Re: Questions on the VMentry failure patch

[Anthony Liguori <anthony@codemonkey.ws>]

Avi Kivity wrote:
> Mohammed Gamal wrote:
>> On Mon, Jul 7, 2008 at 5:24 PM, Avi Kivity <avi@qumranet.com> wrote:
>>  
>>> Mohammed Gamal wrote:
>>>    
>>>> Hello,
>>>> Guillaume Thouvenin's VMentry failure detection patch was reverted
>>>> before because it broke guest rebooting. Although it turned out it
>>>> didn't, it was preferred not to re-include it because it was not
>>>> reliable enough. Although it is working fine with me, I want to know
>>>> why it wasn't re-included? Did it cause any regressions? Is it
>>>> preferrable to use an alternative mechanism to detect the VM entry
>>>> failure and start real-mode emulation? If yes, What do you think it
>>>> should be?
>>>>
>>>>
>>>>       
>>> Anthony Liguori reported problems with Ubuntu IIRC.  I'd like to 
>>> know that
>>> they are fixed, or what exactly the issue was.
>>>
>>>     
>> Well, Ubuntu and openSuSE live CDs used to crash occasionally after
>> booting, it didn't happen most of the time though. I've never
>> experienced this issue after kvm-70 - with the patches the patch
>> included of course. Did anyone have any issues with the patches
>> included?
>>   
>
> I think they're fine.  Can you check the vmentry patch now, with 
> Anthony's testcase?

If I revert 0eba1b, then use the following command line:

sudo qemu-system-x86_64 -hda ~/images/10gig.img -cdrom 
~/images/isos/ubuntu-7.10-server-amd64.iso -snapshot -boot dc

After about the 7th or so run, I get:

kvm_run: failed entry, reason 5
kvm_run returned -8

So the problem still exists.

Regards,

Anthony Liguori