[Bug 65561] New: KVM:Entry failed on Single stepping sti instruction

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=65561

            Bug ID: 65561
           Summary: KVM:Entry failed on Single stepping sti instruction
           Product: Virtualization
           Version: unspecified
    Kernel Version: 3.8.8
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: jatin.iitdelhi@gmail.com
        Regression: No

Hello, I am running a code in which I need to single step some section of code
running in a qemu(+kvm) emulated virtual machine with. The vm hangs everytime I
try to single step the sti instruction. Exact error message is:

KVM: entry failed, hardware error 0x80000021

If you're running a guest on an Intel machine without unrestricted mode
support, the failure can be most likely due to the guest entering an invalid
state for Intel VT. For example, the guest maybe running in big real mode
which is not supported on less recent Intel processors.

EAX=00000001 EBX=00000001 ECX=00000000 EDX=00000050
ESI=00000000 EDI=0000038f EBP=c000edc8 ESP=c000ed90
EIP=c0022f85 EFL=00000302 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0028 c0107000 00000067 00408b00 DPL=0 TSS32-busy
GDT=     c004ae20 0000002f
IDT=     c00495e0 000007ff
CR0=80010015 CR2=00000000 CR3=00101000 CR4=00000000
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000
DR3=0000000000000000 
DR6=00000000ffff4ff0 DR7=0000000000000400
EFER=0000000000000000
Code=44 24 04 65 00 00 00 c7 04 24 78 c9 03 c0 e8 78 fc 00 00 fb <8b> 45 f4 c9
c3 55 89 e5 83 ec 10 e8 6d ff ff ff 89 45 fc fa 8b 45 fc c9 c3 55 89 e5 83 ec

The problem is reproducible and I am hitting it everytime I try to run it.

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