On Nov 23, 2007 8:21 PM, Sheng Yang <[EMAIL PROTECTED]> wrote: > > On Saturday 24 November 2007 07:23:20 Neo Jia wrote: > > hi, > > > > I happened to get a "emulation fail" when running the following command: > > > > System environment: Intel Core 2 Duo (E6600) x86_64 Fedora 8 > > (2.6.23.1-49.fc8). > > > > qemu-img create -f qcow debian-testing.img 10G > > > > sudo qemu-system-x86_64 -cdrom > > /home/cjia/download/debian-testing-i386-netinst.iso -hda > > debian-testing.img -boot d -m 1024 > > > > Everything works fine until it prompts me that the installation is > > complete and need reboot. > > > > > sudo qemu-system-x86_64 -cdrom > > > /home/cjia/download/debian-testing-i386-netinst.iso -hda > > > debian-testing.img -boot d -m 1024 > > > > exception 13 (0) > > rax 0000000000000100 rbx 0000000000000100 rcx 000000000000ffff rdx > > 0000000000000600 > > rsi 0000000000000000 rdi 0000000000000000 rsp 0000000000000000 rbp > > 0000000000000000 > > r8 0000000000000000 r9 0000000000000000 r10 0000000000000000 r11 > > 0000000000000000 > > r12 0000000000000000 r13 0000000000000000 r14 0000000000000000 r15 > > 0000000000000000 > > rip 0000000000010000 rflags 00033003 > > cs f000 (000f0000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0) > > ds 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0) > > es 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0) > > ss 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0) > > fs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0) > > gs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0) > > tr 0080 (40c00000/00002088 p 1 dpl 0 db 0 s 0 type b l 0 g 0 avl 0) > > ldt 0000 (00000000/0000ffff p 1 dpl 0 db 0 s 0 type 2 l 0 g 0 avl 0) > > gdt 0/ffff > > idt 0/ffff > > cr0 60000010 cr2 0 cr3 0 cr4 0 cr8 0 efer 0 > > code: 00 00 00 00 ea 5b e0 00 f0 31 30 2f 32 38 2f 30 37 00 fc f5 --> > > fc 0f 01 15 92 a0 31 00 b8 18 00 00 00 8e d8 8e c0 8e e0 8e e8 31 c0 > > bf 00 30 39 00 b9 7c > > Aborted > > > > ---> dmesg: > > > > kvm: emulating exchange as write > > emulation failed but !mmio_needed? rip 10000 fc 0f 01 15 // I > > searched through the source code but not find a place to generate "but > > !mmio_needed?" string ... > > It due to one instruction haven't been emulated: 0xfc(one byte instruction). > Look it up in SDM Vol.2B's opcode map, you can find that's "CLD". And look at > what is CLD in SDM Vol.2, you will find "CLD - Clear direction flag". So we > miss this in x86_emulate.c.
Could you show me how to decode the log message "rip 10000 fc 0f 01 15". How can you determine that it is a one byte instruction? Thanks, Neo > > > > > The version of kvm I used for kvm module is > > "694401697ccd822bb08019731c3ee1bb34323d8e" and the kvm-userspace is > > "a57b838b49bc4e4e7439b18d0323385d53e41c7f". > > // Not sure if this is the right way to show the version I am using. > > If not, please correct me, this is the first time I am using git... > > Yeah, that's the right ones. :) > > > > > Anyway, I really want to get some comments about how to trace this > > problem and would be very glad to dig into it! > > Here is the chance! Add this instruction to our x86 emulator. You can take the > implement of "sti" and "cli" as a reference. > > Good luck! > > > > > Thanks, > > Neo > > > > -- > Thanks > Yang, Sheng > -- I would remember that if researchers were not ambitious probably today we haven't the technology we are using! ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
