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Created attachment 638334 [details] snapshot Description of problem: Win2012 hangs when booting with -cpu SandyBridge,vendor=AuthenticAMD Error code: 0x000000C4 Version-Release number of selected component (if applicable): qemu-kvm-0.12.1.2-2.331.el6.x86_64 How reproducible: 100% Steps to Reproduce: 1. boot Win2012 w/ -cpu SandyBridge,vendor=AuthenticAMD 2. 3. Actual results: guest hang at booting, see snapshot Expected results: guest booting without error Additional info: 1) Same cmd works for Win2008r2 2) registers info after guest hang (qemu) info registers RAX=0000000000000002 RBX=0000000000000000 RCX=0000000000000000 RDX=fffffffffe6f7130 RSI=fffff802e6efc2a0 RDI=ffffffff80000003 RBP=fffff802e88050f0 RSP=fffff802e8804fe8 R8 =0000000000000000 R9 =0000000000000000 R10=fffff802e6efc2a0 R11=fffff802e6c06000 R12=000000000000001e R13=0000000000000000 R14=0000000000000000 R15=fffff802e6c7b930 RIP=fffff802e6d7d738 RFL=00000046 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=0 ES =002b 0000000000000000 ffffffff 00c0f300 DPL=3 DS [-WA] CS =0010 0000000000000000 00000000 00209b00 DPL=0 CS64 [-RA] SS =0000 0000000000000000 ffffffff 00000000 DS =002b 0000000000000000 ffffffff 00c0f300 DPL=3 DS [-WA] FS =0053 0000000000000000 00003c00 0040f300 DPL=3 DS [-WA] GS =002b fffff802e6efc000 ffffffff 00c0f300 DPL=3 DS [-WA] LDT=0000 0000000000000000 000fffff 00000000 TR =0040 fffff802e8803080 00000067 00008b00 DPL=0 TSS64-busy GDT= fffff802e8802000 0000007f IDT= fffff802e8802080 00000fff CR0=80050031 CR2=0000000000000000 CR3=0000000000187000 CR4=000006a0 DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 DR6=00000000ffff0ff0 DR7=0000000000000400 FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80 FPR0=0000000000000000 0000 FPR1=0000000000000000 0000 FPR2=0000000000000000 0000 FPR3=0000000000000000 0000 FPR4=0000000000000000 0000 FPR5=0000000000000000 0000 FPR6=0000000000000000 0000 FPR7=0000000000000000 0000 XMM00=00000000000000000000000000000000 XMM01=00000000000000000000000000000000 XMM02=00000000000000000000000000000000 XMM03=00000000000000000000000000000000 XMM04=00000000000000000000000000000000 XMM05=898355ab15aed18611e2245fc4eca52f XMM06=00000000000000000000000000000000 XMM07=00000000000000000000000000000000 XMM08=00000000000000000000000000000000 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000 (qemu)