On Saturday 20 June 2009 03:23:40 Ram Pai wrote: > I see this problem with a x86 sles10 guest running on x86_64 intel host. > If the guest is reset abruptly and rebooted, some where > before grub sequence it hangs and the following message is seen in the > logs > > emulation failed (pagetable) rip 7ed5 66 60 ac 20. > > I located this instruction sequence in isolinux.bin on the iso ;if that > is relevant. > > > I did some analysis and find that there is an ept violation, which is > handled and then the next instruction '66 60' is attempted to decode > and emulate. But decode fails. kvm continues loops in the kernel > in __vcpu_run(). > > the code path is > > kvm_run() -> __vcpu_run() -> vcpu_enter_guest() -> kvm_handle_exit() -> > handle_ept_violation() -> kvm_mmu_page_fault() -> emulate_instruction() -> > x86_decode_insn() > Hi Ram Seems KVM failed to emulate a unknown instruction. 00000000 6660 pushad 00000002 AC lodsb And PUSHAD have not implemented in x86_emulate.c. But I am a little curious about why this code path was only triggered when reset. Maybe other issue exists. -- regards Yang, Sheng > > Any insights here on how to fix the problem is appreciated. And if a fix > already exists even better :) > > thanks, > RP > > -- > 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 -- 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
