Avi Kivity wrote:
quoted text
> The instruction at 0x28 is enabling paging, next insn fetch faults, so 
> the paging structures must be incorrect.
> 
> Questions:
> - what is the u64 at cr3? (call it pte4)
> - what is the u64 at (pte4 & ~0xfff)?  (call it pte3)
> - what is the u64 at (pte3 & ~0xfff)? ("pte2")
> - what is the u64 at ((pte2 & ~0xfff) + 2048)? ("pte1")
> 
> Note if bit 7 of pte2 is set, then pte1 is unneeded.

Sorry for the delay. Here you go:

penberg@tiger:~/vm$ ./kvm bzImage
KVM exit reason: 8 ("KVM_EXIT_SHUTDOWN")
Registers:
  rip: 00000000001000ed   rsp: 00000000005d54b8 flags: 0000000000010046
  rax: 0000000080000001   rbx: 0000000001f2c000   rcx: 00000000c0000080
  rdx: 0000000000000000   rsi: 0000000000013670   rdi: 0000000002408000
  rbp: 0000000000100000   r8:  0000000000000000   r9:  0000000000000000
  r10: 0000000000000000   r11: 0000000000000000   r12: 0000000000000000
  r13: 0000000000000000   r14: 0000000000000000   r15: 0000000000000000
  cr0: 0000000080000011   cr2: 00000000001000ed   cr3: 0000000002402000
  cr4: 0000000000000020   cr8: 0000000000000000
Segment registers:
  register  selector  base              limit     type  p dpl db s l g avl
  cs        0010      0000000000000000  ffffffff  0b    1 0   1  1 0 1 0
  ss        0018      0000000000000000  ffffffff  03    1 0   1  1 0 1 0
  ds        0018      0000000000000000  ffffffff  03    1 0   1  1 0 1 0
  es        0018      0000000000000000  ffffffff  03    1 0   1  1 0 1 0
  fs        0018      0000000000000000  ffffffff  03    1 0   1  1 0 1 0
  gs        0018      0000000000000000  ffffffff  03    1 0   1  1 0 1 0
  tr        0020      0000000000001000  00000067  0b    1 0   0  0 0 0 0
  ldt       0000      0000000000000000  ffffffff  00    0 0   0  0 0 0 0
  gdt                 00000000005ca458  00000030
  idt                 0000000000000000  00000000
  [ efer: 0000000000000500  apic base: 0000000000000000  nmi: disabled ]
Interrupt bitmap:
  0000000000000000 0000000000000000 0000000000000000 0000000000000000
Code: 08 49 75 f3 8d 83 00 60 4d 00 0f 22 d8 b9 80 00 00 c0 0f 32 0f ba 
e8 08 0f 30 6a 10 8d 85 00 02 00 00 50 b8 01 00 00 80 0f 22 c0 <cb> f4 
eb fd 9c 6a 00 9d 9c 58 89 c3 35 00 00 20 00 50 9d 9c 58
Stack:
   0x005d54b8: 00 02 10 00  10 00 00 00
   0x005d54c0: 00 00 00 00  00 00 00 00
   0x005d54c8: 00 00 00 00  00 00 00 00
   0x005d54d0: 00 00 00 00  00 00 00 00
Page Tables:
  pte4: 0000000002403007   pte3: 0000000002404007   pte2: 0000000000000183
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