Il 19/09/2013 19:18, Andriy Gapon ha scritto: > on 19/09/2013 19:53 Paolo Bonzini said the following: >> 1) Can you try loading the kvm_intel module with >> emulate_invalid_guest_state=0? > > Will do. > >> 2) What are the contents of fs and gs? Why are they not zeroed? >> Perhaps that is causing invalid guest state emulation to run, and then >> something is triggering a bug in emulate_invalid_guest_state itself. > > I will try to find this out. > >> 3) What is at 0x9315? > > This I can answer immediately. It looks like this address even gets executed > earlier: > qemu-system-x86-12024 [002] 278153.809990: kvm_emulate_insn: 0:9315:ea 1a > 93 00 00 (real) > qemu-system-x86-12024 [002] 278153.809991: kvm_entry: vcpu 0 > qemu-system-x86-12024 [002] 278153.809992: kvm_emulate_insn: 0:931a:31 c0 > (real) > > I guess it's a jump to 931a.
Yes, it is. > Puzzling that later it becomes a jump to self. I don't think that's what happens. It's more likely that for some reason the emulator mis-parses the instruction. Please confirm with "info cpus" that QEMU is looping there (just in case), and attach the output of "info registers" (you can use "-monitor stdio" to do this and to answer question 2 from my previous email). Paolo
