linux-kernel - Re: [PATCH 13/20] KVM: x86 emulator: fix memory access during x86 emulation

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Date:	Mon, 08 Mar 2010 16:12:54 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Stefan Bader <stefan.bader@...onical.com>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 13/20] KVM: x86 emulator: fix memory access during x86
 emulation

On 03/08/2010 04:10 PM, Stefan Bader wrote:
> Avi Kivity wrote:
>    
>> On 03/06/2010 03:53 PM, Stefan Bader wrote:
>>      
>>> i Avi,
>>>
>>> we currently try to integrate this patch for an update into a 2.6.32
>>> based
>>> system (amongst other kvm updates). But as soon as this patch gets
>>> added kvm
>>> will die on startup in kvm_leave_lazy_mmu. This has been documented here:
>>>
>>> https://bugs.edge.launchpad.net/ubuntu/+source/linux/+bug/531823
>>>
>>> I have placed the backports of your patches, which are currently in
>>> linux-next
>>> and marked for stable here:
>>>
>>> git://kernel.ubuntu.com/smb/linux-2.6.32.y kvm
>>>
>>> I have tested the failure with a version that got only the following
>>> patches in:
>>> KVM: x86 emulator: Add Virtual-8086 mode of emulation
>>> KVM: x86 emulator: fix memory access during x86 emulation
>>> KVM: x86 emulator: Check IOPL level during io instruction emulation
>>> KVM: x86 emulator: Fix popf emulation
>>> KVM: x86 emulator: Check CPL level during privilege instruction emulation
>>>
>>> and also with a version that takes all stable patches up to the bad one:
>>> KVM: VMX: Trap and invalid MWAIT/MONITOR instruction
>>> KVM: x86 emulator: Add group8 instruction decoding
>>> KVM: x86 emulator: Add group9 instruction decoding
>>> KVM: x86 emulator: Add Virtual-8086 mode of emulation
>>> KVM: x86 emulator: fix memory access during x86 emulation
>>>
>>> But as soon as the fix for memory access gets added, the bug will
>>> occur. Would
>>> you have an idea what might be causing this?
>>>
>>>        
>> Does the same guest, using the same qemu-kvm, work on kvm.git or upstream?
>>
>>      
> The test was done with a kvm user-space package based on 0.12.3 (which seems to
> be the current upstream version). I try to do a test on the git version.
>    

I meant keep the same userspace without change, and try it on a Linus 
kernel or kvm.git master 
(http://git.kernel.org/?p=virt/kvm/kvm.git;a=summary).

-- 
error compiling committee.c: too many arguments to function

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