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Re: [Qemu-devel] in_asm substitute for accel=kvm:tcg
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] in_asm substitute for accel=kvm:tcg |
Date: |
Thu, 19 Sep 2013 19:26:09 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130805 Thunderbird/17.0.8 |
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
- [Qemu-devel] in_asm substitute for accel=kvm:tcg, Andriy Gapon, 2013/09/17
- Re: [Qemu-devel] in_asm substitute for accel=kvm:tcg, Andreas Färber, 2013/09/17
- Re: [Qemu-devel] in_asm substitute for accel=kvm:tcg, Andriy Gapon, 2013/09/17
- Re: [Qemu-devel] in_asm substitute for accel=kvm:tcg, Gleb Natapov, 2013/09/17
- Re: [Qemu-devel] in_asm substitute for accel=kvm:tcg, Andriy Gapon, 2013/09/19
- Re: [Qemu-devel] in_asm substitute for accel=kvm:tcg, Paolo Bonzini, 2013/09/19
- Re: [Qemu-devel] in_asm substitute for accel=kvm:tcg, Andriy Gapon, 2013/09/19
- Re: [Qemu-devel] in_asm substitute for accel=kvm:tcg,
Paolo Bonzini <=
- Re: [Qemu-devel] in_asm substitute for accel=kvm:tcg, Andriy Gapon, 2013/09/19
- Re: [Qemu-devel] in_asm substitute for accel=kvm:tcg, Andriy Gapon, 2013/09/19
- Re: [Qemu-devel] in_asm substitute for accel=kvm:tcg, Gleb Natapov, 2013/09/22
- Re: [Qemu-devel] in_asm substitute for accel=kvm:tcg, Andriy Gapon, 2013/09/22
- Re: [Qemu-devel] in_asm substitute for accel=kvm:tcg, Gleb Natapov, 2013/09/22
- Re: [Qemu-devel] in_asm substitute for accel=kvm:tcg, Andriy Gapon, 2013/09/22