Re: kernel bug in kvm_intel

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 10/13/2009 11:04 PM, Andrew Theurer wrote:

Look at the address where vmx_vcpu_run starts, add 0x26d, and show the
surrounding code.

Thinking about it, it probably _is_ what you showed, due to module page
alignment.  But please verify this; I can't reconcile the fault address
(ffffffff9fe9a2b) with %rsp at the time of the fault.
Here is the start of the function:

0000000000003884<vmx_vcpu_run>:
     3884:       55                      push   %rbp
     3885:       48 89 e5                mov    %rsp,%rbp
and 0x26d later is 0x3af1:

     3ad2:       4c 8b b1 88 01 00 00    mov    0x188(%rcx),%r14
     3ad9:       4c 8b b9 90 01 00 00    mov    0x190(%rcx),%r15
     3ae0:       48 8b 89 20 01 00 00    mov    0x120(%rcx),%rcx
     3ae7:       75 05                   jne    3aee<vmx_vcpu_run+0x26a>
     3ae9:       0f 01 c2                vmlaunch
     3aec:       eb 03                   jmp    3af1<vmx_vcpu_run+0x26d>
     3aee:       0f 01 c3                vmresume
     3af1:       48 87 0c 24             xchg   %rcx,(%rsp)
     3af5:       48 89 81 18 01 00 00    mov    %rax,0x118(%rcx)
     3afc:       48 89 99 30 01 00 00    mov    %rbx,0x130(%rcx)
     3b03:       ff 34 24                pushq  (%rsp)
     3b06:       8f 81 20 01 00 00       popq   0x120(%rcx)


Ok. So it faults on the xchg instruction, rsp is ffff8806369ffc80 but the fault address is ffffffff9fe9a2b4. So it looks like the IDT is corrupted.

Can you check what's around ffffffff9fe9a2b4 in System.map?

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux