Re: [Xen-devel] VMX status report. Xen: #17702 & Xen0: #559 -- nonew issue

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

Okay, I have failed to repro this issue, but my test machine does not have
4G of memory, so I created a low-memory/high-memory split by placing the
start of the MMIO 'hole' at 256MB rather than the usual 3.75GB. Doing this,
for a 512MB Linux guest, did not cause the guest to crash. So I guess either
you really do need to give the guest >4GB of RAM (i.e., it's not a
split-across-the-MMIO-hole bug) and/or it's related to usage of EPT?

At least it looks like this one is not *my* bug. :-)

 -- Keir

On 23/5/08 09:37, "Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx> wrote:

> Hi, Keir, 
>     I think the problem may be not in the tools side, but in the shadow side.
> I ever removed the shadow 2MB superpage support code in p2m.c, and the Linux
> guest (hap=0, using shadow) can boot successful with more than 4G memory.
> 
> Thanks!
> -- Dongxiao
> 
> -----Original Message-----
> From: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx]
> Sent: 2008年5月23日 16:26
> To: Xu, Dongxiao; Li, Haicheng; xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] VMX status report. Xen: #17702 & Xen0: #559 -- nonew
> issue
> 
> That means I broke memory allocation when I cleaned up the tools side of
> that patch. I will look into it and fix it.
> 
>  -- Keir
> 
> On 23/5/08 09:06, "Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx> wrote:
> 
>> Hi, Keir, 
>>     This issue is caused by the 2MB superpage patch in Xen C/S 17645. It
>> seems
>> that any linux guest (hap=0, using shadow) with more than 4G memory will fail
>> to boot (4095M memory can boot successful). I haven't tried EPT guest.
>> 
>> -- Dongxiao
>> 
>> -----Original Message-----
>> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
>> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Keir Fraser
>> Sent: 2008年5月23日 15:54
>> To: Li, Haicheng; xen-devel@xxxxxxxxxxxxxxxxxxx
>> Subject: Re: [Xen-devel] VMX status report. Xen: #17702 & Xen0: #559 -- nonew
>> issue
>> 
>> On 23/5/08 07:12, "Li, Haicheng" <haicheng.li@xxxxxxxxx> wrote:
>> 
>>> Old issues:
>>> ==============================================
>>> 1. linux guest kernel panic when booting up with 4G memory.
>>> http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1255
>> 
>> Can you provide more info on this one? Linux version, configuration, etc?
>> And/or send me the vmlinux/bzImage files privately to try to repro.
>> 
>>  -- Keir
>> 
>> 
>> 
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-devel
> 
> 



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