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Re: [Qemu-devel] Qemu deadlocks in tb_lock when using SVM+SoftMMU


From: Alex Bennée
Subject: Re: [Qemu-devel] Qemu deadlocks in tb_lock when using SVM+SoftMMU
Date: Mon, 06 Mar 2017 14:42:37 +0000
User-agent: mu4e 0.9.19; emacs 25.2.8

Alexander Boettcher <address@hidden> writes:

> Hi,
>
> On 06.03.2017 14:15, Alex Bennée wrote:
>> I found the virtualbox.iso on your branch but I can't trigger the
>> assert. Running:
>>
>> #!/bin/sh
>>
>> QEMU="$@"
>>
>> ${QEMU} -s -no-kvm -display sdl -m 512 -cpu phenom -nographic -cdrom 
>> virtualbox.iso
>>
>> I get:
>>
>> NOVA Microhypervisor v7-2436fe2 (x86_32): Feb 25 2017 17:58:48 [gcc 4.9.2]
>> [init -> log_terminal]
>> [init -> log_terminal] [ 0] CORE:0:0:0 10:2:3:0 [0] AMD Phenom(tm) 9550 
>> Quad-Core Processor
>> qemu: fatal: invalid tss type
>
>
>> Which is a guest error?
>
> It's a race which happens in Qemu (not on hardware), so I still
> investigating it within Qemu. Because of that on [0] the commit before
> the virtualbox.iso is one commit to avoid this for the moment in order
> to continue.

How can a single-threaded system emulation race with itself?

>
>>> [0] https://github.com/alex-ab/qemu/commits/genode_svm_issue
>
> Alex.


--
Alex Bennée



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