), %%edx nt" "mov %c[rsi](%[svm]), %%esi nt" "mov %c[rdi](%[svm]), %%edi nt" "mov %c[rbp](%[svm]), %%ebp nt" /* Enter guest mode */ "push %%eax nt" "mov %c[vmcb](%[svm]), %%eax nt" SVM_VMLOAD "nt" SVM_VMRUN "nt" SVM_VMSAVE "nt" "pop %%eax nt" /* Save guest registers, load host registers */ "mov %%ebx, %c[rbx](%[svm]) nt" "mov %%ecx, %c[rcx](%[svm]) nt" "mov %%edx, %c[rdx](%[svm]) nt" "mov %%esi, %c[rsi](%[svm]) nt" "mov %%edi, %c[rdi](%[svm]) nt" "mov %%ebp, %c[rbp](%[svm]) nt" mov ;)
- 14. Host __asm __volatile ( ※kvm-6 "push %%ebx; push %%ecx; push %%edx;" "push %%esi; push %%edi; push %%ebp;" "pop %%ebp; pop %%edi; pop %%esi;" "pop %%edx; pop %%ecx; pop %%ebx; nt" push/pop
- 16. SVM VM_HSAVE_PA on MSR SVM MSR Host VMRUN/#VMEXIT CS,SS,RIP,RSP,CR0,CR4,EFER,IDTR,GDTR
- 17. /* Enter guest mode */ ※kvm-6 "push %%eax nt" "mov %c[vmcb](%[svm]), %%eax nt" SVM_VMLOAD "nt" SVM_VMRUN "nt" SVM_VMSAVE "nt" "pop %%eax nt" VMRUN
- 18. VMLOAD/VMSAVE VMRUN/#VMEXIT CS,RIP,RFLAGS,RAX,SS,RSP,CR0,CR2-4,EFER,IDTR,GDTR,ES,DS,DR6-7,CPL →VMLOAD/VMSAVE FS,GS,TR,LDTR,KernelGsBase,STAR,LSTAR,CSTAR,SFMASK,SYSENTER_CS,SY SENTER_ESP,SYSENTER_EIP KVM VMLOAD→VMRUN→VMSAVE
- 19. Host Host Guest Guest VMLOAD) Host (VMRUN) Guest (VMRUN) Guest !!! Guest (#VMEXIT) Host (#VMEXIT) Guest (VMSAVE) Guest Host Host