Description of problem:
--------------------------
I recently run kvm unit test (using run_tests.sh with default unittests.cfg) with upstream qemu on latest RHEL6.5 host, there are 3 cases get stuck, 2 cases fail.

I am not sure whether this is a kvm bug, or kvm unit test problem, or i run kvm unit test wrong, i only modify run_test.sh and x86_run script a little bit to separate log file for each case, and i use upstream qemu for i was told in RHEL6 testdev device in our internal version may not guarantee to work, so feel free to change the component or close if this is notabug.

BTW, the "-display none" command does not exists, i have to remove it from script or it shows all cases pass but don't run them at all.


Version-Release number of selected component (if applicable):
--------------------------------------------------------------
kernel 2.6.32-421.el6.x86_64
qemu: latest upstream
kvm unit test: latest upstream

host:

vendor_id	: GenuineIntel
cpu family	: 6
model		: 23
model name	: Intel(R) Core(TM)2 Quad CPU    Q9500  @ 2.83GHz




This bug is to track the "realmode" case, which gets stuck, i have to kill the qemu process, log:

qemu-system-x86_64 -enable-kvm -device testdev,chardev=testlog -chardev file,id=testlog,path=msr.out -serial stdio -kernel x86/realmode.flat -smp 1
VNC server running on `::1:5900'
PASS: null
PASS: shld
PASS: push/pop 1
PASS: push/pop 2
PASS: push/pop 3
PASS: push/pop 4
PASS: push/pop 5
PASS: push/pop 6
PASS: push/pop with high bits set in %esp
PASS: pusha/popa 1
PASS: pusha/popa 1
PASS: mov 1
PASS: mov 2
PASS: mov 3
PASS: mov 4
PASS: mov 5
PASS: cmp 1
PASS: cmp 2
PASS: cmp 3
PASS: add 1
PASS: add 2
PASS: sub 1
PASS: sub 2
PASS: sub 3
PASS: sub 4
PASS: xor 1
PASS: xor 2
PASS: xor 3
PASS: xor 4
PASS: pio 1
PASS: pio 2
PASS: pio 3
PASS: pio 4
PASS: pio 5
PASS: pio 6
PASS: clc 
PASS: stc 
PASS: cli 
PASS: sti 
PASS: cld 
PASS: std 
PASS: jnz short 1
PASS: jnz short 2
PASS: jmp short 1
PASS: jnz near 1
PASS: jnz near 2
PASS: jmp near 1
PASS: call 1
PASS: call near 1
PASS: call near 2
PASS: call far 1
PASS: call far 2
PASS: ret imm 1
PASS: retf imm 1
PASS: jmp far 1
PASS: xchg 1
PASS: xchg 2
PASS: xchg 3
PASS: xchg 4
PASS: xchg 5
PASS: xchg 6
PASS: xchg 7
PASS: xchg 8
PASS: iret 1
PASS: iret 2
PASS: iret 3
PASS: iret 4
PASS: int 1
PASS: imul 1
PASS: imul 2
PASS: imul 3
PASS: imul 4
PASS: imul 5
PASS: imul 6
PASS: mul 1
PASS: mul 2
PASS: mul 3
PASS: div 1
PASS: div 2
PASS: div 3
PASS: idiv 1
PASS: idiv 2
PASS: idiv 3
PASS: LOOPcc short 1
PASS: LOOPcc short 2
PASS: LOOPcc short 3
PASS: cbq 1
PASS: cwde 1
PASS: cwd 1
PASS: cwd 2
PASS: cdq 1
PASS: cdq 2
PASS: DAS
PASS: lds
PASS: les
PASS: lfs
PASS: lgs
PASS: lss
PASS: jcxz short 1
PASS: jcxz short 2
PASS: jcxz short 3
PASS: jecxz short 1
PASS: jecxz short 2
PASS: cpuid
PASS: ss relative addressing (1)
PASS: ss relative addressing (2)
FAIL: sgdt
FAIL: sidt
PASS: lahf
PASS: movsx
PASS: movzx
PASS: movsx ah
PASS: movzx ah
PASS: bswap
PASS: aad
PASS: aam
PASS: xlat
PASS: salc (1)
PASS: salc (2)
PASS: fninit
PASS: nopl
Return value from qemu: 137